Engine dies when when I hit the brake??
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patkelly4370
New member
Does it die in neutral too?
I have a Dodge Magnum that would die at stops unless in neutral.
A computer code was not unlocking the torque converter.
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I have a Dodge Magnum that would die at stops unless in neutral.
A computer code was not unlocking the torque converter.
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brillo_76
Elite Member
Does this happen to be an automatic? If so do the test for your Torque converter as that's a very good sign that it's bad.
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What would make a converter go bad? I just installed this engine and really want to make sure it's not a vacuum or electric issue before I rear it apart again.
patkelly4370
New member
In my case the dealer had just done a bunch of engine work. The computer code occurred on my way home from picking it up. It didn't have that issue when I brought it in.
Five minutes and they cleared the computer glitch and all has been well since.
Granted, this was on a Dodge. I have no idea if Toyota has the torque converter electronically lock up when in gear. Just tossing out a possibility. That's why I asked if it dies in park and/or neutral, if automatic transmission.
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Five minutes and they cleared the computer glitch and all has been well since.
Granted, this was on a Dodge. I have no idea if Toyota has the torque converter electronically lock up when in gear. Just tossing out a possibility. That's why I asked if it dies in park and/or neutral, if automatic transmission.
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My issue is when I'm in park so the torque converter isn't the issue. I'm thinking it vacuum
brillo_76
Elite Member
TC can go bad. However, if you just changed the engine messed with valve covers etc. Quite Possible a bad vacuum leak. As that will still at idle too.
The FSM has a test for the TC if you need to go that route.
Mostly when the TC start going bad it takes alot more rpms to get moving.
I have one with a bad TC its noisy as well.
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brillo_76
Elite Member
I missed the line I just installed the engine.
Why TC go bad?
The have bearings in them that can fail. People overheat their transmission fluid that warps the blades. People dont install them properly when changing an engine. The lockout mechanism stays locked thus making a 1:1 ratio fixed. Etc.
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Why TC go bad?
The have bearings in them that can fail. People overheat their transmission fluid that warps the blades. People dont install them properly when changing an engine. The lockout mechanism stays locked thus making a 1:1 ratio fixed. Etc.
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brillo_76
Elite Member
Dieselchessy
New member
Sounds electrical to me. Why else would the dash lights dim.
Guessing you have a brake light wire shorted (would expect it to blow a fuse), or don’t have all the grounds landed properly. Or something else is shorted.
Wouldn’t expect a TC or vacuum leak to cause dash lights to dim unless your battery is crap.
For grounds there is one from the back of the passenger side head to the fire wall.
One from neg terminal to fender, and neg terminal to engine block by driver side motor mount.
Then from the harness at the diagnostic port to the intake manifold drivers side.
Given it cranks to start, I’d expect the engine block one to be landed. Check the other 3.
Guessing you have a brake light wire shorted (would expect it to blow a fuse), or don’t have all the grounds landed properly. Or something else is shorted.
Wouldn’t expect a TC or vacuum leak to cause dash lights to dim unless your battery is crap.
For grounds there is one from the back of the passenger side head to the fire wall.
One from neg terminal to fender, and neg terminal to engine block by driver side motor mount.
Then from the harness at the diagnostic port to the intake manifold drivers side.
Given it cranks to start, I’d expect the engine block one to be landed. Check the other 3.
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brillo_76
Elite Member
If the idle is low enough. The lights will dim. As they barely charge at idle at it is. If the vehicle has a vaccuum assisted brake booster and the vaccuum leaks are bad enough. I could see the engine stulling out.
How does this engine idle?? As a tall tale sign of a vaccuum leak on the intake is a very rough idle.
If you run around a cold engine with wd40 /brake clear etc. Your engine will speed up when you hit the vaccuum leak.
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How does this engine idle?? As a tall tale sign of a vaccuum leak on the intake is a very rough idle.
If you run around a cold engine with wd40 /brake clear etc. Your engine will speed up when you hit the vaccuum leak.
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Dieselchessy
New member
That’s easy enough to test. Disconnect the booster vacuum line and plug it.
Then try the brakes again and see what happens.
Id expect a vacuum leak big enough to kill the engine to be whistling.
It seems the usual thing is to forget to connect the vacuum line to the IAC or worse yet swap it with a coolant line.
Then try the brakes again and see what happens.
Id expect a vacuum leak big enough to kill the engine to be whistling.
It seems the usual thing is to forget to connect the vacuum line to the IAC or worse yet swap it with a coolant line.
brillo_76
Elite Member
Not always a whistle though. If its Super smooth idle, I wouldn't suspect a vaccuum leak. Mostly the idles a very rough when a vacuum leak are occurring. As any air entering the intake that's not measured causes issues.
I guess the brake booster could have failed and that sure would cause major vacuum leak but if this was the case. You should hear that leak.
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