Question about 1991 GMC K1500

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GM 305ci. No start

I'm trying to repair a 1991 GMC C1500 305ci. I replaced the timing chain, have checked and rechecked the alignment of the gears and distributor yet cannot get the engine to run. There is spark and fuel and the engine barks, but will not run.

Any ideas ?

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Make sure you have number one cylinder at top dead center, do this by removing the spark plug and puttin a screw driver in it, when it gets to the top stop, you turn the motor by using a socket on the crank shaft, if you do not get the cylinder to top dead center this will cause the problem, how ever this means you have to remove the chain again and realign every thing.

Posted on Nov 26, 2008

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Posted on Jan 02, 2017

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First, visually inspect the cam and crank sensors and their harnesses for damage. If you notice broken/frayed wires, repair and recheck. If you have access to a scope, check the cam and crank patterns. If a pattern is missing, suspect a bad sensor or a slipping tone ring. Remove the cam gear and the crankshaft harmonic balancer and inspect the tone rings for proper alignment and make sure they're not loose or damaged or that they haven't sheared the key that aligns them. If they are properly installed, replace the sensor. If the signal appears normal, then check the timing chain/belt for proper alignment. If it's misaligned, check for a damaged tensioner that may have allowed the chain/belt to slip a tooth or several teeth. Also check that the belt/chain isn't stretched. Repair and recheck

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  1. First, visually inspect the cam and crank sensors and their harnesses for damage. If you notice broken/frayed wires, repair and recheck.
  2. If you have access to a scope, check the cam and crank patterns. If a pattern is missing, suspect a bad sensor or a slipping tone ring. Remove the cam gear and the crankshaft harmonic balancer and inspect the tone rings for proper alignment and make sure they're not loose or damaged or that they haven't sheared the key that aligns them. If they are properly installed, replace the sensor.
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I replaced the camshaft position sensor P0340, now the OBD is reading a PO0016


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  • Misalignment of timing belt/chain
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  • Tone ring on camshaft slipped/broken
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  1. First, visually inspect the cam and crank sensors and their harnesses for damage. If you notice broken/frayed wires, repair and recheck.
  2. If you have access to a scope, check the cam and crank patterns. If a pattern is missing, suspect a bad sensor or a slipping tone ring. Remove the cam gear and the crankshaft harmonic balancer and inspect the tone rings for proper alignment and make sure they're not loose or damaged or that they haven't sheared the key that aligns them. If they are properly installed, replace the sensor.
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Rather than getting into a long winded write up....just go to your local auto parts store and purchase a vehicle specific repair manual. It'll contain the specific directions you'll need to perform the job.

Its very important to make sure you get it properly timed before you re-assemble. PAY PARTICULAR ATTENTION to the section telling you how to line up the timing marks on the crankshaft gear and the camshaft gear. Also, take time to closely inspect the gear teeth for any signs of wear / damage. This is the perfect time to replace them if needed.

It's also important to make sure you've cleaned all gasket mating surfaces thoroughly so as to prevent oil leaks.

This isn't a particularly difficult job, but it can be tedious. Don't get discouraged if the first time you put the chain on the timing marks have moved and no longer lineup. Odds are the camshaft, not the crankshaft will move out of alignment.

Persevere and it'll all work out.

Good luck!

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