Ignition problem

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Nov 10, 2019 | 01:42 PM

Big-1

Thread Starter

Tuned

Joined: Jun 2019

Posts: 328

Likes: 21

From: Mobile, AL

Ignition problem

Okay gents,
I need your help. 2007 Ford F-350 King Ranch PSD 4X4 with 240,000 miles. I am having a problem about every 10 starts. Very sluggish starting about 1 in 10 times. Just had to get a jump, let the truck run for about an hour, seems fine. Does this truck have an ignition module on it or should I just change the starter? I have had it bulletproofed and replaced batteries, and alternator. Had the truck for almost 6 years and 185,000 miles. Never changed the starter. What words of wisdom can you folks put on me? Thank you in advance.

John

Nov 11, 2019 | 09:09 AM

Fefanatic

Fleet Mechanic

Joined: Jan 2016

Posts: 1,804

Likes: 113

Your description isn't clear. Is it cranking slow? Does it crank a long time before starting? Does it run rough after the start for a few minutes? FWIW, there is no ignition module. The cop's are fired by the ecm and depend on signals from crank/cam sensors.

Now if you are having intermittent crank issues then it would be wise to check battery and all connections to battery including frame ground. If it is a hard start issue I would be replacing spark plugs and fuel filters. Be more specific with your questions and we can help better.

Nov 11, 2019 | 11:03 AM

Djosbun

Fleet Mechanic

Joined: Oct 2017

Posts: 1,704

Likes: 164

From: Southwest Ohio

I would perform a voltage drop test on both the positive battery cable as well as the negative cable. You will need a digital voltmeter to perform this test. It is very easy to do and you can quickly learn how by doing a quick YouTube search.

-- Dave

Nov 12, 2019 | 07:29 AM

Big-1

Thread Starter

Tuned

Joined: Jun 2019

Posts: 328

Likes: 21

From: Mobile, AL

It's early in the process of tracking down the problem, but I opened the fuse boxes and pushed everything down. I don't know. Electrical is an issue.

Nov 12, 2019 | 07:49 AM

Big-1

Thread Starter

Tuned

Joined: Jun 2019

Posts: 328

Likes: 21

From: Mobile, AL

About 1 time in 10, it will crank slow. Drives me nuts. I had to get a jump on a job site. Let the truck run for a long time. Every time since, fired fine. Driving me nuts!!! Got almost 240,000 miles. Drove back to Mobile from Manassas, VA yesterday. Flawless trip. Fired strong EVERY time I started it. We will see today.