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Snowcat Restoration & Modification Projects Forum Major Restorations, Upgrades, and Non-Stock Snowcat Modifications

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Old 07-11-2018, 09:36 PM
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Default Fuel Injected LMC1200

I decided we were done fighting fuel and carburetor issues on this cat. After much research and some advise from here I had the AFI fuel injection system purchased and installed. I talked to Norm and he suggested that the GSE/Industrial (300 CID Ford) Gen 2 system would be ideal. I wanted to keep the throttle linkage intact so that the automatic transmission would shift properly. The Gen 3 is a drive by wire and would be ideal for a manual transmission.



https://www.affordable-fuel-injection.com/




The kit was complete and fairly straightforward to install. The mechanic was very impressed. The complete ignition system is also included.



It was mostly a bolt on and wire in project. The O2 sensor was a breeze as the manifold was ready for the sensor.



The throttle linkage ended up being a minor issue. They decided to add a cable to operate the throttle plate. The original carb linkage was in a different position by 90 degrees. The factory setup wasn't going to easily work. The kickdown is still connected and should work correctly.



The day I drove around it was 90 here so it was a short trip around the dirt parking area.



One other issue popped up. It wouldn't run over 3,000 RPM. I sent the ECU back and it was reprogrammed to govern at 4,000. Should be plenty.



Need snow!
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Old 07-12-2018, 07:47 AM
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Default Re: Fuel Injected LMC1200

Where did you place the coolant temp sensor?
-Pat
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Old 07-12-2018, 09:30 AM
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Default Re: Fuel Injected LMC1200

Please update the thread with runnability updates as you get more run time in varied conditions.

the Midwest doesn't present much differential in air density due to elevation, but our closed loop systems get surprised with temp extremes and humidity.
ECU's don't always make quick adjustments (which is a good thing) we get severe frosting and silly run-ability issues that go away as fast as they present just from weather changes.
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Old 07-12-2018, 09:41 AM
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Default Re: Fuel Injected LMC1200

"Where did you place the coolant temp sensor?
-Pat"


It's under the rear of the exhaust manifold. I'll snap a photo of it.
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Old 07-12-2018, 09:10 PM
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Default Re: Fuel Injected LMC1200

Coolant sensor was installed with a T off of the coolant gauge sensor location.
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Old 07-13-2018, 12:38 AM
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Default Re: Fuel Injected LMC1200

you need to put fuel injected sticker on it.
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Old 07-14-2018, 07:11 PM
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Default Re: Fuel Injected LMC1200

Great Job. You are going to love the way it runs. Is there an ALDL or OBD plug that you can interface a laptop for trouble shooting? Does that system control spark timing also?

9 years ago I replaced the quadrajet on my 455 Olds powered motorhome with a TBI and never regretted it. I have done a couple of them now from junkyard parts. Vast improvement over a carburetor.
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Old 07-18-2018, 05:24 PM
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Default Re: Fuel Injected LMC1200

To answer a few questions. It does have an OBD2 plug. It does control the advance. I was able to plug a laptop into it and perform some trouble shooting.

It was idling way too high. 2 issues. The mechanic installed the engine coolant sensor incorrectly and it had too cool of a thermostat. I moved the sensor and put the temp gauge sender in the block drain opening.

AFI says the engine temp must be over 180 to run correctly. They are not kidding.

Now it works great. Ready for snow.
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Old 07-18-2018, 05:30 PM
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Default Re: Fuel Injected LMC1200

Second pic wouldn't load. Temp gauge sender.
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Old 07-18-2018, 09:46 PM
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Default Re: Fuel Injected LMC1200

A computer tbi will hold a fast idle as long as it thinks the engine is cold.
The dash temp gauge is probably going to read real low now because the block is the first thing the cool water from the radiator and water pump hits. Most of the heat is picked up in the head.
Is your system a fixed program for that specific engine or can you modify it from a laptop? Dynamic EFI makes a system using a GM ECM that they modify with EBL (embedded lockers) that can be flashed on the fly. I have some friends that use it but it seems like they are always messing with it. Mine is a stock programmed chip that works good and I never have to dink with it.
Does the AFI have a knock sensor? The GM system mounted it in the block drain hole.
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