Hi, I have the above problem - flat spot is around 3,500 RPM and then picks up and flies at 4,000 RPM and above. Idle speed is steady but misfiring (only when hot).

Car is new 2 months ago to me but dealer records show harness replaced 2003, O2 sensor and MAF 2004. Also coils replaced plus ECU coil output stage rebuilt by local inde late 2004). The OVP is the old part number but appears OK (fuse, contact and soldering all fine, voltages measure OK)?

I did the B service plus all fluids and replaced plugs and boots. Also read the codes and fixed a broken knock sensor lead which improved things a lot but, having driven another E320, this one ain't right! (swapped MAFs with this one and reset adapt - no change).

No codes from the reader now.

Cleaned and checked throttle flap, intake temp sensor, resonance flap clear and moves with vac. Cleaned up and checked fuel vapour recyc system (valve clear and "beats" OK, cleaned by Arthur D's WD40 method). Can't find any vac leaks.

Please advise what to check/look at next.....thanks!

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Regards,

Steve

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1995 E320 Coupe (125.052 104.992 722.369)