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Bad Gas and Cyl #4 misfire
Posted 01 April 2004 - 11:44 AM
This one however has the mechanic and me a little perplexed. My wife's 96 OBW 2.2 5 speed 152K miles had a CEL come on. It ran fine but had a little hesitation occasionally. I made an appointment with our mechanic but since the car wasn't dead with it's tongue hanging out we kept driving it as we need 2 cars. The light was still on hesitating occasionally and sometimes the CEL would blink.
Just to make sure the mechanic got the codes pertinent to our current problem I disconnected the battery to clear al the codes. The CEL came back on and we dropped it off at the mechanic. He checked the code and it was a cyl 4 misfire and that was it. He checked injector resistance, pulled the plug and it was as clean as could be (only had 4,000 miles on the plugs, air filter, PCV, and fuel filter). He cleared the code and let it idle waiting for it to come back on. He let it idle for 2 hours and it never came back on.
Frustrated he told me to pick the car up and see if it would come back on again. Seeing that the plug wires were original I stopped at the stealership and picked up new plug wires, what the heck it was beyond time anyway.
The car ran fine for about a day and the CEL came back on. Same code. That was Saturday so we drove it for a couple of days. Just for giggles I put a bottle and a half of isopropyl gas line antifreeze in the tank and topped it off. (As a habit I put a bottle of isopropyl gas line antifreeze in the tank about every 2 to 3 weeks year around).
I told my wife I wanted to drive her car and see what was going on myself. I drove to work Monday and the car ran rough and the ECL light blinked as I drove it. After about 20 minutes it smoothed out and has been fine ever since. The ECL turned itself off after 3 cold starts and has been the smooth running machine it always has been.
Now, the $64,000 question. Why only the #4 cylinder misfire code? Obviously it was bad gas. The mechanic asked that early in the problem but I had told him no, it happened before the previous fill up. I was wrong (not the first time)! Why not #1, #2 or #3 cylinder misfire? Why always #4?
The important thing...the car is now running great!
Thanks for any input,
Posted 01 April 2004 - 06:26 PM
With the pressurized FI we have now, vapor lock may not be a problem, but I would hold off on adding anthing except FI cleaner and see if it helps.
Posted 01 April 2004 - 07:23 PM
Posted 01 April 2004 - 08:12 PM
Still can't figure out the #4 cylinder code and nothing else.
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