Fast answer needed: EGR Question
11-20-2003, 04:51 PM
#1
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Fast answer needed: EGR Question
How much should the motor idle RPM drop when the EGR diaphram is depressed?? It only drops 100 rpm on my car, and I'm wondering if this could be the cause of my rich condition??
11-20-2003, 05:21 PM
#2
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If I remember correctly, if you depress the diaphragm while the car is idling, it should kill the engine or go darn close to it.
Don't think this is the cause of your running rich though. If your car idles fine and moving the diaphragm doesn't change it much then the opposite is happening. That is, the valve is not letting enough exhaust gas back into the cylinder. Sounds like the port is clogged near the pintle.
Don't think this is the cause of your running rich though. If your car idles fine and moving the diaphragm doesn't change it much then the opposite is happening. That is, the valve is not letting enough exhaust gas back into the cylinder. Sounds like the port is clogged near the pintle.
11-20-2003, 05:53 PM
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Ok, so since my car is not shuddering/stalling, then the pintle that seals the exhaust off from the manifold isn't sealing, correct??? Could that pintle not sealing cause a loss of vaccuum and the computer to sense a "lean" condition, thus dumping xxx amount of extra fuel into the mixture, thus causing my rich problems???
11-20-2003, 06:20 PM
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Originally posted by Fastbird93
Ok, so since my car is not shuddering/stalling, then the pintle that seals the exhaust off from the manifold isn't sealing, correct??? Could that pintle not sealing cause a loss of vaccuum and the computer to sense a "lean" condition, thus dumping xxx amount of extra fuel into the mixture, thus causing my rich problems???
Ok, so since my car is not shuddering/stalling, then the pintle that seals the exhaust off from the manifold isn't sealing, correct??? Could that pintle not sealing cause a loss of vaccuum and the computer to sense a "lean" condition, thus dumping xxx amount of extra fuel into the mixture, thus causing my rich problems???
11-22-2003, 06:28 AM
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If I were you, I would check compression and if any show up lower than some others, I would then do a leak down test on those to see where the problem is.
You can also check ex manifold temp. This can be done with a pyrometer (IR thermometer) or with water and a spray bottle. Look to see if any one or more cylinders don't boil the water off the manifold pipe. Obviously indicating a cylinder not firing. Then check spark at that cylinder.
You can also check ex manifold temp. This can be done with a pyrometer (IR thermometer) or with water and a spray bottle. Look to see if any one or more cylinders don't boil the water off the manifold pipe. Obviously indicating a cylinder not firing. Then check spark at that cylinder.
11-22-2003, 06:38 PM
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It might be interesting to see a couple of things. Number one, try pulling off the fuel pressure regulator vacuum hose and see if it's wet indicating the diaphragm is ruptured and causing fuel to go into the intake through the vac hose. If that is ok check the pressure when the car is shut down. If it leaks down in a day then you may have a leaky injector.
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