F350 no spark issues
Thread Starter
|
New User
Joined: Jul 2012
Posts: 3
Likes: 0
F350 no spark issues
Hey guys,
So, here's my problem. I have a 1996 ford f350 5.8 liter that doesn't have any spark, but is getting fuel injection. I've checked the ICM, replaced the coil, and distributor cap. I'm getting proper voltage, good ground to ICM, and I was getting a signal from the PIP sensor. The pip signal started off week and then slowly got stronger while cranking though. So, I read that if you disconnect the computer you should get spark if the PIP sensor is bad. I did this and I got one single spark every time I started cranking, but never again after that. Any ideas? I also wanted to try disconnecting the SPOUT sensor, but I have no idea what this is and where it is. The truck also seemed to have a bad ground before the no spark issue occurred. The truck was running really rich before this and showed a bunch of codes for high voltage on a lot of the sensors, but I think this a completely separate issue. I'd appreciate any suggestions thanks.
So, here's my problem. I have a 1996 ford f350 5.8 liter that doesn't have any spark, but is getting fuel injection. I've checked the ICM, replaced the coil, and distributor cap. I'm getting proper voltage, good ground to ICM, and I was getting a signal from the PIP sensor. The pip signal started off week and then slowly got stronger while cranking though. So, I read that if you disconnect the computer you should get spark if the PIP sensor is bad. I did this and I got one single spark every time I started cranking, but never again after that. Any ideas? I also wanted to try disconnecting the SPOUT sensor, but I have no idea what this is and where it is. The truck also seemed to have a bad ground before the no spark issue occurred. The truck was running really rich before this and showed a bunch of codes for high voltage on a lot of the sensors, but I think this a completely separate issue. I'd appreciate any suggestions thanks.
Fleet Owner
Joined: Oct 2005
Posts: 20,786
Likes: 1,751
From: Kentucky
Hey guys,
So, here's my problem. I have a 1996 ford f350 5.8 liter that doesn't have any spark, but is getting fuel injection. I've checked the ICM, replaced the coil, and distributor cap. I'm getting proper voltage, good ground to ICM, and I was getting a signal from the PIP sensor. The pip signal started off week and then slowly got stronger while cranking though. So, I read that if you disconnect the computer you should get spark if the PIP sensor is bad. I did this and I got one single spark every time I started cranking, but never again after that. Any ideas? I also wanted to try disconnecting the SPOUT sensor, but I have no idea what this is and where it is. The truck also seemed to have a bad ground before the no spark issue occurred. The truck was running really rich before this and showed a bunch of codes for high voltage on a lot of the sensors, but I think this a completely separate issue. I'd appreciate any suggestions thanks.
So, here's my problem. I have a 1996 ford f350 5.8 liter that doesn't have any spark, but is getting fuel injection. I've checked the ICM, replaced the coil, and distributor cap. I'm getting proper voltage, good ground to ICM, and I was getting a signal from the PIP sensor. The pip signal started off week and then slowly got stronger while cranking though. So, I read that if you disconnect the computer you should get spark if the PIP sensor is bad. I did this and I got one single spark every time I started cranking, but never again after that. Any ideas? I also wanted to try disconnecting the SPOUT sensor, but I have no idea what this is and where it is. The truck also seemed to have a bad ground before the no spark issue occurred. The truck was running really rich before this and showed a bunch of codes for high voltage on a lot of the sensors, but I think this a completely separate issue. I'd appreciate any suggestions thanks.
You stated you have "fuel injection", I interpret that to mean you are getting injector pulses? A bad ground can wreak all kinds of havoc. What did you do to resolve the original ground issue?
When troubleshooting ignition problems I like to refer to these articles:
Ford Ignition Module Test. Fender Mounted Module (ICM).
SBFTech.com TFI Module/Hall Sensor Testing Procedure
As far as the SPOUT plug goes it is a small gray plug located near the Ignition Control Module:
courtesy oldfuleinjection.com
Thread Starter
|
New User
Joined: Jul 2012
Posts: 3
Likes: 0
I never could find the bad ground, but I'm not sure I checked and cleaned all of them. Does anyone have list of where all the grounds for the engine wiring hanress are? Expecially the ground for the map, tps, and egr sensors, which came up in the original codes from the engine.
Fleet Owner
Joined: Oct 2005
Posts: 20,786
Likes: 1,751
From: Kentucky
All of those sensors are referenced to Signal-Return, Pin 46 of the PCM (Engine Computer). The PCM is grounded through the body ground G101, located next to the battery and starter relay. The other ground that many overlook is G100 located near the driver side headlight on the radiator support.
Thread Starter
|
New User
Joined: Jul 2012
Posts: 3
Likes: 0
Ok, grounds were all cleaned. So, I got spark back after disconnecting the spout signal. I also checked the spout signal, ac voltage, while cranking and I didn't get anything, which means a bad pcu. Correct? So, I should be able to get the truck to run by disconnecting the spout connection, but now it doesn't seem to be injecting properly. I checked injection a few days ago and I was getting 3 volts constant voltage to the injectors that seems kind of low to me.
Fleet Owner
Joined: Oct 2005
Posts: 20,786
Likes: 1,751
From: Kentucky
Ok, grounds were all cleaned. So, I got spark back after disconnecting the spout signal. I also checked the spout signal, ac voltage, while cranking and I didn't get anything, which means a bad pcu. Correct? So, I should be able to get the truck to run by disconnecting the spout connection, but now it doesn't seem to be injecting properly. I checked injection a few days ago and I was getting 3 volts constant voltage to the injectors that seems kind of low to me.
If you have only 3 volts on the supply side of the injectors you have a completely separate issue. You should have battery voltage (+12 VDC nominal) on the supply side. It's the PIP signal that triggers the PCM to ground the other side of the injectors. This will cause the injector(s) to open to allow fuel flow.
Some handy diagrams to reference:
Basic Ignition
Basic Injector diagram:
EEC relay and Fuel Pump, relay (listed for a 5.8L engine but very similar to your 7.5L)
Thread
Thread Starter
Forum
Replies
Last Post
brandonf150
1987 - 1996 F150 & Larger F-Series Trucks
9
Sep 26, 2016 07:18 PM
exidor12
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
5
Sep 13, 2015 06:34 AM
