5-90
NAXJA Forum User
- Location
- Hammerspace
Thanks for the input, Haven't done the egr delete per se, I have cut and plugged the vacuum line between the transducer and the valve. Preventing the valve from opening except maybe with a huge amount of exhaust pressure. Not sure if thats correct but thats what I've done. Did notice that when you give it sudden throttle there is a huge hesitation no matter the temp.
Pulling the vacuum line effectively blocks off the EGR - exhaust pressure building up behind it tends to pull the pintle shut, not push it open.
Rich sounds like a vacuum leak or some other issue. And, if you've been running rich enough long enough, you're going to be looking at the porous ceramic in the HEGO sensor tip being plugged up anyhow (which will cause it to "fail over" into Open Loop mode anyhow - making it run rich.)
I don't want you to throw parts at it either, but I'd say to do the following:
Disconnect the cat (driveway)
Remove the plugs and brush them off (a dry toothbrush should take care of carbon deposits readily.)
Reinstall the plugs.
Run Seafoam (or cleaner of choice - even water spray) down the intake and blow out any loose carbon.)
Recheck plugs - they should be cleaner this time.
Replace HEGO (you didn't do it earlier because you're going to be blowing around loose carbon.)
Reconnect cat.
Return to normal service for one week, and recheck plugs. They should, hopefully, be cleaner this time. Also take the week to re-evaluate fuel economy, and compare it to what you're getting now (it should, hopefully, be better.)
Leave the EGR disconnected from the vacuum source for the moment - no sense in adding additioinal carbon to the intake stream to screw up what you're doing. You can always reconnect the wretched thing later (principally to remain in compliance with EPA regs - damned thing does more harm than good on our engines anyhow...)
The RENIX system doesn't use a standard HEGO sensor, but a Bosch repalcement should still be well under $100 at the local.