88 harness in 89

khriz_mk3 · 01-20-2014, 02:33 AM

Its a JDM engine. I've had multiple mechanic's tell me its the wire harness. That is there is no pulse in the injectors. They say the harness it has now has been cut too much and has too many plugs missing.

btwilson86 · 01-20-2014, 04:59 PM

No pulse to injectors could be a faulty (or missing) injector resistor pack. Make sure that the metal box next to the drivers side strut tower is plugged in to the wiring harness.

Have you pulled your engine codes yet? Even if the lights off, codes may be stored in the computer that could help diagnose the problem. I personally think a bad harness is a long shot, especially since the car will temporarily run

khriz_mk3 · 01-20-2014, 06:26 PM

That's the small grey box right? It starts up if you inject starter fluid in it. However as soon as you stop the car stops. The mechanic said it was the harness that was missing a lot of sensor plugs which is why the injectors don't work.

btwilson86 · 01-20-2014, 07:11 PM

Yeah, it should be a small gray metal box with a round yellow connector. There's a similar box on the passenger side fender- that's the fuel pump relay. Your engine harness may have gray plugs that connect to those.

If you put a jumper wire between the B+ and FP terminals in the diagnostic box (by the fuse box behind the battery) and turn the key on, do you hear fuel running through the fuel rail?

When you say its missing sensor connectors, are they still connected some way to the sensors or are the wires not connected at all?

Do you have a JDM harness on your engine or a US harness?

What ECU are you using?

01-20-2014, 04:59 PM	#2
btwilson86 Super Moderator Join Date: May 2007 Location: Billings, Montana Posts: 1,034	No pulse to injectors could be a faulty (or missing) injector resistor pack. Make sure that the metal box next to the drivers side strut tower is plugged in to the wiring harness. Have you pulled your engine codes yet? Even if the lights off, codes may be stored in the computer that could help diagnose the problem. I personally think a bad harness is a long shot, especially since the car will temporarily run __________________ 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

01-20-2014, 07:11 PM	#4
btwilson86 Super Moderator Join Date: May 2007 Location: Billings, Montana Posts: 1,034	Yeah, it should be a small gray metal box with a round yellow connector. There's a similar box on the passenger side fender- that's the fuel pump relay. Your engine harness may have gray plugs that connect to those. If you put a jumper wire between the B+ and FP terminals in the diagnostic box (by the fuse box behind the battery) and turn the key on, do you hear fuel running through the fuel rail? When you say its missing sensor connectors, are they still connected some way to the sensors or are the wires not connected at all? Do you have a JDM harness on your engine or a US harness? What ECU are you using? __________________ 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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01-20-2014, 02:33 AM	#1
khriz_mk3 Stock Join Date: Dec 2013 Location: california Posts: 5	Its a JDM engine. I've had multiple mechanic's tell me its the wire harness. That is there is no pulse in the injectors. They say the harness it has now has been cut too much and has too many plugs missing.

01-20-2014, 06:26 PM	#3
khriz_mk3 Stock Join Date: Dec 2013 Location: california Posts: 5	That's the small grey box right? It starts up if you inject starter fluid in it. However as soon as you stop the car stops. The mechanic said it was the harness that was missing a lot of sensor plugs which is why the injectors don't work.