"Lean" Club

[Petersho1]

Hey!
Engine running lean,AFR~15!
Cleaned MAF before dyno, Fuel pressure 40PSI, No codes KOEO,KOER, balance test 9=pass,so I'm thinking Injectors are clean, don't see any vacuum leaks! New sparks, sparks wire. Spark plugs are white/gray.
Any ideas?

Thanks for help!

 

[40BelowSummer]

welcome

headbang

 

[Petersho1]

BTW
Emission Test in Aril. What does it mean to lean engine?

 

[twr]

Too much air or not enough fuel or a combination of the 2. I'm guessing that the dyno showed that the a/f was lean?? Do you know what the ratio was?? or How do you know the engine is running lean??

 

[wood_e]

hieee, welcome to this growing SHO club.

See my "lean condition" thread.... (do a search)

I've narrowed it down to my MAF or my fuel pressure...

 

[Petersho1]

"Do you know what the ratio was?? or How do you know the engine is running lean?? "

AFR=air/fuel ratio is 14,5-15,5 is too much. Knock sensor had a "busy" time.

 

[twr]

With 40psi at fuel rail I would be looking for a vacuum leak or a dirty or out of calibration MAF sensor as the culprit. There are a ton of places for the SHO to develope vacuum leaks. That's where I would start.

 

[Petersho1]

agree, leaks oh
tryed different MAF, pro-flow 75mm, callibrated for sho, first 5 min. car runs great then CEL came-157 voltage is too low (cleaned!).