gml7
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| posted on 12/4/11 at 09:16 PM |
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4age misfire is driving me mad!
I've got a 20v 4age in my Striker. It was running perfectly over the weekend driving along a main road until i slowed to a roundabout when it
started running roughly. It sounds a bit like a Subaru and is running like it at all revs the whole time now.
I thought it was a misfire and have been trying to find the problem accordingly. Initially when I unplugged 3 there was no change and when i unplugged
any of the others it stuttered. Now when i unplug 4 there is no change either, but when 1 and 2 are unplugged it still stutters. Does this sound like
a misfire problem? Could it be a mapping problem? Is there a diagnostic tool for omex ecus?
I have tried:
some other plugs from an old engine - no change
swapped the leads from 1 and 2 onto 3 and 4 - no change
tried another coil pack - no change
checked the compressions - all as per the engine manual
checked the timing wheel sensor is not loose or moved
running the engine with the air filters off
i opened the fuel tank but there didn't seem to be a vacuum
anyone got any ideas/help this is driving me mad!?
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adithorp
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| posted on 12/4/11 at 09:45 PM |
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Check the inlet manifold for an air leak either at the gasket or a vac' hose. Thats only thing that springs to mind given you've covered
most bases. A rubber hose pushed onto the end of a blow torch with the burner nozzel removed is good for finding a leak. Less messy than WD40 or
similar. Just move the pipe around the manifold and you'll hear the revs pick up when you're near a leak.
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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Agriv8
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| posted on 13/4/11 at 07:10 AM |
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couple of others that spring to ming
1 has wirring moved ? trigger wheel sensor wire picking up interferance ( is it sheilded )
2 bad earth on ECU.
Taller than your average Guy !
Management is like a tree of monkeys. - Those at the top look down and see a tree full of smiling faces. BUT Those at the bottom look up and see a
tree full of a*seholes .............
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MikeRJ
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| posted on 13/4/11 at 09:18 AM |
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Injection or carbs? If injection are number 3 and 4 injectors operating?
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gml7
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| posted on 15/4/11 at 06:42 PM |
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Thanks for the ideas and help! Going to try them over the weekend.
Its injectors, i switched 3 and 4 early on in the problem solving but i will try switching them with 1 and 2.
The earth on the ecu is something i considered as i've had some trouble with interference from the indicators effecting the speedo and rev
counter on the same journey but i wasnt really sure how to test the earths. I tried to wire directly from an earth point to the battery but couldnt
tell if it made any difference.
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gml7
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| posted on 16/4/11 at 01:36 PM |
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Ok so it was a leak in the inlet manifold gasket. It now runs like normal!
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adithorp
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| posted on 16/4/11 at 02:05 PM |
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I don't like to say it but... I'm good! 
It's easier when you've given a good description and already covered most bases though.
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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