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Old 08-14-2017, 05:39 PM   #21
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Dieseling is when a gas engine continues to run after it's turned off (fuel ignites with out being ignited by a spark.)

Last edited by veesix; 08-14-2017 at 06:09 PM. Reason: grammar upgrade
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Old 08-14-2017, 05:47 PM   #22
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Originally Posted by veesix View Post
I replaced the cap.

My Haynes manual says there's a "mark" for TDC on the inside of the distributor.

It says the rotor points to it at TDC. I checked but don't see a mark. Wheres the mark?
At TDC the rotor should point to the terminal inside the cap for the #1 spark plug. You may have to reinstall the cap to find out where it is and make your own mark. Also, it shouldn't diesel at all once the key is off. It's supposed to cut power to the ignition coil and the fuel injectors. I'd check to make sure you don't have an injector stuck open or something like that.
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Old 08-14-2017, 05:48 PM   #23
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At TDC the rotor should point to the terminal inside the cap for the #1 spark plug. You may have to reinstall the cap to find out where it is and make your own mark. Also, it shouldn't diesel at all once the key is off. It's supposed to cut power to the ignition coil and the fuel injectors. I'd check to make sure you don't have an injector stuck open or something like that.

Good point SBJ.
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Old 08-14-2017, 05:58 PM   #24
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Crazy thing happened in the garage yesterday.

I was planning to do a compression test so I let the engine idle and warm up. Then I pulled the coil wire.

Bad idea! I hear a boiling noise, and look into the throttle body. It's full of gas and the gas is boiling!

Could have started a big fire. Pushed the truck outside, grabbed a fire extinguisher, and restarted the engine to run out the extra fuel.

It that supposed to happen?

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Old 08-15-2017, 11:27 AM   #25
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No!

That is too short of a comment to write by itself as an answer, for some reason.
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Old 08-15-2017, 12:13 PM   #26
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Quote:
Originally Posted by veesix View Post
Crazy thing happened in the garage yesterday.

I was planning to do a compression test so I let the engine idle and warm up. Then I pulled the coil wire.

Bad idea! I hear a boiling noise, and look into the throttle body. It's full of gas and the gas is boiling!

Could have started a big fire. Pushed the truck outside, grabbed a fire extinguisher, and restarted the engine to run out the extra fuel.

It that supposed to happen?
My question is why did you pull the coil wire? Why not just kill the truck with the key inside or at least pull the fuel pump fuse so it runs it's self out of gas. You should always pull your fuel pump fuse before compression testing. This keeps the engine from getting flooded or you oil from getting gas logged during your comp test.

So if you let it warm up and just shut the key off do you get the same condition, of the fuel puddled up and boiling?
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Old 08-15-2017, 02:20 PM   #27
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Ya know, I was standing in front of the engine watching it idle, and the stupid idea just popped into my head. "Why don't I just pull the coil wire?"
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Old 08-15-2017, 07:20 PM   #28
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Ya know, I was standing in front of the engine watching it idle, and the stupid idea just popped into my head. "Why don't I just pull the coil wire?"
LoL we have all done things like that. It may have leaking injectors in the TBI unit. That's why I said run it till warm and then kill it with the key. Then look and see if it has a bunch of fuel sitting there again. If so I would start by changing those injectors out.
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Old 09-01-2017, 02:51 PM   #29
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Here's the plan. The truck is in the garage; I'll check the rotor position at TDC and if that checks out I'll perform a proper compression test.
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Old 09-01-2017, 05:49 PM   #30
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The rotor does not appear to be in the correct position at top dead center. I pull the distributor and moved the shaft counter clock wise one tooth. There is a small black sharpie mark at the position of the number one contact.
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