Ok well I have a 2001 Eclipse spyder gs with a code of po300 I've replaced all the spark plugs & wires as well as the fuel pressure regulator and ecm and mass air flow censor and checked the mounts

Asked by Apr 12, 2014 at 05:00 PM about the 2001 Mitsubishi Eclipse Spyder GS Spyder

Question type: Maintenance & Repair

And as well all the circuts are good it
only seems to want to missfire after
all this and costing me over 1,000 in
parts & service idk what it is please
Help..

5 Answers

105,725

Is it actually missing or just the check engine light is on?

2 out of 2 people think this is helpful.
105,725

http://www.obd-codes.com/p0300

1 out of 1 people think this is helpful.
455

P0300 is a random misfire. Meaning all cylinders are misfiring, Its something in common. 1. vacuum leak can cause this. you may have a high idle with a vac leak. 2. not sure on ignition setup on those cars, but if a single ignition coil is used this can be suspect as well as distributor cap and rotor. ( ignition misfire will present itself more so under engine load.) 3. A weak fuel pump, not common but i have seen it. (check fuel pressure should be around 50-60 psi) a clogged fuel filter is possible, but it would choke and stall while driving. check these things first. hope it helps. Pete

105,725

If it's just the cel then I would try unhooking battery for at least ten minutes. This will clear the code. Drive car and see if cel comes back on.

105,725

If it has a miss you can feel look at your coils. They tend to leave a carbon trace mark where they are arcing out. Also try some good fuel treatment. I use sea foam or CTC. Bad gas can cause a 300 code.

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