Car won't start after motor swap.....help

tireburner163 · 02-18-2006, 02:01 AM

A buddy and me tried to fire off the coupe tonight and ran into a little snag.

When the key is turned to the "run" position the pump will not prime at all. However when the key is turned to the "start" position the pump will prime and the car will start. However as soon as you release the key the car dies. It's like the "start" and "run" positions are mixed up.

I'm a little foggy on the subject, but from what I understand the ECU will look for a ignition signal from the TFI module and if it doesn't "see" a signal it turns the pump off.

I'm pretty sure it is something to do with this system, because we jumped the relay and had the pump running constantly and as soon as you released the key from the "start" position it would die instantly.

I did take the whole engine harness out of the car while the motor was out and hid it all. So maybe I didn't hook something up right, but I'm pretty sure I've got everything hooked back up right.

The ECU relay is working and it is a brand new distributor and TFI module.

Any clue what could be wrong? ECU fried?..It did bang round in the back seat of my daily driver for a couple of months. Ignition switch FUBAR'ed?

ANY ideas?????

fiveohpatrol · 02-18-2006, 03:06 PM

it's a ground

Joel5.0 · 02-18-2006, 04:12 PM

Ignition switch or wiring combination of the ign on position at the switch. Grounds definetely need to be rechecked.. I would start by checking 12vdc ign on at some key places (coil, EEC relay, FP relay, ECM pins 37 & 57, injector connector sample) and the always hot 12vdc supply places at EEC relay, FP relay, ECM pin 1. LUK

Jeff Chambers · 02-19-2006, 10:13 AM

There's a wire off the ignition switch, yellow w/ black if I remember correctly that must see 12-volts during cranking only. Check this.

02-18-2006, 02:01 AM	#1
tireburner163 It's a lot like a race car Join Date: Aug 2000 Location: Meridian, MS Posts: 4,130	Car won't start after motor swap.....help A buddy and me tried to fire off the coupe tonight and ran into a little snag. When the key is turned to the "run" position the pump will not prime at all. However when the key is turned to the "start" position the pump will prime and the car will start. However as soon as you release the key the car dies. It's like the "start" and "run" positions are mixed up. I'm a little foggy on the subject, but from what I understand the ECU will look for a ignition signal from the TFI module and if it doesn't "see" a signal it turns the pump off. I'm pretty sure it is something to do with this system, because we jumped the relay and had the pump running constantly and as soon as you released the key from the "start" position it would die instantly. I did take the whole engine harness out of the car while the motor was out and hid it all. So maybe I didn't hook something up right, but I'm pretty sure I've got everything hooked back up right. The ECU relay is working and it is a brand new distributor and TFI module. Any clue what could be wrong? ECU fried?..It did bang round in the back seat of my daily driver for a couple of months. Ignition switch FUBAR'ed? ANY ideas????? __________________ 1987 Buick T-type 1998 HD Electra Elide

02-18-2006, 03:06 PM	#2
fiveohpatrol I'd rather be basketweaving Join Date: Feb 2000 Location: Indianapolis Posts: 2,551	Re: Car won't start after motor swap.....help it's a ground __________________ NMRA O/C 9516 NA pumpgas stickshift 347 10.65@125.6, 6.73@100, 1.41 60ft

02-18-2006, 04:12 PM	#3
Joel5.0 Registered Member Join Date: Oct 2005 Location: Sabana Grande, Puerto Rico Posts: 33	Re: Car won't start after motor swap.....help Ignition switch or wiring combination of the ign on position at the switch. Grounds definetely need to be rechecked.. I would start by checking 12vdc ign on at some key places (coil, EEC relay, FP relay, ECM pins 37 & 57, injector connector sample) and the always hot 12vdc supply places at EEC relay, FP relay, ECM pin 1. LUK __________________ ACRONYMS: LUK=Let Us Know, GL=Good Luck, LMK=Let Me Know, JIC=Just In Case, BTSTDTRT=Been There Seen That Done That Repaired That and the classic... DILLIGAS=Do I Look Like I Give A S*** 1986 Mustang GT w/T-Tops NOW: 5.0L Stock SB, X303 Cam, 700 cfm DP Holley, 289 '66 Heads, 1.7 RR, Richmond Gear 4+1 Tranny, Centerforce DF, 2.73 Gears WIP: 3.90 Gears, LS Overhaul, Adj. LCA's & UCA's (Granatelli), T-Top weather striping and rear braces bodywork

02-19-2006, 10:13 AM	#4
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	Re: Car won't start after motor swap.....help There's a wire off the ignition switch, yellow w/ black if I remember correctly that must see 12-volts during cranking only. Check this. __________________ Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!"

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