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Need guidance on the Qjet. It has the manifold mounted spring divorced choke. The engine starts fine on a cold start but the pull off never opens back up after it’s warm. Any suggestions?
Also, probably related, the car drives fine around town but if i get up to 2500 rpm then i loose power and let off the throttle to remain under 2500 rpm.
Automatic Trans. I can floor it 0-60 but eventually looses power. Any advice would be helpful!
Why would you expect the pull off to disengage when warm? It's directly connected to a vacuum port on the carburetor and temperature has no effect on that port.
Have you checked the fuel filter located in the carburetor inlet?
Why would you expect the pull off to disengage when warm? It's directly connected to a vacuum port on the carburetor and temperature has no effect on that port.
Have you checked the fuel filter located in the carburetor inlet?
I thought once the engine warmed up then the divorced choke spring would heat up causing the choke rod to open the pull off. I really don’t have a clue lol
And yes, I changed the fuel filter in the inlet and it definitely needed it. Ran better afterwards but still boggs down at 2500 rpm
From: At my Bar drinking and wrenching in Lafayette Colorado
As Mel correctly states, your choke pulloff is operating normally. It does not extend when the engine warms up - it has no correlation to engine temp.
If you have a new filter correctly installed, you might want to check your fuel pressure. The hole in the center of the filter needs to be pointed towards the fuel inlet fitting:
Your fuel pressure needs to be over 4 psi but less than 7. But always check your ignition system and timing first before chasing carb problems.
I think that you may have a terminology mix up here.
Are you saying that the choke doesn't open up all the way when the engine warms up?
If so, as stated above, it not a pull off problem but a choke problem.
The choke is a pretty simple system. I would take the cover off the manifold choke housing and make sure it is clean and connected to the linkage correctly. Put a little heat to the spring and see if it unwinds or winds up (not sure which way it goes), and reverses when it cools. Then look at the linkages on the carb, and try to figure out if anything is bound up. Spraying some carb cleaner and exercising the linkage may free things up. The thermostat spring isn't very strong, and minor binding could freeze it up.
I’ve had the car for a couple of weeks so the only thing I’ve done so far is replace the fuel filter and watched a million YT videos. There’s not much on this particular divorced choke (Manifold mounted coil spring) Plus replaced all fuses and lights so electronics is restored.
I’ll do all your recommendations and appreciate yalls feedback!
I’ll give an update soon!
PS- On a cold start, the choke valve opens all the way but when the engine is warm then the choke valve stays opened all the way. That’s why I thought the DC coil spring would warm up and cause the pull off to disengage so the choke valve would close at the proper setting. I could be way off on the proper functions of these parts.
I’ve had the car for a couple of weeks so the only thing I’ve done so far is replace the fuel filter and watched a million YT videos. There’s not much on this particular divorced choke (Manifold mounted coil spring) Plus replaced all fuses and lights so electronics is restored.
I’ll do all your recommendations and appreciate yalls feedback!
I’ll give an update soon!
PS- On a cold start, the choke valve opens all the way but when the engine is warm then the choke valve stays opened all the way. That’s why I thought the DC coil spring would warm up and cause the pull off to disengage so the choke valve would close at the proper setting. I could be way off on the proper functions of these parts.
On a cold start you step on the gas pedal all the way down at least once, remove your foot, before turning the key to start the car.
When you do that the choke should completcompletely close.
Does it?
When the car starts the choke pulloff should open the choke approximately 1/4".
Does it?
I’ll send pics of the stages
1. Took AF off and cold engine.
2. Pumped gas one time.
3. Cold start engine running.
4. Engine running after warmed up. 1. 2. 3. 4.
From: At my Bar drinking and wrenching in Lafayette Colorado
Your choke pulloff is adjusted completely wrong. Note the short pulloff link is almost folded over at a 270-degree angle to grossly shorten it. This is pulling your choke wide open upon cold start. Straighten that link out and repair it so it pulls the choke open 1/4" only.
The linkage should look like this:
When the engine starts cold, the choke pulloff should pull your choke open this far:
Your choke pulloff is adjusted completely wrong. Note the short pulloff link is almost folded over at a 270-degree angle to grossly shorten it. This is pulling your choke wide open upon cold start. Straighten that link out and repair it so it pulls the choke open 1/4" only.
The linkage should look like this:
When the engine starts cold, the choke pulloff should pull your choke open this far:
Lars
It was 50ish temperature that morning. I’ll adjust the linkage per photo and give y’all some feedback. Appreciate the help!
Holy smokes guys, bending that linkage did the trick!!!
1 pump start was right on AND it solved the issue of chocking out at 2500 rpms!!!!!
Much thanks for sharing your knowledge!!!
74 Qjet Issues
