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Old 15 Aug 2012, 01:24 pm
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Default Troubleshooting help

Hi all, just purchased a 2001 PT Inferno Red, with only 79k miles. I am having a problem with it missing/stalling at highway speeds among other issues. I have seen some forum posts that give the same symptoms I am having but does not have a fix.

When car sets overnight : runs great for about 20 minutes then problems start.

When car is at temp/after first 20 minutes:
1) while driving, speedometer falls to zero, feels like engine engine misses, tach does not change.

2) when problem 1 starts happening, A/C work intermitten.

3) when stopped at light, engine almost dies, then surges also intermitten. When this happens you better have your foot firm on the brake or the car will surge forward 3 to 4 feet.

4) NO CODES listed on the odometer, I do not have a scan tool

All of these symptoms seem to be related, either everything work, or all these are happening.

What I have done:

Changed input speed sensor
Changed output speed sensor
Changed TPS sensor ( per dealers diagnosis)
Checked and cleaned battery terminals and all chassis grounds.

I believe I have a faulty PCM,

Any suggestions?

Thank you in advance for any advise you can give me on these problems.
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Old 15 Aug 2012, 01:55 pm
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Smile Re: Troubleshooting help

I would say you're right on the money, it does sound like a PCM issue, however I would check all the wiring going to it just in case you have an intermittent break in one of them
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Old 15 Aug 2012, 02:28 pm
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Default Re: Troubleshooting help

I don't think there is a problem in the wiring, because it will consistently run fine when everything is cold. I think when the internal core of the PCM reaches a certain temp is when the problems start. Thank would take about 20 minutes from a cold start for the engine compartment heat to reach the core. Thanks or the response.

Gary
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Old 15 Aug 2012, 05:30 pm
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Default Re: Troubleshooting help

Is the cooling fan working like it should?
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Old 15 Aug 2012, 05:47 pm
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Default Re: Troubleshooting help

Yes, I checked both fan speed relays and wiring. The low speed relay pins were a little discolored but everything else looked fine. I did verify the the fan operated correctly in both speeds as well.
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Old 15 Aug 2012, 06:05 pm
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Default Re: Troubleshooting help

Do the key dance and see what you get! If no codes it will read done. If there is no codes I would be inclined to agree on the pcm.
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Old 19 Aug 2012, 06:02 pm
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Default Re: Troubleshooting help

OK WE HAVE A 03 PT NON TURBO WE JUST CHANGED THE PLUGS AND THE WIRES AND NOW THE CAR RUNS RUFF AND WANTS TO STALL THE CK ENGINE LIGHT COMES ONE WE RUN A CODE TEST SAY P2305 WHICH IS PLUGS,WIRES OR COIL PACK WHICH WE HAVE CHANGED ALL THREE PARTS AND STILL DOES THE SAME THING CAR RAN FINE BEFORE JUST WANTED TO DO TUNE UP HADNT DONE ONE SINCE OUR DAUGHTER BOUGHT THE CAR A YEAR AGO. WHAT DO YOU SUGGEST. WE ARE AT SUCH A LOSS WITH THIS PROBLEM
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Old 19 Aug 2012, 10:57 pm
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Smile Re: Troubleshooting help

Quote:
Originally Posted by banannabug42 View Post
OK WE HAVE A 03 PT NON TURBO WE JUST CHANGED THE PLUGS AND THE WIRES AND NOW THE CAR RUNS RUFF AND WANTS TO STALL THE CK ENGINE LIGHT COMES ONE WE RUN A CODE TEST SAY P2305 WHICH IS PLUGS,WIRES OR COIL PACK WHICH WE HAVE CHANGED ALL THREE PARTS AND STILL DOES THE SAME THING CAR RAN FINE BEFORE JUST WANTED TO DO TUNE UP HADNT DONE ONE SINCE OUR DAUGHTER BOUGHT THE CAR A YEAR AGO. WHAT DO YOU SUGGEST. WE ARE AT SUCH A LOSS WITH THIS PROBLEM
I would suggest that you re-fit the old ignition leads, or replace them with a known good set. It sounds to me that one of the new leads is not quite making connection at the coil pack or plug. Either that or the coil pack or wiring to it has an issue. You should really start your own thread with this if you want folks to reply to you
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