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Well all of those codes relate to your transmission. What all did you remove when you did this job? the cylinder head? just curious because that is a fairly big job which includes replacing head gaskets etc. did you take both heads off? Now the codes you mention are all related so you may want to check any nearby wires by the jobsite. I know most truck engines will have the wiring harness drop down to the transmission behind the cylinder heads and when removing those you may have snagged a wire or something. I once had a situation where I replaced the engine on a dodge durango and it would not start afterwards. It was due to a similar situation where I accidentally pulled a terminal wire from the transmission solenoid pack which just so happened to be a part of the neutral safety switch circuit. did you have these codes before you did this work? if so it is most likely a legitimate issue, sounds like a bad solenoid if you ask me. or a pressure sensor. Which can be a nightmare or an easy fix depending on the transmission. Does the truck drive ok? In regards to the exhaust manifold gaskets, why do you need to remove the stud? shouldn’t that be getting a nut on it? if im wrong, which is very possible, use the two nut method as collegeman said, it works great. Trust me when I say have faith in yourself. Remember, its just a dumb machine, humans created it so you will figure it out. Anyways keep us updated, good luck.
Well all of those codes relate to your transmission. What all did you remove when you did this job? the cylinder head? just curious because that is a fairly big job which includes replacing head gaskets etc. did you take both heads off? Now the codes you mention are all related so you may want to check any nearby wires by the jobsite. I know most truck engines will have the wiring harness drop down to the transmission behind the cylinder heads and when removing those you may have snagged a wire or something. I once had a situation where I replaced the engine on a dodge durango and it would not start afterwards. It was due to a similar situation where I accidentally pulled a terminal wire from the transmission solenoid pack which just so happened to be a part of the neutral safety switch circuit. did you have these codes before you did this work? if so it is most likely a legitimate issue, sounds like a bad solenoid if you ask me. or a pressure sensor. Which can be a nightmare or an easy fix depending on the transmission. Does the truck drive ok? In regards to the exhaust manifold gaskets, why do you need to remove the stud? shouldn’t that be getting a nut on it? if im wrong, which is very possible, use the two nut method as collegeman said, it works great. Trust me when I say have faith in yourself. Remember, its just a dumb machine, humans created it so you will figure it out. Anyways keep us updated, good luck.
So I think I fixed the car, or at least made it start correctly. After taking the line off of the booster I got thinking. Well I decided to remove the pcv and try running the car. What do you know it fires right up. So i try sucking on the pcv(yeah I know what your thinking) and it kind of stuck at first or at least hard to move air through it. so after blowing and sucking on this oily valve it feed up. and now the car starts fine 95% of the time. So Ill be picking up a new one tomorrow. I think the spring inside is collapsed. I don’t know if this explains the odd fuel trim numbers and the horrible mileage but as bad as this sounds I am selling the car so it wont be my problem anymore. I hate being brand bias because all cars have their issues, but this is by far the worst vehicle I have ever owned, and I wont be buying any GM product of this vintage any time soon. Thanks everyone for your help and suggestions, it is greatly appreciated.
So I think I fixed the car, or at least made it start correctly. After taking the line off of the booster I got thinking. Well I decided to remove the pcv and try running the car. What do you know it fires right up. So i try sucking on the pcv(yeah I know what your thinking) and it kind of stuck at first or at least hard to move air through it. so after blowing and sucking on this oily valve it feed up. and now the car starts fine 95% of the time. So Ill be picking up a new one tomorrow. I think the spring inside is collapsed. I don’t know if this explains the odd fuel trim numbers and the horrible mileage but as bad as this sounds I am selling the car so it wont be my problem anymore. I hate being brand bias because all cars have their issues, but this is by far the worst vehicle I have ever owned, and I wont be buying any GM product of this vintage any time soon. Thanks everyone for your help and suggestions, it is greatly appreciated.
fuel pressure when running is 52 psi at idle, my fuel pump and fuel pressure regulator are both new. after i turn the car off the fuel pressure goes down to 35 after 2 or 3 minutes. bank 1 sensor 2 O2 sensor stays at .7 all the time. bank 1 sensor 1 O2 rapidly changes.
fuel pressure when running is 52 psi at idle, my fuel pump and fuel pressure regulator are both new. after i turn the car off the fuel pressure goes down to 35 after 2 or 3 minutes. bank 1 sensor 2 O2 sensor stays at .7 all the time. bank 1 sensor 1 O2 rapidly changes.
o2 b1s1: 0.7 V
o2 b1s2: voltage is all over the place, erratic
stft: 0 at idle, goes up as i give it gas
ltft: -16 at idle and -22 when i give it gas.however, I made the discovery that when I remove the brake booster hose the car starts perfectly. so does that mean that its starved for air? and I forgot to mention that I am only getting 200 miles to a tank of gas so something is not right.
o2 b1s1: 0.7 V
o2 b1s2: voltage is all over the place, erratic
stft: 0 at idle, goes up as i give it gas
ltft: -16 at idle and -22 when i give it gas.however, I made the discovery that when I remove the brake booster hose the car starts perfectly. so does that mean that its starved for air? and I forgot to mention that I am only getting 200 miles to a tank of gas so something is not right.
Ok this is really something. I replaced the upper intake gasket, and throttle body gasket. so now the whole intake is clean and not leaking. All of the sensors on the throttle body are new, and the coolant temp sensor is also new. The car runs great, but it still has the starting issue. It will start when its cold no problem. but as soon as you drive it five minutes or five hours and you shut the car off and try to start it it just simply wont turn over. and its so weird cause you can tell it wants to, it just barely doesn’t stay running. even sometimes it will stay running but it will catch itself at 400 rpms and then it will increase the rpms. I notice that the fuel trim numbers are kind of weird like in the -10.5’s i don’t think they should be near that, should they? what would be making those fuel trim numbers so far into the negatives?especially if the MAF, Temp sensor, IAT, and TPS are all functioning properly. its just so strange. I was kind of thinking ICM since they are known failures on these cars but it always has spark when it wont start.
Ok this is really something. I replaced the upper intake gasket, and throttle body gasket. so now the whole intake is clean and not leaking. All of the sensors on the throttle body are new, and the coolant temp sensor is also new. The car runs great, but it still has the starting issue. It will start when its cold no problem. but as soon as you drive it five minutes or five hours and you shut the car off and try to start it it just simply wont turn over. and its so weird cause you can tell it wants to, it just barely doesn’t stay running. even sometimes it will stay running but it will catch itself at 400 rpms and then it will increase the rpms. I notice that the fuel trim numbers are kind of weird like in the -10.5’s i don’t think they should be near that, should they? what would be making those fuel trim numbers so far into the negatives?especially if the MAF, Temp sensor, IAT, and TPS are all functioning properly. its just so strange. I was kind of thinking ICM since they are known failures on these cars but it always has spark when it wont start.
yeah tje engine light functions properly, However this morning the problem got much worse to the point of the car not running good at all. It pops and misfires and all kinds of stuff. and there was a loud hissing sound coming from the engine, which turned out to be the upper intake gasket. It has a huge hole in it next to the throttle body, so it looks like ill be changing that now and then we will see how she runs.
yeah tje engine light functions properly, However this morning the problem got much worse to the point of the car not running good at all. It pops and misfires and all kinds of stuff. and there was a loud hissing sound coming from the engine, which turned out to be the upper intake gasket. It has a huge hole in it next to the throttle body, so it looks like ill be changing that now and then we will see how she runs.
Well bad news, I changed the TPS and nothing has changed. I find this so puzzling. The throttle body is actually clean as a whistle, the egr pipes are clear, I don’t get it. It starts perfect every time on a cold start, but as soon as it runs for a little while, it doesn’t even have to get hot and then 50% of the time it starts fine and the other 50% of the time it wont unless I feather the gas.
Well bad news, I changed the TPS and nothing has changed. I find this so puzzling. The throttle body is actually clean as a whistle, the egr pipes are clear, I don’t get it. It starts perfect every time on a cold start, but as soon as it runs for a little while, it doesn’t even have to get hot and then 50% of the time it starts fine and the other 50% of the time it wont unless I feather the gas.
Yeah you were right, I hooked my scope up and graphed the sensor and it drops off and spikes at idle, and when i move the throttle plate and tap on it it spikes and drops as well. I didn’t think that the tps was bad being that it ran good and shifted fine, I assumed it was good and look where that got me. Ill verify that this fixed it once I get the sensor swapped out. Thanks again -Darren and have a great weekend everyone!