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Old 06-23-2011, 10:18 AM   #1
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Join Date: May 2011
Location: Castle Rock
Posts: 27
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CEL 43: Misfire

I have 97 TJ.
I had a check engine light with a code 43. Pep Boys analyzed it as a misfire in the #4 cylinder. The area around my #3 and #4 fuel injectors were dirty with dust and dirt buildup. I replaced those two fuel injectors and cleaned up the others while disconnected. I also tuned up the engine with a New cap, rotor, Champion plugs, new wires. A single code 43 shows up again (12,43,55). (12 is legit since I disco'd the battery while working on the injectors and replacing the headlight switch).
Code 43 technically means: Peak primary circuit current not achieved with maximum dwell time. Misfire detected in one or more cylinders.
I will get the specifics on a code reader during lunch. I had heard that some 97s and 98s had a bad batch of valve springs... Is there a way to tell if they're bad? (I'm sure if they're broken, I'd have many other bigger problems).
Or is this a matter of power output? battery, coil, alternator? or D.) all of the above?

My engine runs great. Maybe a ever-so-light vibration at idle. Engine start time while cold is 4-8 seconds. engine power seems fines. runs and drives 75mph just fine.

What is a good way to diagnose 1.) electrical output and 2.) bad valve springs in my own garage?

Looking for any thoughts or ideas.

__________________
Scott
SLC, UT
2003 Rubi - Stock... for now.
1999 Sahara 3" rough country, 33 ATs - Sold
1997 Wrangler sport, 4" teraflex, 35 MTRs - Sold
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