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Re: Where is BPV, Intake Rail and AMM on 9000CDE?  1 Saabers Like This Post!
Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Tue, 13 Jan 2009 20:59:27
In Reply to: Where is BPV, Intake Rail and AMM on 9000CDE?, Lee Harris, Tue, 13 Jan 2009 17:21:11 Members do not see ads below this line. - Help Keep This Site Online - Signup |
From a previous post I see you have a '93 - that's more important than the model.
A few questions - when the turbo kicks in, where does the boost needle go before it shuts down? Does it go to the edge of the yellow/red, or does it bury well into the red?
Spark plugs - what kind? They MUST be the NGK's specified in the manual. You MUST gap them per the manual - a little on the tight side (just under 1 mm / 0.040 inch) is best. The wrong plugs, worn plugs, or too wide a spark plug gap can cause bucking under boost. While you're in there, how do the plugs look? Do they look a nice light grey? (good) Fluffy black?(rich) Stark white (lean)?
The BPV is on the radiator, near the driver's side (LHD cars). Look for a cylinder about an inch in diameter with three thin hoses and an electrical connector, bolted to the top of the radiator. If the engine is overboosting (boost needle well into the red), make sure the thin hose that goes from the BPC (W line) to the wastegate actuator (under the turbo) is intact.
Look for the really fat hose with ribbing on the outside. One end goes up to the throttle body - metal, between the engine and firewall. Follow the hose and it will bring you to the AMM. The AMM is a plastic tube that clips in-line with the fat hose. The AMM has a box molded into it, with a connector. I would be very, very careful cleaning it. How did your advisor recommend cleaning it?
The fuel rail is on the top/back side of the engine. The very top of the engine has a red section (the Direct Ignition (DI) cassette). It nestles down on the valve cover - two horizontal metal pieces. As you move towards the firewall (windshield), you'll see the fuel injectors - four cylinders with electrical connectors, pointing down into where the intake meets the engine. Each fuel injector is plumbed into a metal tube (the fuel rail).
If you are overboosting (needle well into the red), then a bad BPV is a good possibility. If the needle stays in the yellow, it probably isn't the BPV.
If the spark plugs look very rich or lean (fluffy black or stark white), it could be the AMM. However, a bad AMM usually shows up as hesitation and a tendency to require a lot of throttle to get the car moving - almost as if the pedal is ignoring you. Rich running can be a bad Fuel Pressure Regulator (FPR). If only one plug is black, that's a stuck fuel injector. Lean running can be the AMM, but most likely is a vacuum leak. Look for hoses that are cracked, or have fallen off. No hose should be hanging loose, and be wary of a hose nipple with no hose. A very clogged fuel filter can cause lean running at high power (boost).
Again, how do you plan on cleaning the AMM? All you can clean is the platinum wire, and that is delicate. The common fault of an AMM is the internal electronics, and cleaning won't help.
It's important to better understand "when the turbo kicks in." The turbo actually kicks in pretty early - if the boost gauge needle is out of the white - even the very beginning of the yellow, the engine is boosting. High boost is at the end of the yellow.
I'm suspecting that the car is overboosting, and that kicks you into Limp Home Mode. That could be a bad BPV, a stuck wastegate actuator, or just the hose from the BPV to the wastegate actuator has fallen off or developed a leak. Please provide more information on the symptoms, and be as specific as possible (including the year of the car, transmission, etc.)
posted by 76.227.24...
, Tue, 13 Jan 2009 20:59:27 <-- Viewing This Message
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