Hi all,
I have a 1992 Sierra 4x4 cossie and she won't boost over 0.4 bar and that's with the actuator rod wound all the way in. i have replaced the actuator the amal valve the spark plugs the dizzy cap.I took the turbo off and sent it to a specialist and he said there was nothing wrong with it. Please please please can someone help me as I'm about to pull my hair out and i can't afford to lose any more hair.

Thanks all.

 

have you checked for air leaks?

what spec is the car please?

did it just all of a sudden start or happened over a period of time?

 

Thanks for the reply,
Have checked all the hoses no leaks whatsoever, she has full silicone hose kit,running dark green injectors, stage 3 chip, escort big turbo, also i have printout from pJ motor sport that she was running 342.6 BHP on 7 aug 2007. It strated giving probs about 4 weeks ago with no warning at all.

 

i/cooler leaking? or the penny ISN'T closing properly on the turbo?? at a guess!

 

Thanks it's not the turbo could be be the intercooler will check it out. Cheers

 

sounds like a wastegate issue imo