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Diagnose first Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Wed, 29 Nov 2000 11:38:36
In Reply to: Turbo Trouble!!, Jason S., Wed, 29 Nov 2000 11:19:09 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Diagnose the problem before you start worrying about where to buy parts. Human nature makes you think it's the most expensive thing that broke, when usually it's something simple and cheap.
If your turbo cut out suddenly, I would guess that it isn't the actuator linkage. The actuator extends to limit turbo boost. Normally it doesn't limit boost. To limit boost all the time, it would have had to stick in the limiting position. Possible, but not probable.
My first guess is that you popped a hose off somewhere. Does the car idle badly? If the problem occured as an 'event' while under boost, the boost may have just popped a hose off or split a hose. Do the simple things first- open the hose and look around. Any hose not connected? Grab and shake hoses - a hose may have come partially off a coupling. For example, the main air hose to the intake throttle body may have popped off, but it could still sit in about the right place, but now there's a big air leak around the body. Check hoses for cracks and splits.
If the car is idling poorly, I'd definately suspect a hose problem - poor idle is a sign of an air leak. Wiggle hoses while the car idles to see if it gets worse- if it does, check that hose carefully. Remove the right front turn signal assembly and look in. You'll see the evaporative system charcoal canister there. Make sure all the hoses are in place. They like to pop off under boost, and you can't see it because it's buried in the fender.
Check the hooter (aka turbo bypass) valve. It's a black plastic cylinder, about 2 inches in diameter. It's got one thin hose and two thick hoses on it. Pull the thin hose off the intake manifold (engine off) and suck on it. It should hold vacuum. It actuates a diaphram in the hooter valve. Sometimes the diaphram splits. If you can pull air through it easily, replace the valve.
It is possible that the APC valve may have stuck closed, but that would normally just give you base (halfway into the yellow) boost.
I'll bet it's a pretty simple problem. It usually is.
Good luck!
, Wed, 29 Nov 2000 13:10:23, Wed, 29 Nov 2000 11:38:36 <-- Viewing This Message
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