Question about 2002 Chevrolet Tahoe

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My 66 mustang lopes up and down, I have to crank

My 66 mustang lopes up and down, I have to crank down a high idle to keep it from stalling . I disassembled the carburetor, it did not require much cleaning at all. A simple basic heat choke, vac secondary's Holley 4150. Replaced all the gaskets quite correctly and now I wonder if my idle is related to my work or the choke, floats levels etc needs adjustments. Some one told me adjust the timing but I think that will not help. Any ideas friends? https://www.youtube.com/watch?v=ZIaYBUPo-vQ

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  • Lawrence Aug 24, 2013

    I have been working on the Air leak vaccum idea also. Its hard to tell at such a loud engine speed and unstable lope to tell if I get a responce. I will contact you guys again.

  • Lawrence Sep 15, 2013


    Well My further examinations show that even with the high idle and bad lope. If I force the choke plate closed it runs down and stalls. I cant spray any carb cleaner or other combustible on the outside of the carb because the high noise and rev motor . I just cant hear a change in the motor with that technique.

    I did pull the vacuum hose to the distributor off the metering block and place my finger over the nipple. Found some suction and it did run down and stall.

    Someone suggested soapy water in a spray and look for bubbles. / leaks

    What is more questionable is this

    Q. If an engine under high power load drops in its Fuel pressure from 6 PSi to 3 PSi is this enough to cause a loping problem?

    I don't think it's related?

    I'm at my wits end with this.

    Thx

    Lawrence

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  • Chevrolet Master
  • 53,755 Answers

High idle can be associated from a vacuum leak in the system- brake booster hose loose---vent hose cracked /broken or not connected. Check for broken gasket from manifold to carby. Check that the vacuum hose for the distributor is connected and not cracked

Posted on Aug 24, 2013

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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shaggyrat
  • 1224 Answers

SOURCE: chevy truck headlights

yes there are 2 align bolts looks like backward hex's
or philip head one on top and one on out side parameter of lite

Posted on Jun 10, 2008

keemo68
  • 1263 Answers

SOURCE: 1995 chev monte carlo high IDLE

what it basically sounds like is you have a vaccum leak. chances are either the vaccum line to the manifold is got a hole in it or your mps(manifold pressure sensor might be on the fritz) if you replaced the manifold gasket it was because you thought you were sucking air and you thought you were leaqning the fuel air mixture some how. take a look for the vaccum leak and i'm sure you will solve this problem... please rate this..thanks

Posted on Sep 01, 2008

  • 1 Answer

SOURCE: holley 650 carburetor

http://holley.com/data/Products/Technical/199R9881.pdf
This should help you

Posted on Nov 10, 2008

  • 334 Answers

SOURCE: idle too high on a 06 cobalt

when you clean it make sure that you hold the butterfly open so you can get the spots clean that need it. If there is anything in the way the butterfly will not close. Just a small bit of dirt will do this .

Posted on Dec 26, 2008

ourhowse
  • 2007 Answers

SOURCE: engine starts,reaches high rpm,then slowly returns

Vacuum leaks. Check all hoses and intake bolts. Leaking EGR or plugged PCV valve. Air filter plugged. Leaking head gasket. Worn timing chain. Camshaft lobes worn. Valves burned or leaking. Fuel idle control system or sensor. Good luck!

Posted on Jul 03, 2009

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1 Answer

My 65 mustang stalls whenever i stop then it starts right back up


Hello Larry,

Without the car running... You should be able to open
the throttle.. and literally DROP it back to idle...

Observe the action of the THROTTLE RETURN
DASH-POT
T should visibly SLOW the RETURN
of the throttle linkage like a door closer...

If you do not SEE the slowess... the dashpot
should be replaced (they are getting SCARCE).

SIX CYLINDER (EXAMPLE (only))
http://www.ebay.com/itm/NORS-65-67-MUSTANG-64-67-MERCURY-COMET-FORD-FAIRLANE-FALCON-DASH-POT-C2DZ9B549A-/142309387430?hash=item21224ceca6:g:kE8AAOSwo4pYmKnd&vxp=mtr


You will need to have the THROTTLE RETURN DASH-POT
on your (unspecified) carburetor
tested and adjusted... and the IDLE SPEED correctly set.

Idle Speed and a slow rate of RPM reduction is
critical to the proper function...

Some LESSOR "mechanics" will attempt to raise the
IDLE SPEED to compensate for a malfunctioning
DASHPOT... This will PROFOUNDLY exacerbate
the problem.

Throttle return dashpot (various pictures)
Go to Bing homepage

example DASHPOT (six cylinder)
NORS 65 67 MUSTANG 64 67 MERCURY COMET FORD FAIRLANE FALCON DASH POT...

example 1968 302/5.0L: Falcon, Mustang 2BBL carb
Carter 202 737 Carburetor Dashpot Ford 2 BBL Carburetors Replaces D7ZZ...

Hope this helps

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