Discuss 1995 Mustang GT won't start: (possible EEC problem) on AllFordMustangs.com, the place for Mustang enthusiasts.
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I have a 1995 Mustang GT with an automatic transmission. After installing the Tweecer, my car wont start. Here’s what happened:
I removed the EEC and installed the tweecer (with the battery disconnected of course.) After that I reconnected the wire harnesses and did a "read" from the tweecer to get my stock settings. After that I reconnected the battery and tried to start the car. All it did was crank and crank until the battery started to choke out. Didn't fire up.
So I disconnected the tweecer and tried again with nothing but the stock EEC..same deal. I double checked all the wire harnesses and noticed that I screwed up (not sure how badly yet.) Near the bottom of the wire harnesses and closest to the firewall (compared to the other bolts) there was a green bolt that held a red and black wire under it. It bolted directly to the side of the car. I can only assume it was some sort of ground wires. Well I somehow screwed up and managed to forget to put that back on. I screwed it back down and tried several more times but no luck. The tweecer could read the EEC, but the car would just crank both with and without the tweecer installed.
So now I have no idea what the problem is. I checked the fuses (in the engine bay and under the dash) just for the hell of it and everything seemed fine. When I turn the key to the on position, I hear the fuel pump kick in. I don't know what the problem is but I'm starting to think I fried the computer by screwing up and forgetting that one screw / bolt. I can't think of anything else that could be causing the problem.
I am correct in thinking that the green bold near the three wire harnesses was the ground correct? And by being a dumbass and leaving it off, there's a good chance I fried it? Any ideas what I can do to fix this? If it is the computer, where can I get a replacement besides a junkyard?
Try to do a EEC diagnostic, it is easy, rent a scanner at autozone, it will tell you if the EEC is fried.
If it is, i also think autozone can sell you one in exchange for yours.
I was actually going to get a scanner...but I wasn't sure if it would help. What would i get for an error code, if any at all, if the EEC is fried? I was thinknig it may just toss a bunch of false codes for other systems because that part of the EEC may be fried. Is there a possibility it could give me a code 11 even though it is fried?
When I turn it on, the fuel pump coms on for about 1 second then goes back off. That kind of leads me to believe that at least some portion of the computer is working properly. But the no-start thing realyl has me confused.
Might be a wire loose in the connector.
Maybe try going back to the basics, and checking for fuel (injectors firing?) and spark. One or the other is not happining (probably). Knowing which one it it, will make for an easier diagnosis.
'88 GT convertible, 5 speed, 3:08 gears, A9L Mass Air conversion. Mac shorty headers and H-pipe, Magnaflow catback.
Well I'm not really sure what happened... but here's the rundown of the night.
On the way home I grabbed some more autolite 24s figuring that my plugs maybe fouled. I figured worse case scenario, I'd have some extra spark plugs for the future.
As soon as I got there, I spalled on my code reader I bought earlier at auto zone and all I got was an EGR code, which was expected because the EGR is sitting in a box in the garage. I then pulled a random spark plug to see if it was founed (#6 plug) It looked fine although there was a strong fuel smell. I then had my sister crank it while I grounded the plug to get a spark. It had a spark too so I put it back in.
Then for the hell of it, I tried to start it using the Clear Flood method (WOT while cranking to keep teh injectors from spraying.) and the son of a ***** fired right up. I turned it off and on a few times and it fired up with no problems. So I disconnected the battery, put the twecer back on, reconnected the battery and tried again and she fired right up. I switched to position 2 on the tweecer and after about 1 second, my idle increased about 200 RPM. (which is what I set position 2 for.) As I left the engine running I could switch back and forth from the positions and second later, you coudl ehar the change in the engine.
So in the end, I still ahve no clue wtf was wrong. if I had to guess, I would say that I must have flooded the engine and fouled the plugs with fuel (not sure how.) Overnight they must have dried off enough to get a spark, and the Clear Flood / Flood start took care of the rest.
Finally the tweecer is on and working as good as expected. Now I can finally move forward with this and get a good tune going.