HELLO EVERYONE,


I HAVE A '95 850 TURBO, AND I INSTALLED A CATCO PERFORMANCE CAT, TWO NEW BOSCH O2 SENSOR (15738-UNIVERSAL) AND A DAWES AIR/FUEL METER, BOSCH DIST CAP & ROTOR. NOW, ON THE SPARK PLUGS, I WENT TO THE AUTO PARTS SHOP AND THE COMPUTER LISTED CHAMPION RC9YC PLUGS. I KNOW THAT MY CAR USES RC7YC......RC9YC BEING A HOTTER PLUG, COULD THESE PLUGS CAUSE MY CAR TO RUN LEANER ? THE REASON I ASK IS BECAUSE BEFORE THE PLUG CHANGE MY METER WAS INDICATING THAT IT WAS RUNNING A LITTLE ON THE RICH SIDE. WHICH IS PERFECT DUE TO MY MANUAL BOOST CONTROL. NOW WITH THESE HOTTER PLUGS I'M RUNNING LEAN AND I HAD TO DISCONNECT THE MBC. IF THE PLUGS ARE NOT CAUSING THE CHANGE, THEN WHAT COULD BE CAUSING IT TO RUN LEANER?


THANXS IN ADVANCE

 

It is possible but something sounds fishy.

 

What sounds fishy?? Is there something else you think may be causing it to run lean??

 

I never thought that plugs could cause that much affect.If you went from running a little rich to running lean that is weird.
Try to make sure your fuel pressure is the same as well.

 

Just cleaned the old spark plugs and reinstalled them. Nothing changed. I metered the 02 sensors and they are trying to adjust the mixture, and when my meter indicates a air/fuel adjustment (trying to go richer) I hear my air pump kick on and pumping air into my intake. So my o2 sensors are trying to do their job. Now when I first installed everything, the meter was showing a good mixture ( just alittle on the rich side ). It stayed like that for a full day. I'm wondering since my fuel gauge light came on right when everything changed and it went lean and stayed so. Could my fuel filter be causing a restriction and not allowing more fuel to reach my injectors? Can a fuel filter thats at the verge to go bad cause it to go lean? Also the a pressure release valve of sort on the right side of the injector assembly. it has a cap on it. I just tried to purge it and fuel came out. How hard should the fuel come out under the correct fuel pressure? Because it didn't just shoot out. It was more of a pour with alittle pressure behind it.....just a question I don't know much in this area...

 

It should have some pretty good pressure behind it.I would think it would be possible with the filter.
The fuel pressure should be at about 43 PSI (300 KPA)