| Crappy Idle [message #83434] |
Fri, 07 May 2010 03:12  |
jtblank
Messages: 237
Registered: June 2007
Location: Tulare, CA
Karma: 1
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Senior Member |
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Recently the idle has become really rough when warm, upon cold startup it runs fine until you bump it off the fast idle then it acts like the choke is stuck, stumbling and sooty exhaust. Checked choke and open but actually runs a bit better whne choke pushed partially back with finger. I'm thinking cracked intake and going to pull plugs to see if all are same condition or specific cylinder related. Just got back from a trip and pulled the Cuesta grade with no problems and full power although I haven't check the numbers but fuel economy seems to have decreased. Anybody seen this? related to intake crossover crack?
Thanks
John Blankenship
'76 Palm Beach
Tulare, CA
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| Re: [GMCnet] Crappy Idle [message #83441 is a reply to message #83434] |
Fri, 07 May 2010 07:53  |
Jim Bounds
Messages: 842
Registered: January 2004
Karma: 0
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Senior Member |
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John,
Look at your vacuum when the motor is running well cold. Compare that to the vacuum when the motor is stumbling hot. if your vacuum is lower by say 5", I think you are right there is a crack in your intake. whatever it is it is effected by temperature and the swelling of the intake would do that.
Good luck, I think you are on the right track,
Jim Bounds
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----- Original Message ----
From: John Blankenship <jtblank@yahoo.com>
To: gmclist@temp.gmcnet.org
Sent: Fri, May 7, 2010 4:12:23 AM
Subject: [GMCnet] Crappy Idle
Recently the idle has become really rough when warm, upon cold startup it runs fine until you bump it off the fast idle then it acts like the choke is stuck, stumbling and sooty exhaust. Checked choke and open but actually runs a bit better whne choke pushed partially back with finger. I'm thinking cracked intake and going to pull plugs to see if all are same condition or specific cylinder related. Just got back from a trip and pulled the Cuesta grade with no problems and full power although I haven't check the numbers but fuel economy seems to have decreased. Anybody seen this? related to intake crossover crack?
Thanks
--
John Blankenship
'76 Palm Beach
Tulare, CA
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| Re: Crappy Idle [message #83489 is a reply to message #83434] |
Fri, 07 May 2010 13:05 |
fred v
Messages: 999
Registered: April 2006
Location: pensacola, fl.
Karma: 0
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Senior Member |
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make sure your choke is opening all the way. my electric choke was only opening about 3/4. when i replaced it the engine ran much better and i got better mileage.
Fred V
'77 Royale RB 455
P'cola, Fl
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