another car running rich

[GTIR_Dan]

my car is running very rich but only when above idle. At idle the air fuel ratio is spot on at 14.5:1, then as revs increase, richness increases and it goes right down to 8:1 and wont really rev above 5000 and only made 190bhp .

Ive done a diagnostic check and it shows nothing.

Ive also changed the MAF for a known good one, and re-earthed it and the problem is still there.

Any ideas?

 

[Fusion Ed]

How do you know its going to 8:1? Quite often that would be so rich the engine simply wouldn't fire.

 

[GTIR_Dan]

had it on a dyno yesterday to check the air fuel ratio as it was going up through the whole rev range under load

 

[GTIR_Dan]

can anyone help?

 

[snoon]

faulty knock sensor?

 

[Animaldaz]

Check your fuel pressure and get the injectors tested.