Problem with fuel injectors!

teedoff00 · 07-28-2008, 09:51 PM

So I am doing a 1986.5 7mge swap into a 87 Turbo Shell and I got everything all installed and ready to start and the car cranks but will not start.
Things I have checked and/or tried per TSRM:
1. Checked for spark (+)
2. Checked timing (+ everything was aligned properly)
3. Checked fuel pressure in rail (+)
4. Checked spark plug (- plug was dry as a bone!)
5. Checked the fuses (+)
6. Inspected relays but did not test (+ could be problem but were working fine when 7mgte was taken out)
7. Checked for voltage at ecu for the injector wires (+)

What else could be the cause of my injectors not firing? Is it possible that all 6 could be clogged as the car doesn't even sputter? Please help, I need to get this car on the road!
Thanks in advance!

teedoff00 · 07-30-2008, 02:38 AM

Any ideas?
Some more info:
Engine is completely stock 7mge, just replaced belts, hoses, seals, etc. Injectors are stock. All the engine harness connectors are connected. Turbo shell has like three connectors from body harness that are not connected that I think go to the factory boost gauge and pressure sensor. Like I said fuel is in the rail, but the plugs are dry and the injectors aren't firing?
Maybe someone could give me a check list of stuff to check that could cause this? I have followed the TSRM procedure to no avail thus far, obviously I am missing something?????
Thanks guys!

j3pz · 07-30-2008, 03:59 AM

check codes? when you checked for fuel, did you check every plug? do you have fuel to the fuel rail?

btwilson86 · 07-30-2008, 05:03 AM

Power/ground to ECU could be the problem... The injectors are controlled by it. One test you can do (if it's dark out) is to get a 3V LED from Radio Shack or somewhere similar. Pull each injector plug off (one at a time to avoid confusion), and stick the contacts for the LED into the harness plug. Have someone try to start the engine. If the LED flickers (it'll flicker very rapidly if it does), then you're getting power to the injectors and it's not likely an electrical issue. Be sure to do this at night, as the LED will be on/off so quick it doesn't get much of a chance to illuminate.

Trust me, this works. I did the same thing on my 7MGE when I swapped it into my 87 N/A. It wouldn't start due to the distributor being 180 out, but I was checking all the possible reasons for it not to start.

Let us know if this helps, and also be sure to check at the ECU for Power and Ground.

07-28-2008, 09:51 PM	#1
teedoff00 Intake Join Date: Apr 2006 Location: Utah Posts: 34	Problem with fuel injectors! So I am doing a 1986.5 7mge swap into a 87 Turbo Shell and I got everything all installed and ready to start and the car cranks but will not start. Things I have checked and/or tried per TSRM: 1. Checked for spark (+) 2. Checked timing (+ everything was aligned properly) 3. Checked fuel pressure in rail (+) 4. Checked spark plug (- plug was dry as a bone!) 5. Checked the fuses (+) 6. Inspected relays but did not test (+ could be problem but were working fine when 7mgte was taken out) 7. Checked for voltage at ecu for the injector wires (+) What else could be the cause of my injectors not firing? Is it possible that all 6 could be clogged as the car doesn't even sputter? Please help, I need to get this car on the road! Thanks in advance!

07-30-2008, 03:59 AM	#3
j3pz 500whp yet? Join Date: Nov 2005 Location: Mechanicsville, MD, US of A, 20659 Posts: 1,060	check codes? when you checked for fuel, did you check every plug? do you have fuel to the fuel rail? __________________ 88 N/A w/ 5spd - stock - not running, bhg 87 turbo/targa w/ 5spd- fidanza light weight flywheel, new oem slave cylinder, apexi air filter, no ac and no heat

07-30-2008, 05:03 AM	#4
btwilson86 Super Moderator Join Date: May 2007 Location: Billings, Montana Posts: 1,034	Power/ground to ECU could be the problem... The injectors are controlled by it. One test you can do (if it's dark out) is to get a 3V LED from Radio Shack or somewhere similar. Pull each injector plug off (one at a time to avoid confusion), and stick the contacts for the LED into the harness plug. Have someone try to start the engine. If the LED flickers (it'll flicker very rapidly if it does), then you're getting power to the injectors and it's not likely an electrical issue. Be sure to do this at night, as the LED will be on/off so quick it doesn't get much of a chance to illuminate. Trust me, this works. I did the same thing on my 7MGE when I swapped it into my 87 N/A. It wouldn't start due to the distributor being 180 out, but I was checking all the possible reasons for it not to start. Let us know if this helps, and also be sure to check at the ECU for Power and Ground. __________________ 1989 7MGTE R154 Targa Top White Package w/Blue Interior Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels

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07-30-2008, 02:38 AM	#2
teedoff00 Intake Join Date: Apr 2006 Location: Utah Posts: 34	Any ideas? Some more info: Engine is completely stock 7mge, just replaced belts, hoses, seals, etc. Injectors are stock. All the engine harness connectors are connected. Turbo shell has like three connectors from body harness that are not connected that I think go to the factory boost gauge and pressure sensor. Like I said fuel is in the rail, but the plugs are dry and the injectors aren't firing? Maybe someone could give me a check list of stuff to check that could cause this? I have followed the TSRM procedure to no avail thus far, obviously I am missing something????? Thanks guys!