Question about 1994 Toyota Camry

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I have a 94 Camry, V6, and check engine light came on. Took it to Toyota and they charged me $54 to hook up the machine and read the codes. Then they wanted $350 to do anything more. The codes are PO300 for multiple cylinder misfires (2, 4, and 6). Any ideas about what I might try on my own?

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The code P0300 may mean that one or more of the following has occurred:

Faulty spark plugs or wires
Faulty coil (pack)---->(Likely culprit)
Faulty oxygen sensor(s)
Faulty fuel injector(s)
Burned exhaust valve
Faulty catalytic converter(s)
Stuck/blocked EGR valve / passages--->(Likely culprit)
Faulty camshaft position sensor
Defective computer---->(Worst case scenario)

With that said; If there are symptoms such as the engine is stumbling or hesitating; Check all the wiring and connectors that lead to the cylinders. Depending on how long the ignition components have been in the car, it may be necessary to replace them at this point. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs-COP-). In some cases, the catalytic converter will have collapsed(comb deterioration). If you smell rotten eggs in the exhaust, your catalytic converter should be replaced. You may have faulty fuel injectors, as well.

Random misfires that tend to jump around from one cylinder to another will usually post a P0301-6 code and also will set a P0300 code, as well. The usual culprit is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or un-metered air getting past the airflow sensor, or an EGR valve that is stuck open. check these areas first.

Posted on Jul 16, 2010

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