Cat 3116 Help - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 13 (permalink) Old 09-24-2011, 12:44 AM Thread Starter
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Cat 3116 Help

I have a 97 GMC 7500 with a Cat 3116. It's never given me any problems until recently the batteries have been dying. So I swapped out the batteries and disconnected the positive battery cable when it sat for about 2 weeks and now I can't get it started.
One thing I did notice is that the inatke heater light on the dash doesn't come on anymore when I turn on the ignition. The truck has 65K miles on it and about 10K hours. All of my other trucks are gas engines and this is obviously my only diesel so I have little knowledge on them.
I know this probably isn't much to go off of but any help would be great.
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post #2 of 13 (permalink) Old 09-24-2011, 10:05 AM
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What is the sn of the engine.
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post #3 of 13 (permalink) Old 09-25-2011, 07:59 AM
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You didnt forget to hook up any wires when you changed the batteries did you? And you changed them with the correct CCA battery?
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post #4 of 13 (permalink) Old 09-25-2011, 06:25 PM
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One thing that is easy to test is when you shut the truck off take a wrench, and put it across the pulley, if it is attracted the alternator, is not shutting down and that will drain the batteries quickly.
I have a wire and I check every fuse that is hot, and remove the fuse, and install the wire and with a clamp meter test the draw. Also test all hot fuses and remove it then reinstall if it shuts down that circuit needs to be investigated.
Glove box lights, under bunk lights are also common culprits.

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post #5 of 13 (permalink) Old 09-29-2011, 12:53 AM Thread Starter
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Originally Posted by mathura View Post
What is the sn of the engine.
Sorry for the delayed response. The SN # is 8WL02470 / it is a HEUI if thats what you were wondering.
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post #6 of 13 (permalink) Old 09-29-2011, 12:55 AM Thread Starter
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No all the wires have been hooked up just like before. I've been disconnecting the positive cable whenever the truck sits now. I just can't figure out why it won't start. All the fuses / circuit breakers are working and it cranks fine just won't fire up.
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post #7 of 13 (permalink) Old 09-29-2011, 01:24 AM
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If it is a Heui then it is not a 3116 it is a 3126,
You need 200 RPM to start.
Does it smoke white from the exhaust?
Does it have codes?
The only common update that I can think of is the timing reference sensor wires were modified to put in Gold Deutsch pins.

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post #8 of 13 (permalink) Old 09-29-2011, 01:28 AM Thread Starter
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If it is a Heui then it is not a 3116 it is a 3126,
You need 200 RPM to start.
Does it smoke white from the exhaust?
Does it have codes?
The only common update that I can think of is the timing reference sensor wires were modified to put in Gold Deutsch pins.
It's weird the owners manual says both 3116 and HEUI. Anyway there is no smoke coming from the exhaust while its cranking. Does this mean there is no fuel in the combustion chamber while cranking?
As far as codes I don't have a scanner to read them, but I can get ahold of one- good idea!
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post #9 of 13 (permalink) Old 09-29-2011, 04:17 AM
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A 3116 has unit injectors.
With no smoke be sure with the fuel primer pump, flush the system.
The one thing that normally causes this is the timing reference sensors. There are two of them, and they both have to fail to have a no start condition.
But get a code reader and have it checked.
Play safe!

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post #10 of 13 (permalink) Old 09-29-2011, 12:23 PM
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The engine that you have is 3116 with the HEUI fuel system based on the SN you provided. -8WL02470 and your ARR# should be 117-9615

The most common probelm with these engine is the actuation solenoid, located on the high pressure pump. Check and see if you are getting power to the solenoid with the ignition on. I would also suggest that you remove solenoid and clean it, sometimes corrosion prevents it from functioning properly.
The cranking speed is also important for the timing sensors to function, they are not common to malfunction once the connections are good.
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