jknowles249

How do you know when your PCM is bad? Will your car even start? I put in a new starter a couple of days ago and during the process I touched a hot wire to ground. And after I got the new starter installed my car will barely even rev up let alone have enough power to drive somewhere. Any ideas on this? Electrical Mechanical?

Tims 88GT

to check for a bad computer, try to set the tps it will read 4.95 volts. but that could also mean it has a bad ground so check them.

jknowles249

OK! Isnt there some way to test for electrical shorts with a test light between your negative post and the negative cable?

Tims 88GT

sure, but i dont know how lol. i just take the grounds off and clean them.

jknowles249

So if the voltage at my TPS is anything but 4.95V, The PCM should be replaced?

PRO50SC

That is to test for a draw on the system.

PRO50SC

Clarify! News to me.

Tims 88GT

if its 4.95v or higher it could be a bad ground. if they are ok its the computer.

jknowles249

What the test light between the neg cable and post? Yea I know, would that affect my computer?

Tims 88GT

the tech at the ford dealer told me that. it was news to me to, but my tps did that when i fried my computer. he said it could be a bad ground to, now if u unplug your egr it will do the same thing.