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RX8 stall at idle and run too rich

Old 09-12-2016, 09:12 AM
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RX8 stall at idle and run too rich

Hello evereyone.

I post my problem here because Iíve search for weeks now and canít figure what my problem is.
Lets start with the beginning of the story.
I had to rebuild my engine, I change it all and streetported it. I put everything back in place and start the engine. The engine start and keep stalling. Rookie mistake, I forgot to reset the PCm for the shaft sensor. It was better but still stall at idle, rough idle. Another rookie mistake was found, I inverted fuel injectors wires. Still no resolve the problemÖ
I know the PCM need some time to learn how to fuel the car so I decided to drive it around the block but it show me another problem, everytime I push the gas pedal it struggle for 1-2 sec and then it goes well (Iíll try to upload a video to show this soon), but everytime I get off my foot and put it back on the pedal, it will do that.
Driving it comes also with a lot of backfire. I check the plugs and theyíre black, so itís sure, the car run too rich!

I looked over vaccum leakage, found nothing, check the ignition (D585 coils) theyíre good, I took my compression, 100km after the rebuild and I got 105-107PSI for all faces and front and rear, so not really great but not bad at all I guess!
So now I donít know where to look up to find the problem.. For me it may be a sensor trouble, may be the MAF or the throttle body, Iím waiting for remplacement parts but Iím scared it wonít be that..

About my setup : D585 ignition coils and wires, NGK plugs. K&N air filter, and a full exhaust from toyosport (decat pipe). I donít change those during the rebuild. I just add a oil pressure regulator during the rebuild.

If anyone have a clue for me to solve this problem, Iíll take it!


Thank you in advance and sorry for the bad English!
Mc2g is offline  
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