Weird Problem.
 

Ok guys i have a very weird problem with my MAP sensor. The car wouldn't go into boost and at 0psi when was about to put positive pressure it stumbled.I borrowed a MAP sensor from a friend of mine 2 weeks ago until mine arrives and it worked fine until today. I have the same problems except the car does not stumbles. It just wont go into boost, until i pop the hood and knock of the MAP sensor. When i do that the car is fine until it makes the problem again.

Btw the car is a 99 spec with the small MAP sensor the one on the right on the pic below. It's a 2Bar MAP sensor. Already changed the MAP sensor's plug as well. Also another strange thing is that the car boosts 1.1-1.2 bar for a year now which is not normal. I changed all the vacuum hoses and the car is stock except intakes and cat back exhaust. Why the hell it brakes the MAP sensors?

http://briefcase.pathfinder.gr/downl.../BOOSTSENS.jpg

Any help would be greatly appeciated.

does the car seem to bog when when accelerating quickly and boosting at about 2 psi or more?


And have you changed the spark plugs recently? just curious.

It stumbles and refuses to go into boost even if accelerating slowly Also the plugs were changed 6k miles ago. But if it was the plugs why is it ok when i knock the MAP sensor?

if the ecu is not knowing what boost the engine has it doesn't fuel cut that means its suppose to cut the engine down with a fuel cut when overboosting be carfull, or your zoom zoom will go kaboom :tear: .......and use the same map sensor they might not be the same, just a thought..........!!!!!!!!!!