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zoggnoff
User
Aug 10, 2009, 1:39 AM
Post #1 of 4
(7337 views)
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2003 Mitsubishi Eclipse GT 3.0L-V6
I have been getting these codes for a while now so I decided to replace the ignition components (new wires, plugs, cap and rotor)
the codes all came back and engine runs same as before.
Could an incorrect PCV valve cause a random misfire? (looks different than the original)
I put the EGR valve under pressure and it worked within specs.
the EGR tube did not seem to be cloged to me all though I didn't remove the entire piece so couldn't be sure.
I did not check the vacuum control valve or the egr solenoid (could these cause both the codes?)
The upper intake manifold and throttle body - new gaskets, torqued to specs, also the air assembly is tight.
(This post was edited by zoggnoff on Aug 10, 2009, 1:42 AM)
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DanD
Veteran
/ Moderator
Aug 10, 2009, 7:53 AM
Post #2 of 4
(7316 views)
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Re: p0300 & p0401
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There are more things that can cause a random misfire then the ignition system; even though it is the most common reason.. Have you checked the ignition coil’s maximum output; it should be no less then 25KV (25,000 volts).
Yes the wrong PCV could cause an intermittent misfire; likely a lean misfire; the valve might be drawing to much vacuum.
Other things are engine mechanical; low compression, worn valve guides, worn/loose timing belt, or just general overall engine wear.
The fuel system; low fuel pressure, low fuel volume, plugged or leaking fuel injectors, injector(s) beginning to fail electrically, injector drivers (computer).
The exhaust system; a converter partially plugged; as in the monolith catalyst inside the converter is breaking up into pieces and intermittently plugging up the outlet of the converter. This could also answer the EGR flow insufficient code?
Keep it fun; random multiple misfires can be a bugger to pin down sometimes.
Dan.
Canadian "EH"
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zoggnoff
User
Aug 10, 2009, 1:05 PM
Post #3 of 4
(7304 views)
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Re: p0300 & p0401
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I think it must have something to do with the cylinders in some way, when I replaced the ignition components I was able to do a compression test on all 6 cylinders
1st test:
(210) (180) (210)
(210) (160) (210)
each inital stroke started at 120 (less on the middle two cylinders) and jumped about 15 with each additional stroke until maxing out at those numbers.
I added oil to the middle cylinders and then tested (or wet tested), here is what i got
2nd test:
(210) (240) (210)
(210) (210) (210)
The service manual states that I should have 83psi - 119psi without vic
and 149psi - 212psi with vic (variable induction control)
by the diagram in the manual my car is the one WITHOUT VIC
engine uses a distributor so i thought i didn't have a coil
the 4 cylinder version eclipse there is a lot of talk about coil packs and no distributor.
am i wrong or does every car have an ignition coil?
thanks
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DanD
Veteran
/ Moderator
Aug 11, 2009, 3:26 AM
Post #4 of 4
(7292 views)
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Re: p0300 & p0401
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All Gas engines have some form of ignition coil. This vehicle's is inside the distributor.
Dan
Canadian "EH"
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