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My 2004 Pontiac grand am is running very rough. At slow speeds it hesitates to accelerate. We replaced the spark plugs and wires, the o2 sensor, air filter, PVC valve.

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  • Cars & Trucks Master
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You miss the coils and module.fuel filter.

Posted on May 03, 2013

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Posted on Jan 02, 2017

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SOURCE: 1989 Cavalier Z24 3.1 rough idle and hesitation

its just white cuz i too the cat off..

cuz i thought my proble could have been to do with the cat...

cuz i lost power driving up hills and on highways now it just will start the die right away

or start and idle really bad...

any ideas???

i was thinking crank sensor.. or injectors

Posted on Oct 01, 2008

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SOURCE: I own a 2002 Chevy Trailblazer with 4200 vortec

Do you know if the plugs were changed, a bad or broken plug will also cause rough idle and slow acceleration?

Posted on Oct 21, 2009

  • 14585 Answers

SOURCE: 2004 pontiac grand am replaced O2 sensor, spark

Idle air control motor(IAC). EGR valve. And vacuum leaks to include the brake booster and if you have a plastic intake, that too. this is a start there are other things that will have the same symptoms. let me know
Randy

Posted on Nov 12, 2010

SOURCE: Ford F150 engine backfiring, running/idling rough

I Have a 1999 ford f150 4.6 that back fires and is just running really ruff when idling alot of nack fire a sord of like a pulse going on what is my problem?

Posted on Oct 12, 2011

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My 2007 pontiac grand prix seems to be having some misfire. When warming my car its kind of a rough idling and also when driving. Its seems like it wants to cut off and kinda stalls when pulling off.


Sensors dude.... O2, Water temp, Air charge, Power steering pressure switch, Idle speed control solenoid, throttle position sensor..............SPARK PLUGS & FUEL FILTER....

Mar 22, 2017 | Pontiac Cars & Trucks

1 Answer

What is the cause of the acceleration hesitation and engine dying?


a simple test is to disconnect the vacuum hose to the brake booster and blank it off on the manifold side
if there is no problem, reconnect it and put your foot on the brake
if the problem is there --replace the brake booster
check all vacuum hoses including the vent controls and transmission actuator
if you haven't done it yet then run the fault codes for reports and that will tel you what should have been done first

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04 Grand Prix Cut out / Hesitation on acceleration between 2k and 3k rpms but not at WoT. MAF replaced, plugs, wires, o2 sensor (rear), Cat tested @500 degrees on output, throttle body replaced, unplug...


Check for a vacuum or air leak. Possibly a hose or intake manifold. Odd that it runs better on default MAF settings with MAF unplugged, but if no codes indicating a circuit problem, IDK. Could be a vacuum leak.

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I have a 00 pontiac grand prix gt and I dont know why my car hesitates when I am accelerating. Also I can feel and hear my engine bogging down like it wants to shut off esp when I am stopped or driving...


egr will only affect running at idle or slow speeds.under acceleration it can indicate poor tune-up components or even a partially plugged fuel filter not allowing enough fuel,or even a weak pump.a bad tps(throttle position sensor) can also act the same way,usually it will set a code,but not always.if it has a(maf) mass air flow sensor on this system it can cause the poor acceleration,again usually, but not always, will set a code in the computer.

Mar 17, 2011 | 2000 Pontiac Grand Prix

1 Answer

2004 pontiac grand am replaced O2 sensor, spark plugs, plug wires and fuel pressure regulator. starts easily. idles very rough. When accelerating car runs well. When cruising on freeway with engine...


Idle air control motor(IAC). EGR valve. And vacuum leaks to include the brake booster and if you have a plastic intake, that too. this is a start there are other things that will have the same symptoms. let me know
Randy

Nov 12, 2010 | 2004 Pontiac Grand Am

1 Answer

I have a 2001 Grand Am 3.4l V-6. I have replaced spark plugs, wires and coil pack. Still has rough idle and hesitation during driving.


check the plug where the air intake connects to the engine. i had a loose connection in mine, it cost me an alternator that i didn't need. the wire also caused rough shifting.

Sep 22, 2009 | 2001 Pontiac Grand Am SE

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1997 Pont Grand Prix ---- P0303 again & again


I would inspect the connecter and wires for the #3 cylinder fuel injector for damage.

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2001 mercury grand marquis. Engine stutters or hesitates with jerking when lightly accelerating. Seems like an air, fuel, or spark delivery problem. At wide open throttle this problem is not as noticeable....


Start car and use a squirt bottle of water to wet the wires and coil, if you see it spark or run rough one or both are bad, repair the wires first as they are more common.

Aug 02, 2009 | 2001 Mercury Grand Marquis

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