Misfiring - Rough Idle - Codes for all Cylinders
#1
Thread Starter
Misfiring - Rough Idle - Codes for all Cylinders
Any help/insights are appreciated, the engine runs great except at idle or below about 3k with no load. Under acceleration the engine runs great including VTEC. My theory is that it may be a single failure common to all cylinders since they all started misfiring at the same time? This is a bit long, but I wanted to provide enough information.
I have read many threads on rough idle and misfires and have tried some of the recommended solutions. I have also used the shop manual and followed some of the trouble shooting paths for the codes indicated below, but there are limitations because the manual assumes a code on one cylinder not four. So, swapping around an ignition coil, spark plug, or fuel injector won
I have read many threads on rough idle and misfires and have tried some of the recommended solutions. I have also used the shop manual and followed some of the trouble shooting paths for the codes indicated below, but there are limitations because the manual assumes a code on one cylinder not four. So, swapping around an ignition coil, spark plug, or fuel injector won
#3
Thread Starter
Originally Posted by Slows2k,May 19 2005, 10:09 PM
A cylinder leakdown test will tell you if the valves are not sealing.
Should a leak down test should be done with the engine warm like when doing a compression test?
I plan to use a pressure regulator set to 100 psi and the hose from my compression tester to perform this test. What is an acceptable result for this engine? I'll also listen for air sounds at the intake and exhaust.
This is my first time doing one of these.
I'll post the results.
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#8
Thread Starter
Originally Posted by webestore,May 20 2005, 01:59 PM
I had three coils go bad at one time, got new ones and it fixed the problem
Thanks
#9
Thread Starter
Originally Posted by yogi,May 20 2005, 09:51 PM
I don't remember the exact spec, but I *think* that's a little low. Someone verify the #'s. If the compression test shows no problems, a leakdown isn't going to help much.
I will go ahead and do the leak down test regardless just to be complete. This should happen tomorrow some time.
Thanks