wiring problem with 4 to 8 cyl conversion

87PonyBoyGT

New Member

Sep 5, 2003

24

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north jersey

Nov 18, 2006

#1

• Nov 18, 2006

• #1

well i guess my first mistake was doing the conversion lol any way the motor is from a 91 mustang and the body is a 89 4 cyl. so the installation was going good mechanically till i went to go start her up all i got was cranking. so i went to check for fuel and the lines were dry. so i go to the fuel pump relay and my problems began . im getting 5 volts from the ground side signal and 1 volt from the ignitions signal side. so i jus jump the relay to get fuel pressure and still crank with no start. so i go to the eec power relay and i have the the same problem as the fuel pump relay, there 5 volts just sitting there on the signal wire so i go checking everything else and i have 5 volts sitting at the injectors. i have no idea whats going on any body with any input or wiring diagrams would be plenty helpful

 

bullitstang1313

Member

Jan 21, 2003

713

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Indianapolis / Columbus, Indiana

Nov 18, 2006

#2

• Nov 18, 2006

• #2

There are some really helful sites out there. Check out www.fordfuelinjection.com There are a lot of useful threads on here to. Jrichter has a really good cranks, but won't start thread.

 

old_blue

15 Year Member

Nov 3, 2003

1,783

282

124

Nov 18, 2006

#3

• Nov 18, 2006

• #3

is the computer out of the 91??? all the wiring for the motor out of the 91??? maf i assume??

 

tbovee

Member

May 22, 2006

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Fredericksburg Va

Nov 18, 2006

#4

• Nov 18, 2006

• #4

try here...
http://www.autozone.com/servlet/UiB..._us/0900823d/80/19/59/5a/0900823d8019595a.jsp

 

87PonyBoyGT

New Member

Sep 5, 2003

24

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north jersey

Nov 19, 2006

#5

• Nov 19, 2006

• #5

old_blue said:

is the computer out of the 91??? all the wiring for the motor out of the 91??? maf i assume??

Click to expand...

yea all the wiring and the comp is out of the 91. another thing is i have 2 unplugged connectors that im not sure of. one from the motor harness( a cicular connector next to a green one) and another similar circlar connector near the booster come from the cars harness/ fuse block. im not sure what they are for but they are there unconected.

 

TC93

Well-Known Member

Sep 11, 2000

2,075

1

57

Ellerslie GA 31807

Nov 19, 2006

#6

• Nov 19, 2006

• #6

If you used the 91 engine hanress with the 89 dash hanress that is you problem. The 91 engine harness has one plug( redish brown looking) by the booster, and the 89 dash hanress will have two(blk & gry). You can do some re-wiring with the hanresses, or swap an 89 engine harness.

 

87PonyBoyGT

New Member

Sep 5, 2003

24

0

0

north jersey

Nov 19, 2006

#7

• Nov 19, 2006

• #7

thanx myke i was going crazy looking at wiring diagrams trying to figure out the problem and chasing wires all over. ill pick up a wiring harness and let you guys know how i made out.

 

TC93

Well-Known Member

Sep 11, 2000

2,075

1

57

Ellerslie GA 31807

Nov 19, 2006

#8

• Nov 19, 2006

• #8

Or you can swap an 87 or 88 engine hanress and use the maf conversion pig tail kit, if you can't find and 89 engine hanress.