Engine ckeck light has come on!

Intermittent problems are difficult to diagnose. Misfires can happen from ignition parts starting to go bad. Modules, wires, etc. Damp and cold weather magnifies that sort of thing. Have the plugs been changed? Wires? If nothing else crops up, they are cheap places to start.

"Edwin Pawlowski" wrote in news:ec2%i.6072$Z01.5807@trndny01:

including leads and plugs etc (which were changed 5,000 miles ago) and found absolutely nothing. They concluded it might be mechanical but couldn't find anything. Any more ideas?

Since in both cases it happened from cold, make a note of the temperature outside. It may only do so, say, below 30 degrees. If that continues, leave the car at the shop on a cold day and have them put the meter on it when they start it up. I can't think of many mechanical items that can cause a mis-fire. Since it happens on all cylinders, it is more likely to be something like an ignition module than an individual wire. Engines have many sensors also and one may be malfunctioning giving a bad signal, injection problem, etc.

Since you have misfire readings on all four cylinders, you should start looking at things that affect all cylinders equally, such as fuel pressure, fuel quality, and perhaps even the crank sensor.

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