Question about 1998 Mitsubishi Eclipse

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98Eclipse 2.0 nonTurbo 5speed 180,000 miles ,code PO301

New timing belt put on last summer after bearings in tensioners came apart. Was running fine,then started stalling out at red lights giving code for EGR insufficient flow. Put on new Autozone EGR valve and ran better,but check engine came on PO301. Had new plugs & wires on engine. Put on new power pack, not much different. Replaced #1 spark plug. Plug is not burning nice gray/brown like plugs 2-3. On this engine the resistence in OHMS of the plugs and wires must be closely matched on 1&2 AND 3&4 for the engine to run right. There is a intermitent miss at low RPM 1000-2500 when you accellerate, and CK ENG lite comes back on. At the worst,engine will miss and backfire(pop) when you accellerate. If you accellerate gently it is not too bad. Runs fine at high RPM 3-5K. Could it be a injector or fuel problem or back to wires & plugs????

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  • jhaydu Jan 05, 2009

    Have checked the compression of cylinder #1  and it is 175-180 lbs and holds. Now also gota PO420 code catalyst is below threshold along w/ PO301 #1-misfire. Engine now runs much better w/ resistance of plugs and wires closely ballanced. ANY OTHER IDEAS??? Car has been running OK for 6 months since timing belt replaced

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The po301 is a misfire code. The backfire can be caused by a excessive amount of fuel, bad valve timing etc.
My guess is you have damage to an exhaust valve that may have occurred when you had the timing belt problem.A compression test will indicate if you have a leaking exhaust valve.The reason for the backfire is the exhaust valve is still partially open when the spark plug fires.

Posted on Jan 03, 2009

  • my enine is not misfiring, the sound is very good but it occassionally fails to rev more than 3000rpm this will affect the gearbox not to change as the revvs will be low. I took it for dianosis check not fault code was picked.

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