2000 Mustang 4.6 Problems, (supercharged)

[peak-j]

Been a long time since i posted, im posting for a friend that is having problems with his mustang. Here is what i can tell you about it. 2000, 4.6 supercharged. It has an SCT computer with tuner, trick flow heads, typhoon intake, 88lb. injectors, D1 procharger. The engine was just built in oklahoma city, dynoed, brought home, then he drove it a couple days and it developed a bad miss. Now it only misses after it warms up, then the engine temp starts climbing. Greatly appreciate any help on this. Thanks

 

[trinity_gt]

Pull the plugs. Check their condition. While they're out do a compression test. The fact that the engine temp starts climbing is alarming...

 

[peak-j]

I guess the car set an evap code is what ive been told recently. Correct me if im wrong, the fuel tank vent line runs to the evap canister? If the tank was not venting, could it cause it to starve for fuel, run lean and start to overheat? He is supposed to be pulling the plugs and doing a compression check like trinity said. Thanks for any help

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[rconaway]

Here is an odd answer. Check the alternator. Although it doesn't explain the temperature, apparently some diode in the alternator burns out and even though it works, the car still misses. Just learned that one today.

 

[Clayton302]

Coil packs can be suspect but the heating up is odd. Possible head gasket failure. Like stated a few above compression check. update if you get a chance.

 

[Clayton302]

oh and check fuel pressure should have a gauge if supercharged.

 

[peak-j]

Ok, i will check with him on fuel pressure! Thanks

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[N8Dogg98]

+1 on the alternator... I had a failing diode on my alternator and it would start and idle fine, but after driving for a few minutes would be down on power, develop a bad miss, and wouldn't accelerate (headlights would also dim). Turned out to be a bad alternator and with a new one it ran like a champ

Real easy way to tell is whether or not the electrical components start to die off when this happens (headlights, stereo, etc). If they are still operating fine, then it most certainly isn't the alternator.

 

[Clayton302]

That would be very easy to diagnosis and would hope he would not be on a forum asking about a bad Alt.