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1994-1995 5.0 Mustang SN95 Tech Forum

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Unread 06-19-2010   #1 (permalink)
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Default 1995 Mustang Gt cranks but won't start!

Hey everyone,

I was stranded at work with my 95 GT yesterday. The car cranks strong, fuel pump (walbro 255) can be heard priming, so I'm guessing this has something to do with not getting spark? Is it common for distributors and ignition coils to go bad on these?

Thanks
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Unread 06-19-2010   #2 (permalink)
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Quote:
Originally Posted by FivePOINTOoo View Post
Hey everyone,

I was stranded at work with my 95 GT yesterday. The car cranks strong, fuel pump (walbro 255) can be heard priming, so I'm guessing this has something to do with not getting spark? Is it common for distributors and ignition coils to go bad on these?

Thanks
Most common fault is the stator (PIP) on the distributor. Usually gives an intermittent issue for a few weeks before failing completely. Coil and TFI modules are not usually a problem. However, before pulling the distributor I would check the coil .
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Unread 06-19-2010   #3 (permalink)
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Okay things are getting weird now. Replaced the distributor cap, rotor, and ignition coil. I'm getting spark so it shouldnt be the stator right?

Now for the weird part. It fires up in the morning but in the afternoon when its 105 degrees outside it wont start, just cranks. Help?
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Unread 06-20-2010   #4 (permalink)
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Quote:
Originally Posted by FivePOINTOoo View Post
Okay things are getting weird now. Replaced the distributor cap, rotor, and ignition coil. I'm getting spark so it shouldnt be the stator right?

Now for the weird part. It fires up in the morning but in the afternoon when its 105 degrees outside it wont start, just cranks. Help?
Do you still get spark when it won't start in the afternoon or just in the morning or on a cold start? I don't believe you can get a spark with a bad stator. The stator/PIP (profile ignition pickup) is letting the PCM to switch the coil on and off and the ignition control module (TFI). Not common on the sn95's but it's sounding like the ignition module. Have you pulled any stored trouble codes? Might be helpful at this point.
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Unread 06-20-2010   #5 (permalink)
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The car is definitely sparking at all parts of the day. It's also not throwing out any codes at all. I have read up on some forums that said that the ignition module has heat issues..So maybe I'll go pick one up right now and see if that solves my problem. I'll keep you posted

Also as I expected the car fired up first thing this morning after sitting all night. So I'm 100% sure this is heat related. (Middle of the day temps here in AZ are about 105)

Thanks again and I'll let you know what happends after I replace the module.
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Unread 06-20-2010   #6 (permalink)
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Well, before you start throwing money at it, you should compare the price of the PIP to the ignition module.

The ignition module is about $60, while the PIP is less than $30.

Of course, the ignition module is likely easier to replace as it does not involve pulling the distributor out and tearing it apart. But, the PIP is a much more common failure on these cars IMHO.

PIP failures are certainly heat related as well. The single most common example of a failing PIP is that the car is started, it is driven until it reaches temperature, and then the car dies and will not start. Later, after the passage of some time, the car magically starts. Not because anything fixed itself, but because everything cooled down.

So, while it may in fact be the ignition module, I have never actually heard of someone replacing that part and having their no start issues fixed. Usually, replacing it is followed by something along the lines of "this damn car, I have spent all of this money on parts, and it is still messing up!!!!"

How-To: Rebuild Your Distributor and Replace the Stator
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Unread 06-20-2010   #7 (permalink)
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Quote:
Originally Posted by FivePOINTOoo View Post
The car is definitely sparking at all parts of the day. It's also not throwing out any codes at all. I have read up on some forums that said that the ignition module has heat issues..So maybe I'll go pick one up right now and see if that solves my problem. I'll keep you posted
The ignition module issue was primarily related to the 93 and earlier models where the TFI module was mounted on the distributor. Ford relocated the TFI module to the passenger side fender behind the air intake tube. I would choose the PIP before the TFI as well.
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Unread 06-21-2010   #8 (permalink)
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Thanks fellas,

I ended up replacing the ignition module before I read your posts about the PIP but it looks like the module was it. Fired right up all day long no problem! I even drove it around a bunch to get it to operating temp and it still fired up. Thanks for all your help!
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Unread 06-21-2010   #9 (permalink)
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Quote:
Originally Posted by FivePOINTOoo View Post
Thanks fellas,

I ended up replacing the ignition module before I read your posts about the PIP but it looks like the module was it. Fired right up all day long no problem! I even drove it around a bunch to get it to operating temp and it still fired up. Thanks for all your help!
Maybe, but I suspect you will be posting again shortly saying it "died again today". Did you liberally apply the dielectric grease to the back side of the module? IIRC that is important.
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Unread 06-21-2010   #10 (permalink)
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Funny you should ask..I put the module in and then I saw the grease at the bottom of the box so I took it out and put it on. So yes, the entire metal surface is covered in grease.
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