no spark how to trouble shoot coils? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

cagodinez · 08-31-2016, 01:28 PM

2008 5.3 engine will not start but, it does turn over and I have 80psi at the fuel rail when cranking, I checked for spark and nothing, how do I trouble shoot the coils? Should I pull the fuel rail along with the injectors to see if they are all spraying? Any help greatly appreciated.

**66ChevyMax** · 08-31-2016, 02:46 PM

Did you check the ignition fuse?

cagodinez · 08-31-2016, 06:25 PM

I checked all the fuses, they are good.

BR3W CITY · 08-31-2016, 08:24 PM

Take a look at the harness that branches off of each coil on to the main leg. Those wires can occasionally get pinched, pulled, or broken (usually when the valve covers needed to be accessed, the coils all get moved, and the harness gets damaged).

Do you not get spark on ANY of the leads, or just on a few? If you don't get spark on anything, its usually not the coils to blame.

jjzepplin · 08-31-2016, 08:35 PM

I used my old school timing light on my 2002 Toyota individual coils and it lights just a bunch of times instead of just once like the old gen 1's. I was able to locate the bad coil as it did not make any lights at all. I just clamped the plug wire clamp to the small wires going to the coils.

**dayj1** · 08-31-2016, 11:28 PM

Quote:

Originally Posted by cagodinez

2008 5.3 engine will not start but, it does turn over and I have 80psi at the fuel rail when cranking, I checked for spark and nothing, how do I trouble shoot the coils? Should I pull the fuel rail along with the injectors to see if they are all spraying? Any help greatly appreciated.

I know it's not specifically about the coils, but make sure that your engine sensors, coils, injectors, etc. are getting power when the ignition is in the "start" position. It's a common mistake to wire it up with a source that is only hot when the ignition is in the "on" position and not "start". Good luck!

cagodinez · 08-31-2016, 11:50 PM

ok so I checked all 8 coils going to the pink wire on each one of the connectors and they are all getting 12volts but, I checked the black wire on all 8 for chassis ground and nothing. I think I missed one of the grounds on the harness but I can't find it.

**66ChevyMax** · 09-01-2016, 09:19 AM

My harness had 3 ground wires that are tied to the block

ls1nova71 · 09-01-2016, 09:28 AM

Quote:

Originally Posted by cagodinez

ok so I checked all 8 coils going to the pink wire on each one of the connectors and they are all getting 12volts but, I checked the black wire on all 8 for chassis ground and nothing. I think I missed one of the grounds on the harness but I can't find it.

The ground for the coils is usually behind the power steering pump, on the left lower side of the block.

cagodinez · 09-03-2016, 02:19 PM

well well well what do we have here.....

ls1nova71 · 09-04-2016, 11:13 AM

Quote:

Originally Posted by cagodinez

well well well what do we have here.....

I'd say a ground that wasn't hooked up....

Good thing it wasn't touching anything, if it were, it may have run sometimes and other times not, which would have been harder to diagnose over the internet!

cagodinez · 09-04-2016, 06:37 PM

She fired right up but, the throttle is not responding, I think it's because I'm running a 2008 Impala pedal. Also I'm getting a misfire, I'm going to check the injectors.

cagodinez · 09-07-2016, 01:19 AM

Swaped D and F pins on the pedal connector and that did it, I'm getting instant throttle response. I erased the p2138 code hope it don't come back.

**66ChevyMax** · 09-07-2016, 08:23 AM

Congratulations!

cagodinez · 09-07-2016, 02:16 PM

Thank you Craig.

ls1nova71 · 09-08-2016, 10:56 PM

^^^^^ wtf?????

solidaxel · 09-08-2016, 11:18 PM

Quote:

Originally Posted by ls1nova71

^^^^^ wtf?????

YES !!

First post too!

I am sure there is a very good explanation for this................. maybe not!!!!

cableguy0 · 09-10-2016, 04:55 PM

Quote:

Originally Posted by solidaxel

YES !!

First post too!

I am sure there is a very good explanation for this................. maybe not!!!!

Its spam and has been removed. That person or robot will be removed from the site shortly.

cagodinez · 09-10-2016, 06:58 PM

Am I missing something???

ls1nova71 · 09-10-2016, 09:37 PM

Quote:

Originally Posted by cagodinez

Am I missing something???

Apparently you didn't see it, but there was a post that was like a hunderd lines or so, it was loooooong, something about football players or something, didnt read it all but it didn't make any sense to me.

cagodinez · 10-23-2016, 08:00 PM

Just wanted to thank everyone for your help, I got more input here than any other site, well maybe LS1TECH was helpful also, Ls1Nova would always respond to my novice questions. Took her out for the 1st time and it seems like I might have a vacuum leak, it revs really high when I'm at a stop.

08-31-2016, 01:28 PM	#1
cagodinez Registered User Join Date: Aug 2005 Location: Southern California Posts: 241	no spark how to trouble shoot coils? 2008 5.3 engine will not start but, it does turn over and I have 80psi at the fuel rail when cranking, I checked for spark and nothing, how do I trouble shoot the coils? Should I pull the fuel rail along with the injectors to see if they are all spraying? Any help greatly appreciated.

08-31-2016, 02:46 PM	#2
66ChevyMax Senior Member Join Date: Oct 2011 Location: Wolfforth, Texas Posts: 976	Re: no spark how to trouble shoot coils? Did you check the ignition fuse? __________________ Craig 1966 Chevrolet C10 - Supercharged LS3 1968 Chevrolet Camaro 1957 Chevrolet 2dr Hardtop "It makes sence if you don't think about it" Mesquite 1966 C10 - LS3 W/ Air Ride http://67-72chevytrucks.com/vboard/s...=1#post4989763

08-31-2016, 06:25 PM	#3
cagodinez Registered User Join Date: Aug 2005 Location: Southern California Posts: 241	Re: no spark how to trouble shoot coils? I checked all the fuses, they are good.

08-31-2016, 08:24 PM	#4
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: no spark how to trouble shoot coils? Take a look at the harness that branches off of each coil on to the main leg. Those wires can occasionally get pinched, pulled, or broken (usually when the valve covers needed to be accessed, the coils all get moved, and the harness gets damaged). Do you not get spark on ANY of the leads, or just on a few? If you don't get spark on anything, its usually not the coils to blame. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

08-31-2016, 08:35 PM	#5
jjzepplin Registered User Join Date: Feb 2012 Location: Ruskin Florida Posts: 4,566	Re: no spark how to trouble shoot coils? I used my old school timing light on my 2002 Toyota individual coils and it lights just a bunch of times instead of just once like the old gen 1's. I was able to locate the bad coil as it did not make any lights at all. I just clamped the plug wire clamp to the small wires going to the coils. __________________ 70 swb 4x4 406sbc 700r4 203/205 d60/14blt locker yadda yadda http://67-72chevytrucks.com/vboard/s...88#post6935688 Yeller 72 Blazer 2wd conversion project "No Daggum Money" http://67-72chevytrucks.com/vboard/s...d.php?t=550804 LS1-T56 3.73 LSD super budget build Blanco-2014 Sierra SWB https://67-72chevytrucks.com/vboard/...d.php?t=810350

08-31-2016, 11:50 PM	#7
cagodinez Registered User Join Date: Aug 2005 Location: Southern California Posts: 241	Re: no spark how to trouble shoot coils? ok so I checked all 8 coils going to the pink wire on each one of the connectors and they are all getting 12volts but, I checked the black wire on all 8 for chassis ground and nothing. I think I missed one of the grounds on the harness but I can't find it.

09-01-2016, 09:19 AM	#8
66ChevyMax Senior Member Join Date: Oct 2011 Location: Wolfforth, Texas Posts: 976	Re: no spark how to trouble shoot coils? My harness had 3 ground wires that are tied to the block __________________ Craig 1966 Chevrolet C10 - Supercharged LS3 1968 Chevrolet Camaro 1957 Chevrolet 2dr Hardtop "It makes sence if you don't think about it" Mesquite 1966 C10 - LS3 W/ Air Ride http://67-72chevytrucks.com/vboard/s...=1#post4989763

09-03-2016, 02:19 PM	#10
cagodinez Registered User Join Date: Aug 2005 Location: Southern California Posts: 241	Re: no spark how to trouble shoot coils? well well well what do we have here..... Attached Images

09-04-2016, 06:37 PM	#12
cagodinez Registered User Join Date: Aug 2005 Location: Southern California Posts: 241	Re: no spark how to trouble shoot coils? She fired right up but, the throttle is not responding, I think it's because I'm running a 2008 Impala pedal. Also I'm getting a misfire, I'm going to check the injectors. Attached Images

09-07-2016, 01:19 AM	#13
cagodinez Registered User Join Date: Aug 2005 Location: Southern California Posts: 241	Re: no spark how to trouble shoot coils? Swaped D and F pins on the pedal connector and that did it, I'm getting instant throttle response. I erased the p2138 code hope it don't come back.

09-07-2016, 08:23 AM	#14
66ChevyMax Senior Member Join Date: Oct 2011 Location: Wolfforth, Texas Posts: 976	Re: no spark how to trouble shoot coils? Congratulations! __________________ Craig 1966 Chevrolet C10 - Supercharged LS3 1968 Chevrolet Camaro 1957 Chevrolet 2dr Hardtop "It makes sence if you don't think about it" Mesquite 1966 C10 - LS3 W/ Air Ride http://67-72chevytrucks.com/vboard/s...=1#post4989763

09-07-2016, 02:16 PM	#15
cagodinez Registered User Join Date: Aug 2005 Location: Southern California Posts: 241	Re: no spark how to trouble shoot coils? Thank you Craig.

09-08-2016, 10:56 PM	#16
ls1nova71 Registered User Join Date: Dec 2009 Location: Independence Mo Posts: 4,119	Re: no spark how to trouble shoot coils? ^^^^^ wtf????? __________________ My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html

09-10-2016, 06:58 PM	#19
cagodinez Registered User Join Date: Aug 2005 Location: Southern California Posts: 241	Re: no spark how to trouble shoot coils? Am I missing something???

10-23-2016, 08:00 PM	#21
cagodinez Registered User Join Date: Aug 2005 Location: Southern California Posts: 241	Re: no spark how to trouble shoot coils? Just wanted to thank everyone for your help, I got more input here than any other site, well maybe LS1TECH was helpful also, Ls1Nova would always respond to my novice questions. Took her out for the 1st time and it seems like I might have a vacuum leak, it revs really high when I'm at a stop. Attached Images



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