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Gary
Gary, Chevy Technician
Category: Chevy
Satisfied Customers: 15704
Experience:  15 years GM master tech
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chevy k1500 03 chevy silverado with 5.3 has no spark. getting

Resolved Question:

03 chevy silverado with 5.3 has no spark. getting fuel. checked all fuses in underhood fuse block and drivers dash fuse block. all are good. i have power to the pink wire at the harness plug for the coils.
Submitted: 5 years ago.
Category: Chevy
Expert:  Gary replied 5 years ago.
do you have any access to a scan tool to monitor computer data?
Customer: replied 5 years ago.
yea, i have a scanner. showing cranking rpms. and noid light indicated the injectors are pulsing.
Expert:  Gary replied 5 years ago.
are there ANY codes in the computer? and when you crank it the scanner is showing RPM'S correct?
Customer: replied 5 years ago.
yup scanner is showing just under 200 cranking rpms. it had codes for a throttle body, zero volts on tps so i put a new tb in it. the old throttle body wouldnt open the throttle plate, now the throttle plate moves.
Expert:  Gary replied 5 years ago.
once those old codes where cleared when you try to start it will it set ANY codes now?
Customer: replied 5 years ago.
no codes after a dozen attempts to start. no pending no mil and no current codes. im using an otc genesis scanner
Expert:  Gary replied 5 years ago.
ok.are there any BCM codes or VTD codes ?
Customer: replied 5 years ago.
cant find bcm or vtd codes in my scanner. just abs/pcm/engine
Expert:  Gary replied 5 years ago.
can you do step 5 and 6 on this chat and let me know what you find?graphic
Customer: replied 5 years ago.
step 5 have power on both side4s of the pcm1 fuse
step 6. showing voltage on ign 1 with scanner. have 55 psi fuel pressure
Expert:  Gary replied 5 years ago.
at the coild does the black wire show a good ground when ohmed ?and your 100% sure you have no spark?
Customer: replied 5 years ago.
ok, the black wire at the front 2 cyl coils shows 0L on the multimeter. and so does the black wire an the harness plug for the coils.
Expert:  Gary replied 5 years ago.
ok the black should be a good ground.check G102 and G104 for being clean and tight.if they are ok then the ground wire is the problem from the coil to the ground locationsgraphicgraphic
Gary and other Chevy Specialists are ready to help you
Customer: replied 5 years ago.
ran a new ground wire. runs good now!
Expert:  Gary replied 5 years ago.
great job.im glad my answer was acceptable!
Expert:  Gary replied 5 years ago.
good job by the way !
Customer: replied 5 years ago.
you bet. the tach is a little goofy i noticed, but the guy didnt say if it has been that way before or not. either way, the truck runs. gold star for you
Expert:  Gary replied 5 years ago.
ty

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