Clicking noise

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Jan 16, 2023 | 11:40 AM

casey_kreilein

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Clicking noise

I continue to try to get the truck with all the missing parts started. It looks like I have everything hooked up again and I’m trying to get it to turn over today. I have attached a video with this weird clicking noise that I’m trying to determine where it is coming from.

The truck still won’t turn over. I’ve checked fuel pressure at the rail. I have spark coming with the number one spark plug and I believe I have it timed with the distributor to the top dead center compression stroke.

Any help would be appreciated.

Jan 16, 2023 | 11:43 AM

casey_kreilein

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The movie didn’t want to attach to the original post.

Attached Files

FullSizeRender.MOV (5.52 MB, 38 views)

Jan 16, 2023 | 08:33 PM

Prototypemech

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From: Mojave, Ca

Have you tried disconnecting your IAC to see if the clicking stops when it's disconnected?

Jan 16, 2023 | 08:36 PM

casey_kreilein

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I have not, but I’ll give it a try when I’m in there next time.

One thing I did find out is if I hold the throttle open it will stop.

Jan 16, 2023 | 08:52 PM

Prototypemech

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From: Mojave, Ca

Yup, when you stomp on the throttle, the computer ignores the Idle Air Controller (IAC) because it sees the throttle is open and it's no longer at idle.

Jan 16, 2023 | 08:55 PM

casey_kreilein

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Can a fault IAC keep the engine from starting? And then when the throttle is wide open it also won’t start because the computer shuts off the fuel injectors if it isn’t running already?

Jan 16, 2023 | 09:12 PM

Prototypemech

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From: Mojave, Ca

A bad IAC won't keep the engine from running. And the ECU won't inject fuel unless it sees the engine spinning.
I've never seen an IAC go berserk like that. The ECU knows when the engine is running and only activates the IAC when it sees the engine running.
I'm leaning towards you having a bad ECU. Does your check engine light work? Can you pull ECU codes? Does your fuel pump prime itself for 1-2 seconds, then turn off, when you turn the key to 'on'? If you say 'no' to any of these questions, the ECU is suspect.

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Jan 16, 2023 | 09:16 PM

casey_kreilein

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Quote:

Originally Posted by Prototypemech

I've never seen an IAC go berserk like that. The ECU knows when the engine is running and only activates the IAC when it sees the engine running.
I'm leaning towards you having a bad ECU. Does your check engine light work? Can you pull ECU codes? Does your fuel pump prime itself for 1-2 seconds, then turn off, when you turn the key to 'on'? If you say 'no' to any of these questions, the ECU is suspect.

I haven’t ever had the truck running to see if the check engine light comes on. I’ve already heard about the fuel pump not shutting off being a sign for a bad ECM. I ordered one of the code readers that I’ll check when it gets here. But if it can’t pull codes I’m pretty sure that it is a bad ECM.

The thing that really sucks about this is I just got this ECM because they original was missing, long story.