Engine Performance problem
1997 Chevy Suburban V8 Four Wheel Drive Automatic 174000 miles
Reference, same car as: http://www.2carpros.com/forum/here-vp58298.html That problem was fixed thanks to your help--thank you.
Since approximately March 2008 we noticed another problem which I describe as: Car cranks but won't start. After releasing the key it does a sputtering or diesel thing and sometimes some backfiring. For months it was occasional, but then no problem at all. Our guess as to why is humidity. When the weather would be very dry, then no problem.
First thing we tried was replacing the ignition switch thinking when in the start position ignition was not really happening. No improvement.
It was hard to troubleshoot because it seldom did the problem, but then a few weeks ago it went bad long enough to test some things. Fuel pressure was good, and spark (with tester) seemed good, but still no start. Chemtool down the air intake no help.
This time there was no starting it even trying for days. We noticed unplugging the MAF and air intake sensors did not produce any trouble codes, so replaced computer on August 28. Now it starts, but rough. Runs pretty well with MAF unplugged, so replaced MAF on Labor day, September 1. Then very happy with the operation of vehicle.
Drove several times, but not every day. September 9 went out in the drizzling rain to start it, but it was back to the original (see above) symptoms.
We have access to a good scanner for getting trouble codes.
If you have any questions to help troubleshoot, please send them.
have the same problem?
Wednesday, September 10th, 2008 AT 10:29 PM