Misfiring after fuel cut rev limiter
10-23-2016, 10:46 PM
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Misfiring after fuel cut rev limiter
Hi! I´m beginning here!
My 8 AT 2007 44K (no cat) misfired and stopped after reached the rev limiter. The car was towed to my garage. I changed sparks plugs, coins and wires.
The 08 still misfiring with detonation. The obd presents P2195 and P0171.
Another information: on the trip occurred 2 months ago, the fuel pump had heating problems after two hours traveling and began to fail and then stop. I expected to cool or supplied gas and returned to normal. After that I didn´t run longer journeys (more than 30 mi).
I think with the action of the fuel cutting system, the defect of the pump may have worsened.
I wait comments.
My 8 AT 2007 44K (no cat) misfired and stopped after reached the rev limiter. The car was towed to my garage. I changed sparks plugs, coins and wires.
The 08 still misfiring with detonation. The obd presents P2195 and P0171.
Another information: on the trip occurred 2 months ago, the fuel pump had heating problems after two hours traveling and began to fail and then stop. I expected to cool or supplied gas and returned to normal. After that I didn´t run longer journeys (more than 30 mi).
I think with the action of the fuel cutting system, the defect of the pump may have worsened.
I wait comments.
10-24-2016, 07:59 AM
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11-01-2016, 12:52 PM
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I changed the OEM fuel pump for a Walbro (hard job - the ring was very tighten), but the engine still misfiring!! Easy start in cold but itsn't start hot! Suggests for next step are welcome!!!!
11-01-2016, 01:09 PM
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11-01-2016, 01:24 PM
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11-01-2016, 02:01 PM
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11-02-2016, 07:53 AM
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You're correct! High rev in cold can kill the rotaries. I'm very atencious with that.
Results were in yellow zone (psi, 190 rpm):
Front: 90,84,83 Rear: 85,84,89
Before the issue happened (misfiring after reached rev cut limiter), no problems with hot start and misfires. Just a fuel pump failure (heated) after 2h running in a 3kmi trip.
I think that the rev cut lim could be the last hammering at the apex seal (engine). Need to do a compression test, but in my city there isn't a rotary compression test. What alternative test can I do?
Results were in yellow zone (psi, 190 rpm):
Front: 90,84,83 Rear: 85,84,89
Before the issue happened (misfiring after reached rev cut limiter), no problems with hot start and misfires. Just a fuel pump failure (heated) after 2h running in a 3kmi trip.
I think that the rev cut lim could be the last hammering at the apex seal (engine). Need to do a compression test, but in my city there isn't a rotary compression test. What alternative test can I do?
11-02-2016, 04:39 PM
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New discover: today started the car and idling for 15 min. Than accelerate per 2 min in 4-6 k rev and checked the cat wich was RED (could be clogged). This is a high flow cat. I have the OEM and will change it as soon as posible.
11-03-2016, 06:44 PM
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Dallas, I've looking the mentioned thread and unfortunely, I'm going to the problem *8 (low compression).
Bad news: today changed the cat and the problems remain. Next step: compression test.
Bad news: today changed the cat and the problems remain. Next step: compression test.
