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  #1  
Old 10-15-2008, 08:14 PM
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Join Date: Jun 2008
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'69 250 Auto tranny/vacuum problem?

OKAY. The car now idles perfect, around 700-800 RPMs. When it's cold(or first minute or two), when I put the car into gear, and then push the brakes to stop, it's fine. After the first minute or two, and when warm, the car goes into gear just fine, but if I push the brakes, the car dies. I currently have the rear up in the air. When I put the car into gear, the wheels start moving, car idles perfect. When I tap the brake, it dies. I have tested the brake booster by blocking off that vacuum line, and it makes no difference, so it's not a leak from the brake booster. I believe it's more related to a transmission slowing down, issue? Any ideas on what to check?

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Old 10-15-2008, 08:31 PM
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Is that 7-800 rpm idle in neutral or in gear? I believe the manual specs an 800 rpm idle in gear, which translates to an idle that seems rather high in neutral.
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  #3  
Old 10-15-2008, 09:37 PM
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::sigh:: Well I found an air leak on the rear carb on the base. It could idle lower than 700-800 at park. I just didn't have it set that low, I guess my point was that it idles okay. I'm assuming though that the air leak is going to throw the carb out of whack so thats why it's dying when under load.

I love this car!
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Old 10-16-2008, 09:00 AM
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It's been my experience that vacuum leaks can (read nearly always) make an engine run fine at idle but die as soon as it's dropped into gear.

Michael

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