Extreme rich condition
 

Before any work was done and before the plenum was removed, the motor ran extremely rich. After talking with Marc and Jerry, I removed the plenum and eliminated the complete secondary system. I replaced all the injectors with FIC ones and the fuel pressure regulator with Jerry's new and improved unit (which I have to say is a work of art). The prom was re-calibrated by Marc and a resistor was installed between pins B22 and C18 on the computer which got rid of the code 66 that I had. I now have NO codes but still have the extreme rich condition. I suspect a failed sensor or vacuum leak but with all the vacuum stuff removed and ports capped off, I am at a loss. Any ideas?

Re: Extreme rich condition
 

How are you detecting the rich condition? Are you using a scan tool? if so, do you have logs?

Re: Extreme rich condition
 

https://www.zr1.net/forum/showthread...ght=OBD1+codes

What's a code 66?

Re: Extreme rich condition
 

A code 66 is a power fault for the valet switch.

Re: Extreme rich condition
 

I do not have a scan tool but what I did was jump the terminals A and B in the ALDL connector and it showed no fault codes, only the code 12. All the plugs are black and sooty and the exhaust is very black and rich. I can't let it run very long as it smokes us out of the area.

Re: Extreme rich condition
 

Have u checked coolant temp sensor, not the gauge sensor?

Dynomite,

Need to add Code 66 to ur list of MALF in stickies.

Re: Extreme rich condition
 

No, have not checked the coolant sensor. Can I do that without removing the plenum? It is rich right at startup.

Re: Extreme rich condition
 

Were the FIC injectors new or rebuilt?

Re: Extreme rich condition
 

I assume they were new as I bought them from Jerry and I am sure he would have told me otherwise.

Re: Extreme rich condition
 

Also, have u looked at Fuel Pressure Regulator. Can u put an FP gauge on the right hand fuel rail?