Misfire and lean cyl 2 rich cyl 4
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Joined: 05-10-09
Posts: 37
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From: toronto
Misfire and lean cyl 2 rich cyl 4
So, as the title says. I had a misfire code for cyl 2 that would appear on cold a start and randomly disappear on its own, sometimes it would stay on for a day or a few days but would always diappear on its own.
I took it to my mechanic and he said it was lean and melting the plug on cyl 2 and rich on cyl 4. He replaced the plugs and switched the coil packs between cylinders and gave it back to me to drive and bring back so he could get a better read on the plugs.
A week went by and it misfired once more on a cold start, so I brought it back and he said the plugs were a little dirty but could find nothing else wrong and wants to do some more research and gave it back. Since then it has not misfired again.
He seems to be concerned about the carbon build up on the cylinders as he says they look "sloppy" but says the valves look ok.
I had the valves cleaned by Powell and the oil seperator installed a year ago.
The car is bone stock it has around 114k Km's, I only run Petro Canada 94 oct and I do not track the car.
With all that said I'm just looking for as many opinons as I can get on what the issue could be.
I took it to my mechanic and he said it was lean and melting the plug on cyl 2 and rich on cyl 4. He replaced the plugs and switched the coil packs between cylinders and gave it back to me to drive and bring back so he could get a better read on the plugs.
A week went by and it misfired once more on a cold start, so I brought it back and he said the plugs were a little dirty but could find nothing else wrong and wants to do some more research and gave it back. Since then it has not misfired again.
He seems to be concerned about the carbon build up on the cylinders as he says they look "sloppy" but says the valves look ok.
I had the valves cleaned by Powell and the oil seperator installed a year ago.
The car is bone stock it has around 114k Km's, I only run Petro Canada 94 oct and I do not track the car.
With all that said I'm just looking for as many opinons as I can get on what the issue could be.
Last edited by Mr.psychopath; May 26, 2015 at 11:23 AM.
Senior Member
Joined: 09-02-09
Posts: 4,210
Likes: 2
From: Wisconsin
Leaky injector? Do a fuel pressure bleed down test.
Attach a fuel pressure gauge.
Turn key to "ON" (Do not start)
The Pump should kick on and pump the presure up to like 50 or 60 psi.
Once the pump kicks off, watch the gauge and see how fast it bleeds down.
If you have a leaking injector it MAY bleed down too fast.
I forgot what the specs are for it, but i think it has to stay above 45psi for one minute to "pass"
Attach a fuel pressure gauge.
Turn key to "ON" (Do not start)
The Pump should kick on and pump the presure up to like 50 or 60 psi.
Once the pump kicks off, watch the gauge and see how fast it bleeds down.
If you have a leaking injector it MAY bleed down too fast.
I forgot what the specs are for it, but i think it has to stay above 45psi for one minute to "pass"
Member
Joined: 04-18-14
Posts: 376
Likes: 0
From: Dunnville, ON
Are you running an aftermarket intake? And if you are, have you tuned the car for that intake.
I had a similar problem with random misfires when starting the car when it was cold and damp out, the MAF wasn't calibrated for the intake, once I fixed that the random misfires went away.
I had a similar problem with random misfires when starting the car when it was cold and damp out, the MAF wasn't calibrated for the intake, once I fixed that the random misfires went away.
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