99 chevy k1500 z71 no fire

[Jc1500]

Ok here goes....I have a 99 chevy k1500 I just recently had the 305 lock up right after changing intake manifold gasket. I found a 95 with the 350 and swapped the blocks switching everything so the sensors would all hook right back up in the truck. Got it all changed over then started the truck and it ran fine. Drove it about a quarter mile and it died. Started back up and drove it halfway back and it died again. Then started it up and pulled it back to the house and now it will not start. Motor turns over fine. Not getting spark to plugs and the only code I am getting is a p0336 which is crankshaft position sensor. Tried swapping two from other running trucks and it is still not turning over have no idea what to do or who to turn to at this point. Just had a 99 jimmy pull the same thing a couple months before and just haven't swapped motors since it quit running.

[MT-2500]

Originally Posted by Jc1500

Ok here goes....I have a 99 chevy k1500 I just recently had the 305 lock up right after changing intake manifold gasket. I found a 95 with the 350 and swapped the blocks switching everything so the sensors would all hook right back up in the truck. Got it all changed over then started the truck and it ran fine. Drove it about a quarter mile and it died. Started back up and drove it halfway back and it died again. Then started it up and pulled it back to the house and now it will not start. Motor turns over fine. Not getting spark to plugs and the only code I am getting is a p0336 which is crankshaft position sensor. Tried swapping two from other running trucks and it is still not turning over have no idea what to do or who to turn to at this point. Just had a 99 jimmy pull the same thing a couple months before and just haven't swapped motors since it quit running.

CODE DOES NOT SAY REPLACE PART.
Is the code a past or present or active code?
Always clear code and see if code comes back.
The code says crank sensor circuit performance problem.

Also check for spark right out of coil and if dist shaft is turning.
I would check all wiring and plug in on it first.

[j cAT]

with how all this occured my guess is you damaged the wiring or connectors to the ckp/pcm....

also check the distributor cap for arcing .

[Jc1500]

Originally Posted by MT-2500

CODE DOES NOT SAY REPLACE PART.
Is the code a past or present or active code?
Always clear code and see if code comes back.
The code says crank sensor circuit performance problem.

Also check for spark right out of coil and if dist shaft is turning.
I would check all wiring and plug in on it first.

The code showed up and I cleared it and it comes back. I changed the crank sensor like I said but nothing. The dist shaft is turning and all the plug wires are new. How do I check for spark out of the coil?

[Jc1500]

I don't really know how to check for a lot of these things with the distributor.

[Jc1500]

And where would I find the cranks sensor circuit? I know where the sensor is thats about it.

[j cAT]

Originally Posted by Jc1500

The code showed up and I cleared it and it comes back. I changed the crank sensor like I said but nothing. The dist shaft is turning and all the plug wires are new. How do I check for spark out of the coil?

new PLUG wires do not mean good wires. how did you route those wires OEM ? YOUR OWN WAY ? WIRES NEED OHM CHECK.

remove PCM connectors check for damage / corroded pins etc.. check harness for damage ...measure ohms for connection from the ckp to the pcm connector.. if you can only replace engines and you are not up to speed on this technical stuff best have a good repair shop with the proper tools and diagrams find the issue.

remove a spark plug and with the plug grounded to the engine the electrode spark should be blue. weak or no spark it then also can be distributor components ..timing should be checked if you do have some spark..

[MT-2500]

Originally Posted by Jc1500

The code showed up and I cleared it and it comes back. I changed the crank sensor like I said but nothing. The dist shaft is turning and all the plug wires are new. How do I check for spark out of the coil?

Jumper coil terminal to about a 1/4 in from engine and see if you have spark jump.
Or as in when I was a kid they always told me to grab it while engine cranking/running and see if it would knock my socks off.

But with that code present/coming back you need to check the crank sensor circuit.

[MT-2500]

Originally Posted by Jc1500

And where would I find the cranks sensor circuit? I know where the sensor is thats about it.

A good engine wiring diagram from a good repair manual/CD/REPAIR PROGRAM.
The wiring circuit is from where the wire plugs on to where it goes to including the plugin.

[procaddytech]

Alot of time the crank sensor will get overtightened and the knurled bronze threaded insert the sensor bolt screws into is pulling out of the composite front cover. The airgap is then too wide and problems like you describe will happen. I have seen it more than once. Insert should be flush to just below front cover surface. Sometimes they can be tapped back into the cover, apply loctite to the bolt and snug it and see what happens.

[Jc1500]

I will check the crank sensor and double check the wiring to the vcm. I'm not getting any spark at all at the moment and the computer stuff is getting to be a headache.

[MT-2500]

Originally Posted by Jc1500

I will check the crank sensor and double check the wiring to the vcm. I'm not getting any spark at all at the moment and the computer stuff is getting to be a headache.

Proper testing will give you the answer.
Let us know how it goes.
Good Luck

[Jc1500]

Well come to find out procaddytech was right on the money. Dad tapped the cps in with a screwdriver and hammer and texted me at work today and told me it was alive. I came home tonight and the truck purrs like a kitten. So much for all those who told me the block swap from the 95 wouldn't work. I have never been happier with a vehicle. 4 months off and on work was worth it.

[MT-2500]

Originally Posted by Jc1500

Well come to find out procaddytech was right on the money. Dad tapped the cps in with a screwdriver and hammer and texted me at work today and told me it was alive. I came home tonight and the truck purrs like a kitten. So much for all those who told me the block swap from the 95 wouldn't work. I have never been happier with a vehicle. 4 months off and on work was worth it.

If taping made it work it is time for to replace it with a good one.

[j cAT]

Originally Posted by Jc1500

Well come to find out procaddytech was right on the money. Dad tapped the cps in with a screwdriver and hammer and texted me at work today and told me it was alive. I came home tonight and the truck purrs like a kitten. So much for all those who told me the block swap from the 95 wouldn't work. I have never been happier with a vehicle. 4 months off and on work was worth it.

My guess is you did nothing with this work . DAD did it ! this explains much ...