2000 Chevy Venture running rough

HUNTER_GREEN177

MEMBER
2000 CHEVROLET VENTURE
6 CYL
FWD
AUTOMATIC
266,810 MILES

Hi I have a 2000 chev venture van that is running rough, I smokes a bit and the cediletic converter glows red, I noticed once you get it running it runs rough you can smell gas when you rev it up hesitates when you let go it idles rough and wants to quit. At first I thought the catillac converter was plugged I drilled some holes in it seem to help the smoking bit and ran a bit better but still rough. Noticed gas in oil and running really rich clean some of the plugs but still doing it and plugs went black again. I was wondering if you could tell me whats going on.

1 Reply

DAVE H

MECHANIC
13,384 POSTS

Check for a clogged air filter.
Check exhaust system for restrictions, such as a damaged or collapsed pipe, muffler or catalytic converter. See EXHAUST SYSTEM BACKPRESSURE under MECHANICAL INSPECTION in appropriate BASIC DIAGNOSTIC PROCEDURES article.
Check engine compression.
Check transmission shift pattern and downshift operation.
Check TCC system for proper operation.
Check for dragging brakes.
Check cooling system thermostat for proper heat range and operation.
Ensure initial ignition timing is properly set. Check EST and ESC for proper operation.
Remove spark plugs and check for wet/fouled spark plugs, cracks, improper gap, burned electrodes or heavy carbon deposits.
Check for excessively high fuel pressure.
Check for fuel pressure regulator leaking into intake manifold.
Check ECT sensor for shift in calibration. See ECT, DFT & IAT SENSOR RESISTANCE VALUES table in appropriate SENSOR OPERATING RANGE CHARTS article.
Check oxygen sensor for silicone or lead contamination.
Ensure speedometer is properly calibrated.
Ensure A/C system is not always on.