No Injector Pulse

AutoPirate · 11-07-2010, 10:52 PM

88 7mge. Built motor, bored out, ported, etc. Toss it in and no injector pulse.
I own a repair/performance shop so I have plenty of resources at hand. Here's the details:
Has spark
Has compression
Electronic fuel control system good(Main relay, circuit opening relay, solenoid resistor, cold start injector, temp sensor, pump relay and resistor, AFM, TPS, all are good).
No pulse from ECU, no fuel pump prime or run (jumped b+ to fp, pump is good).
Engine runs when ether pumped into intake(ran this way for 45 minutes to check all other systems, everything good)
Harness is fine, all circuits verified.
Thoughts?

AutoPirate · 11-08-2010, 04:37 PM

wow, looks like I might be on my own

Ranma · 11-08-2010, 08:55 PM

Probably a broken wire someplace.

89ST · 11-08-2010, 09:07 PM

I would think that the circuit in the ecu that sends the pulse to the injectors has had its day.

CHUCKABOON · 11-09-2010, 12:00 AM

First thing I look for is check eng light operation. My rule is No check eng. lite NO START. Could you have left the ground lug off ? (Bolts to intake)
Let me know,I'll help you...I've got the factory manual.
(I do this stuff for a living too, since '67)

Chuckaboon

zby67 · 11-09-2010, 04:12 AM

Quote:

Originally Posted by CHUCKABOON

First thing I look for is check eng light operation. My rule is No check eng. lite NO START. Could you have left the ground lug off ? (Bolts to intake)
Let me know,I'll help you...I've got the factory manual.
(I do this stuff for a living too, since '67)

Chuckaboon

ware did you get a factory manual?

11-07-2010, 10:52 PM	#1
AutoPirate Stock Join Date: Nov 2010 Location: NKY Posts: 2	No Injector Pulse 88 7mge. Built motor, bored out, ported, etc. Toss it in and no injector pulse. I own a repair/performance shop so I have plenty of resources at hand. Here's the details: Has spark Has compression Electronic fuel control system good(Main relay, circuit opening relay, solenoid resistor, cold start injector, temp sensor, pump relay and resistor, AFM, TPS, all are good). No pulse from ECU, no fuel pump prime or run (jumped b+ to fp, pump is good). Engine runs when ether pumped into intake(ran this way for 45 minutes to check all other systems, everything good) Harness is fine, all circuits verified. Thoughts?

11-08-2010, 08:55 PM	#3
Ranma 12psi boost Join Date: Jun 2010 Location: Claremore, OK Posts: 326 Blog Entries: 10	Probably a broken wire someplace. __________________ 1986 Mk III MA70 7MGE Targa Top 5 Speed Stock Exhaust

11-09-2010, 12:00 AM	#5
CHUCKABOON Stock Join Date: Nov 2009 Location: Silver Springs Fla. Posts: 5	No pulse First thing I look for is check eng light operation. My rule is No check eng. lite NO START. Could you have left the ground lug off ? (Bolts to intake) Let me know,I'll help you...I've got the factory manual. (I do this stuff for a living too, since '67) Chuckaboon

11-08-2010, 04:37 PM	#2
AutoPirate Stock Join Date: Nov 2010 Location: NKY Posts: 2	wow, looks like I might be on my own

11-08-2010, 09:07 PM	#4
89ST Intake Join Date: Sep 2010 Location: Hamilton Ontario Posts: 40	I would think that the circuit in the ecu that sends the pulse to the injectors has had its day.