Chrysler New Yorker not shifting

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Old 07-22-07, 07:12 AM
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Chrysler New Yorker not shifting

We have an 89 Chrysler New Yorker and it's not shifting anymore. The transmission is clean; clean filter and fluid, etc. I'm curious as to what would most likely cause the car to not shift. When driving, if you let off the accelerator, it drags and quickly slows down also. Anything would be great. Thanks.
 
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Old 07-22-07, 07:16 AM
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3.0L engine, automatic transmission
 
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Old 07-22-07, 07:18 AM
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I had an 89 dodge shadow (similar drivetrain) with a V6 a few years back and it did the same thing. Turned out to be a valve on the transmission (think it was called the throttle valve) was siezed. Cost about $75.00 to have my mechanic free it and get things going again.
 
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Old 07-22-07, 07:20 AM
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Would that prevent it from shifting?
 
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Old 07-22-07, 07:44 AM
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My car would not go past second gear and it had the same motor , 3.0 L
 
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Old 07-22-07, 11:05 AM
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Does it start out in first gear and stay there? How many miles are on this car?

Have you tried to run up the rpm's beyond the normal shift point and then release the gas pedal to suddenly increase manifold vacuum to see what happens?

Maybe this load you feel is causing the transmission to want to stay in low gear as it (vacuum) senses the load - hence my 2nd paragraph. Try it once and see if it doesn't shift then.

On cars at least years ago, the shifting vacuum device that screwed into the transmission was called a vacuum modulator, from my recollection. I had to replace one or two of these on my cars that would not up shift.
 
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Old 07-25-07, 06:23 AM
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Any more suggestions/ideas?
 
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Old 07-25-07, 06:42 AM
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You didn't answer my LAST questions.
 
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Old 07-27-07, 09:45 AM
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Originally Posted by ecman51` View Post
Does it start out in first gear and stay there? How many miles are on this car?

Have you tried to run up the rpm's beyond the normal shift point and then release the gas pedal to suddenly increase manifold vacuum to see what happens?

Maybe this load you feel is causing the transmission to want to stay in low gear as it (vacuum) senses the load - hence my 2nd paragraph. Try it once and see if it doesn't shift then.

On cars at least years ago, the shifting vacuum device that screwed into the transmission was called a vacuum modulator, from my recollection. I had to replace one or two of these on my cars that would not up shift.
Yes it stays in first gear. It has 145k miles on it. We haven't tried that and this car doesnt have a vacuum modulator I do believe.
 
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Old 07-27-07, 10:13 AM
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I came across this just now while searching on Alldatadiy.com, it's the transmission control system relay, This relay is operated by the A-604 controller. Its purpose is to make operating voltage available to the solenoids and switches located in the Solenoid Pack. When the Controller opens the relay, voltage is taken away from the solenoids and the transmission goes into a limp-in mode. While in this mode, only second gear, reverse and neutral are available.

This relay may also be referred to as the Safety Shutdown Relay.
 
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Old 07-27-07, 12:15 PM
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and correction to the post before the last one, I thought that it stayed in first gear but it may be 2nd gear that it's in. Not sure. Just stays in a low gear.
 
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Old 07-29-07, 08:04 AM
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bump.................................
 
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Old 07-29-07, 08:57 AM
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I think we all presumed you solved your own problem from your post 3 posts down. Are you looking for confirmation? I suppose your troubles coud be something more major in the valve-body, but I bet it is something like what you cited, since you say you have no vacuum device, per se.
 
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Old 07-29-07, 10:35 AM
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Well I don't know what it means. I mean I understand that the relay is open but my question is why is it open? What is making the TCM to tell the relay to open.
 
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Old 07-29-07, 11:44 AM
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Well, it is not from the TCM to TELL IT to open, as then that issue/code would not come up on code readout because that is part of the function. It means that it is open, as in - wire inside unit burned in half. That sort of thing. Like the relay is either shot itself or there is some bad connection or broken wire leading to it.
 

Last edited by ecman51; 07-29-07 at 12:02 PM. Reason: erased Quote
  #16  
Old 07-29-07, 11:51 AM
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When the Controller opens the relay, voltage is taken away from the solenoids and the transmission goes into a limp-in mode.
 
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Old 07-29-07, 12:02 PM
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I'm not sure how the device is supposed to work, normally, and maybe someone else can help/explain it. I just covered theory in my last post to address what can happen in open circuits.

If nobody else joins in here, then if I were in your shoes - before doing all kinds of searches on net for other messageboards/'ask the mechanic' type boards/opinions - I'd call some auto parts stores and ask them if they are familiar with when they should be energized or not, etc. I know when I called up one of our parts stores (we have like every national chain here), one of the employees was an ex-Dodge mechanic for 15 years and was able to REALLY help me out. Sometimes you get lucky. Some of these guys are young and don't know a lot yet, while others really know their stuff.
 
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