Dangers of Blocking EGR

Submitted: Monday, Feb 19, 2007 at 08:21
ThreadID: 42467 Views:30870 Replies:4 FollowUps:21
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If you own a pre 2005 Nissan 3.0L Patrol and you have blocked off the EGR you need to read this. After hearing so much about this I decided to trial it for a few months on my 2003 3.0L. It all worked fine with the exception that at 110km/h on light throttle such as cruising along flat sections of hwy, where I do lots of kilometers, the turbo boost would drop to less than 5psi, where it use to sit around 8-12 psi. Initially I didn't think much of this until I read on other forums that when this happened their Exhaust Gas Temperatures (EGT's) were going well over 500C. So I borrowed a pyrometer and hooked it in just after the turbo but before the catalytic converter. On a trip from Whyalla to Adelaide (380km's) and back over the weekend, sure enough everytime the car settled in to 110kmh the boost dropped to less than 5psi and the EGT's started steadily climbing at one point reaching 540C. Reading other online forums some people had possible solutions, but they were talking about 'back-yard' solutions to try and fool the computer, which sounded like a recipie for disaster to me. So I have reinstated the EGR, figurring that sacrificing a small efficiency gain is better than destroying my engine. Will submit another post with fuel consumption figures in another couple of weeks.

Cheers

Snowy
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