Engine/Transmission (1998.5 - 2002) Turbo won't spooll up

[HWestfall]

Can anybody tell me what may be the problem may be? I have a 02 3500 HO, sometimes when I am excelorating the Turbo won't spoolup like it should, in 2nd-4th the most boost I get is about 10 lbs at 2500. in 6th I only get about 18 lbs. It acts to me like the waist gate is not working correctly, is this possable? H Westfall

 

[Highfinance97]

Did you check your hose clamps????????



Michael

 

[LOtero]

sounds like a boost leak, do you hear hissing? check all your intercooler hoses, i had a leak in mine on the front passenger side right at the 6 o'clock position, boot was still on just slid back, so check em good.

 

[PC12Driver]

First things first, what are your egts doing? If it was a boost leak, then you'd have noticably higher egts and a bunch more smoke.



If the egts are normal or lower than normal, then you have a fueling issue. For example, if your MAP sensor isn't "seeing" the boost in the manifold, then it won't tell the pump to add more fuel. If you don't get the fuel, you don't get the boost. And you can have a bad sensor and not get the code.



If your egts are higher and you have more smoke, then start chasing down a possible boost leak/stuck wastegate/etc.



Did you do anything recently to the truck that could have started this? Do you run an exhaust brake (that will contaminate the MAP and IAT sensors)?