84 engine dies when stopping
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New User
Joined: Apr 2005
Posts: 8
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From: Magdalena NM
84 engine dies when stopping
Hi Guys. Here's the deal. I'm not a car guy, but I'm pretty smart. Anyway, last year B2 ran fine, but the carb leaked like a rusty bucket. Swapped out the 2.8l carb with a TB from a 3.8l T-Bird with the harness, computer, sensors, and put in electric fuel pump. (thanks to all who helped with that) Runs wonderful in park and on the road, lots more power. BUT, when trying to come to stop, the auto tranny doesn't seem to downshift and the engine dies. Then it doesn't seem to want to start, like the engine is straining against the tranny. If I floor the gas, it will start but the engine races wide open. As long as I keep it floored I can take off and get back to highway speeds, and it runs fine as long as I don't slow to a crawl or stop. If I don't floor it and let it sit for an hour, or so, it will start right up with no extra gas and zips along like nothing ever happened. But if I slow to a crawl, or stop, it happens again. Anyone have any ideas on how to fix it? Is the downshift vacuum driven, because my vaccum lines are pretty bad.
Post Fiend
Joined: Jun 2002
Posts: 13,873
Likes: 3
From: Atlanta GA
> If I don't floor it and let it sit for an hour, or so, it will start right up with no
> extra gas and zips along like nothing ever happened.
Sounds like the TFI module might be bad. Might be a bad dist/pickup.
Though if you have bad vacuum hoses, that will do it too. Is your dist. the stock one, do you have the vacuum advance on the dist. with the octane rod?
> extra gas and zips along like nothing ever happened.
Sounds like the TFI module might be bad. Might be a bad dist/pickup.
Though if you have bad vacuum hoses, that will do it too. Is your dist. the stock one, do you have the vacuum advance on the dist. with the octane rod?
Post Fiend
Joined: Jun 2002
Posts: 13,873
Likes: 3
From: Atlanta GA
You know what, I was thinking about this some more.
I bet your cat. converter is clogged! Trouble with the transmission shifting and hard starting combined together are a good indicator, plus, dying at idle.
You had a rich running carb, then you added an intake from a different engine.
If I were you, I would run a "test" pipe and see if that clears it up. Or just unbolt the in front of the converter and run the exhaust open.
FWIW: When I bought my current truck ($300) it was not running right. I discovered the tail pipe was squished almost competely shut. I cut it off and viola! No idle and starting problems.
I bet your cat. converter is clogged! Trouble with the transmission shifting and hard starting combined together are a good indicator, plus, dying at idle.
You had a rich running carb, then you added an intake from a different engine.
If I were you, I would run a "test" pipe and see if that clears it up. Or just unbolt the in front of the converter and run the exhaust open.
FWIW: When I bought my current truck ($300) it was not running right. I discovered the tail pipe was squished almost competely shut. I cut it off and viola! No idle and starting problems.
Thread Starter
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New User
Joined: Apr 2005
Posts: 8
Likes: 0
From: Magdalena NM
Thanks for the quick replies. My back is out, so I haven't had a chance to look at your suggestions today. I'll get a can of cleaner tomorrow and clean all the linkages and sensors. If my back cooperates. The dist. is stock with the octane rod. The TFI module may have gone out on me. How do you check it?
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