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2001 Pontiac Grand Am - rough running; 'jerks' when it shifts gears; is it a timing issue?

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  • Anonymous Dec 09, 2012

    Arthur--while I think you may be 100% correct. Would you not do some testing of the coils before replacing, or just replace the failed ones Possibly scope them or road test on Mode #06 if avail to that system & check cylinder misfire counts. Not learning anything installing parts Just Asking

  • Anonymous Dec 13, 2012

    Joe your 100% correct in waht you did Questions asked on the internet is no subsitute for learning your cars systems & proper testing to find route causes of any problem Cylinder Leak Down Test is the way to go vs: compression alone

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I had asimilar problem with my 2.4 quad4 grand am it would miss when I stopped at a stop light but when driving ran fine I thought the problem was with the ignition too so I changed out the coil ignition module assembly but still the same I spoke wth my nephew he had a problem like this and he went alot farther to find the core problem he changed coil ignition module assembly not fixed yet changed timing chain still not fixed compression tested found a burnt exhaust valve
with that information Iwas determined to fix my grand am so I pulled off the intake manifold assuming Iwould remove the engine for rebuild did a compression test all cylinders were the same ruling out any problem with the valves had to do some research and learned more about how the injectors are contrlled by the ECM engine contrl module wich gets signals from sensors for fuel mix engine timing and engine idle speed
the oxygen sensor for fuel mix engine coolant temp sensor knock sensor mass air flow sensor or manifold absolute pressure and throttle position sensor the ecm gets info concerning engine rpm shift lever position power steering and air conditioning
with that being said I had checked the coolant level and put some injector cleaner in the gas tank after assembling engine had drove the car some more and the problem went away

Posted on Dec 13, 2012

  • joe kidrowski Dec 13, 2012

    I question wether you checked service engine codes if you do not have tools for this some auto parts stores will do it at no charge I am sure you will have a code for cylinder misfire on multiple cylinders wich is obvious but that does not point directly to ignition could also be a problem with fuel injectors as well any codes for faulty sensors should come also

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That looks like the Quad Four derived(2.4 liter?).They have a "coil on plug' design-the early Quad Fours were one of the first with this design.It sounds like one of the coils is going bad,causing a miss under load(or it just gets worse under load).Change the ignition coils and plugs(under the large cast aluminium cover on top).

Posted on Dec 09, 2012

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Is it a timing issue?

Would you like someone on the internet to guess at an answer?

I would think you would have done some testing & asked something
else & provided a more technical question, of what was tested so far & how

Posted on Dec 09, 2012

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