Horror story
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Mountain Pass
Joined: May 2021
Posts: 105
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Horror story
So, after a near disaster on the highway (rim cracked and wheel almost fell off) I had the car (63 Galaxie with 351c) towed to a auto shop I’d used in the past for rims.
The task was simple: replace the rim and I needed a grommet for the pcv valve (whole other story). Picked the car up and it ran like absolute crap on the way home some 3 miles- didn’t shift right, idled rough and felt like there was a vacuum leak. Long story short they had switched the distributor and transmission vacuum lines to the carburetor and it was running on full advanced timing. It seems to be ok now that I switched them back but I’m wondering what kind of problems will arise/ what kind of damage was done. I’m really getting fed up with these auto professionals trying kill my car lol
The task was simple: replace the rim and I needed a grommet for the pcv valve (whole other story). Picked the car up and it ran like absolute crap on the way home some 3 miles- didn’t shift right, idled rough and felt like there was a vacuum leak. Long story short they had switched the distributor and transmission vacuum lines to the carburetor and it was running on full advanced timing. It seems to be ok now that I switched them back but I’m wondering what kind of problems will arise/ what kind of damage was done. I’m really getting fed up with these auto professionals trying kill my car lol
Hotshot
Joined: Feb 2004
Posts: 10,806
Likes: 2,604
From: The Shenandoah Valley
It was only running on full vacuum timing under light or coast. I've run straight manifold vacuum on a distributor before, it results in high timing when coasting or near coasting, and it can increase fuel mileage. Even ported vacuum is same as manifold vacuum once the ported slot is open to manifold vacuum below the throttle plates. It will result in higher idle speed and it may lead to run-on after ignition is turned off if idle speed isn't adjusted lower.
Car didn't shift right because vacuum modulator was only getting signal after throttle opened up some. Like when you let up, instead of seeing high manifold vacuum and shifting for light to no throttle, the modulator suddenly saw no vacumm like in a wide open throttle, so it shifts accordingly.
Car is running better because the transmission vacuum modulator is getting it's correct signal.
Not likely that any damage was done.
You're welcome.
Car didn't shift right because vacuum modulator was only getting signal after throttle opened up some. Like when you let up, instead of seeing high manifold vacuum and shifting for light to no throttle, the modulator suddenly saw no vacumm like in a wide open throttle, so it shifts accordingly.
Car is running better because the transmission vacuum modulator is getting it's correct signal.
Not likely that any damage was done.
You're welcome.
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