Posted by Ronan on Sunday, January 21, 2001 at 6:10PM :
In Reply to: Re: 79 W200 PowerWagon W/350 california SMOG/engine ID questions posted by The Dodge Boys on Sunday, January 21, 2001 at 3:43PM :
Bill:
Yes this helps; I thought that was how the EGR worked, at 2-3000 RPM, dumping manifold vacuum to the valve. The smog shop said "EGR signal" which means they did not detect any vacuum at all at the valve.
I looked at the vacuum in more depth today, and found that I think the vacuum amplifier is bad; connecting it to the EGR port (a venturi signal I think) on the edelbrock, and I have about a 5" vacuum there at idle, enough to open the EGR valve and make it idle rough. I don't know how a vacuum amp works in detail, but I think it should not leak vacuum at idle. BTW the "input" to the amp from the carb was 0" at idle, with a narrow range 2000-3000 RPM so I thought maybe this was correct.
Since I discovered this leak, I simply put the EGR valve directly to the carb EGR port. I found the Vacuum amp is not available from Chrystler, so I hope this entitles me to a smog waiver.
There is a vacuum solenoid valve that I also have disconnected; ok I think cause it only disables EGR operation on a timer during first 30-40 seconds of operation.
I'm not really worried about the CO -- as youo say leaning out the carb; but I verified this motor is a 78 in a 79 body, and has a RV cam with the note "OFF ROAD ONLY"; I hope this does not cause higher CO at idle.......
There is NO smog diagram on this vehicle which makes it hard -- more difficult to determine what is really needed with the mixture of engine/body. I guess the "smog god" (the calif. smog referee) can determine what I need, or if I am eligeable for a waiver.
What it comes down to IMHO is what works! and I don't have tools to check smog so I have to guess.
If you have any ideas based on my ramblings I'd appreciate them! Thanks, ronan
|
This board is powered by the Mr. Fong Device from Cyberarmy.com |