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Old 10-10-2010, 09:46   #1 (permalink)
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99 sable bad PCM?

I have a 99 sable OHV 3L. It has a misfire on cylinder 1. Coil pack, plugs, wires and injector were changed, the fuel rail system was cleaned. Don't notice the mis when I drive it. I was told it could be caused by bad PCM. It now started to develop a trans problem. When the [LINK REMOVED BY MODERATOR] speedometer reaches 40 mph, it goes wacky then stops working. Soon after that the trans starts to slip once and a while. My question is can all this be caused by a bad PCM? Thanks in advance

Last edited by tbird100636; 10-10-2010 at 19:12. Reason: LINK REMOVED FROM OTHER FORUM
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Old 10-10-2010, 19:16   #2 (permalink)
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Exclamation Re: 99 sable bad PCM?

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Originally Posted by xoplex View Post
I have a 99 sable OHV 3L. It has a misfire on cylinder 1. Coil pack, plugs, wires and injector were changed, the fuel rail system was cleaned. Don't notice the mis when I drive it. I was told it could be caused by bad PCM. It now started to develop a trans problem. When the [LINK REMOVED BY MODERATOR] speedometer reaches 40 mph, it goes wacky then stops working. Soon after that the trans starts to slip once and a while. My question is can all this be caused by a bad PCM? Thanks in advance
NO!!! For the trans slipping and speedo going wacky the most likely cause is the Vehicle Speed Sensor on the right side of the trans. near and slightly above the the right axle. Will also set a DTC in the PCM. Please refer to my last reply in your previous Misfire thread:

Quote:
Originally Posted by tbird100636
Even with good compression, you can have leakage in a cylinder that causes a misfire. Do a cylinder leakdown test on Cylinder # 1. You could have a valve sealing issue, a piston/ring/cylinder issue, or a cylinder head issue.
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