86 4runner not starting
 

22 RE non turbo I put a new AFM in yesterday. The 4runner ran rough but otherwise ok. Felt like it wasn't firing correctly. This morning we went to start it and nothing. The starter goes, all the relays click, the fuel pump hums but nothing fires. We dove into the FSM and we ran a bunch of test. We found out the the fuel injectors (including the aux) aren't getting any voltage (light bulb test). So we backtracked to all the connections using the diagrams in the FSM. We verified that the solenoid resistors are receiving and putting out current, that their resistance is within the proper range. Also checked the 30 AMP fuse in the box on the passenger side. We checked the EFI main, the EFI fuse, Main Relay, and the connections going into the ECU (E0, E1, 10, 20). I also checked the grounds from the ECU. In addition we checked the battery, spark from the distributor, and most of the sensors under the hood (cold start injector, temp, some others). No engine error codes either. We checked the starter relay for good measure and checked the ignition on the ECU. We get the same behavior with out without the fuel pump jumper. I doubled check the AFM as well (static, dynamic tests and ground to body). We also tried spraying a little ether into the throttle body but nothing happened. So I am at a loss about what else to check. But the fuel injectors not getting any current is a new (maybe) problem for the runner. Thanks for any advice or guidance! ara

There is an EFI and ignition fuse in the fuse box behind the driver side kick panel. Check both of these fuses to make sure there not corroded and that there good. I had this same problem on my 86 4Runner because these fuses were corroded and lost contact.
I cleaned the contacts in the fuse box as best as I could and that fixed the problem.

ok the injectors are fired by ecm via ground signal. Two lines that merge. So your ? should be what tells the injectors when to fire. You should prob check your distributor circuits and coil resistance. Let us know what you find.

Also when checking to see if its getting voltage use a test light also. A multimeter can tell you that you have 12volts until you apply a load. Which can indicate a corroded wire causing resistance to go up in that circuit

try that
 

I hope that helps you if not tell us more

@myyota I'll recheck the fuses tomorrow.

@my75 I hadn't thought about the dist circuit or the coil. Will check those tomorrow. So which coil are you referring to?

Thanks

coil
 

pick up coil it is what triggers the ecm to fire

Silly question. Is the pickup coil the same as the ignition coil and where are the distributor circuits located. I am digging through the FSM right now trying to find these things.

Oops so pickup coil is off the distributor also called signal generator. Found that one.

Yes it goes from distributor to the igniter on top of igntion coil. Then from there to the ecm.

Cool. Thanks. Heading to check in a few minutes.

Alright. The pickup coil is at 152 Ohms so that's fine. The primary coil on the ignition coil is 1.6 Ohms, so double what it should be. The secondary coil is 13.4 kOhms. Also high. Replace this?+

I replaced the ignition coil this morning and same thing. It turns over but doesn't start. At least there is a new coil in now!

Not the ignition coil the pickup coil in the bottom of distributor. Unplug green 2 wire plug and do an ohm check on it then see is wires going from it to ignitor then trace back to ecm. Then trouble shoot that via fsm or repair book under igntion systems

The pickup coil measured in at 152 Ohms. So that's within the range it should be. I'll check the FSM for troubleshooting. Thanks!

Check the solenoid resistor, if thats bad your truck wont start. I had this part go bad on my 86 4Runner and it wouldn`t start.

Ok, here are some results

Solenoid resistor 2.2 Ohms
Spark test on high tension from ignition coil - passed, sparked
Ignition coil resistance check - also good
Pickup coil - 152 Ohms - also within range
Air Gap on distributor a little large but not to bad

ECU readings
+B-E1 13.16
BATT-E1 13.37
#10-E01 13.8
#20-E02 13.9

The spark plugs are firing (light bulb test), the engine turns over with no problems, no engine error codes

Checked the EFI, engine, and ignition fuses. All good there.

Doubled check the relays: EFI main, Open Circuit, and one other I can't remember.

Using the light bulb test on the fuel injectors shows us that no current is getting to the fuel injectors.

This is pretty puzzling to me (but this is also my first vehicle I've worked on).


ara

Do you have positive power to the injectors at all times with key on

@ my 75 toyota
Not sure. When I plug a lightbulb into the injectors and try to start no light comes on.

I'll plug the bulb back in tomorrow and just flip the key on without trying to start it.

I sent you a private pm opps forgot my email amd4me@suddenlink.net