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Re: Base boost versus high idle?
Posted by JohnK (more from JohnK) on Fri, 13 Sep 2002 15:03:44
In Reply to: Base boost versus high idle?, terraplanem, Fri, 13 Sep 2002 11:00:49
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As others have said, look for vacuum leaks including the hose that goes under dash to turbo gauge and pressure transducer. I would check the vacuum line to the hooter valve(black plastic valve just after turbo). Once you find this hose, pull it off the intake and suck on it a bit. It should hold vacuum.
I would also go though the entire turbo/intake plumbing and look for a cracked hose/tube or a bad hose clamp connection. Check the vac/pressure lines to the APC solenoid valve(up next to the coil). Make sure the hose from this valve down to the wastegate on the turbo holds a vacuum. You may have a leaky wastegate diaphram...aargh. Expensive, unless you get a used one. Also pull the electrical connector off this valve and take a test ride at max boost. This will give you a true base boost indication that you can compare to the reduced boost you are getting otherwise. I have a hunch that the reduced boost problem may not be true base boost. If these boost levels are not the same, you may be loosing partial boost through a turbo plumbing leak.
I also suspect as BurlyB suggested that your base boost is not right. You can hook a calibrated boost gauge into the vac hoses with a tee and see what youare actually getting. Should be 5.0-6.0 psi. If you set the wastegate right, your max boost should be right up to red or slightly into red.
posted by 216.75.9...
Posts in this Thread:
- Base boost versus high idle?, terraplanem, Fri, 13 Sep 2002 11:00:49
- Re: Base boost versus high idle?, JohnK, Fri, 13 Sep 2002 15:03:44 <-- Viewing This Message
- you gotta start testing this stuff..., burlyb, Fri, 13 Sep 2002 13:29:23
- I tested AIC, and ohm/voltage w/in specs, the TPS is, terraplanem, Fri, 13 Sep 2002 15:08:07
- Re: I tested AIC, and ohm/voltage w/in specs, the TPS is, Rob
, Sat, 14 Sep 2002 01:16:35 - Re: I tested AIC, and ohm/voltage w/in specs, the TPS i, burlyb, Fri, 13 Sep 2002 17:10:01
- Re: Base boost versus high idle?, Jon W, Fri, 13 Sep 2002 12:14:34
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