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shawn99corolla
Novice
Sep 6, 2014, 3:40 PM
Post #1 of 6
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99 Corolla Misfiring
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Issue with 99 Corolla CE with 147,000 miles....I have a misfiring P0303 Code - Cylinder #3 Misfire. Here is what has been done in effort to remedy the misfire. A major tune up, new spark plugs, new fuel injectors, new spark plug wiring, The car runs fine once warmed up but in the morning the engine vibrates until warm and also shivers a little while the car is stopped at a stop light. I have dropped it off at the mechanics a couple of times now to no avail. Once the code is reset it will not display the CEL for couple of days but the symptoms still remains. The CEL comes back on within 2-3 days with same code. Really frustrating! Well at least this time CEL in not flashing like before it comes on and stays on. Any ideas what can still be causing the misfire. I really appreciate your help. Thank you in advance.
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Hammer Time
Ultimate Carjunky
/ Moderator
Sep 6, 2014, 3:45 PM
Post #2 of 6
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Re: 99 Corolla Misfiring
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Your problem isn't the light being on, it's the misfire that causes the light to come on so stop resetting it.
First step should be a complete compression test. That should have been done before throwing all those parts at it.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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shawn99corolla
Novice
Sep 6, 2014, 4:17 PM
Post #4 of 6
(1496 views)
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Re: 99 Corolla Misfiring
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Thank you I will ask the mechanic to do a compression test. One more thing and that is I am still getting around 30MPG even with this issue. What can cause a bad or low compression? And what might remedy the low compression? I don't want to spend anymore unnecessary monies as I have already spent $700 plus into resolving the same issue. ugg!
Thanks
(This post was edited by shawn99corolla on Sep 6, 2014, 4:19 PM)
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Hammer Time
Ultimate Carjunky
/ Moderator
Sep 6, 2014, 4:44 PM
Post #5 of 6
(1485 views)
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Re: 99 Corolla Misfiring
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If you find low compression on that cylinder, that will pretty much be a death sentence for that engine. That's why it should have been done first before spending all that money.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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shawn99corolla
Novice
Sep 6, 2014, 4:54 PM
Post #6 of 6
(1482 views)
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Re: 99 Corolla Misfiring
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Oh Man  thanks. I hope its not that. I don't know why the mechanic didn't start there. In the beginning I specifically asked him to do just that but he seemed to think it wasn't a compression issue. Anyways thanks. And sorry about the duplicate post, new to forum my mistake.
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