AZDSM
15+ Year Contributor
- 80
- 5
- Sep 1, 2006
-
Fort Hood,
Texas
So when I first bought this car last year around May, it drove home fine. Built boost and pulled hard. I pretty much tore it down from there as I saw a lot of crap I wanted to replace I wasn't ok with. Compression test last July came back good. It's a 2.3 stroker, but numbers were 160 across the board. Skip to summer this year is when I finally got around to getting things worked out with a few parts and was able to fire her up. Everything sounded and looked good, but it obviously wasn't.
When I first start it up from a cold start, AFR will look good, but after about a minute will dip into 15-16 area and pretty much stay there. Idle as of now is around 1600rpm. Now it would sound like it is a bad boost leak and from everything I've read, would agree. My boost gauge sits at about 15 vacuum on idle and when I give it any amount of throttle it will go to 0, but no more. The BOV makes a slight whirring sound. BOV worked fine last year before I tore the car apart.
- I've replaced a lot of gaskets. Turbo, j-pipe, both throttle, BOV.
- Fixed boost leaks at throttle gasket areas.
- Replaced BISS screw as it was leaking
- Vacuum hoses on TB were leaking. Fixed that.
- Replaced throttle cable with non-cruise cable as it wasn't allowing the throttle plate to close fully.
- Upper intercooler pipe going into TB was cracked. Had it welded.
- Fixed TPS sensor. Verified good through resistance check.
- Replaced IPS, verified good resistance as well.
- Wastegate DOES work. I've forced compressed air into the line to verify the flapper opens. It just doesn't do anything with any amount of load/throttle.
- Turbo is good. Even pulled it to check hotside.
- No blockage in exhaust.
- Power resistor is good.
- Injector resistance pack is good
- Coil packs are good, although one read high than what spec calls for (never got a yes/no if it should be replaced or not since it's not dead)
I've fixed so many boost leaks I honestly don't know what else to check at this point. Now admittedly, the boost leak tester I have isn't perfect. It does leak itself (..). I need to epoxy it and seal it so I can test my engine can hold the boost. But outside of that, I honestly don't know what to look for at this point. I can only think maybe the EGR is stuck open or my intercooler is seriously cracked somewhere not visually obvious with a spray bottle.
I need some ideas on what to do from here. Here is a pic of what I am working with.
When I first start it up from a cold start, AFR will look good, but after about a minute will dip into 15-16 area and pretty much stay there. Idle as of now is around 1600rpm. Now it would sound like it is a bad boost leak and from everything I've read, would agree. My boost gauge sits at about 15 vacuum on idle and when I give it any amount of throttle it will go to 0, but no more. The BOV makes a slight whirring sound. BOV worked fine last year before I tore the car apart.
- I've replaced a lot of gaskets. Turbo, j-pipe, both throttle, BOV.
- Fixed boost leaks at throttle gasket areas.
- Replaced BISS screw as it was leaking
- Vacuum hoses on TB were leaking. Fixed that.
- Replaced throttle cable with non-cruise cable as it wasn't allowing the throttle plate to close fully.
- Upper intercooler pipe going into TB was cracked. Had it welded.
- Fixed TPS sensor. Verified good through resistance check.
- Replaced IPS, verified good resistance as well.
- Wastegate DOES work. I've forced compressed air into the line to verify the flapper opens. It just doesn't do anything with any amount of load/throttle.
- Turbo is good. Even pulled it to check hotside.
- No blockage in exhaust.
- Power resistor is good.
- Injector resistance pack is good
- Coil packs are good, although one read high than what spec calls for (never got a yes/no if it should be replaced or not since it's not dead)
I've fixed so many boost leaks I honestly don't know what else to check at this point. Now admittedly, the boost leak tester I have isn't perfect. It does leak itself (..). I need to epoxy it and seal it so I can test my engine can hold the boost. But outside of that, I honestly don't know what to look for at this point. I can only think maybe the EGR is stuck open or my intercooler is seriously cracked somewhere not visually obvious with a spray bottle.
I need some ideas on what to do from here. Here is a pic of what I am working with.
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