Motor swap and error code...
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Joined: Dec 2003
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From: Vancouver, BC
Car: 87 Firebird (Hasselhoff special)
Engine: 2.8L of PURE STOCK POWER
Motor swap and error code...
I swapped out my original motor for one out of an 89 camaro. The camaro had all that air stuff on it. I took all of that off and put on my original exhaust manifolds. I also replaced the O2 sensor (it's a new bosch one). After driving for a while I now get the error code for EGR. I swapped the one off my orignal motor (it never set off code before) onto the motor but still get code. Could the 02 sensor be screwing me around? What else could be problem? Never had code on old motor.
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Joined: Nov 2002
Posts: 1,832
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From: Castaic, CA
Car: 1988 Camaro RS
Engine: 2.8L of Raw POWER!!!
Transmission: Stick Shift
Axle/Gears: 3.42's
A lot of people misunderstand how to diagnose this code. Our cars have no way of knowing if the EGR is in fact opening or not, all our cars see is that there is vacuum being applied to the valve.
Our cars have a vacuum hose going off to the EGR Vacuum solenoid which then goes off to a tee fitting. One hose to the EGR valve itself, and the other to what looks like a MAP sensor.
When the ECM says that the EGR must be off, the vacuum is vented out the back end of the solenoid, a kind of controlled vacuum leak. When it's on, it closes the solenoid, letting vacuum pass through to the EGR valve and to the EGR Vacuum Sensor.
These are the proper trouble shooting tips.
1. Check to see if there is vacuum to the EGR Solenoid. You want to hook up to the hose to the solenoid, from the manifold. if there is goto next step. if not, find out why and fix that.
2. Check to make sure that the EGR is capable of holding a vacuum. Attach your vacuum pump/guage to the egr valve and pump it up, it should hold. You don't have to do this with the engine running.
3. Check to make sure that the EGR valve is getting vacuum applied to it through the solenoid. Hook the vacuum guage up on the EGR side of the solenoid with a long vacuum hose and go drive around. You might also be able to get it to apply vacuum by powerbrakbing if it's an auto, but the driving around for a while will definitly do it.
If you get vacuum, then check the wiring and vacuum line to the EGR Vacuum Sensor(MAP-like thing) and repair if needed, if the wiring is OK, replace the Sensor.
If you don't get vacuum, then the solenoid is stuck and should be replaced.
Hope this helps you out a little.
Our cars have a vacuum hose going off to the EGR Vacuum solenoid which then goes off to a tee fitting. One hose to the EGR valve itself, and the other to what looks like a MAP sensor.
When the ECM says that the EGR must be off, the vacuum is vented out the back end of the solenoid, a kind of controlled vacuum leak. When it's on, it closes the solenoid, letting vacuum pass through to the EGR valve and to the EGR Vacuum Sensor.
These are the proper trouble shooting tips.
1. Check to see if there is vacuum to the EGR Solenoid. You want to hook up to the hose to the solenoid, from the manifold. if there is goto next step. if not, find out why and fix that.
2. Check to make sure that the EGR is capable of holding a vacuum. Attach your vacuum pump/guage to the egr valve and pump it up, it should hold. You don't have to do this with the engine running.
3. Check to make sure that the EGR valve is getting vacuum applied to it through the solenoid. Hook the vacuum guage up on the EGR side of the solenoid with a long vacuum hose and go drive around. You might also be able to get it to apply vacuum by powerbrakbing if it's an auto, but the driving around for a while will definitly do it.
If you get vacuum, then check the wiring and vacuum line to the EGR Vacuum Sensor(MAP-like thing) and repair if needed, if the wiring is OK, replace the Sensor.
If you don't get vacuum, then the solenoid is stuck and should be replaced.
Hope this helps you out a little.
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