1993 Ford Thunderbird SC : no start :

Tiny
93SC
  • 1993 FORD THUNDERBIRD

138,000 miles auto

after doing my headgaskets the car wouldnt start, found out that I might have crushed the wire that goes from the starter to the relay on the fender while I changed my engine mounts, jumped the starter with a new wire, now the car cranks from the ignition switch but no start.

i could hear my fuel pump kick on when I turn the switch, I get fuel at the fuel rail just dont know how much psi, I sort of checked an injector with a test light and I didnt see it blink, maybe im thinking the wire from the ecm that controls the injectors maybe got crushed too? Anyway to bypass the ecm to start the car?

also it started it about two times but ran really rough wanting to shut off, I was getting between 5-10 hg vacuum somestimes zero, im supposed to have 20 at idle, would the car run with a big vacuum leak?

thanks alot

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Wednesday, August 29th, 2007 AT 5:56 PM

21 Replies

Tiny
POET042005
  • MEMBER

First thing I would do is check the wiring that you said may be damaged, you want to verify that they are good and not damaged before you do anything else.

A car will run with a vaccum leak how well dpends on the car. Car will also start with a bad injector again how well depends on the car.

Try this pour a shot of gas into the throttle but before you start the car turn the ignition key on and off about 5 times to prime the fuel pump.

Your next step if the wiring checks out will be to have the fuel pressure tested. Car not running I believe should be around 30 to 45 psi's. Problem just may be fuel related.

If the car runs at least a few seconds after you pour the shot in the throttle this at least gives you an idea that the problem is fuel related. You just have to verify that it is.

Sounds like you have a mess on your hands Will try to help were we can.

Keep us posted

Richard

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Thursday, August 30th, 2007 AT 10:02 AM
Tiny
93SC
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Thanks for the reply, the times I started the car was by pouring gas in the throtle body and one time it kept running even after the gas evaporated, also it doesn't let me check for codes, so I think the ecm might be on limp mode I will check the wiring next.

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Thursday, August 30th, 2007 AT 3:54 PM
Tiny
POET042005
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Let me no what you find would love to know. Im just curious how you may have damaged the wiring. I've done quite a few heads and from what I recall the wiring is to the side of the engine compartment out of the way.

I am a fellow T-bird fan myself.

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Friday, August 31st, 2007 AT 7:58 AM
Tiny
93SC
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Man im not good with electrical stuff, the previous owner did a lot of weird wiring himself, alarm and all that, the car is a wiring mess, everywhere I read it says the ecm should be inside the kickpanel in the passanger compartment, well my ecm is in the trunk just laying there.

I looked at the wires under the hood and I didnt see anything out of the ordinary. Im kind of going crazy trying to fix this thing, I called a mobile repair company to see if they could come look at it and they told me $120 minimum just to look at it. Thats crazy, I disconnected the ecm for a minute and car still cranked normal!, Is this normal?

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Friday, August 31st, 2007 AT 12:18 PM
Tiny
93SC
  • MEMBER

Got this electrician to stop by, he completely removed the cheap aftermarket alarm the previous owner installed which was a mess, and by squirting fuel in the throttle body got the car started immediately he told me that the car had bad gas, it smells rotten.

Seems that the car sat for a while and the old gas didnt completely burn off, he said that it sounded like it was running on the wrong octane and that's why it was running bad, also the supercharger bypass kept opening and closing really fast? No clue

tomorrow im going to drop the tank and clean it out and while im there I think im going to change the fuel pump

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Friday, August 31st, 2007 AT 8:15 PM
Tiny
POET042005
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Thanks for letting me no the scoop. I got another question for ya. Now that the car is running when it sits for a few hours dose it start right back up for you. And also before it started did it ever choke through the throttle while turning it over.

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Saturday, September 1st, 2007 AT 3:37 PM
Tiny
93SC
  • MEMBER

No when it sits for a while it wont start back up, have to crank it for a while, yes it did choke through the throttle.

Yesterday I didnt drop the tank, I jumped the fuel pump by the fp relay harness and disconnected the line at the fuel filter, pumped all the gas out got some seafoam in the tank and pumped some more out, it was dirty but not that much.

Now I have to get rid of the alarm light while im cranking, have to find the keyless entry code, and a huge vacuum leak somewhere

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Sunday, September 2nd, 2007 AT 3:01 PM
Tiny
POET042005
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I have a 1994 t-bird that has a 93 Trans a 1990 engine 3.8 with rewired harnesses and vacuum lines all configured I have the exact same problem. Because the car was a personal project I decided to put together I thought it was just something I miss-configured but since you have the same car and I'm sure the same wiring diagram (except the vacuum diagram) I guess the issue is not a miss-configuration. I have not had time to work with my car but I flushed the tank and change fuel pump, pressure regulator filter but no luck. I'm gonna go buy a code scanner when I get time (my children misplaced my last one GO figure) and also I'm gonna check my fuel pressure the pressure could still be outta specs. I have not change the injectors yet. Last step of course if I don't get any error codes from the computer will be to change the EEC (electronic engine computer) I will keep ya up dated once I finish all my diagnosis.

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Wednesday, September 5th, 2007 AT 7:08 AM
Tiny
93SC
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Cool thanks, I bought a code scanner from autozone but for some reason I cant read codes, I also tried the paper clip method to read codes but doesnt work either, I heard the ecm goes to limp mode when something isnt working right. I resealed all the intercooler connections and ill update when I try to start it tomorrow

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Wednesday, September 5th, 2007 AT 5:20 PM
Tiny
POET042005
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If the engine computer has no error codes stored insidethe scanner should still read code 12 which means it does not detect any errors.
You'll need to start the car again and let it run for and let it worm up before it will record any possible fault codes in the system.

Did you disconnect the ecm, if so that may have erased any codes that may have been stored in the computer, also does the check engine lite come on once you turn the key to the on position.

Thank you for the constant reply I really apreciate it.

Richard

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Thursday, September 6th, 2007 AT 10:16 AM
Tiny
93SC
  • MEMBER

I disconnected the ecm like two days ago but even before that it wouldnt read codes, its just like the process cannot be completed because something is interrupting the test, I wouldnt get a code 12 because this car gives 3 digit codes, will try to start today again thanks

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Thursday, September 6th, 2007 AT 3:52 PM
Tiny
93SC
  • MEMBER

Ok tried to start today, wont start ! The supercharger makes a loud squeel while cranking and the boost gauge goes to 5 psi while cranking? This thing is making me go nuts, I obiously got a fuel problem because it cranks only when I put fuel in the throttle body, got good pressure at the rail, dont know what else to check?

Also + battery terminal started smoking, im about to junk this crap

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Friday, September 7th, 2007 AT 2:36 PM
Tiny
POET042005
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Don't give up yet I felt the same way. But as I was saying I have to check two more things before I let mines go I want to change the EEC and all my fuel injectors.

Even though it starts after giving the car a shot, it could be electrical because the fue pressure to and from rail is synchronized. The fuel injectors are like selonoids that operate from electrical current. I'm gonna keep ya posted.

Problem for me is I am a part time student and wor full-time so My time is limited bare with me.

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Monday, September 10th, 2007 AT 5:54 AM
Tiny
POET042005
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Even though I have a few things to check still I am looking for suggestions on 93sc's problem with his 93 T-bird any one have any other suggestions that I may be missing.

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Wednesday, September 12th, 2007 AT 8:44 AM
Tiny
93SC
  • MEMBER

Hey thanks for making the other thread about this one, I really appreciate it

i found a big vacuum leak at the return plenum where it meets the intake manifold, I tightened all the bolts and reasealed all the tubes, but same deal, will only try to start if I shoot fuel in the tb but I always hear my fuel pump prime and get good pressure at the rail, this is what has me lost.

It just cranks and cranks

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Friday, September 14th, 2007 AT 1:45 PM
Tiny
93SC
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Ok I sealed the leak that I found, cycled the ignition 5-6 times, started no leaks sounded perfect, car stopped running after 1 minute, sprayed some fuel in the throttle body, and car ran again at idle for like 8 minutes.

Idle was at 1000 rpm, and temp was in norm but after 8 minutes temp went to the m of norm and the fan didnt come on, so I turned it off. It takes a lil bit to get it to start and makes some weird noises, like it tries to idle normally but kind of stalls and then picks up normal after 10 seconds, but atleast its running, im going to drain all the coolant and replace with new just in case because I had some water in there also.

Still didnt let me check codes while running car just accelerated, I think I might have some problems with my eec too, let me know how the injector change helps you

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Saturday, September 15th, 2007 AT 2:17 PM
Tiny
POET042005
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Well I finally found the time to work with the injectors but that didn't help. I am now focused on the last thing which is the EEC. I am getting fuel to rail but there is a problem with fuel pressure so my next step is the EEC. I have been trying to get other opinins on this but no one can seem to help although I have gotten the same response from a another person that said it may be the engine computer.

After this I may just throw in the towl. I found out the car has an oil pressure problem with is an internal problem. Im gonna still gonna try this last issue just out of curiousity.

Hey thanks man for the constant update I really appreciate it

Richard.

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Monday, September 17th, 2007 AT 12:04 PM
Tiny
CBRUCE
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Was there ever a out come on the eec I have a eec that is doing the same thing giving me nothing when the engin is running any ideas

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Saturday, September 22nd, 2007 AT 9:26 PM
Tiny
93SC
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Changed the eec relay under hood and fuel pump relay and now it works :)

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Friday, October 5th, 2007 AT 2:59 PM
Tiny
POET042005
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Good job but I got a question 4 ya did you mean ECM relay instead of EEC relay Look online for it and can't find it under EEC relay.

I thank you 4 getting back with me.

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Monday, October 8th, 2007 AT 3:29 PM

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