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Old 02-19-2010, 07:03 PM   #1
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Angry converted to maf now car wont start!!

so i have an 87 mustang gt. i recently put a f303 cam and a holley systemax intake manifold, i also converted it to maf using a 8ld ecu.....we tapped the fuel pump relay(the one under the driver's seat) into the ignition to get power to thefuel pump. the car fires up but dies. what can cause the
problem?
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Old 02-19-2010, 10:52 PM   #2
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Re: converted to maf now car wont start!!

If you didn't use a maf harness from an 89 that's your problem.
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Old 02-22-2010, 02:29 AM   #3
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Re: converted to maf now car wont start!!

i converted my 87 maf with a 88 mustang 5.0 harness the stang that was a doner was a californian mustang with a computer being a 8LD.So wats the difrence betwen the 88 to 89 harness?i would appreciate any instrucions or steps on how to do the convertion if any one can help me out
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Old 02-22-2010, 07:46 AM   #4
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Re: converted to maf now car wont start!!

The 88 cali car will work with the 87, I was just checking because if you try & use a newer maf set up like a 90-93 on an 87-88 the problems you are having will happen. First off why are you having to jump the fuel pump from the relay under the drivers seat? Is the fuel pump not coming on when you power the car up? Second did you change the map sensor on the firewall with the one from the 88 car. They are different. The non maf cars have a vac line connected to it from the upper intake. It's a pretty straight up swap. Let me go back over it. You will need the computer harness, computer, maf sensor with the bracket, air intake tubes, & map sensor from the 88 donor car. Remove the same parts from the 87 & install the 88 parts in their place. Also use the 88 fuel pump relay under the drivers seat to help with your trouble shooting. Double check your engine & computer harness grounds also.
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Old 02-22-2010, 08:26 PM   #5
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Re: converted to maf now car wont start!!

So I don't have to tap in to the fuel pump rite once I swap the map and fuel pump sensor?
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Old 02-23-2010, 01:19 PM   #6
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Re: converted to maf now car wont start!!

The only reason I told you to swap out the fuel pump relay is because the 87's relay may have been bad. You should'nt have to jump the fuel pump. Double check all of your connections & grounds.The map sensor swap will help the car stay running.
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Old 02-23-2010, 07:42 PM   #7
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Re: converted to maf now car wont start!!

I did what you told me to do on switch the map sensor an the fuel pump relay an the car fired up with no problem thanks for the advice an the car is running good
thanks........
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Old 02-23-2010, 10:23 PM   #8
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Re: converted to maf now car wont start!!

Anytime!!
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Old 02-25-2010, 01:34 PM   #9
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Re: converted to maf now car wont start!!

How is the performance with the Holley intake?
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Old 02-25-2010, 07:52 PM   #10
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Re: converted to maf now car wont start!!

its a good manifold...i can feel the difference like night and day compared t my ported gt40 i had before....thanks again for your help
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