1996 k1500 5.7 vortec...cranks but wont start

20

Asked by Dec 16, 2014 at 03:44 PM about the 1996 GMC Sierra C/K 1500

Question type: Maintenance & Repair

1996 gmc 1500. 312k on chassis and 120ish on motor and trans. was running perfect
for 2500 miles since motor swap and then sat for 4 days. not cranks but wont start. it
kind of just stumbles a time or two when you let of key.

I have replaced coil, cap, rotor, crank sensor, ignition control module, fuel filter, fuel
pump...what else am i missing? putting fuel down the intake makes no difference.

i did notice i have spark at the coil wire but not at the number one plug wire.

10 Answers

75,325

If you have fire a coil,and not getting fire through the distributor,check the the ICM,in the distributor,iginition control module.

3 people found this helpful.
75,325

I know you have replaced it,but if it is not firing that will be the issue,new part,s are bad all the time.

1 people found this helpful.
20

the icm on this truck is not on distributor but rather next to coil attached to heat sink. doesnt it just control the pulsating of the spark though? the spark from the coil does pulsate.

2 people found this helpful.
75,325

Ok ,you say you are getting pulse to the coil,but not going through the distributor,check the distributor again.

1 people found this helpful.
75,325

You said you don,t get fire at the number one plug,,but do you get fire at the rest of them?

2 people found this helpful.
21,905

Still check the icm

2 people found this helpful.
20

Well it ended up either being moisture in the distributor or plug wires. Blew out distributor and get it to fire a little. after replacing all the wire it finally ran! Thanks for the help guys!

515

This is just a helpfull tip for the owners of 1995 thru 1997 Chevy or GMC trucks with the 5.7 vortec engine.I have learned that if you stick with AC DELCO products when replacing parts the better off you will be.For some reason the vortec engine is very picky when replacing parts such as plugs,wires rotor cap and so on.Trust me on this I learned the hard way.

2 people found this helpful.
30

what a icm

3 people found this helpful.
35

The ICM or the Ignition Control Module is the brains behind the spark plugs.

2 people found this helpful.

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