Odd starting noise ‘93 F250


#1

Hi folks, I need help figuring out what I might be hearing.

When I go to start my truck, I hear what I can best describe as a knocking or skipping. Its only when I start the truck, I think the starter is going bad considering I recently fixed all wiring issues and I have a brand new battery, alternator, and connections.

Aside from the starter, what else might cause this sound? Bad spark plugs? I did have a code 172 (HEGO lean, need a new O2 sensor) could this be its doing?

If i could upload a video I did get the sound recorded.

On a side note; I fixed the last starting issue, which was the clutch master cylinder and thats been working great. And this sound is about a day old.


#2

One other note, it only does this when cold. I was just checking my code reader ans let the engine warm up, once I went to start it again it didn’t make the noise


#3

Key on engine off gives me an all clear, key on engine running won’t read the wide open throttle test. It also flashes the check engine light when I try (code reader causes this).


#4

If the truck has an automatic transmission, a cracked flex plate can make a knocking noise when starting the engine.

Tester


#5

I have a manual tranny.

After some looking, I think i may have a bad spark plug or distributor wire. If its not that when ill hand it over to a shop, pulling the engine apart is a little out of my league