No Parts Required Rich Running Chevy Truck

getting back on the Chevrolet folks uh 56 a couple Fords feel kind of weird 2012 folks 2012 Chevrolet uh that's a Silverado probably the big five three and the guy says he's got some engine light kind of comes and goes I guess that's what I'm told but he says it runs very poorly in the morning or so he thinks it runs worse in the morning then the rest of time when he drives it and evidently coming here to drop the thing off it uh you know turn the engine light off but this is the problem he's been having the engine light coming and going here let's see what the survey says so I left it sit outside it just Auto vend here we'll put her in here let it get uh loaded up we don't want to miss anything important on a cold start see turn our heater off service TPMS 151k on it 151 so she just about done in the Chevrolet World anyways at least here in the PRN manual transfer case it is not it is without trailer brake controller under 8600 with vehicle stability d95 without um yeah usually these old Chevys you get to drive them right to the junkyard unfortunately frames usually break in half on them right about this year let's see we've got automatic HVAC Here Comes Mrs oh what's up Josh too approach that for yourself yeah oh certainly let's see so I'm wondering what codes we're gonna have I'd guess evap but that's not going to make a car run rough you know typically unless the purge is just stuck wide open but so we're gonna hop into ECM We're not gonna do a full system scan just at the moment we're not anyways we're almost there current codes oh wow po101 mass airflow performance low voltage and a O2 sensor bank one one fuel system Rich Bank One fuel spring to make two and your classic General Motors 446 evap vent performance okay pretty interesting well let me get you guys where you can see where we can all see hopefully we'll set this up here and see if we can zoom in and we'll get some preliminary data and see what we can do I'm hoping that's good enough for you let's just go into our field trims I think we're going to have a couple issues with the old Chevy here oh boy so our long term right here we can see it's minus 25 so that's pretty bad I'm surprised we said his engine light turned off uh let's look at Loop status we're going to want to watch uh Point temp of course about 50 degrees outside right now we want mass airflow I don't know if we have fuel tank pressure in here oh here's your problem lady right there all right well we know what's wrong with this which is this right here it's an alcoholic she's been drinking a little um around here you cannot get E85 this guy lives around here so we don't have ethanol fuel and he's a he's a local so before we do anything let's just fix our Rich problem we'll do fuel composition reset um let's see here right is that what we're looking for we're gonna reset that we're back to three percent now we're going to back back out of here we're gonna go to um we're just going to reset our field trims that looks like they already are because we did a composition reset so let's go to live data let's go back where we were it still has our pit selected let's go ahead and start it and let's just see where our field trims end up see what's going on if there's anything funky with the mass airflow there may not be because our our elkhawk counter was off so uh ethanol is good it's it's good to use um it's super duper clean however instead of burning a stoichiometric of 14.7 to one it burns at like 9.8 I can't remember the ratio we're going to say almost 10 to 1 9.875 I think it is something like that um so if the engine is burning regular gasoline will cause a pump gas so E10 but it thinks it's alcohol it's going to pour the coal rate to it and make it super rich all right so we're in closed loop and we can see our short-term field trim is looking good so that fixed our rich condition our mass airflow must be reporting correctly it's cold right now it looks like it's over reporting a little bit but our I don't have RPMs in here but they're still up a little all right so let's go um let's do this let's pop into generic OBD2 see what uh what code's returning on the mill I can do it in the OEM side but sometimes it's easier just to pop in here you know were we just dealing with the where the other codes history codes or or what let's see so three coats found oops yeah well look at that with the drive cycle complete let me just see drive cycle is complete we have no monitors incomplete I'll grab our codes okay I've seen these two together so our rich bencoin rich Bank two uh being caused by alcohol content being far too far off I don't think that'll set a 101 though so let's just have a look again at our mass airflow data everything's turned off all engine loads are off so maybe this is EVAP code must have been just an old history code because it wasn't pending or active on the generic side uh let's see here so it still appears to be reporting a little bit High what we're looking for is uh the grams per second is approximately engine displacement at idle so I know I need GM's uh it does run a little high so I would expect to see this around six grams per second with the engine warmed up at idle no load no AC no nothing so being that the engine's still cold we're going to let this thing warm up I'm gonna take it for a rep because we can see it's it's coming down as engine loads being reduced as it's warming up and we'll see where it studies out we're going to graph it we're going to go give it some Full Throttle we'll set our our graph here we'll go out give her some beans I guess you guys can ride right there if you don't mind I don't know if you'll stay there or not but we'll give it a try and then what we'll do is we'll see where the mass airflow is steadying out as long as it looks good and steady we'll uh you know we'll give a visual inspection on it make sure it's not a mouse living in the air filter because that's a possibility you guys probably want to see where we're going make you nervous hold on here there you go tough guy's arm around you I don't want you falling over back there that's what she's ready to ball here we go if I have coaster nothing coming Chevy Thunder looks good and steady I don't see any weird dropouts in it fall back on the road there fella I don't feel that torque yeah she looks pretty good boys let's go back just do a visual inspection so pretty common on these shitties to have your fuel alcohol content way off especially if you've been at the bar all night you don't want to be driving around at 75 percent let's see I believe GM has a bulletin on these two at TSB you can share with your customer it talks about the importance of refueling and not getting you know 5-10 gallons at a time or five or ten dollars worth of time you know a couple gallons at a time because it looks for a refueling event and then it checks um O2 sensor switch rates to determine alcohol content I mean it's way more complicated than that but that's that's a long story short as they say yeah we should be about warmed up now let's pull up here and have a look there's Luna the kitty oh he's got a headlight out too all right so just as I suspected we're doing pretty good so we're at 5.8 I expected to see it around six grams per second in my experience Tustin Chevrolets oddly enough these LS engines being a pushrod V8 so you know old technology they're very efficient in airflow so an engine is nothing more than an air pump and typically a overhead valve push rod V8 are not very efficient um you know when you're talking volumetric efficiency they're usually in the you know 80 percentile now some of these GMS will run in the upper 90s which is pretty bizarre for a pushrod motor we can see yeah we're holding you know six and a half now let's go check uh let's check our fuel trims just to see where we're at we should be all good now our long term should have populated I'm going to show all and we're going to go to fuel and we want short term long terms on every Bank and it's still reporting uh just a scotch on the on the rich side here so that's pretty interesting let's have a look-see at our mass airflow like I say it appears to be reporting about where it is I'm curious though how long he's been driving this with of the alcohol content off because we could be pulling all of this out of the crank case does that make sense let's see the oil change is due let's see when it's oil changes do here 157 according to the sticker it's got 151 on it so six six thousand miles do it 150 what kind of oils are you running where he's getting six thousand miles just says 5 30. huh let's go have a little sniff with our sniffer see if the oil smells like gasoline oh my God Josh is in here working let me tell you what so we're not bugging him let's just do this we'll be outside mechanics today oh yeah it should be thunder and this is a big 5.3 I'm gonna go get a rag if you don't smell too stinky I smelled stinkier because that is always a concerned when it engine's running that rich you know where it's just pouring the core rate to it but it must have just had changed because it's pretty clean and it's full and these things love burning oil Let's uh pop our mass airflow out have a look in here kind of visual inspection see if we see anything funky just got me a brand new can yesterday as a matter of fact my first can I've had that was probably several years old mainly finally ran out stuff lasts forever foreign so we're going to take this little guy right off oh and she's filthy you're filthy let me let me set these screws down here because I'm going to send them flying if I don't have a little look oh man I think it's dark as a pocket so this side of the fine wires are nice and clean you probably can't see them on there but we flip this thing over and it's like carbon black on this side and it goes in like this so the clean side facing the engine the dirty side is facing the air filter but they're quite filthy the hot wires on here are so that's pretty simple we just need to clean the mass airflow in that regards but it's kind of interesting because it seems to be reporting pretty well pretty well where I would expect it anyway unless I'm way off but which I've been way off before now we're going to take a look at the air filter I can't fathom the surf filter dirty being that it has an Express Lube sticker on it [Music] that they like to upsell what's up Miss though The Odyssey yes ma'am got dropped off early because um it wasn't running well imagine that [Music] it's only got like 400 000 miles well you might want to check that out before we do a timing belt oh yeah you think yeah we're just we're doing it outside in the field repair oh yeah we're in the field is that you're working on the Ford yeah take a break from Forge working on Chevy yeah bread and butter that's right put your kids are coming through here boy everything breaks mostly Chevy so come on I got a whole Chevy hate theme going on how many cameras you got in this parking lot let's see one two yeah got a couple you got two how many Dodges let's see one two that's right yeah see I told you it'd be brand new Express Lube Never Let You Down everyone every time oh yeah let's see here's the piece of the box that's broken right here stuck on this screw which is supposed to be on that screw that was down low that I just dropped and I gotta find but we're out here in the field so I'm gonna get this put back together folks I'll show you how I cleaned the mass airflow with CRC mass airflow cleaner not a spot for the Shelf but it works pretty well let's be honest so it doesn't break things all right hour later I found my screw not quite that long but I ended up falling like back in this corner even though it was the bottom screw and it sounded like it went that way I found it we had to do a little fishing now because mother figure you know what my last freaking can I tell you what don't buy this CRC crap this thing pisses me off my last can leaked all around the top look at this here let me show you something this is not this guy a brand new can I literally just opened it when you squeeze it down came back though the liner up we give her a squeeze it freaking all comes out of the top and then you can dump it out you know it's dripping back here if you it just right they're just all kind of comes out and freaking runs down your hand there's enough to piss guy off but we're not gonna get pissed off this morning we're going to spray a little bit on our Q-tip my last can did that I'm gonna show you that this is dirty I'm in a very gingerly reach in here clean the fine wire and then I can show you the tip of the tip tip of the Q-tip you see how that's got the black spot on it and I'll show you that black spot was around there I'll put a little bit of cleaner on this one we'll reach down here give the bottom one a little clean I did hit the air temp sensor when it's in there but you can see see it's filthy you're filthy [Music] this is why we don't have sponsors folks we can type CRC cans crap cleaner works pretty well can't say I've ever had an issue with it but you got to be careful going in there with your Q-tip I just do it to get the thick sludge off but you stick a little piece of hair on there like I did there we go I got it from your Q-tip then you're in worse shape than you were so now we give it a full douche and according to this we're looking at uh up to 10 hp's so I give it a full douche like that and Shake It Off the can makes me want to just Chuck that thing that'd be a fun video and everybody be like you have anger issues we're gonna send that right back to crappa right where we got it from we're gonna make Napper get us a new can because we ain't doing that again for another year I was looking forward to getting rid of the other can oh well that's worse that happens to me all day I think we're in good shape we're gonna stick our bolts back in here or screws there's one there's two and then we're gonna take and drive it again and we're gonna see where our fuel trim number is steady out I'm not going to clear them we're just gonna drive it yeah what you guys think about videos like these um which is kind of some scan tool stuff you know the boring parts of the job I guess if you're into like nuts and bolts things I guess so we drive the vehicle so it goes through all the different cell blocks you know because each of course that's associated RPM and everything it goes through different cell blocks and starts to calculate your your long-term and short-term back in the old days your adapted numerator I guess it would be we're going way back in the TF days when we're talking about that so we're going to go through and just let the ECM populate each one of those cell blocks and start to learn its fuel trim just through various types of driving and then we're going to see what we end up with total trim so that's why you'll see like if you're watching the field trip numbers constantly changing your long term like you could give it some beans and then all of a sudden your long term will change foreign make a liar out of me it doesn't but you'll see like a rapid change where it'll hit some big negative numbers and big positive numbers that were stored in there from the previous uh trip you know previously in that cell block in its memory knew that at this engine load the field trim was you know whatever it was and now all of a sudden it hits that cell block again and action sensor you know it's a feedback system so it's saying no not today and then the short term makes a quick correction stores it back in its memory so it knows when we come back into that cell block again that you know uh that's where it's at probably none of that just made any bit of sense to you but that's okay in my mind it does so I just pulled over and I was just looking at our field trim data at idle which appears to be the worst that's where it gets the creeps a little bit above 10 like I said we'll go back and pop the PCB system off because I'm not so sure that that's all coming from Purge but I was kind of confused I was looking down here our long-term average without Purge like one zero to twos I'm like ah so this isn't a percentage this is Lambda ding dong I wasn't thinking so uh short-term test you know obviously we're very close Lambda being one and here we're making what a 10 12 correction long-term test so minus 12 or minus 11 I guess we're at right now but um I don't know how often it populates that yeah because that's that's reading in Lambda in our Lambda right now is commanded at one okay but I'm yeah I'm super happy with this I mean I've these things will run all day long with a negative 10 field trip without having any you know any issues you know plus or minus 10 is always a general rule but I tell you what when you're working on uh GMS with GDI Purge is a huge influencer in field trip data so I think we're gonna be more than happy here I unhooked the PCV hose back there for hooks the valve cover put a plug in it and then where the manifold draws the fresh air from this side I unhook that hose and then just stuck a uh stuck a rubber plug there in the air intake so we'll give that a second to steady out and that'll tell us if the remaining fuel trim values are just because of crankcase gases which is what I'm assuming oh look at that so here at an idle now we are almost perfectly at zero which is 100 ideal so you guys can see that there so that's running as good as it can get folks so that tells me when it goes to the negative 10 or negative 11 where it was that's all because of you know unburned fuel in the crank case from running rich you know running rich with alcohol even though the oil just got changed um there still must be drawing some Vapors if that makes sense to you so that's the fastest way to tell there I think we've done a video on this before on the GDI it's a very very common video or a common problem on these let me set you down so on the gdis the fuel pump is inside the engine you know runs off the cam like most of them do all that I know do and um what that does there we go make sure we got that thing clicked on it puts gas you know directly fills over the crankcase directly filled up the crankcase with gas and then pulls it through the PCB system so now that that's hooked back up we'll fire it up and we'll watch our fuel trim over there after it steadies out we'll give it a second and there we are with the PCB hooked back up we're running around negative 10 again so again not not horrible by any stretch of the imagination so good blocks here if so blacks so nothing I get too excited about and there we have it I guess we just have to clear coats now um let me go back and make sure that was all we had I'm pretty sure it was the EVAP code that was in there and the um oxygen sensor code where most apparently have been where old history codes let me just double check I think that was awesome mass airflow we fixed fuel trims we fixed the vet performance appears to be working you know the canister vent valve and then clearly uh our O2 sensor is working as it should otherwise our field trims would be kind of wonky so we're gonna hit erase and I'm going to give it back to the fella obviously it needs a headlight bulb it needs uh you know it could benefit from an oil change but not 100 necessary you must only have about a thousand miles on it it must be the Express Lube I don't know how many miles they put on they're thicker usually on these DMS if they're running synthetic I only run 5000 miles uh because if you got a customer if you put so right now he's got six thousand some to go what I've noticed on these if you're six eight ten Thousand Mile intervals the thing ain't gonna have a drop of oil in it when it comes in because it's going to burn all these DOD engines they burn oil like it ain't nobody's business so even on ours you know if we do our customers at 5 000 miles if they're not checking in between I mean they'll come in they'll be two quarts low which is not uncommon uh particularly like say as they start burning oil so especially you know 150 000 miles is probably an oil burner but I think we're in good shape for now I'll leave that up to him what he wants to do as far as going the rest of the way um his light's going to stay out now it's back within fuel control we reset the fuel composition for the alcohol counter clean the mass airflow and and the other two issues that were there history codes appear to be working so why don't you work your way down that comment section go down there leave me the question the comment the concern you have find me on the entity the Facebook you guys know what to do and just remind viewers I can do it you can do it thanks for watching foreign [Music]

Channel: South Main Auto LLC

Views: 266,622

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Id: UIErwFqxlzY

Length: 30min 4sec (1804 seconds)

Published: Mon Mar 27 2023