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Re: 85 Chevy Caprice. Restricted Exhaust ?
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CarGuru > Technology > Re: 85 Chevy Caprice. Restricted Exhaust ? 20 February 2005 17:58:38
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Re: 85 Chevy Caprice. Restricted Exhaust ?

User132384@Aol.Com 20 February 2005 02:04:09
 Last tune up was new spark plugs about 10K miles ago. Air filter is
pretty new ( less than 20K on it). Oil change every 2 to 4 K. Timing
set 30K ago. EGR tested OK last month at inspection.

Add comment
User132384@Aol.Com 20 February 2005 04:51:27 [ permanent link ]
 Bruce,

The manual that came with the vacuum guage said that if the engine
is revved and the guage reading heads toward zero then there could be
an exhaust retriction or an overactive egr valve.
When I rev the engine the guage reading does indeed head toward zero
(it instantly drops down 5 or 10 points , then rises again to 20, as I
maintain the rev ).
Perhaps the manual means to say that if the guage reading heads
toward zero and ** does not return to normal ** as you maintain the
rev, then there is a restriction.
Why it goes up to 25 when I let go of the throttle, I don't know.

No, I do not understand why vacuum drops when I rev the engine, but I
have read somewhere that it is normal.

Add comment
User132384@Aol.Com 20 February 2005 17:58:38 [ permanent link ]
 Edmechanic, thanks for that excellent explanation of how and why the
vacuum changes!

BBA, yes, I am rather obsessive about my vehicle maintenance. Keeps me
out of worse trouble, somewhat. I bought the car with 57K miles on it,
when it was 5 years old. The air filter was black with dirt, and the
oil was also black and thick, spark plugs were worn. So it might have
been neglected at first, but since then I've been taking good care of
it, yes.

Nate, thanks for the info about WOT.

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CarGuru > Technology > Re: 85 Chevy Caprice. Restricted Exhaust ? 20 February 2005 17:58:38
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