7.3 IDI starting

[Oldlogger]

Hello, New to the forum. My son has a 88 7.3 that we had air in the fuel so we replace all injector seals and caps, lift pump, olive seals. added a check valve. The engine starts better but you have to give it a little throttle while cranking the engine for it to start right up. Do you think the injector pump is going bad. Other than that it runs great. Starts right up after that first start up. Thanks Vern

 

[Austin86250]

Yes, all mechanically injected diesels like throttle while cranking.

 

[Brian VT]

Hey, I dug around and found where I took a picture of the sunvisor instructions. Apparently you are always supposed to hold the pedal halfway.

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PC280010 by D Franklin, on Flickr

 

[Brian VT]

That said, mine starts fine with no throttle. Just the one pedal press before starting to activate the cold start (fast idle and timing advance).

 

[IDIBRONCO]

Yes, all mechanically injected diesels like throttle while cranking.

Even if it's warm outside, you should still "pump the gas" one time like you're setting an automatic choke on a gas engine. That sets the fast (high) idle so that it helps start the engine faster.

 

[Austin86250]

Even if it's warm outside, you should still "pump the gas" one time like you're setting an automatic choke on a gas engine. That sets the fast (high) idle so that it helps start the engine faster.

I always crank full throttle wether it’s 0 or 100

 

[CalIDI]

On the sun visor of my 7.3 IDI it says to give it throttle when cranking. 1/2 Throttle above 32 degrees, full throttle below.

 

[Nero]

I always full throttle when cold start regardless of temperature, if I've driven it that day I do half. Always works.

 

[Black dawg]

I have found that they all start slightly different, some pumps like WOT while others like just some throttle. Have had a few that start best with no throttle.

 

[Nero]

My batteries are on their last legs, this morning it was 30°f out, slow as hell cranking, but cycled the glow plugs twice, WOT, and she fired off after a few revolutions. Love these engines.

 

[captain720]

Mine hates WOT on start she won’t have it at all, but just some pressure and she fires right off.

 

[rreegg]

Do y'all have a block heater? Probably get laughed at a bit by some people but just I plug in if it doesn't get above 35F for a couple days. It'd start fine on the flow plugs but helps with time to full warm up - typically just give half throttle for starts under 65F and don't have any problems.

 

[Nero]

I have one, I have a short in my cable though.

 

[IDIBRONCO]

Mine decided to not work anymore. That's as far as I've looked into it. I usually don't have to drive when it's too cold so it's not at the top of my to do list.

 

[Nero]

I like using it cause it is nice having a heater right away, but I need to fix mine... Don't drive my truck enough to justify fixing it yet though....as I say sitting in it at a fuel station lol