1993 Mustang LX Starting Problems, fuel related? - Ford Mustang Forum

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post #1 of 5 (permalink) Old 08-17-2010 Thread Starter
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Angry 1993 Mustang LX Starting Problems, fuel related?

Argh.. where to start. First bare with me I'm a chick and more power to the girls that know way more about cars then I do but i need help!

I have a 93 mustang Lx. The car starts and runs fine one moment and then wont start the next. Sometimes you can hear the fuel pump kick on, sometimes you cant. Sometimes after switching the intertia switch back and forth the car will start..but thats followed after a clicking noise in the engine. Could this be the intertia switch wiring being bad?

Step 1. Replaced the fuel pump
Step 2. Replaced the intertia switch
Step 3. To replace the fuel pump relay, WHERE IS IT?

Now I have heard that the fuel pump relay is in the CCRM and that you cant replace the relay itself, you must replace the whole unit. If this is true then why do they sell the fuel pump relay at auto stores? If this is not true and my cars fuel pump relay is not located in the CCRM - then where is it???

Ok.. so once I find it and replace it and still have issues then we go to step 4.

Step 4. Replace Distributor because the PIP is bad?
If that fails...
Step 5. Replace the ignition module?
If that fails...
Step 6. Blow up car?

Sorry that was so long..but that's where I'm at and headed. Your input would be great.

Thanks ~ Chel

Last edited by Stang_on_You; 08-17-2010 at 08:44 PM. Reason: after thoughts
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post #2 of 5 (permalink) Old 08-17-2010
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chel, get a fuel pressure guage and check fuel pressure key on engine off then engine idling then engine idling while opening the throttle. that will tell you if its the fuel pump. what are you calling an inertia switch? the clicking under the hood is different relays. i can't remember for sure but i think the fuel pump relay is under the hood. if you have an advance or auto zone they have haynes manuals with wiring diagrams that will let you know where the fuel pump relay is located. also i had a 91 Z-28 that did the same thing, ended up being the distrib module. but thats brand C stuff, you never know though. the fuel pressure check should let you know whether to look into ignition problems or not.

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post #3 of 5 (permalink) Old 08-17-2010
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Checking fuel pressure will help you a lot. I'm pretty sure the 93's came with the 8 plug heads and have two coil packs. So that would mean you don't have a pip or tfi unless the car had another engine installed into it. The relay should be in car if im not mistaken, but then again i could be wrong. and is the car an auto or manual? Maybe the neutral safety switch wire is getting moved around? Just a thought.

1986 Ford Thunderbird Turbo Coupe
Mods: CAI Setup, FMIC w/ 2.5" piping, Blow Thru Vam Setup, Boost Controller, Innovate AFR Gauge, Kirban AFPR, Boost cranked to 22psi, Greddy Type S BOV, T5 trans swap
Future mods:
Walbro Fuel 255lph pump, ported intake and exhaust, 3" exhaust with cat no muffler.
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post #4 of 5 (permalink) Old 08-18-2010
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OK first thing you have to do is find out what you are missing. Spark!! FUEL!! If you are loosing fuel preasure and the pump does not run because of electrical problem or a voltage supply problem. It must be monitored. It can be done at the inertia switch. Inatall a test lite to the in portion of the switch and monitor it. The light should come on and time out when you key the ignition and not running. The light comes on then times out. If this does not happen the IRCM may be bad. You can install a seperate relay if the IRCM is bad but its easier to just replace the defective unit. Hope this Helps Peace Tom


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post #5 of 5 (permalink) Old 08-18-2010
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IRCM is a black box located on pass side strut tower in engine comp get a test light to test inertia sw
here is wiring dia http://rothfam.com/svo/reference/92-93Mustang.pdf you can also check voltage at relay with these dia
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ccrm , fuel pump , fuel pump relay , intertia switch , start issues

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