1991 3.0 liter Ranger w/no spark

[kustombrad]

The truck died while driving home. Checked everything and have no spark. Replaced the coil and module, still nothing. Have power to the coil, but nothing anywhere else and now I'm lost. Anybody have a clue what's up? Thanks, Brad

 

[MrE_Powers]

the gear driving the distributor might be broke/stripped i know 3.0s are known for this

 

[adsm08]

check the coil ground.

 

[Bob Ayers]

check the coil ground.

The ICM provides the coil a ground pulse creating a di/dt
for the high voltage.

 

[Ranger44]

the gear driving the distributor might be broke/stripped i know 3.0s are known for this

The later 95' up ones. It's very rare on older 3L's. But is a possibility.


I'd say you'd have to get dirty and diagnose this. Have a Chiltons? A digital multimeter(DMM)? Just follow the steps.

It's hard for anyone to accurately diagnose this over a keyboard without the help from the owner doing tests and posting results, UNLESS it's an ultra-common problem with tell-tale symptoms.

Ryan

 

[Bob Ayers]

The later 95' up ones. It's very rare on older 3L's. But is a possibility.


I'd say you'd have to get dirty and diagnose this. Have a Chiltons? A digital multimeter(DMM)? Just follow the steps.

It's hard for anyone to accurately diagnose this over a keyboard without the help from the owner doing tests and posting results, UNLESS it's an ultra-common problem with tell-tale symptoms.

Ryan

The newer 3.0's don't have a distributer, they have DIS, and EDIS

 

[MrE_Powers]

The later 95' up ones. It's very rare on older 3L's. But is a possibility.


I'd say you'd have to get dirty and diagnose this. Have a Chiltons? A digital multimeter(DMM)? Just follow the steps.

It's hard for anyone to accurately diagnose this over a keyboard without the help from the owner doing tests and posting results, UNLESS it's an ultra-common problem with tell-tale symptoms.

Ryan

my pop had a 94 aerostar that had a distributor gear problem. it is similar to the camsync problem but when the gear goes in the distributor the engine shuts off as nothing spins the distributor. he put 2 new distributors in his van over the course of 2 years and after the third one died he just junked the van.

 

[adsm08]

The ICM provides the coil a ground pulse creating a di/dt
for the high voltage.

I know. And with the key off it should have no ground. If it has steady ground the could is never going to fire. If the wire is broken somewhere between the coil and the PCM the same problem is going to exist.

What year did the 3.0 switch over to DIS anyway? I know I've seen 3.8s (essentially the same engine) still using a distributor as late as 93.

 

[Bob Ayers]

I know. And with the key off it should have no ground. If it has steady ground the could is never going to fire. If the wire is broken somewhere between the coil and the PCM the same problem is going to exist..

Even with the key on, and the engine not running, you should measure 12V on both coil terminals.

A constant ground on the "pulsed" coil terminal should blow a fuse.