Question about 1991 Ford F350

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Only one bank of injectors work

I have a 1991 f350 with a 5.8 ltr. efi,only one bank of injectors are energizing. Checked all wiring all ok.Replaced TPS still will not start.Anybody got ideas.

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Replace the ECM

Posted on Nov 20, 2009

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Posted on Jul 31, 2009


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How to get the fuel pump to start working

which engine, Nat.? 2.5L or 4.0L? in the XJ/MJ pickup.
1986 is the first, AMC EFI, used, in Jeeps.
this is the RENIX system (French, EFI injection)
sorry, no ASD then, not until 1991 .with real Chrysler EFI.
the ECU powers the fuel pump relay directly.
if the ECU has power, it will energize this relay, does it?

4.0L here.86-88 (same is true up to 1991)
25921628-jy55te25vvk1g12vmyxwai2y-5-0.jpgthe ASD was introduced on the 1991 Wrangler but only 4L
the XJ/MJ same year but to both engines, 2.5 and 4L
both have ASD in 1991,
The MJ Comanche Pickup is a XJ cut down at the rear. and has same unibody base.
The engine book for XJ/MJ are the same blue book.

Oct 23, 2015 | 1986 Jeep Comanche

1 Answer

No injector pulse 4 cyl 93 f250 460

if you have a $5 test light, you could find the problem. just know that all eight injectors have a constant voltage applied to them anytime the key is in run or start. and also that 4 of the injectors share a common ground, they have their ground wires spliced together before the ground wire enters the pcm to be internally grounded. and the other four injectors are the same- their ground wires splice together. so your four that don't pulse have lost either the power to them, or the common ground wire for the 4 may have broken. or lost connection.

it is easier to check the power side first, so clip a test light lead to the negative battery post or cable, turn the key to on,and probe each injector connector. one of the terminals at all eight injectors will be the power wire, and it should light up the test light. if all eight injectors have power to them, you know it must be a ground side problem. if you find that 4 injectors have no power to them, look for a broken splice in the power wire to all injectors. back in those days, injectors were "bank fired". one side or bank of the engine all had the injector grounds spliced together, so all injectors on one bank fired (pulsed) simultaneously, and then the other bank was fired or pulsed. that was good until sequential injection matched the pulse to the cylinder ready to fire, more precise, and in the modern systems each injector ground has a separate ground inside the pcm. no more splicing of the ground wires, and having bank fired engines.

when the pcm grounds the circuit, the injector coil is energized and the injector opens to spray fuel out. so the injector has constant voltage to it. only when the circuit is grounded is that power applied across the injector.

Jan 22, 2015 | Cars & Trucks

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Need wiring diagram for 99 ford courier

the pulse comes from the computer on the ground side of injector

Sep 01, 2013 | 2004 Mazda B-Series

1 Answer

It started running rough. I changed the cps and the plugs and wires and now it's showing bank 1 is to rich

It could be a fuel delivery problem. If it is fuel injected, or efi, replace the injectors. Simplest solution first. Try some injector cleaner and see if that fixes the problem.

Aug 04, 2013 | Cars & Trucks

1 Answer


Hello....The ECM on your camaro has one (1) injector driver in it. This drive splits to 2 traces inside of the ECM and exits on 2 separate pins.
Each bank of injectors has its own fuse. So a fuse may have popped. Check the wiring harness and check for bad grounds.
To check the injectors measure the resistance across the injector pins. It needs to be above 14 ohms. Best if checked while they are hot.
Good luck, i hope this helps.

Aug 04, 2011 | 1991 Chevrolet Camaro

1 Answer

Car keeps blowing the efi fuse 15 and fuel pump wont run

I surmise you have a shorted fuel injector or injector driver transistor. The engine computer probably knows something is wrong and is not turning on the fuel pump relay as a safety measure. You will need a digital multimeter or a VOM to track down the problem.

Remove the EFI fuse, turn the ignition to ON, but don't start the engine. Measure the voltage between ground and each terminal of the EFI fuseholder. You will make the following tests at the terminal that does NOT have 12 Volts on it (fuse output). Turn off the ignition and disconnect the battery.

Measure the resistance from the fuse output terminal. It will probably be much less than 1 Ohm. The next thing is to check the fuel injectors. Disconnect the injectors one at a time and check the resistance . If the resistance suddenly increases substantially more on one injector than it does when the others are unplugged, you've found the culprit. Now you need to check the injector driver transistor. One of the wires to the injector is 12 V from the fuse output and the other goes to the transistor. Check the resistance to ground. If it is 0 or close to it, the transistor is fried, and the EFI module (or engine computer if it is contained there) will need to be repaired or replaced. Also, compare the resistance of the suspect injector with the others. If it is substantially less, the injector coil is bad (a failure in one part can ruin the other, so check both).

Nov 18, 2010 | 1991 Toyota Celica

1 Answer

1991 Honda Prelude,2.1 litre, EFI, bogs down when trying to accelerate from low rpms. Have changed plugs, wires, fuel filter, checked timing. The car acts like it has turbo lag, but it does not have a...

hi..this is beacuse of sluggish working of the linkages which should increase the gas flow through the injector when you accelarate. due to the sluggish operation its takes time to increase the amount of gas going to injector. so please check the linkages and tighten it accordingly.

please rate me weather the information which i provided was usefukll to you by clicking on the thumbs present on the end of your page.thank you

Jul 09, 2010 | 1991 Honda Prelude

1 Answer


The problem is almost certasinly that dried gas residue has plugged the injector spray tip, most likely they are ruined and will need to be replaced, the only way to determine this 100% is to have a dealer run a injector flow test, they may be able to power clean them, here is the price of the replacements.

ACDELCO Part # 217296 moreinfo.gif {#17112982}
INJECTOR KIT,SEQ M/PORT FUEL REQUIRES O-RING P/N 217-1379 217-296.jpg $95.79

Apr 14, 2009 | 1991 Cadillac DeVille

1 Answer

Keeps blowing 15a efi fuse 1991 toyota pickup 2.2 re

there's a short somewhere causing that amperage to go up

Dec 12, 2008 | 2004 Toyota Corolla

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