Daledammit
Member
- Joined
- Apr 5, 2004
- Messages
- 31
I've searched forums and checked every suggestion I found. Car will only make 10lb boost. All stock engine. So far I have
Quadruple checked the Y fitting on the hoses to make sure it's right.
Replaced all vacuum lines with silicone hoses. Everything is zip tied.
Checked fuse to boost solenoid. Bypassed the boost solenoid with no change
Ran smoke machine test. It was leaking at the vacuum block gasket and egr valve. Replace both. Passes smoke test now.
Will hold 20" vacuum at start up and 14-16" after warm up.
Has a vdo boost gauge, I don't trust the dash boost gauge either.
No check engine lights and light does work. Put a bad Maf sensor on to make sure it would come on.
Still has stock wastegate. When I disconnect the hose to it, it will make 20lb boost under throttle.
I purchased the car a few months back. Only made 7lb originally. Had a break in the map sensor line next to the passenger fender, fixed it gained 3lb boost but no change since then.
Car has 53k miles, runs fine and accelerates fine, spools quick but only to 10lbs.
Wastegate moves freely when disconnected from actuator.
I don't think it's the turbo or the cat converter as it will make boost if you disconnect the wastegate. No slack or play in the turbine shaft.
New longer intercooler hoses. Good clamps. Smoke tested the intercooler, it passed also.
I haven't replaced the wastegate but my thoughts were if it will hold 20lb with the line unhooked the spring is ok but I might be wrong, I'm open to any input at this point. I do have a turbonetics (grainger) bleeder valve I connected inline to try as an adj wastegate but it didn't change anything either. Took it out just to eliminate it as a culprit.
I don't have a scan tool to connect for data but I feel like this has to be something simple I'm overlooking.
Stock chip in place, I want to get it boosting correctly before I make any changes to the car. Less mods less problems to rule out.
Car doesn't feel like it's holding back or losing power, I've had a few Buicks before so I do think the boost is accurate from seat of the pants feeling, just can't figure out where I'm losing boost or why it's being bled off early if that's the case.
Thanks for any advice, hints, tips, or thoughts.
Quadruple checked the Y fitting on the hoses to make sure it's right.
Replaced all vacuum lines with silicone hoses. Everything is zip tied.
Checked fuse to boost solenoid. Bypassed the boost solenoid with no change
Ran smoke machine test. It was leaking at the vacuum block gasket and egr valve. Replace both. Passes smoke test now.
Will hold 20" vacuum at start up and 14-16" after warm up.
Has a vdo boost gauge, I don't trust the dash boost gauge either.
No check engine lights and light does work. Put a bad Maf sensor on to make sure it would come on.
Still has stock wastegate. When I disconnect the hose to it, it will make 20lb boost under throttle.
I purchased the car a few months back. Only made 7lb originally. Had a break in the map sensor line next to the passenger fender, fixed it gained 3lb boost but no change since then.
Car has 53k miles, runs fine and accelerates fine, spools quick but only to 10lbs.
Wastegate moves freely when disconnected from actuator.
I don't think it's the turbo or the cat converter as it will make boost if you disconnect the wastegate. No slack or play in the turbine shaft.
New longer intercooler hoses. Good clamps. Smoke tested the intercooler, it passed also.
I haven't replaced the wastegate but my thoughts were if it will hold 20lb with the line unhooked the spring is ok but I might be wrong, I'm open to any input at this point. I do have a turbonetics (grainger) bleeder valve I connected inline to try as an adj wastegate but it didn't change anything either. Took it out just to eliminate it as a culprit.
I don't have a scan tool to connect for data but I feel like this has to be something simple I'm overlooking.
Stock chip in place, I want to get it boosting correctly before I make any changes to the car. Less mods less problems to rule out.
Car doesn't feel like it's holding back or losing power, I've had a few Buicks before so I do think the boost is accurate from seat of the pants feeling, just can't figure out where I'm losing boost or why it's being bled off early if that's the case.
Thanks for any advice, hints, tips, or thoughts.