Spark plug gap question
Thread Starter
Teching In
Joined: Dec 2012
Posts: 14
Likes: 0
Spark plug gap question Hello all,
I am checking on a rip off mechanic that charged me 600$ just to change fuel filter oil and plugs and wires and what they call diagnosing that they didn't solve to begin with.
They installed ac delco 41-805 spark plugs which are platinum I might change to iridium now . I am still having a slight misfire issue even though it got much better after i cleaned the MAF and throttle body as they were extremely dirty.
I took the new plugs out to see if I was still running rich, which indeed I am so I checked the gapping on the spark plugs as well and the one I am looking at is set to .45? Just to verify dont they need to be set to .60?
I am checking on a rip off mechanic that charged me 600$ just to change fuel filter oil and plugs and wires and what they call diagnosing that they didn't solve to begin with.
They installed ac delco 41-805 spark plugs which are platinum I might change to iridium now . I am still having a slight misfire issue even though it got much better after i cleaned the MAF and throttle body as they were extremely dirty.
I took the new plugs out to see if I was still running rich, which indeed I am so I checked the gapping on the spark plugs as well and the one I am looking at is set to .45? Just to verify dont they need to be set to .60?
I did research on this and .040 gap is what the gap is as of 2003. I just bought my z28 and the spark plugs are gapped at .040 but you don't have to take my word for it just do a search you'll find it.
TECH Fanatic
Joined: Jan 2012
Posts: 1,076
Likes: 0
.45 is almost half a inch.... and .6 is over half a inch. those both are way to big unless you mean .045 and .06. see if all the plugs are gapped the same. if all of the wires are new it could be a coil pack. do you have any thing to show you what cylinder is missing and how much?
Thread Starter
Teching In
Joined: Dec 2012
Posts: 14
Likes: 0
sorry typo meant it was set at .045 and asking since they are platinum plugs set to .06 which i did find the answer for.
http://www.ls1.com/forums/f6/spark-plug-gap-123602/
and yes when they ran the diagnosis they found cylinder 4 misfiring. Both plugs and wires are new when they changed them just to the wrong gap evidently. I am just going to switch to iridium and steer clear of this mess again because changing these suckers are some what a pita.
Any way to check the coil pack without a OHM meter? I see that on youtube.
I did pop the hood with it running at night didn't see any spark jump. If thats a way to know
http://www.ls1.com/forums/f6/spark-plug-gap-123602/
and yes when they ran the diagnosis they found cylinder 4 misfiring. Both plugs and wires are new when they changed them just to the wrong gap evidently. I am just going to switch to iridium and steer clear of this mess again because changing these suckers are some what a pita.
Any way to check the coil pack without a OHM meter? I see that on youtube.
I did pop the hood with it running at night didn't see any spark jump. If thats a way to know
TECH Fanatic
Joined: Jan 2012
Posts: 1,076
Likes: 0
What cyinders where missing? Just ome whole side? I would check the ground for the coils. http://www.knology.net/~rv7rotary/Wi...S1%20coils.jpg that shows you how they are wired. Make sure the one big plug for the harness isn't loose
Trending Topics
Thread Starter
Teching In
Joined: Dec 2012
Posts: 14
Likes: 0
Thanks for the diagram ill print it out and check them, I know the main connector isnt loose ive played with it a lot over the weekend trying to diagnose the problem, and the mechanics and my scanner picked up misfires on cylin. 4, they were able to get a number of 1400, odd thing is nothing is setting off a CEL light. I even checked the pending and nothing there. I do know something funky going on with the electronic system as at night my lights will dim and brighten back up and sometimes even hitting the gas they go almost out. Not sure what that is about
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Florida, welcome to LS1tech!
What year is your ride?
Personally, I've found bigger is better when it comes to plug gaps-especially with the high output coils of an LS engine. Just make sure they all match.
The spark plugs on the drivers side are pretty easy.
Passenger side: Remove the coil packs are one unit from the valve cover leaving the plug wires still connected to the spark plugs. This makes it nice and easy to replace them plugs.
Most people around here use the regular NGK TR55 plugs.
What wires are you using? Your hesitation/miss/stumble may be cured with Granatelli zero Ohm wires.
What year is your ride?
Personally, I've found bigger is better when it comes to plug gaps-especially with the high output coils of an LS engine. Just make sure they all match.
The spark plugs on the drivers side are pretty easy.
Passenger side: Remove the coil packs are one unit from the valve cover leaving the plug wires still connected to the spark plugs. This makes it nice and easy to replace them plugs.
Most people around here use the regular NGK TR55 plugs.
What wires are you using? Your hesitation/miss/stumble may be cured with Granatelli zero Ohm wires.
You can also just swap that coil pack with one from another cylinder and see if the problem goes to the next cylinder. If not then the misfire code can be because of a dirty/ failing injector.
Thread Starter
Teching In
Joined: Dec 2012
Posts: 14
Likes: 0
2000 camaro, with 136k miles, wires are B and B 8mm wires, Wandering if justin is on to something i remember one time I hit my drive way a little too fast with those stupid gutter systems and the whole car almost died on me but came right back up. I have checked the main ground from the battery and the ground on the driver side near fuse box didnt see anything, that diagram justin gave me I am going to compare to the cars and see if i can find anything
First , an engine missfire can be caused by something in the ignition but also can be 1 or more of a whole bunch of possible issues that are'nt part of the ignition system such as low compression which has a few possible causes ,,,,dirty injectors certainly can and will cause all sorts of problems ,,,,,also an intake leak or even an exhaust leak will affect the running cylinder pressure . As far as grounds are concerned You usually can't see anything wrong ,,,,usually what happens is the metal contact between the round eye connector and the metal of the head or body corrodes a little and resistance goes up and leads to electrical issues and even causing the engine to majorly rust so with grounds what I like to do is remove the bolt ,,,,,,clean the mating metal parts then tap the hole to a larger size bolt that will stay tight longer and possibly prevent some of the ground issues .
