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  #1  
Old 11-10-2010, 06:25 PM
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taylorbr taylorbr is offline
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Occasional Engine Stall Shifting to Reverse

Thanks in advance for any light people can shed. The engine occasionally (once every 5 to 10 attempts) quits after I shift from park to reverse. And there is always a few second lag shifting from park to reverse and reverse to drive. I changed out the fluid about 4,000 miles ago and have a 1994 so I don't think it could be the faulty gasket. Original transmission, no lights or codes, and it feels pretty good going forward.
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Old 11-10-2010, 06:33 PM
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Re: Occasional Engine Stall Shifting to Reverse

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Originally Posted by taylorbr View Post
Thanks in advance for any light people can shed. The engine occasionally (once every 5 to 10 attempts) quits after I shift from park to reverse. And there is always a few second lag shifting from park to reverse and reverse to drive. I changed out the fluid about 4,000 miles ago and have a 1994 so I don't think it could be the faulty gasket. Original transmission, no lights or codes, and it feels pretty good going forward.
When you say. "it quits" does it just quietly die, or does it bump into reverse and stall?

Harvey.
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Old 11-10-2010, 06:36 PM
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Re: Occasional Engine Stall Shifting to Reverse

Bumps into reverse and immediately stalls.
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Old 11-10-2010, 06:52 PM
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Re: Occasional Engine Stall Shifting to Reverse

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Bumps into reverse and immediately stalls.
And it does not do the same when you go from P to D?

Harvey.
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Old 11-10-2010, 07:53 PM
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Re: Occasional Engine Stall Shifting to Reverse

It has never stalled going from park to D and the bump seems a lot less of a bump than going into reverse.
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Old 11-10-2010, 09:34 PM
oab_au oab_au is offline
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Re: Occasional Engine Stall Shifting to Reverse

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It has never stalled going from park to D and the bump seems a lot less of a bump than going into reverse.
The test for checking the lag time for P to N and P to R, says, 1.2seconds for P to N,. 1.5 seconds for the P to R. engine warm and idling.
Does it feel that yours is the same as the above, for both, or is the P to R shift longer?

What ever it is, the idle solenoid is not keeping up with the speed change.

Harvey.
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Last edited by oab_au; 11-10-2010 at 09:35 PM. Reason: Left out above.
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Old 11-13-2010, 11:06 PM
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Re: Occasional Engine Stall Shifting to Reverse

Thanks for the help Harvey.

I was checking into this more while driving today. As I recall, the engine has only stalled when the car was cold. This could also be why I never have seen it stall going from P to D because I rarely park such that I can go forward with the car cold.

During today's driving around I noticed that the time to shift gears if fine when it's warm, but much slower cold.

Is this something that I should worry about fixing? Right now it's more of a nuisance (and occasional embarrassment) than a big problem.
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Old 11-14-2010, 02:53 PM
oab_au oab_au is offline
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Re: Occasional Engine Stall Shifting to Reverse

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Originally Posted by taylorbr View Post
Thanks for the help Harvey.

I was checking into this more while driving today. As I recall, the engine has only stalled when the car was cold. This could also be why I never have seen it stall going from P to D because I rarely park such that I can go forward with the car cold.

During today's driving around I noticed that the time to shift gears if fine when it's warm, but much slower cold.

Is this something that I should worry about fixing? Right now it's more of a nuisance (and occasional embarrassment) than a big problem.
There are some things the can go wrong in the box that would cause a slow reverse engagement. Thats why I suggested that you check the lag time.
You need a stopwatch, engine/trans, warm and idling. Start the time as you pull it into gear, stop when you feel the engagement. If both are slow, it can just be low line pressure. If the P to N is ok, but the P to R is slower, it can be a problem starting.
If the lag time is OK, then it is likely just the Idle control valve a bit stuck and responding too slow to hold the Idle.

Harvey.
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  #9  
Old 11-14-2010, 08:39 PM
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Re: Occasional Engine Stall Shifting to Reverse

I should have added, that if the P to R is longer than 2 seconds, the torque control will have turned back off, so the reverse is engaging with all cylinders working. That will cause a hard engagement that may cause the cutout.

Harvey.
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97 Liberty GX Auto sedan. 320,000Kls.
04 Liberty 30R Auto Premium. 92.000kls.
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