1997 GMC Code 1345

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1997 GMC Code 1345

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Author	Topic: 1997 GMC Code 1345
phipps Junior Member	posted 02-20-2002 08:07 PM My brother has a 1997 GMC Sierra 4x4 with the 5.7L engine. He has a code 1345. I'm not sure if it is an engine code or network code. Any ideas what could cause this code? (He does have a keyless start on the truck. Didn't know if that could be the problem.) Also he has been having problems with it starting after it has been sitting for several hours. Could this code be the problem, although he had this code this summer w/o any starting problems. Could an injector be leaking, causing fuel to "puddle" in the cylinder, causing it to flood? Does such a thing even happen? Any ideas anyone can give us would be greatly appreciated. IP: Logged
carfixer Member	posted 02-21-2002 04:43 PM That code is set when the cam sensor signal is detected at the wrong time when compared to the crank sensor signal. You really need a scan tool to perform tests on this code, but make sure the distributor is installed correctly and the wiring and connectors to it are in good shape. IP: Logged
phipps Junior Member	posted 02-21-2002 05:20 PM Doesn't that engine have a distibutorless ignition? IP: Logged
phipps Junior Member	posted 02-23-2002 09:44 AM Ignore my last post......guess I should have looked before I opened my mouth!! Does anyone have any ideas about the hard cold start problem? gary IP: Logged
carfixer Member	posted 02-23-2002 04:53 PM Do you have a junk yard that'll let you try a distributor for a day or two? IP: Logged
phipps Junior Member	posted 02-23-2002 09:28 PM He went out this morning and the truck wouldn't start at all. After he let it sit for several hours and it warmed up outside, the truck started. Do these symptoms sound like a distibutor? Gary IP: Logged
carfixer Member	posted 02-23-2002 10:22 PM The sensor in the distributor can be temperature sensitive. IP: Logged
phipps Junior Member	posted 02-24-2002 08:01 AM Is there any way that he and I can test the distributor before replacing it? Will we have to replace the whole distributor or just the sensor? Could this sensor give the 1345 code? Sorry for all the ?'s, just tryiong to save him some $. IP: Logged
carfixer Member	posted 02-24-2002 12:15 PM Check the power and ground to the sensor when it is cold. If the power and ground are good test the signal while cranking and see what you get. You'll need a good DVM to do these tests. IP: Logged
phipps Junior Member	posted 02-24-2002 05:19 PM Well, here is where we sit....my brother changed the plugs today. He took it for a drive and it began to miss real bad, bad enough to trigger a flashing MIL. He got it home and called me. When I got there and we tried to start it, nothing, not even a sputter. I checked all the connections and plug wires and all were okay. We have spark, I pulled a plug and had him crank it. Only a yellow spark though, thought it would be blue. If I press on the valve on the fuel rail while cranking, fuel squirts out so we have fuel. I pulled the dist cap and it didn't look too bad. The manual I have states that a bad cam sensor won't affect driveability, so I don't think it's that. Would a bad crank sensor cause these problems? When I pulled the plug to check for spark, it was dry even though we had tried to start the truck several times. Thought it would be wet with gas. We did spray some starter fluid into the throttle body and the truck would run on the ether, but it died as soon as the ether was gone. Any other ideas? It's looking like it's headed for a trip to the, dare I say it, dealer!! Gary IP: Logged
phipps Junior Member	posted 02-24-2002 07:51 PM Could a bad ignition module cause this problem? IP: Logged
Matt300 Member	posted 02-24-2002 10:21 PM How long does it run? IP: Logged
phipps Junior Member	posted 02-25-2002 06:25 AM On gas, it doesn't run at all. If we spray some starter fluid into the intake, it will run until the fluid is gone and then it immediately dies. I've had an ignition moduel go bad on another vehicle and this does act a little like that, but wouldn't you NOT have spark with a bad ignition module? We've got spark, the truck runs on the starting fluid. I don't think we are getting fuel into the cylinders. When I pulled a plug after trying to start it several times, the plug was dry, no gas on it. Gary IP: Logged
carfixer Member	posted 02-25-2002 08:20 AM If that's the multi point injection rather than the throttle body it sounds like your not getting the FC signal from the ICM (ignition control module) to the PCM. The ICM processes the crank/cam signals and sends a FC (fuel control) signal to the PCM for timing/firing the injectors. If you have fuel pressure and yet fuel is not being delivered the FC signal is not present. You can verify this with a noid light, scope, or by using a stethescope and listen at the injectors for the clicking of the solenoid. If FC signal is lost the culprit is most likly the ICM, but the PCM could be at fault. The best thing to do is monitor the FC signal from the ICM to the PCM and see if it goes bad when the problem occurs. IP: Logged
phipps Junior Member	posted 02-25-2002 03:35 PM Carfixer, So the ICM does control fuel delivery? I just thought it only controlled spark delivery. Guess I learn something new everyday. Yes it is the multi-point injection system. I think my brother is going to break down and take it somewhere. If he does, I will be sure to let everyone know what it turns out to be. I appreciate all the good replies and suggestions. I have a truck with the exact same system so I'm paying attention to what his does so I can fix mine if it ever goes bad!! gary IP: Logged
carfixer Member	posted 02-26-2002 07:47 AM In a GM full function ICM the circuitry that produces the FC signal for the PCM is in the ICM. IP: Logged
phipps Junior Member	posted 02-26-2002 05:41 PM Fuel pump strikes again!! We just went and picked up the truck. Turns out the fuel pump was bad!! If only I'd had a pressure tester, maybe I could have caught it! Apparently it was pumping, just not enough. The mechanic wasn't in so we couldn't ask him about the 1345 code. The mechanic did tell him on the phone that his gas gauge may not work or if it does work it may be inaccurate now. Does anyone know what the deal with that is? The mechanic made mention of a part that gets corroded and that this part is expensive to replace so they replace the pump and not this other part.(My brother wasn't sure what the part was. The mechanic talked to our mom not us.) Does this sound familiar? He said it happens on a lot of these trucks that he works on. Might explain why the gas gauge on my truck doesn't read right. Thanks again for all the excellent replies and suggestions. Gary IP: Logged
carfixer Member	posted 02-26-2002 07:53 PM Sounds like the mechanic broke a pin off the fuel level sender. IP: Logged
Externet Junior Member	posted 03-02-2002 02:31 AM Hi Phipps. Your fuel pump is kaput. Mick IP: Logged

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