Quote:
Originally Posted by kenny's 370z
after trouble shooting again after so long since i had given up,i tried something today that fixed my throttle issues after applying the brakes.i thought that maybe i had a bad brake switch also.
in my case,something inside my brake booster was giving the map sensor a bad reading with the vacuum.found out after putting a T on the brake vacuum hose at the i m and then running a hose to the map sensor by the brake booster and plugging the hose coming off of the brake booster that went to the map sensor.to my amazement,this worked.
i have said in the past by doing this and that it fixed my problem.what i was doing was making the car run richer until the computer compensated but the problem always came back.
since the map sensor is now bypassed from the brake booster.my problems with throttle problems have disappeared.i had all but given up on this car until today.this may or may not work for the people that cant figure their problems out with throttle problems either.its completely reversable and i have run the crap out of the car during my testing.
i also notice,my oil runs cooler and my gas mileage went up with normal driving.i know for a fact that the map sensor by the brake booster was making my car run lean as hell.it would smell like gun powder after i got on it.i dont smell that anymore either.i went from hating this car to loving it again.
so far,there are two culprits of throttle problems(excluding vdc) that i know of,brake switch and map sensor by the brake booster.one cuts throttle and one leans the car out
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i wont edit this post^ in case someone else wants to try it.dont waste your time.apparently,it IS my brake switch also.the brake switch that is farthest to the right(closest to the foot well ) is the one that kills cruise when you apply the brakes.
i adjusted this one out to where i dont have cruise atm.but guess what,by doing this,the computer no longer thinks im applying brakes when im not.so there it is.BRAKE switches.and i put the map sensor back to stock.car is running great.so if you want to try and trouble shoot your brake switch,take a 14mm open end wrench and loosen the switch im describing,unscrew the switch about an 1/8th of an inch,maybe more,then tighten the nut back down and go for a drive.
what i believe has happened in my case is the nipple is wore down on the switch that controls the brake lights and the other switch isnt letting the brake light switch be compressed all the way.drove this morning to work and back home for lunch and back to work with ZERO throttle problems and i tried to get it to show its ugly face again and wouldnt come back.and the car definitely feels easier to get rolling.