2004 Chevy Venture

QUARTERHORSE

MEMBER
2004 CHEVROLET VENTURE

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?

1 Reply

MADMIKE1735

MECHANIC
951 POSTS

If your due for emissions, bring it, and fail it. Then you gain 60 days. In the mean time u can re-register if thats the reason your crunched for time. In the meantime, as long as the check engine light isnt on, and all the monitors have cleared, you will pass emissions.