Question about 1998 Pontiac Bonneville

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Shaking engine, almost no acceleration, check engine light flashing

While driving, the car shakes and jumps, i have almost no acceleration. i put oil and transmission fluid in, new spark plug wires and cleaned/spaced the spark plugs. while in idle, the car jumps but the check engine light doesnt flash.

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  • n1ghtmaresxt
    n1ghtmaresxt Jan 23, 2013

    i havent been able to get them checked due to lack of money. im trying to avoid a mechanic because they charge so much in delaware. i havent been hearing any wierd noises from the engine, but it was suggesed that it could be a timing issue

  • Leigh Perlmutter
    Leigh Perlmutter Jan 23, 2013

    That's true.


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How about timing? How about the distributor and rotor? What about the timing chain?

Posted on Jan 23, 2013

  • n1ghtmaresxt
    n1ghtmaresxt Jan 23, 2013

    i havent been able to get them checked due to lack of money. im trying to avoid a mechanic because they charge so much in delaware. i havent been hearing any wierd noises from the engine, but it was suggesed that it could be a timing issue


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SOURCE: 2002 grand prix

It was the Cat. Converter on mine, Don't drive it like that too long as it will send exhaust back through the EGR Valve and burn a hole in the Intake Plenum....

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SOURCE: Check Engine Light on and flashing on Montana 2001

Most major Autoparts stores will get the Diagnostic codes from car computer and give you info on why light is on and what the problem is.

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SOURCE: High idle in a 2004 Grand Am

Yes, the sensor is the first thing you should replace.

Posted on May 08, 2009

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SOURCE: Check engine light came on and began shaking everytime I start up

When was the last time the spark plugs and wires were replaced?

Posted on May 24, 2009

  • 4669 Answers

SOURCE: 2001 grand am se1. Rough Idle - Spark Plugs and Spark Plug wires

What engine? You need to have it scanned for codes. Autozone will do this for free

Posted on Sep 01, 2009

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Why is my car shaking

Short answer: If it quits shaking when you let off of the gas pedal, it is likely an engine misfire.

Long answer: I believe your model is new enough for the transmission to have a lock-up torque converter.
At around 40-45mph, the torque converter locks, making a solid connection between engine and transmission.
When this happens, any engine misfire is more readily felt throughout the car during acceleration.
The first items to check would be spark plugs, spark plug wires, and ignition coils. These are most likely to act up under load conditions such as acceleration.

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Year make and model ??
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Jerking/jumping while driving

An automobile's ignition system may work fine while idling but fail during acceleration. Problem areas to be inspected include the spark plugs, spark plug wires and vacuum hoses. Car owners should look for spark plugs that are covered in oil or sediment or damaged, spark plug wires that have damaged insulation, and vacuum hoses that are unplugged or leaking. Fuel Problems
  • The use of a fuel additive that contains both fuel injector cleaner and water remover can fix minor problems due to water in the gas and fuel injector clogs. A fuel pressure gauge can also be used to test the injection system to assure proper pressure.
While most acceleration problems are likely caused by problems with the plugs, wires or fuel, a variety of sensors and other components can cause similar problems. a bad tps ( throttle position sensor ) will cause causes transmission shift issues, bucking, jerking, idle surging, engine cutoff, hesitation on takeoff, and surging while going down highway.
good-day ! check and or clean maf sensor if need be. you can by the maf sensor cleaner at most auto parts stores.

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