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when the choke plate is closed as rpms drop, engine will shut off and when I flip up the choke plate ( its 3/4 open) the engine will rev up to 1600-1700 rpm
By what you say here maybe we are going in the wrong direction. If you can open the choke and it revs up it is too rich.
Is the choke electric or exhaust heated? sounds like it is staying on too long.
Try backing the adjustment off a couple of notches. _________________ 84 Elky with 455 Buick, Tremec TKO600 5 speed, 8.5 3:42 posi -
My Members Page Album
Another 3 to 9 years should finish it.
electric. But i cannot adjust idle speed down to 700-800 rpm and i dont know why. If I adjust down past 1000 RPM while warm, the engine starts to die so I adjust it back up. I will be putting the adapter plate back on to reduce that from the equation. next post will have results
Necoa #: 7195
Location: 17(S.CA,S.NV)
Joined: Mar 26, 2006
Posts: 682
Year: 1977
Model: El Camino
Posted: Thu
Jun 12, 2008 4:14
pm Post subject:
Alex, What Neil was saying was to adjust your choke, THE BIG BLACK CAP, on the choke, you do that by looseing the 3 screws and turning it towards the - side. It may be set to tight or rich, then re adjust the Idle screw and see if that works. WHEN the Engine is warm, or at operating temp, the choke plate should be all the way open, not just part way. _________________ Keep the Shiney Side Up
The Rubber Side Down !!
aka Larry
http://elcaminocentral.com/gallery-album_CoyoteOn2s77Cage.html
Necoa #: 2321
Location: 15(AZ,NM)
Joined: Jan 30, 2004
Posts: 1087
Year: 1974
Model: El Camino
Posted: Thu
Jun 12, 2008 10:24
pm Post subject:
I had a similar issue when I switched to the 680 Holley Street Avenger with an electric choke. In the end the choke had to be pulled apart and reinstalled because it wasn't allowing any adjustment. Also had to richen the primary jets by two sizes to keep it from cutting out. The cut-out was most noticeable at 75MPH too and the engine was running about 20 degrees higher than normal too.
_________________ 74 El Camino Classic - project car #1
96 Camaro - RIP, Traded 10-16-2007
2008 Mustang GT, It ain't a Chevy but at least it's American!
Hello all, first I had to take off the choke housing because the pin for the choke plate was not lined up on the tab for the housing bimetal spring so I wasnt getting any adjustment. We also adjusted the float levels, timing, and idle mixture. To this point we have good solid idle of 800 rpm, 12 inches of vacuum @ 8 degrees TDC. The engine ran well until yesterday when it started "sputtering" off idle into gear and wouldnt smooth out until I put some real rpm into it. Im thinking fuel filter or air, so I will open the hood tonight and check.
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