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Gary
Gary, Chevy Technician
Category: Chevy
Satisfied Customers: 17156
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: 6 years ago.
Category: Chevy
Expert:  Gary replied 6 years ago.
do you have any access to a scan tool to monitor computer data?
Customer: replied 6 years ago.
yea, i have a scanner. showing cranking rpms. and noid light indicated the injectors are pulsing.
Expert:  Gary replied 6 years ago.
are there ANY codes in the computer? and when you crank it the scanner is showing RPM'S correct?
Customer: replied 6 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 6 years ago.
once those old codes where cleared when you try to start it will it set ANY codes now?
Customer: replied 6 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 6 years ago.
ok.are there any BCM codes or VTD codes ?
Customer: replied 6 years ago.
cant find bcm or vtd codes in my scanner. just abs/pcm/engine
Expert:  Gary replied 6 years ago.
can you do step 5 and 6 on this chat and let me know what you find?graphic
Customer: replied 6 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 6 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 6 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 6 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 6 other Chevy Specialists are ready to help you
Customer: replied 6 years ago.
ran a new ground wire. runs good now!
Expert:  Gary replied 6 years ago.
great job.im glad my answer was acceptable!
Expert:  Gary replied 6 years ago.
good job by the way !
Customer: replied 6 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 6 years ago.
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