fuel injectors

salomon68 · 01-23-2008, 12:14 AM

i have put in a rebuilt engine into my 87 supra and it won't start up. one fuel injector is reading too much resistance and another one is leaking. they are the original injectors. i was thinking about just replacing all of them. any suggestions?

Pretaco · 01-23-2008, 04:24 PM

Does it even try to start, sputter or anything.
Usually if one or two injectors are bad, the engine will still start, just run crappy. Check for fuel pressure, spark, timing, compression, and if all that is good then look at the injectors.

salomon68 · 01-23-2008, 06:15 PM

i tried starter-fluid at one point and had a fireball come out of the intake, so i am getting spark. also, i have new spark plugs, wires, rotor, and distributor cap on it. i've installed a new Walbro fuel pump and it is working. when i tried starting the car after installing the fuel pump, i heard a faint pop. kinda like pressure being quickly released. that's when i found that the #2 injector was leaking fuel (bad o-ring). the engine is a professionally rebuilt 7M-GE. the engine came already timed with a timing belt on it and it has a 3 year warranty. i'm assuming the compression and timing are fine.

Pretaco · 01-23-2008, 08:22 PM

Have you tested ignition timing yet? If the injectors are bad, starter fluid should have started the car for at least a couple of seconds. If it backfires out of the intake, its usually caused by bad ignition timing, i.e. the distributor isn't installed correctly, or the firing order is wrong.
A timing light will work even if the engine won't run.

salomon68 · 01-23-2008, 09:40 PM

i did forget to mention the starter fluid did make it run for just a couple of seconds.

Pretaco · 01-23-2008, 10:17 PM

Is the ecu grounded?
The two white around black wires and the brown one next to them? And the case too. You may have a problem like mine was, when I grounded the case of my ecu, it started right up.
If you have a stethscope listen to the injectors, they should click.
You can also use a long screwdriver, just put your ear on the handle.
Or get a noid light and hook it up to the injector plug to see if they are getting grounded by the ecu.

01-23-2008, 12:14 AM	#1
salomon68 Stock Join Date: Jan 2008 Location: Knoxville, TN Posts: 10	fuel injectors i have put in a rebuilt engine into my 87 supra and it won't start up. one fuel injector is reading too much resistance and another one is leaking. they are the original injectors. i was thinking about just replacing all of them. any suggestions?

01-23-2008, 08:22 PM	#4
Pretaco 3" Exhaust Join Date: Dec 2007 Location: Glendale, AZ Posts: 126	Have you tested ignition timing yet? If the injectors are bad, starter fluid should have started the car for at least a couple of seconds. If it backfires out of the intake, its usually caused by bad ignition timing, i.e. the distributor isn't installed correctly, or the firing order is wrong. A timing light will work even if the engine won't run. __________________ '88 Supra Targa 5 speed w/ '90 7M-GTE Currently Running Good For Sale: Light blue body parts, Blue interior parts all from '90 supra targa turbo manual. Also for sale: R154 trans, brake pedal, master cylinder, booster, abs actuator, sensors, abs ecu, driveshaft, 3.90 lsd rear end, radiator, wiring, speedo cable, 8 saw blade wheels, '88 ecu, relays, cruise control actuator (bad cable), empty fuel tank, etc....

01-23-2008, 10:17 PM	#6
Pretaco 3" Exhaust Join Date: Dec 2007 Location: Glendale, AZ Posts: 126	Is the ecu grounded? The two white around black wires and the brown one next to them? And the case too. You may have a problem like mine was, when I grounded the case of my ecu, it started right up. If you have a stethscope listen to the injectors, they should click. You can also use a long screwdriver, just put your ear on the handle. Or get a noid light and hook it up to the injector plug to see if they are getting grounded by the ecu. __________________ '88 Supra Targa 5 speed w/ '90 7M-GTE Currently Running Good For Sale: Light blue body parts, Blue interior parts all from '90 supra targa turbo manual. Also for sale: R154 trans, brake pedal, master cylinder, booster, abs actuator, sensors, abs ecu, driveshaft, 3.90 lsd rear end, radiator, wiring, speedo cable, 8 saw blade wheels, '88 ecu, relays, cruise control actuator (bad cable), empty fuel tank, etc....

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Fuel injectors	redneck ricer	MKIII Supra	0	06-15-2007 02:31 AM
Fuel injectors	Biku	Off Topic Forum	7	07-23-2005 04:36 AM

01-23-2008, 04:24 PM	#2
Pretaco 3" Exhaust Join Date: Dec 2007 Location: Glendale, AZ Posts: 126	Does it even try to start, sputter or anything. Usually if one or two injectors are bad, the engine will still start, just run crappy. Check for fuel pressure, spark, timing, compression, and if all that is good then look at the injectors. __________________ '88 Supra Targa 5 speed w/ '90 7M-GTE Currently Running Good For Sale: Light blue body parts, Blue interior parts all from '90 supra targa turbo manual. Also for sale: R154 trans, brake pedal, master cylinder, booster, abs actuator, sensors, abs ecu, driveshaft, 3.90 lsd rear end, radiator, wiring, speedo cable, 8 saw blade wheels, '88 ecu, relays, cruise control actuator (bad cable), empty fuel tank, etc....

01-23-2008, 06:15 PM	#3
salomon68 Stock Join Date: Jan 2008 Location: Knoxville, TN Posts: 10	i tried starter-fluid at one point and had a fireball come out of the intake, so i am getting spark. also, i have new spark plugs, wires, rotor, and distributor cap on it. i've installed a new Walbro fuel pump and it is working. when i tried starting the car after installing the fuel pump, i heard a faint pop. kinda like pressure being quickly released. that's when i found that the #2 injector was leaking fuel (bad o-ring). the engine is a professionally rebuilt 7M-GE. the engine came already timed with a timing belt on it and it has a 3 year warranty. i'm assuming the compression and timing are fine.

01-23-2008, 09:40 PM	#5
salomon68 Stock Join Date: Jan 2008 Location: Knoxville, TN Posts: 10	i did forget to mention the starter fluid did make it run for just a couple of seconds.