CAR STUMBLES/STUTTERS/HESITATES UPON ACCELERATION FROM DEAD STOP OR INCREASING SPEED SOMETIMES

2003 Chevrolet Venture

Tiny

ronbo1

March, 17, 2012 AT 3:04 AM

New fuel filter, newplugs/wires/o2 sensor, dry gas, injector cleaner, no codes, certified mechanic found no misfires in computor history, 52psi gas pressure gauge reading engine off key on, 55psi at idle, 58/59psi on accelaration to say 50mph, even stumbles/hesitates at 58/59psi. Could it be coils? Fuel pressure regulator holds vacuum ok, sometimes it runs fine. Van has electronic egr. Depressing on accelerator when stumbling causes engine to perk up and car gets going. With brakes locked and gas pedal floored rpm changes by around 500rpm about.

FOUND 2794 RELATED QUESTIONS

9 Answers

Tiny

fixitmr

March, 17, 2012 AT 4:01 AM

Very doubtful coils at fault since no misfires.

Tiny

fixitmr

March, 17, 2012 AT 4:49 AM

Does it feel sound like misfiring or just loss of power?

Tiny

fixitmr

March, 17, 2012 AT 5:11 AM

Needless to say, live data monitoring would help zero in on issue.

Tiny

ronbo1

March, 17, 2012 AT 7:03 AM

Does not sound like misfire. Is loss of power. Surges up and down I would say about 4-500rpm approx it has no tach. We used to say it was "breaking up" when u get on the gas.

Tiny

fixitmr

March, 18, 2012 AT 6:42 PM

Live data monitoring would be advantageous. Wonder if auto chain stores can do that?

Tiny

ronbo1

March, 19, 2012 AT 1:04 AM

I am giving up on it and dropped it off at the chevy dealer this evening. Hopefully I wont have to take out a second mortgage to pay them if they can find out the problem. Thanks for ur help.

Tiny

fixitmr

March, 19, 2012 AT 8:05 AM

Let us know how it goes.

Tiny

ronbo1

March, 21, 2012 AT 2:26 AM

Dealer says it s catalytic converter plugged wants 1300.00 bucks lolo takin to a mom and pops to see what he says.

Tiny

Chevyforlife

April, 4, 2012 AT 2:08 PM

If it isnt a cat maybe look at a pressure control solenoid. Causing a shudder under load when hot. Pretty common problem with the transmission in your van.

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