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My 2003 Mach 1 Won't Start
Sorry in advance if this is the wrong category to put this in. I tried the "03/04 Mach Registry" site but it seems dead so I'm back here where I usually ask for help about my 71 mach..
EDIT: I see there is a different subforum for "Other Years" which I somehow rolled right over. Doh!

I have a 2003 Mach with the 4.6L DOHC engine and it won't fire up, it cranks/turns over though.
I went through the usual checklist:

-New battery

-Checked fuel system: Pump works when I put the key in "on" position in ignition. Fuel filter is clean and relay is working properly.
-Replaced spark plugs and checked each one for spark which gives a blue fat spark every time
-Compression test checks out evenly across all cylinders
-Alternator is working normally
-Tried using starter fluid but no results

I haven't physically checked the starter yet since I will have to jack the car up and need to borrow a jack later tonight.
So this makes me think its possibly either the starter or my anti theft system (stock).
I read online that this is probably because the PATS anti theft system took a random crap and isn't allowing the car to actually fire up even though it cranks.
You need to borrow, or buy, an OBD II scan tool. The prices have come way down and decent ones can be bought for $50-$60. Chuck
Cranks turns over = not the starter

Does the '03 have a crank sensor? I had a crank sensor go bad once and it was like someone turned off the ignition.

+1 on the OBD II scan tool. Until Ford installs a Ctrl+Alt+Del button a code reader will be your best friend.


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Yes they have crank sensors I will go get a OBD II scanner tomorrow hopefully its a sensor. My theft light blinks super rapid but turns off when i have they key in the on position. I don't know if that means PATS is broken but only a scanner will tell. thanks for the advice
i don't mean to pull u away from our forum but the folks on this site have a good number of late model of info.
My son's 2002 GT did the same thing
Cranked, theft light flashed rapidly
Everyone said PATS was bad
At one point I decided to swap batteries with my truck.
Started right up - his battery was just weak - car seemed to crank fine, just wouldn't fire ???
I do remember you could smell fuel when cranking.

Is the new battery you got fully charged?
Somehow it was the MAF sensor. I got it to start pretty much by playing rough with the gas pedal but it would stall driving down the street. So I got a obd II scanner read the code and it was MAF sensor failure. I put it in today (super easy) and now it runs and accelerates better than it has in a while.  Chin
[+] 1 user Likes icejawa's post
Excellent. Glad it was an easy fix.


Tachs, Voltmeters, Headlight kits, Wiper delays and more at
[Image: smlogo.jpg]
Rocketman's Classic Cougar (and Mustang) Innovations, LLC
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