Too much fuel. - Ford Powerstroke Diesel Forum
7.3L IDI (Non-Powerstroke) Diesels Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

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Old 01-01-2010, 11:05 PM
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Too much fuel.

Today I bought a 1993 F-350 with a 7.3 IDI. It has a fuel injector or pressure problem...

When started it idles with white smoke, but pressing the throttle produces a LOT of black smoke. Former owner (a mechanic) says an injector is bad and delivering too much fuel. I had it towed to avoid washing out the cylinder.

Is there an "easy" way to diagnose which injector is delivering too much fuel?

Is there anything else obvious I can check?

My only previous experience with diesels is working on 80s Mercedes 240D 300D engines... Please be gentle with me!
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Old 01-03-2010, 04:54 PM
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Im not sure at all but just throwing this out there.
If it was just one or two bad injectors wouldnt it puff smoke, not pour out smoke continously.
Makes me think something might be wrong with the injection pump.
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Old 01-03-2010, 05:46 PM
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I've also looked for info on which adjustment turns down the injection pump. Haven't found it yet. Found the travel adjustment and the idle adjustment.

When I search the forums, I *always* get no results so I have to read every thread!
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Old 01-03-2010, 05:53 PM
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the pump could be turned up. When i had my IDI i had the pump turned up and it smoked a good bit.
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Old 01-04-2010, 01:00 AM
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*grins*

I wish it was just smoking a good bit. Unfortunately, it's smoking can't see the road or breathe. Injectors are coming in tomorrow.

To get it through inspection I need to do the following:

fix the fuel problem
fix leaking steering hose
two new tires
A gear shift lever and knob!!!
replace shocks
replace some bushings
license tag lights

That's just the basics to get through inspection. Then I need to fix the broken fiberglass, replace the windshield and most of the running lights, repaint it, and it needs basically everything replacing inside - seats, doorliners, dash trim parts, climate control knobs, radio, door locks...

The truck is currently black, though the black's worn off enough it's got a pink hood. I always have white work trucks, but I'm considering silver as an option.

Fun times!
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Old 01-04-2010, 02:16 PM
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Pictures!

I took some photos today...

Here she is:


The engine is quite clean, and it's obvious it was well maintained:


The interior is pretty trashed out.

So, the injectors are coming in tomorrow... Fun times!

Last edited by plasticuser; 01-04-2010 at 02:18 PM. Reason: Fixed links to images
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