1998 Mitsubishi Mirage Code P300

ARCH7ANGEL

MEMBER
1998 MITSUBISHI MIRAGE
4 CYL
FWD
AUTOMATIC
140,000 MILES

For about 6 months now I keep getting code P300, multiple cylinder misfire. At one point I had the code for Cylinder 2 misfire and that one has cleared now. The only problem I have had with the car is it bucks for a few seconds after I stop and start again. It also has trouble accelerating. I have replaced the spark plugs, wires, distributer and cap. Recently I changed the injectors. Nothing is clearing this code. A few times I used the injector cleaned fluid and for a week or two I had no problems, but than the car starting bucking and having trouble accelerating. Any ideas on what could be causing this?

4 Replies

RASMATAZ

MECHANIC
75,992 POSTS

A P0300 Random misfire is normally caused by vacuum leaks and bad fuel

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Tuesday, June 1st, 2010 AT 4:24 PM

ARCH7ANGEL

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I have changed the fuel filter and I use the middle grade of gas, and almost always from the same gas station. How do you know if it is bad gas? And we did a qucik check for vacuum leaks and there weren't any.

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Wednesday, June 2nd, 2010 AT 6:58 AM

ARCH7ANGEL

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5 POSTS

Thanks. I just changed spark plugs for cylinder 2 and 3 and its working a lot better. I had the CEL cleared after this too. But yesterday it bucked twice and the CEL came on again. But other than that, the car has been running much smoother.

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Thursday, June 3rd, 2010 AT 7:05 AM

ARCH7ANGEL

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Like I said at the beginnig, we did all the normalr replacements. The spark plugs, wires, cap and rotor. But since it changed after swapping wires around, I went a bought new wires and plugs. The car is running better than I remember when I bought it.

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Wednesday, June 9th, 2010 AT 12:19 PM