Mechanics

CODE 1351 I CAN NOT GET THIS TRUCK TO START EVERY TIME

1998 Chevrolet Silverado • 11,700 miles

I have been working with this truck all summer and fall to get it running and reliable. Its a 1998 chevy silverado Z71 extcab 5.7L Vortec.
This vehicle has gremlins in it. I swear. So far I have replaced the entire distributor assembly, new plugs, new wires, new fuel tank-(rusty), new complete fuel pump assembly-( Twice), new coil, new ignition control module-(twice)first one was the economy style truck would start and run for a couple of days off and on then replaced it again with the code 1351 came up again then, the second one was the premium style, changed it yesterday truck will only turn over and when you let off the key it will pop back through the air breather ( K&N Style)had the fuel pressure checked, they said it was ok. One day this week I went out and turned the key and it would not start. So I shut off the key and turned it on again and pumped the hell out of the throttle while the engine turned over and got a pop. I kept pumping the throttle fast and after 3 attempts of this it started. And I took it down our side road and hammered it down. It ran great. Lots of power, and idled excellent. Shut it off and it didnt even take a whole revolution and it started. I am in wisconsin and the temps here are 26 degrees. I went out today to try it and it is back to not starting again. Just back pops through the breather again. Its like this all fall cant trust it when it does run to take it anywhere. What do I do? Steve
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Stubby61
December 9, 2011.




Steve. This is a good one because you replaced just about everything. The code indicates a high power circuit to the enhanced ignition system (EIS). The The EIS provides timing input to the VCM via a crankshaft sensor. The VCM then uses the pulse from the crank sensor for ignition timing. Each pulse from the VCM signals the coil. (Too many sensors.)

My question then is this. Have you checked or replaced the crank sensor? It is my belief that if you are to check for spark to the plugs, you will find either no spark or a very weak spark. Thus, the truck won't start.

Let me know.
Joe

Hello, thanks, yes I forgot that was one that I had replaced too was the crank sensor. The shop I took it into said the sensor was not reading correctly so he replaced it with a Genuine Gm sensor. Then he got a good reading. Truck ran fine for two weeks. My son was back home from the marines on leave and it ran fine for him. When he went back a couple of days later I went to use it and it was back to the same old thing.

Tiny
Stubby61
Dec 9, 2011.
Do me a favor, check to see if it is getting spark when it doesn't start. I need to know if that is causing it not to start.

Ok will do. Have to get to bed, up for work at 3: 30 am. Its 9: 18pm here now. I will get right on that after work. Thank you very much for your quick reply. Steve

Tiny
Stubby61
Dec 9, 2011.
Steve: Let me know what you find. IT's 10: 29 here and I need to do the same. However, I'm glad I don't have to get up as early as you.

Take care,
Joe
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Hello Joe, sorry for the late reply, it has been pretty busy here. I checked on spark and had it. I decided to replace the coil one more time and I hit the key and she fired right up. Shut it off and tried restarting it several more times and it fired right up. I gave it the next test and tried it the next day. Success ! Tried it again the next day and then took it on a 20 mile round trip short jaunt and it is running again. So that seems to have been the problem. The mechanic that I had it at said he measured the output of the coil the first time and said it was not putting out exactly what a new coil would that he tested but was good enough. The truck was running good after he had done that but only for a couple of weeks then it was back to the not starting thing. Good enough I dont think so. Should have went with my gut on it after he said that, and replaced it. Would have been a lot less grief. So thank you for your help. Now I will know better next time. Please let the other people that has the code 1351 know to Replace the Coil even if you had already done so. New parts can be faulty. Thanks guys. Steve

Tiny
Stubby61
Dec 13, 2011.
Glad you got it going. And I couldn't agree more. New parts are not always good. Take care and have a nice Christmas.

Joe

This is great BUT, I have had the same problem and replaced the coils (runs great for a few weeks) then coil goes out again. Have replaced three (3) coils in less than 7 months! What is causing them to play ut so quickly?
1997 gmc sierrra with 4.3 engine. Plugs, wires, coil, dist cap, rotor button, sensor, (all the electrical components except crank sensor). Truck runs perfect for teo to three weeks then stops and a code 1351 comes back to light (sometimes a "random mos-fire will pop up). Thing is bout to drive me nuts. Hate to go to garage at $75.00 per hour on an electrical problem!
Cecil

Tiny
Cecil p
Oct 22, 2012.

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