Engine Performance problem
2002 Ford F150 V8 Two Wheel Drive Automatic 98000 miles
I have a 2002 F-150 Supercrew w/ a 4.6L V8 (about 98K miles). When I start the engine, it will not hold an idle and stalls. If I start the engine and hold the RPM at about 1500 for a few seconds, I hear a 'pop' noise followed by a 'hiss', then it idles just fine. If I start the engine and immediately put it into gear, it will idle OK, but not that well. Other than when it is started, the truck runs just fine.
Here's what I've tried:
-Cleaned the PCV valve & checked hoses (best I could for a quick once-over)
-Cleaned and lubed the IAC valve (with good resistance checks)
-Cleaned the MAF sensor
Someone recommended cleaning the EGR valve, but I did that same thing about 6 months ago. Plus changed the DPFE sensor.
Haynes recommended removing the PCV valve while idling and checking for a vacuum. When I did it the engine died.
Thank you for your time. Have a great day!
have the same problem?
Tuesday, June 29th, 2010 AT 9:50 AM