crank no start

[98vortec]

alright i have a 1998 chevy vortec 350 2 wd ext. cab truck i got a crank no start problem has good compression, good fuel pressure but no spark. new cap roto plugs and wires swapped known good coil and ignition control mod. still no start i got no spark from coil i got new crank sensor i have power and ground at icm i need some help please

 

[east302]

Here are the diagnostics for a 98 350.

When you said you had no spark from the coil, was that no spark at the coil itself or at the end of the wire feeding the distributor cap?

If no spark at coil tower and power/ground are good at the coil and ICM, then the next step would be to see if the switching signals from the ICM to the coil and from the VCM to ICM are present.

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VCM connector pinouts:

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[98vortec]

thank u for the info. im not getting spark from the coil tower ill do more checking

 

[98vortec]

also i keep getting codes p0336 and p0339 even after i clear them when i go to crank engine and its not starting those same codes pop right up...

 

[east302]

If the VCM isn't getting a signal from the CKP sensor to begin with, that may be your problem. Did you do the relearn procedure when the sensor was replaced?

P0336:

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P0339:

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[chris kesl]

alright i have a 1998 chevy vortec 350 2 wd ext. cab truck i got a crank no start problem has good compression, good fuel pressure but no spark. new cap roto plugs and wires swapped known good coil and ignition control mod. still no start i got no spark from coil i got new crank sensor i have power and ground at icm i need some help please

i am having the same issue still havent gotten it fixed. new coil crank sensor ignition pick up. still no spark but what is really odd is that my fuel gauge is reading waay full past full and dosent change when the key is on or off. i replaced the fuel pump with gm part 3 weeks ago also put a new pigtail on the pump harness, and did a good job so im not looking for that to be an issue. the day it wouldnt start I replaced the fuel pump relay also. gonna work on it this evening and really look into testing things instead of throwing parts at it.

 

[shamrock246]

Check the harness going down to the sensor some have been damaged by heat from the exhaust manifold

 

[98vortec]

alright thank u

 

[98vortec]

well got truck going ended up being combo of crank sensor and igition control module my question is now which bank is bank 1 n 2 u got a bad upstream o2 sensor on bank 1

 

[east302]

Good deal, glad you got it sorted out.

Bank 1 is from driver side manifold.


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