high a/f on my nypex.

[nytro-king]

cant seem to find the problem on my tnypex the af is high on idle .runs fine the first second after starting the engine .then it starts dropping down.11-12,3 . have disconected the mcx intercooler. and check the tps,
any tips people.

 

[kinger]

It idles fine? Mine idles at 11-12 AFR no issues.

 

[nytro-king]

It idles fine? Mine idles at 11-12 AFR no issues.

yes. but at 2-3000rpm you can hear that its not running complete smud.

 

[TT]

Did you just install low comp pistons or a head shim? If so check your work - you might have skipped a tooth on cam sprockets. If you have not done any engine work and bought the engine used - do a leak down test to rule out valve issues etc.

 

[nytro-king]

mcx head shims.

 

[rxrider]

What you're saying... it starts to run rich after a few seconds of idle?

Will the sled run forward at all?

More details and we will be able to healp you out. Or did you fix the problem?

 

[nytro-king]

thats right. it runs on high af all the way. have new plugs and check't the fuel pressure. 42psi. shouldtn it have 36psi?.

 

[rxrider]

AFR guideline:
Idle speed = 14.0-14.7
Take off = 13.5
0 lbs boost = 13.0
5 lbs boost = 12.5
10 lbs and up = 11.8-12.0

Does your sled move forward, will it run?