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Idling issues

Moderator: Mod Squad

Tom Marnon
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Joined: Wed Jul 18, 2018 9:00 am

Idling issues

Post #1 by Tom Marnon » Tue Jul 24, 2018 1:00 am

Hi I’m new to this website and i came here to seek help with my 65 mustang it has an in-line 6 200 with autolite 1100 carb. My problem first started around June 14 when the car had started shaking and bouncing like crazy due to some bad hesitation which makes the car feel like it’s gonna die when I go to stop and idle at a light or idle in park. I adjusted the carb and then it was fine for a week until the problem had come back. I changed the spark plugs, messed around with the carb, checked my timing and I’m still not sure what it is that’s wrong and also throughout the summer I’ve noticed that when it gets really bad the car launches up when I step even the slightest amount on the gas. PLEASE HELP! Thank you!

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Re: Idling issues

Post #2 by StarDiero75 » Tue Jul 24, 2018 4:33 am

When was the carb last rebuilt? It might just be time to show it some love. It kinda sounds like fuel starvation, which would be why its so rough and gets happy when it gets any amount of gas. Try manually moving the choke to close when its hot, if it fixes it, then either

A: Vacuum leak
B: Carb needs rebuilding

To check if its a vacuum leak, spray brake cleaner or starter fluid around the base of the carb and where the distributor line goes into the carb. If it stutters/dies then thats your prob and usually tightening or a new gasket will fix that. If nothing happens then it may be time for the carb to get some attention

Also check your vacuum line to the tranny, that may give you some issues if thats causing a vacuum leak, which could explain the lunging when a little bit of gas is given.

Also, hows the tranny fluid? Im not sure if this can cause that though, sorry I'm a manual guy lol.

Good luck man,
--1965 Ranchero w/1966 200, dual friction diaphram 9" Modern Driveline clutch and billet flywheel all balanced, 1985 SVO WC T5 with front shift, 1966 2.8 Ford 8", Weber 32/26 with VI adapter, CRT Performance HEI.
--1961 Studebaker Lark VI, OHV 170 l6 in the process of being resurrected. But it lives
--Creator of the only Weber 32/36 conversion video.

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Re: Idling issues

Post #3 by frozenrabbit » Tue Jul 24, 2018 10:30 am

check the fuel filter

Tom Marnon
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Re: Idling issues

Post #4 by Tom Marnon » Tue Jul 24, 2018 12:24 pm

Thanks for the reply and I didn’t mention this in the post which probably would’ve been helpful. But we had my neighbors shop put on a new carb since the old one was warped very badly and could not be fixed but I will still take all of the advice you’ve given me and try it out, thank you so much!

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Re: Idling issues

Post #5 by mustang6 » Wed Jul 25, 2018 4:18 am

So did this problem develop AFTER the new carb was installed? It's very common to go through one or more reman carbs before finding one that works well. Not sure why it is so hard to get a good one but it is a common experience.

68 Mustang 200 ci, Aussie 250-2V head, Dual Headers, Comp Cams 252H, DSII w/MSD 6AL, T-5, V8 suspension.

65 Ranchero 200 ci, late 170 head, Autolite 1101, 3.03 3 speed, Maverick 8" 4 lug rear with 3.55 gears.

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