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Author
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Topic: 85 GT Electric Choke
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bifs66
Journeyman Posts: 26
From: Maryland
Registered: Apr 2000
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posted 10-17-2000 10:48 PM
  
My 85 GT (totally original with low milage) has recently developed a problem. I noticed that the choke is not coming off at all after the engine is warmed up. Is there something fairly common to look for before I tear the whole choke assembly apart? It doesn't appear to be like the older Hollys that can be adjusted and disassembled with a screwdriver. Thanks for any ideas.------------------
Bernie Frank
66 Fastback restomod project
67 Coupe (original)
85 GT (preserved)
82 GT (original)
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Stewart
Pit Boss Posts: 3620
From: Monterey, CA Mustangsandmore Member #437
Registered: Apr 2000
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posted 10-18-2000 01:34 AM
I had this exact same problem with my 90 GT back in June. If you do a search using my name (Stewart), using the word "idle" in the Search Word box, in the catagory "all forums and archives", it will come up.I'm not sure how similar the carburated speed density systems are with the EFI mass air ones, but for me, my problem was traced to a plastic line I had busted. I snapped one of those tiny, hard plastic tubes that branch out from a rubber collector, and runs parallel to the valve cover to the front of the engine. When I did it, I had no idea what it was for (vacuum, possibly?) and didn't want to have to spend an arm and a leg to have the whole system of tiny, hard plastic tubes replaced (they all look integrated by that rubber collector). Well, in trying to track down what the cause was for my high idle, I found where the tape I had used to patch the two ends had come apart, and allowed the two ends to seperate. I re-taped the tube and the high idle problem has since vanished! Capri and CPMaverick also had some GREAT idea's for my high idle problem, most of which I had already tried (except for the TPS and the IAC solenoid). There are also some newer members here now (Ian, Mike, & Dave) that can add their two cents and probably help you out. Any of you guys have any idea's to help Bif out? Stewart ------------------
Got Milk? :-)~~
If you go fishing, bring a fishnet ;) you might catch a hummingbird 1990 Platinum GT (my poor baby's sheet metal has been violated!)
- Some mods, but not enough!
1996 Blue Crown Vic
- Suspension and exhaust mods, but nothing else...YET!
M&M Member #437
Blue Oval Believer, thru and true.
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Capri
Pit Boss Posts: 918
From: Lyons, ILL, USA
Registered: May 99
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posted 10-18-2000 09:35 AM
Welcome Bifs66! If we can help, we will!!!!!The first thing I Would look for is a wire that is chaffed and grounding. There really is not much to a electric choke on an 85. It is similar to any other Holley carb. I am assuming this is a stick, and not an automatic. If the choke is not coming off, then I believe the heat spring has gone away. I am not sure there is any other thing that is related to the choke that would cause it to not work. Unless the choke plate is sticking and needs to be cleaned. However, I could always be missing something. Tony.
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Gearhead
Gearhead Posts: 569
From: The Rock, Crazy Canuckland, 1979 Indy Pace Car
Registered: Mar 2000
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posted 10-18-2000 02:19 PM
I'd check the things that Tony suggested and also spray the heck out of the choke assembly with carb/choke cleaner (if you haven't already). The choke on my 79 5.0 did a similar thing, and it turned out to just be build-up in the linkage and choke assembly. A massive cleaning got everything working smoothly again.Just a thought! Let us know if none of this works and we'll try a different angle. ------------------
Cheers,
Ian
M&M Member #395
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'79 Mustang Indy 500 Pace Car
Ian's Pace Car Page
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cpmaverick
Pit Boss Posts: 590
From: Auburn, AL.
Registered: Jan 2000
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posted 10-21-2000 03:09 PM
Bernie, it should be an electric choke, check for power at the choke wire before condemning the choke, it should have power whenever the engine is running. Otherwise it will always stay closed. You probably have a broken wire somewhere; I just fixed an 86 Bronco 351 HO with the same carb & same problem. If you have power, you probably have a bad choke assy. ------------------
-Charlie Ping
1970 Maverick Grabber
-1987 5.0L B303 roller cam/rockers
-1968 Mustang Toploader
-1977 Lincoln Versailles 9 inch w/discs
-1980 Granada Front Discs
www.MAVERICKGRABBER.com
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bifs66
Journeyman Posts: 26
From: Maryland
Registered: Apr 2000
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posted 10-21-2000 08:31 PM
Thanks for your interest in the choke problem. I checked the voltage getting to the choke and it looks to be about 6V. Of course, I may have read the "tiny" meter scale wrong, but it appeared about half scale of a direct battery reading. I lubricated the linkage and played around working the choke back and forth and it seemed to work after a while. Last evening, I took the 85 to the local cruise spot and the choke seemed OK on the way there. It set for a few hours and cooled down. When I left for home, the fast idle was "on" for about 9 miles (which I think ment the choke was slow coming off), It eventually did come off before I got home. In recent years, the car sets still a lot (particualrly since I spend most of my time on my 66 Fastback project) and I guess the choke may have some corrosion inside. Maybe I need to drive it more!------------------
Bernie Frank
66 Fastback restomod project
67 Coupe (original)
85 GT (preserved)
82 GT (original)
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Capri
Pit Boss Posts: 918
From: Lyons, ILL, USA
Registered: May 99
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posted 10-22-2000 04:49 PM
Well of course you do Bernie!!!! Drive the thing! lol I would say that you should blast the plate again with carb cleaner. Goto your local Wal mart and get Tech 2000 Carb cleaner. Its cheap and like the paint gouging gumout of old. Then look at the electric choke assy. I believe that might be your whole problem.Tony.
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SteveLaRiviere
Big Kahuna Posts: 10277
From: Saco, ME USA MCA # 47773
Registered: May 99
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posted 10-23-2000 04:43 PM
A quick way to check it is, when the motor is cold and not running, open the throttle all the way. The choke plate should snap shut. If it's weak, it's time for a new one. Choke thermostats just get tired after a while.------------------
SteveLaRiviere/Webmaster -- MCA # 47773
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Stewart
Pit Boss Posts: 3620
From: Monterey, CA Mustangsandmore Member #437
Registered: Apr 2000
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posted 10-31-2000 08:20 PM
Hey Bernie, did you figure out your choke problem?Stewart
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evlgt85
Gearhead Posts: 169
From: Behind the wheel of an angry 85 Mustang GT
Registered: Nov 2000
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posted 11-02-2000 04:17 PM
My 85 did the same thing. But soon after it started doing that, it developed other problems, and I decided 'to heck with it' and put on a new carb. My car is rough enough around the edges that keeping it stock doesn't matter. It's nice to see the pure ones running around, though. Not enough of them left.  ------------------
Four Eyed Pride
85 Mustang GT
Surrogate 90 GT
Cats Paxton and Cleveland
StangtecModerator
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bifs66
Journeyman Posts: 26
From: Maryland
Registered: Apr 2000
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posted 11-02-2000 07:41 PM
Stewart,
I lubricated things and "exercised" the choke, and it seemed to work. However, after it sat for a couple of days, I fired it up and it refused to open again!. Steve, the spring seems OK as it "snaps shut" like you said it should. I suppose I'll have to remove the special fasteners and take a look inside the choke. Lately, I've been bogged down restoring and installing the interior in the 66 Fastback. I don't know how they did this on a production line!! I typically take 3 steps forward and 2 back. In the meantime, the 85 hood remains open waiting for some attention.------------------
Bernie Frank
66 Fastback restomod project
67 Coupe (original)
85 GT (preserved)
82 GT (original)
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cpmaverick
Pit Boss Posts: 590
From: Auburn, AL.
Registered: Jan 2000
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posted 11-02-2000 07:47 PM
Make sure its getting power (with a test light) when its not working, it could be a broken wire. Seen it before, in fact last week on an '85 Bronco.
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