Edmunds Answers

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  • avatar karjunkie 11/12/08 10:50 am PST

    OK, before we go to a very expensive option of replacing the PCM, lets try the easy stuff you can do cheaply. First, check your fuel filter. Momentary clogging will cause your problems. Next, remove and clean the MAF sensor wires with some CRC sensor spray. Next, check your distributor cap, rotor, igniter and spark plug wires for cracks, fraying or arcing. Next, pull a plug and check for proper gap and wear. Next, replace the crankshaft position sensor. Very easy to do. At this stage you've spent 50 bucks and did things you needed to do anyway as routine maintenance. Now to the PCM. Sometimes, there will be a short in the PCM case that is intermittant. Big problem with certain models that is somewhat easy to fix. What you do is remove the cover screws to the PCM, put rubber o rings or washers on the screws and reinstall. Next least expensive option is to "reflash" the PCM at the dealer. This will reset all the factory values and may cure the problem. Lastly, find a used PCM at a junkyard. Expensive but about 1/3 the cost of a new one. Good luck!

Answers

  • karjunkie 11/12/08 10:50 am PST

    OK, before we go to a very expensive option of replacing the PCM, lets try the easy stuff you can do cheaply. First, check your fuel filter. Momentary clogging will cause your problems. Next, remove and clean the MAF sensor wires with some CRC sensor spray. Next, check your distributor cap, rotor, igniter and spark plug wires for cracks, fraying or arcing. Next, pull a plug and check for proper gap and wear. Next, replace the crankshaft position sensor. Very easy to do. At this stage you've spent 50 bucks and did things you needed to do anyway as routine maintenance. Now to the PCM. Sometimes, there will be a short in the PCM case that is intermittant. Big problem with certain models that is somewhat easy to fix. What you do is remove the cover screws to the PCM, put rubber o rings or washers on the screws and reinstall. Next least expensive option is to "reflash" the PCM at the dealer. This will reset all the factory values and may cure the problem. Lastly, find a used PCM at a junkyard. Expensive but about 1/3 the cost of a new one. Good luck!

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