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1994 chevy PU S10

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rapitup
New User

Oct 14, 2008, 7:32 AM

Post #1 of 4 (3731 views)
1994 chevy PU S10 Sign In
I have a 1994 chevy PU S10 v/6 136000 miles, all at once it stared idleing rough and the power brakes quit,I have look for vacuum leaks,(can't find any) replace the vacuum unit on the power boster,check the pvc unit(ithink that what it is) on the eng valve cover

When I pull the vacuum line off the brake power boster the motor run better but not right,when everthing hook up the motor sound like it's not getting enough air and trys to stall,The motor will rev up but misses.?????


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Oct 14, 2008, 7:43 AM

Post #2 of 4 (3727 views)
Re: 1994 chevy PU S10 Sign In
Hmmm? You are on the right track. Try plugging off supply to brake booster at the engine taking out any chances of it being the problem. There should be a "check" valve at the booster that could be a problem.

Thought: Any chance when it ran lousy that it fouled up a plug or two now messing up the diagnosis?

T



rapitup
New User

Oct 14, 2008, 7:56 AM

Post #3 of 4 (3722 views)
Re: 1994 chevy PU S10 Sign In
I've replace the check valve on the boster and took the vacuum line off the boster put my finger over the line and it trys to stall the motor,I have not put plugs in yet did'nt know that could miss up the diagnosis.is that the next step.also would plugs make the braks not work.?


(This post was edited by rapitup on Oct 14, 2008, 8:07 AM)


rapitup
New User

Oct 14, 2008, 10:30 AM

Post #4 of 4 (3707 views)
Re: 1994 chevy PU S10 Sign In
In Reply To
I've replace the check valve on the boster and took the vacuum line off the boster put my finger over the line and it trys to stall the motor,I have not put plugs in yet did'nt know that could miss up the diagnosis.is that the next step.also would plugs make the braks not work.?





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