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.

 

If you know you have a bad pump...change it.....

They don't majically heal themselves 😎

 

Yeah! I´ll try do change it by myself next weekend. If it won´t solved the problem, I´ll try a compression test.

 

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!!!!

 

Rotary specific compression test.

 

Yeap! Did this 2 years ago. More information: the coolant is OK, there isn't water/oil/unusual smoke in the exhaust, trembling in idle, temperature is ok.

 

A lot can happen in 2 years.

What were the results 2 years ago?

 

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?

 

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.

 

Have you had a look at this thread?

https://www.rx8club.com/series-i-tec...t-here-222280/

 

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.

 

Did a compression test and BINGO! Rotor 1 without compression.
Pay attention with rev limiter cut!

 

Hitting the rev limiter shouldn't do that . More likely the fuel pump issue or the clogged cat caused it .