EGR

[lowtideride]

i saw somewhere i think it was a thread... i looked in tech but i did not see it... does someone know how you can by pass or shut down the EGR system using golf t's or any other way of doing it... i have a feeling that it is my problem because my cruiser runs perfect somtimes and super crappy somtimes its either or... and im running out of ideas and things it could be.. thanks -al

 

[dogboy]

ya, that was my "Caddy Shack Solution".....actually, it's more of a temporary diagnostic trick, to help narrow down and isolate the possible problem. As 60wag (and Landpimp I think) pointed out, it can actually create some more problems in turn if you run it rigged this way for too long.

disconnect the two vacuum hoses leading from the EGR Vacuum Modulator to the EGR valve and plug them. if it runs better than before, then at best you've identified a problem with the system of components that comprise the EGR. In my case, the EGR Vacuum Modulator is currently the biggest suspect with it's poor performance causing the EGR valve to not function properly.

Haven't messed with it since I got "teed" off with the thing, but should be getting back into it in the next couple of weeks. I'll post my misadventures and lessons learned when I do....

-dogboy- '87 FJ60

 

[lowtideride]

so what problems happen if you have the caddy shack method rigged tooo long???

 

[jeffroid]

I'm no expert, nor do I play one on TV, but I am compelled to share a couple of thoughts in regards to the EGR that come from personal experience. One is that if the EGR is stuck open, or if there is any debris stuck in it to keep it from closing completely, unhooking the vacuum hoses won't immediately solve the problem. On my truck, I had to beat on it to get it closed, and once I had it closed, having the vacuum lines disconnected kept it from opening again. The truck ran fine after that, and I later replaced the EGR.

Second, is that in another case, my truck ran much better with the EGR unhooked, but it turned out that there wasn't anything wrong with the EGR system. The Air Injection system (air pump and series of valves) was malfunctioning, and disabling the EGR apparently compensated somehow. I'm not suggesting that's your problem, it doesn't sound like it is. I have found that things interact, and the problem is not always apparent. Getting familiar with the emissions manual and performing system by system tests is the way to be sure. It can be intimidating at first, but you just have to be patient and stick with it.

 

[Trevor]

[quote author=lowtideride link=board=1;threadid=15072;start=msg142039#msg142039 date=1082442013]
so what problems happen if you have the caddy shack method rigged tooo long???
[/quote]

Won't the engine ping under load if you disconnect the EGR? Mine does. Also, the EGR reduces the exhaust temps. Less chance of burning valves if you leave it working.

 

[dogboy]

I have found that things interact, and the problem is not always apparent.  Getting familiar with the emissions manual and performing system by system tests is the way to be sure.

this is probably the best advice for your EGR issues. the "teed" off trick, like i mentioned above, will only show you that you have to get in there and dig until you find the real source of your woes.

got my emissions manual on order

-dogboy- '87 FJ60

 

[lowtideride]

back to square one..it seems..

 

[lowtideride]

anyone else know why my cruiser would run perfect somtimes and chit another>??