Engine/Transmission (1998.5 - 2002) MAP sensor = low boost??

[DuallRam]

My 3rd lift pump was shot. I installed a FASS. Nice install. 15lbs fp now. I thought the low boost was because of low fuel pessure,Boost still only 26lbs. Could changing the map sensor really help that much with boost? I checked all the hoses. They all seem fine. Thanks

 

[DuallRam]

BTW, the truck definatly seems down on power. I also did the turn the key three times and I dont get any codes.

 

[Tcolesanti]

Check the wastegate, might be hung open causing boost to drop off. Maybe check all your connections for the boxes, use a little dielectric grease on them.

 

[HBarlow]

A year ago, on a trip back from Las Vegas pulling my TT, with about 95k miles on the odometer, I experienced low power, could not achieve full boost, and boost was lower than normal at every rpm. Stated another way, I could only build about 20 psi of boost instead of 30 psi and boost occurred late. I could not cause black smoke with a heavy foot. A new MAP sensor corrected the problem.



Harvey

 

[DuallRam]

Looks like Im tring a new map sensor then. Ill post the results

 

[skillsaw]

Map sensor do the trick??

I have same symptoms...



Thanks,

-Erik

 

[DuallRam]

No, that wasnt the problem. I guess it is somthing with the turbo.

 

[skillsaw]

sorry to hear..... keep us posted, good luck. I hope that's not my case.

-erik

 

[DStrong]

I don't think i have ever seen more than 25 to 27 psi boost with my truck. What is normal for a 2001 stock truck?

Dave

 

[HeavyHauler]

You're not going to see any more than 19 or 20 with a stock truck; I believe the wastegate is set at 20. 5psi.