Engine Performance problem
2004 Chevy Venture 6 cyl Front Wheel Drive Automatic
'04 Venture has a stumble after initial startup, then smooths out and seems OK as long as it is kept running. Shut it off, and the cycle repeats. Has thrown code p0135 (O2 sensor), which I've replaced. Now shows a P0135 (pending) (not yet turned on the SES light)
Also new pump, fuel filter, air filter, & TPS. Visually checked MAF, looks to be plenty clean. Checked fuel pump pressure @ schrader fitting on manifold and got 52 - 54 PSI. Tried unplugging the vacuum source to the fuel pressure regulator, and got a pprox,. a 5 PSI rise in pressure, which I'm told is to be expected. I used dielectric grease only all connections when checking wire condition.
I'm seriously considering replacing the MAP sensor. Only have a few more days until it's due for annual emissions inspection....anyone have any ideas??
2004 Chevy Venture 6 cyl Front Wheel Drive Automatic
'04 Venture has a stumble after initial startup, then smooths out and seems OK as long as it is kept running. Shut it off, and the cycle repeats. Has thrown code p0135 (O2 sensor), which I've replaced. Now shows a P0135 (pending) (not yet turned on the SES light)
Also new pump, fuel filter, air filter, & TPS. Visually checked MAF, looks to be plenty clean. Checked fuel pump pressure @ schrader fitting on manifold and got 52 - 54 PSI. Tried unplugging the vacuum source to the fuel pressure regulator, and got a pprox,. a 5 PSI rise in pressure, which I'm told is to be expected. I used dielectric grease only all connections when checking wire condition.
I'm seriously considering replacing the MAP sensor. Only have a few more days until it's due for annual emissions inspection....anyone have any ideas??
Aug 31, 2010 at 8:58 PM