My Car Does Not Booost???

[Turbo Nicky]

My 1990 Eclipse GST does not boost and I have not idea why. I bought the car for $1000 and it sat for 7 years and it only has 53,758 original miles. I relpaced the throttle body, mass air flow, fixed waste gate, checked for intercooler leaks, fixxed vaccum leak. I'm at a loss of words now, beacuse car drives fine, but once you give it some gas and boost hit 0 on the gauge it starts to buck and back fire. We are leaning now toward the ecu, because the one in there is a noname ecu that was rebuilt, so we are thinking that the ecu is bad and is causing this problem.
I do have a E6K standalone halitech ecu system, but I do not know if I want to put it in the car, I already know that the standalone would fix the problem but I have heard that if I do the standalone I am going to put myself in a big money pit. I also heard that with standalone the car is not the same because basically all I want to do it boost the stock turbo and keep it as a every day car and I heard with standalone your car is no longer a every day car.

Thank you for replies
-Nick

 

[Avionixx]

Sounds like a boost leak to me.

 

[->PrOjEcTGS<-]

Have you checked the O2 sensor? Do you get a CEL? Find someone in the local area that has a data logger and put it on there to see if any sensors don't look right. Maybe your turbo is blown? I had one 14b that the turbine wheel fell off and got lodged in the housing. The compressor side still turned just fine though. You could have a bad pre turbo exhaust leak. Are you just looking at the stock POS boost gauge? Or do you have an after market one?

 

[EagleTSIawd]

yep, check the shaft play on your turbo. I was running a t3/t4 years back and out of the blue it stopped boosting, turned out the turbo had major shaft play up and down

 

[Turbo Nicky]

I got the pos gauge I am going to get a boost gauge but it's weird because it tries to build boost but just breaks up but I am going to check out the turbine and see what I can go.