BEEVER
New Member
Ok I am having a leaning out problem with my 93. The plugs are white and there is lots of detonation on them. I am wondering if a 155 or 190 lph pump will help me solve this problem over the stock pump?
fuel press? lean condition
- Thread starter BEEVER
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Ok I am having a leaning out problem with my 93. The plugs are white and there is lots of detonation on them. I am wondering if a 155 or 190 lph pump will help me solve this problem over the stock pump?
SHO--ripper
928 Euro
Do you have a CE light? Your C&L may be causing your problem.
Axianator
I am a banana!
I'd be willing to bet that his lean problem was the combined result of his new "flow-increasing" mods (73 C&L, Stage 2's, and custom exhaust) and his LPM/EEC combination, which is most likely not programmed to account for the changes that have been made.
Out of curiosity, Beever, what EEC are you using for your new 3.2L setup - ATX or MTX?
Out of curiosity, Beever, what EEC are you using for your new 3.2L setup - ATX or MTX?
Dr. Tweak
Mad Scientist
Yeah bud, you're fuel pump isn't the problem, it's the amount of fuel that the injectors are feeding the engine. Get a real tuning device and go to work on it.
TwEECer RT baby
TwEECer RT baby
BEEVER
New Member
No c/e I can only tell by looking at the plugs
BEEVER
New Member
Out of curiosity, Beever, what EEC are you using for your new 3.2L setup - ATX or MTX?[/QUOTE]
Its a mtx X2J to be exact.
Its a mtx X2J to be exact.
Axianator
I am a banana!
Agreed with Jason. If you want to solve your lean problem, then you'll need need to recalibrate your PCM (ala TwEECer).
sdpatt
Sr. SHO Engr.
The fuel mixture in a modern, computer controlled, fuel injected engine such as the SHO's is the responsibility of the engine control computer and the sensors that provide it with inputs. If the engine had been running in a lean mode during closed loop operation, the oxygen sensor signals would have caused the EEC to generate a lean error code. A lean condition under full throttle, open loop operation is the result of higher than stock air flows that are not compensated by revised EEC programing. The earlier respondents tell you the truth regarding the need for farther tuning.
Not exactly true. Once you start opening up the engine to do something other than "bolt-on" modifications, the car will react strangley. When you start messing with cams, fuel pumps, etc, the car tends to run lean, period. With data logging, I could clearly see that the computer could not hit the commanded a/f ratios. While not lean enough to cause a code, it did run DANGEROUSLY lean enough to cause major damage during hard driving.
The only way I was able to properly fix this was to change the fuel slope and break points of the injectors. With cams, injector timing can play a role too. A half-as*ed way of doing it is to dump a lot of fuel in (unknown amount) via the Wide Open Throttle Fuel Multiplier. This is the way Vadim and Ted make up the fuel in a supercharged car. It is definitely not the way to do it properly. In that case, a wide band O2 is priceless.
The only way I was able to properly fix this was to change the fuel slope and break points of the injectors. With cams, injector timing can play a role too. A half-as*ed way of doing it is to dump a lot of fuel in (unknown amount) via the Wide Open Throttle Fuel Multiplier. This is the way Vadim and Ted make up the fuel in a supercharged car. It is definitely not the way to do it properly. In that case, a wide band O2 is priceless.
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