frankt
06-13-2007, 08:47 AM
1997 G20 van 240,000 miles, SSDiesel FSD Cooler, new turbo at 215,000:
Immediately after an oil change (within 500 feet of leaving the shop) the engine "shut off" for a split second twice within about 10 second, engine never shut off completely (I did not have to restart it), just like I lifted off throttle for a split second and then hit it again.
3 days later I went into my bank and left van running, came out 5 minutes later and engine was off (key still in "ON").
Then 2 days later as I was backing into driveway I felt a "surge" in throttle, enough to dig into gravel drive for about 1/2 foot before I lifted off throttle then acted normal again. I also noticed that when the guy was pulling van into oil change shop the van seemed to "surge" forward on him too, but I figured he was just not used to vehicle, and didn't think anything of it.
Another thing it is doing (just started in past 2 weeks) is it is running very cold on coolant temp gauge, (but boost and EGT is normal) unless engine is under load (highway speed with AC on). I was planning to change the thermostats, figured they were hanging/stuck, but if cooling system is under heavy load (highway, AC on hot day) the temp seems to climb above normal level, similar to issue I had before I changed turbo??
No trouble codes tripped.
Is this a failing PMD, Throttle position sensor, something new, or combination??? Any suggestions would be appreciated. Thanks, Frank
Immediately after an oil change (within 500 feet of leaving the shop) the engine "shut off" for a split second twice within about 10 second, engine never shut off completely (I did not have to restart it), just like I lifted off throttle for a split second and then hit it again.
3 days later I went into my bank and left van running, came out 5 minutes later and engine was off (key still in "ON").
Then 2 days later as I was backing into driveway I felt a "surge" in throttle, enough to dig into gravel drive for about 1/2 foot before I lifted off throttle then acted normal again. I also noticed that when the guy was pulling van into oil change shop the van seemed to "surge" forward on him too, but I figured he was just not used to vehicle, and didn't think anything of it.
Another thing it is doing (just started in past 2 weeks) is it is running very cold on coolant temp gauge, (but boost and EGT is normal) unless engine is under load (highway speed with AC on). I was planning to change the thermostats, figured they were hanging/stuck, but if cooling system is under heavy load (highway, AC on hot day) the temp seems to climb above normal level, similar to issue I had before I changed turbo??
No trouble codes tripped.
Is this a failing PMD, Throttle position sensor, something new, or combination??? Any suggestions would be appreciated. Thanks, Frank