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Joined: Jul 2012
Posts: 131 Likes: 1
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OP
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Joined: Jul 2012
Posts: 131 Likes: 1 |
Hi everyone,it has been a while since I posted anything but I'm hoping someone can solve my problem. I have a 250 motor, all stock with a 1bbl carburetor and a TH350 transmission. I have a horrible vibration as soon as the car goes on any gear. The moment I put it on neutral or in park, the vibration goes away. It seems to only do this when the car is warmed up. Now while I'm driving, the vibration doesn't seem to be there, but when I come to a stop sign or a light the thing just goes crazy vibrating. Please guide me with some answers.
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Joined: Jul 2012
Posts: 131 Likes: 1
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OP
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Joined: Jul 2012
Posts: 131 Likes: 1 |
I will add that I replaced my tranny mount, and double checked my motor mounts. All good.
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Joined: May 2016
Posts: 468 Likes: 4
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Joined: May 2016
Posts: 468 Likes: 4 |
Is the transmission equipped with a "lockup" Torque converter, torque converter clutch?? If so, you may have a bad TCC switch on the brake pedal or a bad converter, (clutch worn or damaged).
Never use a minor caliber bullet on a major caliber adversary
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Joined: Jul 2012
Posts: 131 Likes: 1
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Joined: Jul 2012
Posts: 131 Likes: 1 |
I'll be honest with you, I don't know what kind of torque converter it is. I simply asked my local parts store for one to work with a th350, nothing more. But if it was a bad converter, wouldn't it be vibrating at cold start as well? Because it only starts doing it after the engine has warmed up.
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Joined: May 2016
Posts: 468 Likes: 4
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Joined: May 2016
Posts: 468 Likes: 4 |
What kind of vehicle is it? Does it have an electronic control module?
Never use a minor caliber bullet on a major caliber adversary
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Joined: Jul 2012
Posts: 131 Likes: 1
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OP
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Joined: Jul 2012
Posts: 131 Likes: 1 |
The motor is in a 50 chevy car. Single bbl carburetor with electronic choke, and petronix ignition system. No electronic control module.
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Joined: Apr 2004
Posts: 3,556 Likes: 35
1000 Post Club
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1000 Post Club
Joined: Apr 2004
Posts: 3,556 Likes: 35 |
Do you have a dedicated frame to engine ground cable? Body to ground cable?
Inliner Member 1716 65 Chevelle Wagon and 41 Hudson Pickup Information and parts www.12bolt.com
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Joined: Jul 2012
Posts: 131 Likes: 1
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Joined: Jul 2012
Posts: 131 Likes: 1 |
Yes I do have both grounds.
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Joined: Apr 2003
Posts: 1,537 Likes: 15
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Joined: Apr 2003
Posts: 1,537 Likes: 15 |
Do you have a tuning tach? What is your RPM in park? In gear?
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Joined: Jul 2012
Posts: 131 Likes: 1
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OP
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Joined: Jul 2012
Posts: 131 Likes: 1 |
I don't have a tuning tach. And my car does not have an rpm gauge. It's a stock 1950 chevy car.
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Joined: Jul 2012
Posts: 131 Likes: 1
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Joined: Jul 2012
Posts: 131 Likes: 1 |
I did put new spark plugs in this evening and at first it seemed like the problem went away, but after I turned the car off and on a couple of times, the vibration came back. My old plugs were very very dark. I wish I knew how to post a picture of them.
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Joined: Jul 2012
Posts: 131 Likes: 1
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Joined: Jul 2012
Posts: 131 Likes: 1 |
Someone recommended I put in a Langdon Stovebolt HEI mini. Is there another brand as good? Any recommendations?
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Joined: Jul 2000
Posts: 4,585 Likes: 19
1000 Post Club
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1000 Post Club
Joined: Jul 2000
Posts: 4,585 Likes: 19 |
Have you check the dampener to make sure it is not loose on the crank?? If you think it is a miss fire issue with the dist. you have right now swap it out for a stock HEI Or remove what you have in it now and go back to stock just to test things.
Larry/Twisted6 [oooooo]  Adding CFM adds boost  God doesn't like ugly.
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Joined: Jul 2012
Posts: 131 Likes: 1
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Joined: Jul 2012
Posts: 131 Likes: 1 |
I am getting the new HEI distributor on Friday. Over the weekend I'll swap it out and see how things are. As far as plug wires, I was recommended 1980 chevy truck wires, I'm not sure why. Any suggestions for wires? 8mm, 8.5? Brand?
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