A friend of mine just bought this car and we are trying to diagnose the no boost issue. I've spent countless hours reading through posts (ALL of them) about the waste gate swap, transducer troubleshooting, eds codes, over boost switch, etc.

First thing I did was check for vacuum to transducers. That all checked out. Then I made sure the lines were all plumbed right and that checked out. I then applied a vacuum to the EGR, the flapper, and the waste gate. Those all work as they should.

So my next step was to run a vac line from the waste gate to the cabin (to pull a vac manually on the waste gate.) Did that and had 14psi boost but the car still wouldn't get out of it's own way. So my next step was to bypass the over boost solenoid. I ran a line directly from the manifold to the ALDA. Yes, I know that I need to be careful doing this. Anyway, drove the car and it ran like a bat out of hell. I couldn't give it more than half throttle in any gear without it boosting past 15psi. My next step was to hook the waste gate back up to the transducer while leaving the over boost bypassed. Got back in, went for a ride and had 0 boost.

I built a nifty little pulse reader this afternoon to see what the EDS had to say. The very first time I checked it 9,3,2 in that order. I realized I left the plug off the MAF last night so we reconnected that then cleared the codes. I checked again and now I get 1 meaning no faults yet, I still have no boost. So in the meantime I'm going to check the over boost switch to make sure its not bad or dirty. Then I'm going to clean the lines going from it to the intake and ALDA. I am stumped as to why I have no boost though with no apparent problem or EDS code. I would really like to try to get this sorted without having to order a pressure actuated waste gate, etc. I'm not saying I don't want to do that mod it's just that we need to get this car drivable/reliable for cheap for the time being and then maybe tackle that project when it gets a bit colder.


Any help would be greatly appreciated.

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