car cranks, but no fuel or spark

mustangtw5901 · 04-28-2008, 05:58 PM

Hi, I just bought a 1987 supra turbo 5spd and it dosent run. I am working on it, trying to diagnose the problem, but am having some difficulties. What I know is that the engine is not getting fuel or spark. When I turn the ignition on I do not hear the fuel pump run and the check engine light does not illuminate. The engine will crank over. I have checked all the fuses/relays and they all are ok. When I try to jump the fuel pump at the diagnostic port (b+ and fp), the fuel pump does not turn on. I have no power at b+ in the diagnostic port. When I run a jumper from the positive battery terminal to the fp port in the diagnostic box the fuel pump works. At the ecu I have power at the batt terminal and e1, but no power between e1 and +B, e1 and +B1, and e1 and IG SW. I have no power also when going to body ground instead of e1. So does anyone have a clue what problem this might be? I am thinking either ECU or ignition switch? Do these go bad often? Thanks for any help.

cre · 04-28-2008, 06:22 PM

Double check the main EFI relay and test the ignition switch via the harness connection underneath the switch beside the steering column. B+ would still have power if the ECU were dead.

mustangtw5901 · 04-28-2008, 06:42 PM

Do you have link to, or can you tell me the proceadure for testing the ignition switch? I cant seem to find it on the online tsrm for the 87. Thanks.

cre · 04-28-2008, 06:52 PM

I'm at work right now so I don't have my '88 TEWD and TSRM with me. You need to find out the wire colors for IG1 (Black/White) and IG2 (Black/Orange) and test those for continuity with the switch turned and with it just in the "ON" position. IG2 is the main suspect. Both should show 12v when tested against ground.

MK3 TEWD On-Line

mustangtw5901 · 04-28-2008, 10:26 PM

Ok, thanks for the help. I think I found and knocked out the main problem of no power to the ecu or B+ in the diagnostic port. It turns out the IGN 7.5 amp fuse in the driver under dash fuse pannel wasent making good enough contact in the socket so I bent the blades a little so now it fits snug. So check engine light is back on and working and now i have power at B+ and at the ig sw at the ecu. I also have 10.8vs at the fuel pump while cranking, so I guess that means I have fuel going to the motor. My problem now is that I still have no spark.

supramacist · 04-28-2008, 10:33 PM

Meter the ignitor.

04-28-2008, 05:58 PM	#1
mustangtw5901 Stock Join Date: Apr 2008 Location: florida Posts: 16	car cranks, but no fuel or spark Hi, I just bought a 1987 supra turbo 5spd and it dosent run. I am working on it, trying to diagnose the problem, but am having some difficulties. What I know is that the engine is not getting fuel or spark. When I turn the ignition on I do not hear the fuel pump run and the check engine light does not illuminate. The engine will crank over. I have checked all the fuses/relays and they all are ok. When I try to jump the fuel pump at the diagnostic port (b+ and fp), the fuel pump does not turn on. I have no power at b+ in the diagnostic port. When I run a jumper from the positive battery terminal to the fp port in the diagnostic box the fuel pump works. At the ecu I have power at the batt terminal and e1, but no power between e1 and +B, e1 and +B1, and e1 and IG SW. I have no power also when going to body ground instead of e1. So does anyone have a clue what problem this might be? I am thinking either ECU or ignition switch? Do these go bad often? Thanks for any help. Last edited by mustangtw5901; 04-28-2008 at 06:01 PM.

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04-28-2008, 06:22 PM	#2
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Double check the main EFI relay and test the ignition switch via the harness connection underneath the switch beside the steering column. B+ would still have power if the ECU were dead.

04-28-2008, 06:42 PM	#3
mustangtw5901 Stock Join Date: Apr 2008 Location: florida Posts: 16	Do you have link to, or can you tell me the proceadure for testing the ignition switch? I cant seem to find it on the online tsrm for the 87. Thanks.

04-28-2008, 06:52 PM	#4
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	I'm at work right now so I don't have my '88 TEWD and TSRM with me. You need to find out the wire colors for IG1 (Black/White) and IG2 (Black/Orange) and test those for continuity with the switch turned and with it just in the "ON" position. IG2 is the main suspect. Both should show 12v when tested against ground. MK3 TEWD On-Line

04-28-2008, 10:26 PM	#5
mustangtw5901 Stock Join Date: Apr 2008 Location: florida Posts: 16	Ok, thanks for the help. I think I found and knocked out the main problem of no power to the ecu or B+ in the diagnostic port. It turns out the IGN 7.5 amp fuse in the driver under dash fuse pannel wasent making good enough contact in the socket so I bent the blades a little so now it fits snug. So check engine light is back on and working and now i have power at B+ and at the ig sw at the ecu. I also have 10.8vs at the fuel pump while cranking, so I guess that means I have fuel going to the motor. My problem now is that I still have no spark.

04-28-2008, 10:33 PM	#6
supramacist 1000whp postwhore Join Date: Apr 2007 Location: Escape from the Prison Planet Posts: 1,356	Meter the ignitor.