Does This Carb Issue sound Normal?
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Senior User
Joined: Jan 2007
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From: Milltown, NJ
Does This Carb Issue sound Normal?
Hi all,
OK, my truck started to run really rich. Dark grey exhaust, rough idle and at higher rpm's it ran strong but "bumpy".
While looking everything over I did something you should not usually do... I unbolted my electric dashpot bracket from the carb body while the ignition was at the "on" position and a SPARK jumped out between the two pieces just as they separated.
I touched them together again lightly and it happened again.
The dashpot worked fine before my above mentioned problem and it is a stamped unit so I cannot take it apart.
I followed the feed wire as far back into the harness as I could without seeing a break.
IS THIS NORMAL? Is the dashpot supposed to be grounded?
I have purchased a rebuild kit but have not yet completed the job.
Any thoughts on this?
Thanks,
Ken
OK, my truck started to run really rich. Dark grey exhaust, rough idle and at higher rpm's it ran strong but "bumpy".
While looking everything over I did something you should not usually do... I unbolted my electric dashpot bracket from the carb body while the ignition was at the "on" position and a SPARK jumped out between the two pieces just as they separated.
I touched them together again lightly and it happened again.
The dashpot worked fine before my above mentioned problem and it is a stamped unit so I cannot take it apart.
I followed the feed wire as far back into the harness as I could without seeing a break.
IS THIS NORMAL? Is the dashpot supposed to be grounded?
I have purchased a rebuild kit but have not yet completed the job.
Any thoughts on this?
Thanks,
Ken
Posting Guru
Joined: Jan 2001
Posts: 2,357
Likes: 3
From: S. Mississippi
I've never actually had one of these carbs that the dashpot still worked on. I would think that if it were wired into the harness, then that is more than likely the positive side, and it uses the carburetor as a ground.
But, i've never had one that had a working dashpot on it, so i couldn't accurately say.
But, i've never had one that had a working dashpot on it, so i couldn't accurately say.
Cross-Country
Joined: Jul 2007
Posts: 79
Likes: 1
The dshpot is generally just for idle control. It comes on when the a/c is turned on to raise the idle.
Was it acting up before you messed with it??? While I am not sure about grey smoke, white smoke is Water like from a blown head gasket. Need more info before I could guess beyond that
Was it acting up before you messed with it??? While I am not sure about grey smoke, white smoke is Water like from a blown head gasket. Need more info before I could guess beyond that
Posting Guru
Joined: Jan 2001
Posts: 2,357
Likes: 3
From: S. Mississippi
The grey smoke does sound like a rich condition to me. When was the last time the carb was rebuilt? These 1bbls get a little finicky after awhile...and become a bear to tune. Check the bolts that hold the carb to the intake to make sure they are tight, and all your vac lines are good. Failing that it might be float trouble, clogged jet or something of the like.
Thread Starter
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Senior User
Joined: Jan 2007
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From: Milltown, NJ
I'm in the process of the carb rebuild now but the electrical issue is what I really need advice on. There is only ONE wire to connect so I am assuming it might ground to the carb.
The truck runs OK without the dashpot but I like to have all the parts working if I can help it.
Thanks.
The truck runs OK without the dashpot but I like to have all the parts working if I can help it.
Thanks.
Moderator
Joined: Jan 2001
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From: Virginia
How do you know it doesn't work? Does it move out when you turn the A/C on? Usually those things don't have the power to move the throttle themselves, but will keep the throttle pushed open farther after you push on the gas once.
Senior User
Joined: Jun 2002
Posts: 330
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From: Chandler,Arizona - USA
What I believe you have there is the idle Stop Solenoid and dashpot combination. The dashpot has a spring and plunger on it and it is always working whether the AC is on or not. The dashpot itself is not electrically controlled, but the Idle Stop Soleniod is electrically controlled, and comes on when the AC is turned on to bump up the idle. The idle stop solenoid should have one wire with a connector on it, and when engaged, pushes a plunger into the dashpot. I believe that the dashpot is for turcks w/ automatic transmissions. It keeps the truck from stalling when you take your foot off the gas as when slowing to make a turn. The dashpot is also known as the "anti-stall dashpot". The dashpot releases air pressure slowly, when you take your foot off the gas. My 1983 F100 w/ the 4.9 1bbl carb had this setup. If you have no juice going to the solenoid, the dasgpot will still work. I just installed the idle stop solenoid/dashpot thingy on my '85 F150 after I got rid of the TFI ignition. Man, did I have a hard time finding this part! Hope this helps.
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From: Milltown, NJ
Ahh...Paulz150 & Frankin2. Those were the answers I was hoping to get.
I do not have (never did) A?C but I do have an auto trans.
I did not realize the two parts of that unit acted somewhat independently, for different reasons.
I believe my problem is solved. I will put the unit back on as it DID operate as Paul stated. It just struck me odd that it would spark like I stated
I never had a problem with the trucks performance in the two years I have owned it.
Thanks all for the help.
Ken
I do not have (never did) A?C but I do have an auto trans.
I did not realize the two parts of that unit acted somewhat independently, for different reasons.
I believe my problem is solved. I will put the unit back on as it DID operate as Paul stated. It just struck me odd that it would spark like I stated
I never had a problem with the trucks performance in the two years I have owned it.
Thanks all for the help.
Ken
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Senior User
Joined: Jun 2002
Posts: 330
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From: Chandler,Arizona - USA
Maybe there is a crack in the wire insulation on the idle stop solenoid and it's arching? The solenoid/dashpot unit should come off as one piece. The bracket is held on by 2 screws, it should come off easy enough for a closer look. Good luck!
Lead Driver
Joined: Feb 2003
Posts: 8,140
Likes: 4
From: Oak Harbor, OH
It has a HOT wire that is energized when the KEY is in the ON position. It uses the carb body for it's ground. It's going to arc a little if there is power to the motor as when you pass is close to a ground the electricity naturally tries to follow the path of least resistance.
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