won't stop running rich
 

At the GRM challenge we had what we thought was a injector stuck open, the AF went into the 8's

Well , I swapped to RC 370's (from 450 talons) and took out the resistor box... Still doing the same thing

Swapped the P28 (chipped with a basemap) to a stock P06.... Still Rich...


So the injectors and ECU's are good , but I can't get it to run at anything but mega rich.


Philstubbs ran the ostrich , disabled the O2 in crome , still rich , he was able to mod the fuel ratio , but not enough to lean it out, we could adjust the IAC with no issue either

what else could cause it to run so rich?


J.M
89 Si , Vitaras , TT rods , ARP's , Talon 450's , T04E , Gutted ...ect..ect

Re: won't stop running rich
 

Bad O2 sensor?

Re: won't stop running rich
 

I'd say with an 02 sensor or bad coolant temperature sensor?

Re: won't stop running rich
 

But I think that you could still lean it out if it had a bad coolent temp sensor.

Re: won't stop running rich
 

Philstubbs disabled the 02 sensor in crome when we were tuning it , it did nothing...

coolant temp sensor makes sense..

Re: won't stop running rich
 

even with a bad temp. sensor i would think you would still be able to get better ratios then 8's

Re: won't stop running rich
 

Just a thought....Whenever the 02 sensor for my wideband goes out, it always starts pegging out to the rich side....

Re: won't stop running rich
 

Yeah it seems like Bosch widebands like to go rich as they start to die.

If it's not that I'd check your fuel pressure regulator. On a Prelude I worked on the car would run in the 10:1 area when the car got hot and the regulator wouldn't open. When the car cooled down and the regulator worked it would run like it should.

Re: won't stop running rich
 

Checked your plugs to see if you really run that rich?

Re: won't stop running rich
 

FPR, replace it! Before you replace it make sure both vacum sources and the line are in good condition. How are you reading your AF? Maybe a bad wideband sensor.

Reading plugs FTW!