egr and ebt question
Elder User
Joined: Aug 2004
Posts: 932
Likes: 4
From: Edmond, OK
Vacuum ?
The EGR valve is electrically operated and provides electrical position feedback to the computer as well. The exhaust back pressure sensor is on top of stainless steel tube coming from the exhaust (located near front driver's side of engine); it is an electronic pressure sensor wired to the computer too.
No vacuum used for either.
The 04's have a throttle valve located just below the manifold air inlet elboe which plays into EGR strategy; the 05's have little scoops in pipes (IIRC).
If you unplug the EGR the PCM will know it and cause MIL on CA trucks but not the Federal emission trucks. The OBDII readiness test will not complete though (if anyone really cares) because the PCM determines EGR flow based on expected mass of air per engine load. Expected mass air flow minus intake mass air flow measured = calculated EGR flow.
Bob
No vacuum used for either.
The 04's have a throttle valve located just below the manifold air inlet elboe which plays into EGR strategy; the 05's have little scoops in pipes (IIRC).
If you unplug the EGR the PCM will know it and cause MIL on CA trucks but not the Federal emission trucks. The OBDII readiness test will not complete though (if anyone really cares) because the PCM determines EGR flow based on expected mass of air per engine load. Expected mass air flow minus intake mass air flow measured = calculated EGR flow.
Bob
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