Question about 1997 Honda Accord

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Really rough engine idle at cold start up,, reving the engine seems to smooth it out,,,,

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Some causes about rought idle could be:
- Valve adjustment
- Incorrect ignition timing,
- Vacuum leaks
- Bad ignition wires (Test w/ ohmmeter)
- Incorrect idle speed
- Cold Start Injector always "ON" (Revised injector time switch avail.)

A source of rough idle in EFI engines is air leaks or vacum leaks these leaks will upset the fuel mixture without triggering any codes. A bad oxigen sensor will also cause a rough idle, but you should see a code for it ( I think is number 5, but check it).

A good place to start would be an inspection of the spark plugs, plug wires, ignition timing, and idle speed. Next would be valve adjustment. Don't overlook the simple things.

Hope this helps, keep us updated and just keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa.

Posted on Nov 04, 2011

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