Question about 2000 Pontiac Grand Am GT

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1999 grand am running a tad bit rough now service engine soon light on

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This is usually an easy fix:

Try this:

1. Full Tune up: (have diagnostics test done at auto parts dealer / should be free and takes like 5-10 minutes). This will let you know what parts/components may need replaced, and will save you a lot of time and even money.(Baxters, Napa, Auto Zone etc)

a. plugs and wires - air & fuel filter
b. distributor cap and rotor (if equipped)
c. tap on MAS (mass airflow sensor; if equipped) will be located between airfilter casing and intake manifold. If idle hesitates or car dies, replace. If not, (optional) purchase some MAS cleaner and spray the inside. Let airdry for about 20 minutes, then reassemble.
d. O2 sensors. One or both of these may be bad.
e. Once O2 sensors are replaced, light may stay on - go to auto parts dealer and ask them to run a diagnostics and clear the codes.

Also, if this has a distributor, check the cap and rotor (replace for safemeasure) it never hurts to.

If it has coil pack(s), have it (them) tested as one may be bad and will cause the car to run rough, but still run. Loss of power will be experienced as well.

There is a modular that sits just under the pack(s). This cannot be tested, but if it looks melted, bubbly, or white, it probably needs replaced.

Let me know if you need any further assistance with this matter.

carsandcomps,

Guru, Premium Expert @Fixya.com

Posted on Apr 26, 2010

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