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Discussion Starter · #1 ·
Hey Guys, heres the lowdown on whats happening....

The other night, I was driving over to my friends house for new years...drove there, no problems....started the car up to leave late night and it had a misfire throughout the rpm range (where it had no problems when it shut off, not sure if it was one or two cyls, I would think if it was two it would barely run, well this will run and I can go 60 mph in it, just misses throught the range) it has been smoking horrible, and the smell of unburnt gas is horrible! Also it used about 45 miles worth of gas in 27 miles and left me stranded ;-) Lovely, the plugs were changed about a year and a few monthes ago, the wires never I think, its at 125k miles on a 94 4.6 Tbird lx....not sure if I should go the wire or the coil route first or anything else it could be, but the problem was very abrupt and all of a sudden, no symptoms leading up to it... what should i do?

Chris
 

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Since you have a 94 it sounds like the injector drivers in the EEC have gone south and are holding multiple injectors open all the time. You can verify this either with a noid light or a multimeter just look for contant voltage at the injectors rather than a pulse. If that's it (very common on the 94's usually around 75,000 miles) replace the EEC and change your oil you probably have a fair amount of fuel contamination in the pan. Pray you haven't clogged the CATS in the process.
 

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As I said in the PM one way or another you need to determine if any of your injectors are getting 12V constant. If they are you need to replace the EEC.
 

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It's probably the computer as Tim said. I had this go bad 2 times. Try and replace with a 95 computer. Also, to further emphasize what Tim said, do this ASAP for the Cats won't like this extra fuel for very long
 

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Discussion Starter · #6 ·
I unplugged the MAF and the car sounded the same the miss was still there...the only thing was that the idle rose to 1k instead of 500 rpms, does this mean the MAF?

Also the car is not smoking horrible visibly, just smell wise, not the type of bogging you would see if the car was running pig rich black smoke, this is light white smoke, just alot more than normal......the idle sounds normal at normal rpms, just a miss all the way thru the rpms....

do you think its just the MAF if the idle just went up but acted the same with the miss still...?
 

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No if the MAF was bad it would clear when you unplugged it. EEC or REALLY bad plug wires in my opinion. Do you have fuel dripping out the pipes
 

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Discussion Starter · #8 ·
Hey

Ok checked the pipes, I drove it around the apt comp, and geuss what I think its out of gas(8 or 9 miles on 2 gals, and one ex pipe had a clear liquid coming from it that smelled kinda like something, not sure if it was condensation, the other pipe had a black sludge dripping fromm a hole in the muffler that def smelled like gas, maybe the gas cleaned the gunk out of the pipe? but it was def smelled like gas, again the car died before I had a chance for it to warm up so the other pipe may be just condensation, but the second one was def gas....what do ya think?
 

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I think your EEC is toast but withoiut testing the injectors I can't difinitively say thats it
 

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Discussion Starter · #10 ·
Hey!

How much do you think a noid light is, and which one is cheaper and easier to use, for someone who is unfamiliar with both the noid, and a multimeter?

Also whast the diff between the 95 pc and the 94? what makes one better, is the 95 a direct replacement?
 

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A noid light is easier because it just plugs in to the injector harness but either is pretty easy. There are two wires in each injector plug and a multimeter has two probes so you just set it to DC voltage and stick one probe in each hole of hte connector. 94 or 95 are direct replacement and are the only two years you can use. In 96 they went with a different style (internal EDIS) and they will not work. No advantage to 95 over 94 if they are rebuilds....if you are getting one out of a junkyard go for the 95 as they didn't seem to have the injector driver problem.
 

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Your check engine light ever come on?

Unplugging the MAF sensor should have tripped it also.



.
 

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When I had my computers go bad it was the same deal with the bad gas mileage, gas and sludge coming from the exhaust, and the white smoke which is consistent with a very rich running condition, and running rough. Do you know anyone with a 94/95 computer? If you do, then just try switching them quickly and see if it runs better (it will still smoke until all the unburnt fuel is gone)
 

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Discussion Starter · #15 ·
Hey!

No I dont but I got the noid light and I am gonna check the plugs and coils tommorow.....Ill let you know what happens............
 

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autozone sell remanufactured pcm for about 120 bucks
 

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Discussion Starter · #17 ·
Well guys, did the noid light test...the 3rd cyl back when facing the engine on the left seide was a solid light, all the rest were blinking...I geuss that means I need to replace the pc? This also makes sense cause the left side exhaust pipe was the only one I smelled gas dripping on....what do I do now? where is the computer located at on the car and what tools do I need to take it out....? Is there anything else I need to do with the car besides the ECC?
 

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Discussion Starter · #19 ·
so basically its on the pasenger side kick panel, same place where the ones are in the 93 stangs? Is the pc what needs to be done?
 
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