I was on a business trip for a week and when I came home, I decided to drive my car. The car will start but won’t stay on. The car continues to stall. I thought the fuel pump was bad so we checked the pressure of the pump and there is no issue. I don’t have any dummy lights or code failures (misfires). There has to be something electrical that is causing the failsafe to keep the car shutoff after turning the ignition. Oil pressures is 40 LBS.
Any ideas or suggestions?
passlock
Doesn’t lose any crank signal, starts right up and slowly dies. If I give it gas, it shuts down right away. No lights or error codes on the scanner.
IAC valve?
Will it stay running if you give it gas?
Mice make a nest in the air box?
ive seen the ECM go bad on these and this issue occur.
No mice nest
---------- Post added at 08:38 PM ---------- Previous post was at 08:35 PM ----------
If it give it a lot of gas or little gas right after start up, it dies right away. If I let it idle, it will slowly die within 5 to 10 seconds. We were able to get it into the garage by using ether.
The PSI for the fuel pump is 60 and the oil pressure is 40. TB has been checked and works (cleaned too). MAF has been disconnected and won’t stay running. There is something that is cutting the gas off from getting to the injectors.
---------- Post added at 08:40 PM ---------- Previous post was at 08:38 PM ----------
I really hope not because it just sat in the street for a week while I was in CA.
Someone suggested bad gas, tank is 3/4 full and I did fill up before I left.
I am kind of loss here and my buddy who is a mechanic and works on cars on the side is having a hard time finding the issue.
Does it start up right away after stalling or does it take a little while to get it going again?
I have a feeling your fuel filter is full of sediment.
Starts right up every time after the stalling. Fuel filter can’t be changed since it is in the gas tank.
I have been thinking it is bad gas.
Its a drive by wire TB right?
any issues there?
im not familiar with what your 06 tb is. is it I6, 5.3 or 6.0 ?
does it stall if the a/c and hvac are all turned off?
better yet. have you checked to see if it has any CEL codes that may have been set when it stalled out the first time?
NO IAC valve on DBW systems super tuner. The TBs have issues with throttle bodies sometimes and more often with Pedal/Accelerator position sensors (pedal assembly)
Make sure your battery is fully charged. Sometimes when it sits it’ll drop enough to mess with the security / ecu but will still crank.
It is the 4.2 I6 - everything is turned off.
---------- Post added at 11:24 AM ---------- Previous post was at 11:23 AM ----------
You are right about the TB, we have checked it out already - It appears the TB is electronically controlled. Is it possible that the TB valve is activated but the signal of the position is not going back to the computer thus air flows in and the computer does not activate the fuel pump to send more gas and it stalls.
Very common. I have replaced a dozen throttle bodies on these.
After getting a real computer to scan the Trailblazer - error code pops up - “Powertrain Indicated Traction Control Malfunction” - P0856
Dealership got back to me. The issue is the Mass Air Flow Sensor and the cam shaft selonoid
Expensive??
There are a bunch of DIY threads about cleaning the TB, cleaning the screens on the cam solenoid too.
From what I have read thus far on my envoy, the recommendations are always, clean the TB. Change the plugs to AC Delco (insert proper number here)
Then clean the solenoid.
