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Originally Posted by starfiresx
Hello all, found this site looking for info on EGR valves.
I have been having this like hesitation/missing problem on my 94 k1500.
now onto the EGR valve. I was told to try to disconnect it, and plug the port on the TBI. still the same.
so I took a vacuum pump with a gauge to my egr valve and it will not hold vacuum. should it? I believe so!
I am guessing it is bad.
I will be replacing the EGR valve ASAP.
any advice is appreciated. thanks Joe
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Hi Joe,
I don't think the failure to hold vacuum is bad.
My wife's car a 91 Caddy STS, did the same thing so I bought one from the dealer.
The new one was the same, Therefor I didn't install it and I asked a knowledgeable mechanic about it. He said they use exhaust pressure plus vacuum to open them currently. The original ones a number of years ago did just hold vacuum and you could suck them open.
Luckily the dealer parts counter actually took it back and no restocking fee either.