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Choke question


mako's Avatar
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12-02-02, 11:57 AM   #1  
Choke question

86 Cutlass Supreme (THAT car, Joe, lol) 307V8, 108K miles, automatic, factory 4bbl carb (defenitley a quadrajet but not sure of the exact model).

I took a peak at the choke this morning, from a cold start to operating temp. According to my Haynes guide, it says that the choke plate should be at full vertical stance when warm. Mine isn't. It stays at about a 45 angle. When the gas pedal is floored, the plate doesn't close, but Haynes says it should. Also, once warmed, there is a bit of play in the choke plate. I can push it to the open position and there is NO resistance to it, but gravity pulls it back to the angled position. This doesn't seem right, then again I'm not well versed in carbeuratology.

The choke was nearly fully open when first running and slowly closed up a bit, but stopped at the position described above.


The reason I checked it is due to a slight cold temp problem. When the weather is cold, and the engine hasn't made it to operating temp (or somewhere therabout since the Cutty only has a dummy light), the car stammers when accelerating or revving. The engine shakes and jerks a bit, kinda like the way my old truck acts when the fuel filter gets clogged (this car has one that is only 6mos old). Once the car is warm (after say 10 minutes of idling OR slightly less when driving lightly) it goes away.

Could this be the choke?

 
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12-02-02, 02:08 PM   #2  
davidf
Thermostatic coil may be bad or not inserted in its housing correctly or not adjusted right by the index marks on top of the housing and if it is electric operated then it may not be getting power to it.If it is heat operated then it gets the heat from manifold stove pipe and the pipe might be broken from rust or not not pushed into the manifold.The thermostatic coil is the device that pulls the choke wide open after the vacuum break operation is done.The vacuum break opens the choke plate just a crack right after engine starting to prevent stall due to the over rich mixture caused by a shut choke plate.The choke plate should be wide open at normal engine temp but check it with the engine running because the angle of the plate is also determined by the air downdraft past the the choke plate.


Last edited by davidf; 12-02-02 at 03:33 PM.
 
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12-03-02, 03:43 AM   #3  
Joe_F
Have both choke pull offs and the choke coil adjusted/replaced as necessary.

Yes it's a Q-jet, #17086008 or something of that sort to my recollection---my coworker owns your exact car.

 
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12-04-02, 05:26 AM   #4  
Thanks to you both. David's post was a tad over my head (I was asking for it by posting a carb question) but I'll take that info to a friend of mine.

By this point you're prolly wondering what in the heck I DIY anyway, lol. I mainly come here to learn about automotive stuff. My dad passed away last year and he was THE automotive DIY in the family. He could have yanked that Qjet and rebuilt it and had it back in before I could blink. I was stupid and never learned any of the "good" stuff from him. You guys are doing a great job teaching me. I read tons of the posts here (especially GM posts since I live and breathe GM vehicles).

Thanks again!

 
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12-04-02, 09:40 AM   #5  
Joe_F
I learned from my dad too, but he passed away in ' 88. I then learned from my neighbor as well who owns a repair garage after being a former accountant in the 80's.

Stick with people that want help, are willing to help you and let you get involved. That's where you learn the most.

 
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12-04-02, 02:04 PM   #6  
Hah, you nailed a good point Joe (not that there's only one good point... but it rang a bell with me).

If you are learning by helping someone else, then make sure they want the help. I'm speaking from the other point of view.

I get offers for help all the time but I prefer to work on my cars by myself whenever possible. I have had to get quite direct with a couple of people over the fact that I did not want help.

Something about driving something down the road that is running because your hands fixed it that keeps me like this I guess.

You folks had me thinking and wondering about who I learned from. I guess I learned that I liked to fix vehicles by watching my dad. Usually I was the gopher, and I didn't really learn much about how to do things.


I have to say, though, that I'm a self-made "mechanic". I learned by doing. I have to admit the internet plays a huge role sometimes. I go to about 3 or 4 forums and several newsgroups seeking and offering help. If I can't figure it out by myself with my manual(s) I usually turn to the net. (Followed by family members who also work on cars).

So far so good. I have the longest lived car in my family at 7 years (8 next summer). I mean I've had it 7 years... the car is 12 years old.

I've done so much engine work and pulling on escorts from the mid to late 80's that I almost consider myself educated on them.


Recently I took on 2 totally new vehicles to me. I put a 2.2 from an '87 Charger in to an '87 Caravan. I'd never done so much as an oil change on this engine size. But with the manual and determination I got it done (a bolt is a bolt is a bolt). With a little help from the net.

Man am I rambling.... what was this thread about again? Lol

By the way, I did call the junkyard about the compatibility of the Chargerís 2.2 with the Caravanís. They said the computerís say they wonít swap. (As the odometer passes 1k miles with that exact setup) My guess is the differences in the pollution control standards for the 2 vehicles make the computer say that. (He didn't act like the computer said the reason they don't swap.) The Charger had a feedback carb with altitude compensator. The Caravan did not. I went to the junkyard and found an í84 Caravan with a carb that I could use and the rest is rubber burniní history.

(LMAO)

 
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12-04-02, 03:46 PM   #7  
Joe_F
Be patient with those that want to help---remember, you were there once willing to learn too.

My friend and I usually do projects and work together, and we have a few laughs in the process. He's a good helper and sometimes, he's my eyes and ears when I can't be. Vice versa when it's his car we're working on.

We always treated each other's cars "down" as one of our own. He called me once that his tranny was pissing out fluid one time. It was a Thursday night. I said, "Meet you at the shop (my neighbor's) on Saturday morning" I coordinated with my neighbor to have a spot ready for us and we knocked it out in record time. We also did the water pump, timing belt and struts another time the same way.

We generally do that with whatever tasks we both need to do--from car repair to appliance repair, etc.

Read my post "The Basics"---you'll see I mention "two heads are better than one" a few times.

As for the swap, it all depends on what the Hollander book actually says. I would have to see it for myself.

 
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12-05-02, 05:53 AM   #8  
I would wager that ANY engine swap is possible given proper room, with enough adapter kits and welders and fabricators on hand. I saw on TV once, a custom car show, where a guy took a BIG mid-80s Merc-Benz, ripped out the motor and dumped a fully-tweaked LT1 from a Vette into it. Said it was a nightmare, but MAN was that one sweet car. White pearlcote paint, all the trimmings, and even a 1200 watt stereo system. I'm guessing about $100K worth of work but I bet he's won more money than he's spent.


Anyhooo, I really need to get that choke checked. I noticed this morning that, in drive sitting at stoplights, the car is starting to shake. Normally I can't hardly tell the 307 is alive, but sometimes it acts like it has ADHD (like me) or something.

 
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