Possible computer issues with my 04 V6. - Mustang Evolution

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Old 05-22-2014, 10:55 PM   #1
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Possible computer issues with my 04 V6.

Car stalls, stumbles, and backfires at normal operating temperature. Loses 90% of its power. The Tach needle jumps like crazy above 3K rpm. this where the majority of my issues start. transmission does not want to downshift properly to go into passing gear. Hence the stumble and stalling effects. SES light is on. Tried connecting my code reader to check the codes, but get an error message saying vehicle is not responding. I have checked all fuses for the DLC and they are good. Checked for power on all pins on the DLC using a guide from google and all voltage measurements are within range or specifications. I can switch the car off wait 5 seconds and start the car back up and it will run fine for about 5 minutes if I am lucky. Without being able to read the codes, I do not know what to do. Any help and ideas are greatly appreciated.
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Old 05-22-2014, 11:10 PM   #2
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Also, what effect will gutted catalytic converters have on my car? I am in an emissions free zone. At first, I thought the problem lied within stopped up cats, but I was terribly wrong. With no way to check my engine light for codes, I had to reply on basic and simple solutions. Now I am stuck and don't know where to go from here.
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Old 05-23-2014, 03:19 AM   #3
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Can you post a video so we can see how it acts?
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Old 05-23-2014, 07:31 AM   #4
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I will try.
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Old 05-24-2014, 12:30 PM   #5
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The video would not upload, so I posted it on my Facebook. Click the link to watch it. Privacy settings for the video have been changed so anyone can view it. Thank you for any help. https://m.facebook.com/story.php?sto...id=20531316728
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Old 05-24-2014, 05:00 PM   #6
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I cant see it cuz I dont do facebook.
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Old 05-24-2014, 10:13 PM   #7
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Reupload? couldnt see it even with fb.
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Old 05-25-2014, 07:21 AM   #8
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I'll try to YouTube it.
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Old 06-01-2014, 01:58 AM   #9
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Something new I noticed with the car is that the more gas it has, the better it runs. As the fuel level goes down the worse it runs. Now I try not to let it get below a quarter tank. Sounds like an issue with the EVAP system. But I am not holding my breath.
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Old 06-04-2014, 07:51 AM   #10
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My brother has a 2000 v6 and he described the same thing. If his car gets below a quarter tank. It runs worse

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Old 07-04-2014, 01:44 AM   #11
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Everyone I talk to says its the computer taking a crap. Auto Computer Exchange on Florida has it for about $400. Not looking forward to replacing it.


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Old 07-06-2014, 02:08 PM   #12
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Try the fuel filter and maybe pump? Sounds like your not getting fuel above that rpm maybe clogged filter or the pump isn't able to keep up with the engine anymore. There is also a fuel reset button try pushing it.


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Old 07-08-2014, 05:25 PM   #13
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Thank you for the tip. It is not the inertia switch in the trunk. Car won't run at all if tripped. Tried 20+ times with no results. Fuel pressure is good. Fuel filter is fine. When the car acts up, you can switch it off count to 5, start the car back up, and it will run fine for a little while longer. I think the computer is bad and I know the problem is partly caused by an EVAP leak. I may have a bad fuel tank pressure sensor. Other than that, It still gets me around town and to work. Just tired of pulling ovr every 30 minutes and restarting the car. Also, the hotter the outside air, the worse the car runs.

Thank you,
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