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DoctorDex · 10-26-2006, 04:18 PM

I tried some other runs today, with and without the EGR connected. However, I didn't do back-to-back-to-back runs so there could other factors affecting the results. Here is what I found:

EGR connected with 7psi Boost - No lean condition
EGR connected with 12psi Boost - No lean condition
EGR connected with 16psi Boost - Lean rear bank

EGR disconnected with 7 psi boost - lean rear bank
EGR disconnected with 12 psi boost - lean rear bank
EGR disconnected with 16 psi boost - lean rear bank.

These results lead me to think that my EGR is leaking boost into my exhaust. The problem seems to be worse when I disconnect the EGR. With the EGR disconnected it _should_ be closed all the time, but this does not seem to be the case.

I guess the only way to confirm this theory is to do a pressure test and then unbolt the EGR pipe from the back of the intake to see if boost is leaking out of the EGR valve. I don't have time to do this at the moment, but I will try and get around to testing this theory next weekend.

Declan

10-26-2006, 04:18 PM	#20 (permalink)
DoctorDex Forum Member Join Date: Jul 2005 Location: Edmonton, AB Drives: '91 VR4 - RIP Trader Rating: (16)	Re: Intermittent Injectors on Rear Bank? I tried some other runs today, with and without the EGR connected. However, I didn't do back-to-back-to-back runs so there could other factors affecting the results. Here is what I found: EGR connected with 7psi Boost - No lean condition EGR connected with 12psi Boost - No lean condition EGR connected with 16psi Boost - Lean rear bank EGR disconnected with 7 psi boost - lean rear bank EGR disconnected with 12 psi boost - lean rear bank EGR disconnected with 16 psi boost - lean rear bank. These results lead me to think that my EGR is leaking boost into my exhaust. The problem seems to be worse when I disconnect the EGR. With the EGR disconnected it _should_ be closed all the time, but this does not seem to be the case. I guess the only way to confirm this theory is to do a pressure test and then unbolt the EGR pipe from the back of the intake to see if boost is leaking out of the EGR valve. I don't have time to do this at the moment, but I will try and get around to testing this theory next weekend. Declan __________________ '91 VR4 - Rebuild in progress: Mods TBA.