SERIOUS PROBLEMS --- ???s

[95.0Stang]

Alright on an 87 5.0 5spd, no real mods...turbo mufflers by previous owner.

2 MAJOR problems.

I have a parisitic power loss, jump the car, and it will run. Tested the alternator and get the normal voltage, new battery, and it tested normal. Leave the car for an hour, and nothing happens when I go to start it. No idea where the problem is coming from...

When the car is cool it runs fine, let it get up to operating temp, and hit 3500 rpm, and the thing just dies. It seems to be in conjunction of when the thermostat opens. What is happeneing here?

 

[super302]

Check grounds and vacuum leaks first

 

[jrichker]

Typically it is something draining the battery. Small things like glove box or courtesy lights are often the culprits. If you have an aftermarket stereo or alarm system, it is also suspect.

The ideal method is to disconnect the positive terminal, and connect a Digital Multimeter (DVM) between the positive terminal on the battery and the positive cable. Set the DVM on a low current scale of 2-5 amps if it doesn't auto range. Watch the current draw, and then start pulling out fuses. When you see a sudden drop in the current, that circuit is the likely culprit. Note that the computer, radio & clock will draw less than 1/10 amp to keep the settings alive.

Performance problems at 3000 RPM or more that occur only on a warm engine are usually related to a failing TFI module.