Jmattioli

Its not a No Start its a Start then immediately stalls. the starting then immediately stalling has happened since the day i bought the truck. It happened intermittently at the time, but i would wait until the next day and the truck would start. then i would continue on with the repairs from the codes. after about a week of waiting for a day for it to start and stay running, it finally decided to never stay running again. there were several problems that were being worked on at once. 1) High Idle 2) Intermittent Start and immediate stall 3) passlock housing needed to be changed because previous owner drill several holes into the housing next to the sensor. After TBI, TPS, AIC were change the truck started and i drove it several miles to my house. Started it up the next morning to make sure it was going to start in the Sub Zero temperatures we were having at the time. It started and stayed running. tried again after temps warmed up outside again so i could work on the ignition and passlock housing issues. The truck at that point only started and stalled every since that time. now cannot get the truck to stay running.

thanks, I have no knowledge of how to check the MAP sensor without the truck actually running. any suggestion?

not to my knowledge, but i cannot be 100% positive(bought the truck used with 3/4 tank of gas in it). A small oversight like this would be great news. I'll add drygas and see if that helps.

Can't just put everything back (the arm for the adjuster screw on the TBI was bent, causing the high idle, couldn't be adjusted properly). the no start is what cause the changing of the PCM (not the high idle condition), everything that relates to the high idle Air flow issue is brand new. TBI, AIC,TPS, and MAF as far the PVC valve itself it is unlikely, but i have one just in case. It is the no start/stalling issue that is the problem at this point. Which I have already replaced any part that had been tampered with (many resistors soldered into the ignition wireset, and the passlock housing which had been drilled into by the previous owner). The no start stalling issue was intermittent before the repairs. would start and run, then wouldnt start for a whole day afterwards. now just never stays running. I opted to replace the PCM because I felt it was more probable than the BCM to cause the stalling issue. I may be wrong about this and that is why I am here. Any chance the BCM would interfere with the truck staying running? I don't have much invested into this truck, bought it for less than $1000 (80k miles and excellent body and frame) plus have only parts and my time into as far as repairing it.

was it one coil or did you change all 8? was not sure about coils since it does start then stall immediately.

fuel pressure is normal it is 55lbs when ignition is turned to on and jumps to 62lbs when engine cranks, No the security light is off. i did the passlock reset after installing new PCM. Engine ran without MAF when it would start.

I know there will be question why I replaced a couple of things so I will let you all know that I first replaced the TPS because an extremely high idle and found no vacuum leaks. Then replaced the TBI because the Airflow code I had on the truck. The AIC was also new on the TBI. The stalling issue happened intermittently while I was working on the truck and now does it constantly. So I replaced some of the other items listed in this post. I do not have access to a tech2 so some of the proper testing is not an option for me, and I live in the middle of no where.

I have a 2001 GMC Sierra 1500 SLT 5.3l that I bought used with only 80k miles on it. This truck starts then immediately stalls. Here is a list of things that I have replaced to no avail. Any help would be greatly appreciated. 2001 gmc sierra 1500 SLT 5.3l Replaced TPS Replaced TBI Replaced ignition Replaced passlock housing Replaced Ignition cylinder Replaced PCM/ECM/ECU Replaced fuel pressure regulator Truck had codes of P0102, P0105 and P0507 No codes available at this point because of changing PCM/ECM/ECU Thanks Jeff

It is a cable and the cable has slack in it. Could it be possible that the idle in the ecm needs to be relearn ed? I have not put this truck on the road yet so putting a 44 mile drive cycle on it isn't an option right now

I bought a 2001 gmc sierra 5.3l slt. It has an extremely high idle (3000 rpm) in park and neutral. In drive it drops to 1000. Have replaced tps and aic both. Cleaned the TB just to be safe also. After all of this I still have a high idle no change at all. Not suse where to go next. Sprayed the intake and no change in idle speed Code P0507 which is generic for aic on this vehicle. Any help would be greatly appreciated. Only 80k miles on the truck so worth the money to fix it as I bought it dirt cheap