I've got a crazy issue that started this week that hopefully you guys can help me figure out but first some history and vehicle details.
2002 Bravada 280000kms, 4.2L inline 6
I've had the truck for ten years and for many years I've had an off-idle hesitation that sometimes stalls the engine when trying to accelerate from a stop.
Early last spring I had the tranny rebuilt, then did a good tune-up which includes:
fuel filter, MAP sensor, camshaft position actuator valve, air temp sensor, spark plugs, front oxygen sensor, air filter. Removed the throttle body and cleaned it real good which got rid of the hesitation. Tried replacing the camshaft position sensor but two aftermarket ones didn't work so I haven't tried another one since. I did remove the throttle body again last fall but it was still nice and clean so I didn't do anything to it.
A month later the new torque converter failed and took out the whole guts of the tranny so in it went again on warranty. When I got it back the hesitation was back. Been the same since.
On Tuesday going at 100km/h with cruise on, the engine suddenly died, pulled onto the shoulder, put it in park, turned the ignition off, restarted perfectly with engine light on. The hesitation is now gone and have full power again. Got to a parking lot and checked the code and it said P1514 TAC System MAF Performance. Cleared the code and drove home with no problems.
Next drive today at 50km/h and engine dies. Stopped, put in park, turned off ignition, went to start it but was in limp mode at 500rpm and engine idled extremely rough. Got same code again, cleared it but took about five minutes before it started and ran fine. Drove about a mile and it died again. Coasted into a parking lot, restarted rough, tried again and ran fine but the hesitation was back. Got an hour down the highway and died again, put it in neutral, shut off the ignition as far as I could, restarted fine, put back in gear and kept going. Cruise control wouldn't work until fifteen minutes later, not sure about hesitation. Went another half hour on highway and died again but would not restart, had to pull over and stop for about five minutes before I could get the engine to start normally again, no hesitation, full power. Made it home and then cleared the code again.
So since this doesn't really have a MAF sensor that is cleanable would I be looking at a new throttle body? Should I try a sensor reset like one of you suggested in another post by disconnecting the battery and touching the cables together for a minute?
Thanks.
2002 Bravada 280000kms, 4.2L inline 6
I've had the truck for ten years and for many years I've had an off-idle hesitation that sometimes stalls the engine when trying to accelerate from a stop.
Early last spring I had the tranny rebuilt, then did a good tune-up which includes:
fuel filter, MAP sensor, camshaft position actuator valve, air temp sensor, spark plugs, front oxygen sensor, air filter. Removed the throttle body and cleaned it real good which got rid of the hesitation. Tried replacing the camshaft position sensor but two aftermarket ones didn't work so I haven't tried another one since. I did remove the throttle body again last fall but it was still nice and clean so I didn't do anything to it.
A month later the new torque converter failed and took out the whole guts of the tranny so in it went again on warranty. When I got it back the hesitation was back. Been the same since.
On Tuesday going at 100km/h with cruise on, the engine suddenly died, pulled onto the shoulder, put it in park, turned the ignition off, restarted perfectly with engine light on. The hesitation is now gone and have full power again. Got to a parking lot and checked the code and it said P1514 TAC System MAF Performance. Cleared the code and drove home with no problems.
Next drive today at 50km/h and engine dies. Stopped, put in park, turned off ignition, went to start it but was in limp mode at 500rpm and engine idled extremely rough. Got same code again, cleared it but took about five minutes before it started and ran fine. Drove about a mile and it died again. Coasted into a parking lot, restarted rough, tried again and ran fine but the hesitation was back. Got an hour down the highway and died again, put it in neutral, shut off the ignition as far as I could, restarted fine, put back in gear and kept going. Cruise control wouldn't work until fifteen minutes later, not sure about hesitation. Went another half hour on highway and died again but would not restart, had to pull over and stop for about five minutes before I could get the engine to start normally again, no hesitation, full power. Made it home and then cleared the code again.
So since this doesn't really have a MAF sensor that is cleanable would I be looking at a new throttle body? Should I try a sensor reset like one of you suggested in another post by disconnecting the battery and touching the cables together for a minute?
Thanks.