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427 ENGINE SURGE AT IDLE
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JLL
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Joined: 02 Jan 2012
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Location: MADISON NC
276.54 points



PostPosted: Mon Jan 09, 2012 9:42 am    Post subject: 427 ENGINE SURGE AT IDLE Reply with quote

Have,checked all that I know of on 427 engine that continues to surge at idle from 900 to around 13 to 1400.would a hole in vaccum line from carb to distributor cause this.
Thanks for help...
JLL
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Paul P
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Location: Townsend, Mass.
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1971 Chevrolet Chevelle

PostPosted: Mon Jan 09, 2012 1:47 pm    Post subject: Reply with quote

Welcome to SmokemUp. It could. A hole or tear in the vacuum advance diaphragm in the distributor could also cause it. Was this a sudden thing or always there?
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2001 Focus 2.0 Zetec
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1971 - Chevelle 408 SBC N.A.
6.95@98.6 MPH 1/8mi
10.97@121 MPH 1/4mi
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William Jones
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1971 Ford Mustang

PostPosted: Mon Jan 09, 2012 6:47 pm    Post subject: Reply with quote

Is this carbuerated or fuel injected? If its carbed I have seen power valves that are not low enough for the engines vacuum to cause surging problems also.

Bam

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Paul P
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1971 Chevrolet Chevelle

PostPosted: Mon Jan 09, 2012 6:54 pm    Post subject: Reply with quote

Good point Bam!
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2001 Focus 2.0 Zetec
15.63@87 MPH 1/4mi
1971 - Chevelle 408 SBC N.A.
6.95@98.6 MPH 1/8mi
10.97@121 MPH 1/4mi
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JLL
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Location: MADISON NC
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PostPosted: Mon Jan 09, 2012 7:37 pm    Post subject: Reply with quote

Paul P wrote:
Welcome to SmokemUp. It could. A hole or tear in the vacuum advance diaphragm in the distributor could also cause it. Was this a sudden thing or always there?
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clay
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Location: South Carolina
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1972 Chevrolet Nova

PostPosted: Mon Jan 09, 2012 9:04 pm    Post subject: Reply with quote

I have also seen centrifugal weight springs that were a little too light cause this. They would allow the distributor to advance at the higher idle speeds than the factory had in mind (probably 600 or so). Sometimes this advance can get the engine into a surging idle. Slightly stronger springs usually controls it. Clay
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I have done so much with so little for so long, I can now do anything with nothing.
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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Tue Jan 10, 2012 1:41 am    Post subject: Reply with quote

can you describe the surge ? is it a rapid surge or does the idle seem to intermittently go up and down ?
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af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

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af2
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Location: grassvalley, ca
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1933 Willys Coupe

PostPosted: Tue Jan 10, 2012 9:32 pm    Post subject: Reply with quote

JLL wrote:
Paul P wrote:
Welcome to SmokemUp. It could. A hole or tear in the vacuum advance diaphragm in the distributor could also cause it. Was this a sudden thing or always there?



The frustrating thing about this post is the quote you left as you did in another post after a couple of suggestions.
It seems we can look at our magical Balls and come up with a fix?

Braklean is your friend when looking for vacuum leaks. No flash.
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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Tue Jan 10, 2012 11:41 pm    Post subject: Reply with quote

af2 wrote:
It seems we can look at our magical Balls and come up with a fix?



stop stealing my pickup lines Laughing

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af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

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Paul P
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1971 Chevrolet Chevelle

PostPosted: Fri Jan 13, 2012 11:46 am    Post subject: Reply with quote

he said Balls Laughing
_________________
2001 Focus 2.0 Zetec
15.63@87 MPH 1/4mi
1971 - Chevelle 408 SBC N.A.
6.95@98.6 MPH 1/8mi
10.97@121 MPH 1/4mi
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10sec.et
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Joined: 29 Mar 2006
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1969 Oldsmobile Cutlass

PostPosted: Sat Jan 14, 2012 2:30 am    Post subject: Reply with quote

that was just too funny not to steal it for my sig Mr. Green
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af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

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Paul P
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Joined: 15 Aug 2002
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1971 Chevrolet Chevelle

PostPosted: Sat Jan 14, 2012 7:36 pm    Post subject: Reply with quote

Yes not your sig... Laughing
_________________
2001 Focus 2.0 Zetec
15.63@87 MPH 1/4mi
1971 - Chevelle 408 SBC N.A.
6.95@98.6 MPH 1/8mi
10.97@121 MPH 1/4mi
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af2
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1933 Willys Coupe

PostPosted: Sun Jan 15, 2012 1:25 am    Post subject: Reply with quote

That was the best I could come up with at the time. Laughing
Good sig Keith.
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Paul P
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1971 Chevrolet Chevelle

PostPosted: Sun Jan 15, 2012 1:42 am    Post subject: Reply with quote

This is way off topic now...
Surge, Magic Balls. Definitely going down hill.... Big Grin popcorn smoking

_________________
2001 Focus 2.0 Zetec
15.63@87 MPH 1/4mi
1971 - Chevelle 408 SBC N.A.
6.95@98.6 MPH 1/8mi
10.97@121 MPH 1/4mi
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Knarley Darley
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PostPosted: Sun Jan 22, 2012 7:18 am    Post subject: Reply with quote

You guys are hilarious.
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