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Old 08-08-2012, 12:03 AM
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misfire question&a compression question

On my dd its obd1&dosnt throw any misfire codes but it shakes a bit@around 45 when the tcc locks up.Not sure 100% if its a mis but I know that's a sign So I replaced everything I could think of&still there so I'm gonna do a compression test next What my question is shouldn't my rpms jump all around if I have a mis?
Here's my next question on my last vehicle I had a bad mis&ended up being a burnt valve...I pulled the head &got it worked over then like a week later I threw a rod.My old man told me sometimes when you get new heads or a valve job the lower end can't handle it&should be worked over to.My old mans mind isn't as good as it used to be so is this true?Can someone inlighten me please?
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Old 08-08-2012, 04:13 AM
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What you believe to be a skip is more than likely torque converter shrudder.
This makes the vehicle shake when the converter clutch locks up because due to wear it will no longer fully lock. It's locking and unlocking seconds apart and that's what causes the feeling it's got a skip.
Take the car down a road that don't see much traffic, if you can see to it no one is behind you. Go down the road and place your left foot lightly on the brake pedal but not far enough to cause the brakes to slow the car down and see if the shake occurs. If it doesn't it's because the torque converter clutch isn't locking, your foot on the brake pedal prevents it from locking by causing a break in the circuit. If it still shakes then you can investigate under the hood the cause of the skip. If it does prove to be the torque converter, all you can do to stop it is disconnect it on the tranny, or disconnect the switch at the brake pedal. However without lockup the tranny will run hot quickly and burn it up due to a unefficient torque converter design. Lockup converters didn't have to be efficient with a lockup design. So if the car doesn't have a external tranny cooler you'll have to add one to prevent it from burning it up. If you count on the radiator cooler to keep it cool it won't last long.
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Old 08-08-2012, 04:53 PM
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Quote:
Originally Posted by DoubleVision View Post
What you believe to be a skip is more than likely torque converter shrudder.
This makes the vehicle shake when the converter clutch locks up because due to wear it will no longer fully lock. It's locking and unlocking seconds apart and that's what causes the feeling it's got a skip.
Take the car down a road that don't see much traffic, if you can see to it no one is behind you. Go down the road and place your left foot lightly on the brake pedal but not far enough to cause the brakes to slow the car down and see if the shake occurs. If it doesn't it's because the torque converter clutch isn't locking, your foot on the brake pedal prevents it from locking by causing a break in the circuit. If it still shakes then you can investigate under the hood the cause of the skip. If it does prove to be the torque converter, all you can do to stop it is disconnect it on the tranny, or disconnect the switch at the brake pedal. However without lockup the tranny will run hot quickly and burn it up due to a unefficient torque converter design. Lockup converters didn't have to be efficient with a lockup design. So if the car doesn't have a external tranny cooler you'll have to add one to prevent it from burning it up. If you count on the radiator cooler to keep it cool it won't last long.

Awesome...I live in the country so I can do that tonite ...be back with results
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