Sputtering after plug replacement...

dannydavi · 04-23-2007, 07:31 AM

Hey guys another noob who loves working on cars messed something up again

lol

I just got done replacing the cylinder head cover bolt gaskets and spark plugs. (lots of oil on plugs) well 5 of the 6 plugs cause one of the new plugs broke on me so i reused one of the old ones until i got back to the auto store to get another. What seems to be happening is misfiring. lots of sputterage going on. Everything before i replaced the plugs sunday ran fine, just wanted to get rid of all the oil buildup and what not. since it was only yesterday i havent had time to go mess with anything, and figured i should get some comments before i did anyways.

So i drove a lil over 100 miles with it this way. Seemed to be running fine at full speed, but during light acceleration i got sputtering. Heavy acceleration wasnt noticeabal either. I dont know if it is the mixture of the old and new plugs or perhaps i may have damaged the wires while taking them off. (for some reason they were really stuck, so i grabed some channel locks to take them out. Dont know if that's bad or not) I have a multimeter, so i believe there is a way to test the current going through or what not, i'll have to read up on that.

I didnt touch distributor or cams or anything so timing shouldnt be off any more than it may have been before the plug replacement. Am def willing to check and correct if suggestions point me there no doubt.. but i'm kinda leaning towards the plugs or wires.

So anyways guys I'll be able to do all the work to fix this(unless it's something really easy) this coming wednesday or thursday any friendly input is appreciated. Thanks in advance

more: at idle while in drive it shakes and sputters kinda bad, but while in neutral it seems to kinda mellow out with little rpm flex...

IHateHacks · 04-23-2007, 12:53 PM

Did you gap the plugs before you installed them? Did you even check the gap? Spark plug gap for non-turbo's is .043" (1.1mm), turbo's is .031" (.8mm). The Maximum electrode gap for non-turbo's is .051" (1.3mm), turbo's is .039" (1mm).

Why didn't you replace the wires while you were replacing the plugs? Channel locks?!? You most likely damaged them. I'd get a set of MSD or NGK wires.

Are you sure you didn't mix up the plug wires? I'd double check that also.

dannydavi · 04-23-2007, 05:23 PM

thanks for the input. wiring is correct for sure, gap i compared to old plugs and matched up perfectly(dont know what happened to my gap checker) so it could be the wires since i had to pinch them pretty hard to get them out... also i will check the gap properly.. i'll buy another gap tool.. i'll let you know how it goes.

IHateHacks · 04-24-2007, 01:44 AM

Just so you know, comparing plugs to check the gap is not possible. The human eye can not distinguish the difference between .008". Spark plug gap checking tools are .99cents at your favorite parts store.

What kind of plugs did you use? You better not say Autolite, Champion or Bosch platinum +4's.

dannydavi · 04-24-2007, 03:37 AM

i used NGK iridium IX. and yeah im going to grab a gap tool at wally for less than a buck, just didnt have one then. could the gap make it sputter that bad? i think they came .044, so assuming that they were to spec with the sale advertisement then that wouldnt be the problem, but im obviously going to check that now that there is a problem, unfortunate that i didnt before. I also just ordered NGK wires earlier today, paid for the two day, so i'll have those soon. the wires were def sparking though. i removed three that i could access with the throttle body on and they were sparking fine.... speaking of throttle body.. does that gasket inbetween it and the intake need RTV gasket sealer goo stuff? or just the gasket?

supramacist · 04-24-2007, 05:54 AM

You can't assume you are getting propper fire from all of the plugs without checking all 6.

I am using denso iridium u grooves. With MSD wires. They are not yet installed.

I think with you not checking the gap and a bad 1 or 2 wires you may get a sputter but if it's wires. You'll feel sluggish. Like you are really having to ride that gas pedal to make it go and or rpm decrease or slop in the rpm's.

Sorry. I probably should have just stayed quiet.

I think you will solve the problem with a gapper and new wires. May be time for a new rotor and dist. cap.

04-23-2007, 07:31 AM	#1
dannydavi 12psi boost Join Date: Mar 2007 Location: Sacramento, Ca Posts: 373	Sputtering after plug replacement... Hey guys another noob who loves working on cars messed something up again lol I just got done replacing the cylinder head cover bolt gaskets and spark plugs. (lots of oil on plugs) well 5 of the 6 plugs cause one of the new plugs broke on me so i reused one of the old ones until i got back to the auto store to get another. What seems to be happening is misfiring. lots of sputterage going on. Everything before i replaced the plugs sunday ran fine, just wanted to get rid of all the oil buildup and what not. since it was only yesterday i havent had time to go mess with anything, and figured i should get some comments before i did anyways. So i drove a lil over 100 miles with it this way. Seemed to be running fine at full speed, but during light acceleration i got sputtering. Heavy acceleration wasnt noticeabal either. I dont know if it is the mixture of the old and new plugs or perhaps i may have damaged the wires while taking them off. (for some reason they were really stuck, so i grabed some channel locks to take them out. Dont know if that's bad or not) I have a multimeter, so i believe there is a way to test the current going through or what not, i'll have to read up on that. I didnt touch distributor or cams or anything so timing shouldnt be off any more than it may have been before the plug replacement. Am def willing to check and correct if suggestions point me there no doubt.. but i'm kinda leaning towards the plugs or wires. So anyways guys I'll be able to do all the work to fix this(unless it's something really easy) this coming wednesday or thursday any friendly input is appreciated. Thanks in advance more: at idle while in drive it shakes and sputters kinda bad, but while in neutral it seems to kinda mellow out with little rpm flex... __________________ '86.5 Supra - A/T - N/A - JDM Useful Sites: ToyoDIY.com ToyotaPart.com MKIIITSRM Last edited by dannydavi; 04-24-2007 at 09:37 PM.

04-23-2007, 12:53 PM	#2
IHateHacks 20psi boost Join Date: May 2006 Location: New Haven/Hamden Posts: 793	Did you gap the plugs before you installed them? Did you even check the gap? Spark plug gap for non-turbo's is .043" (1.1mm), turbo's is .031" (.8mm). The Maximum electrode gap for non-turbo's is .051" (1.3mm), turbo's is .039" (1mm). Why didn't you replace the wires while you were replacing the plugs? Channel locks?!? You most likely damaged them. I'd get a set of MSD or NGK wires. Are you sure you didn't mix up the plug wires? I'd double check that also. Last edited by IHateHacks; 04-23-2007 at 12:55 PM.

04-23-2007, 05:23 PM	#3
dannydavi 12psi boost Join Date: Mar 2007 Location: Sacramento, Ca Posts: 373	thanks for the input. wiring is correct for sure, gap i compared to old plugs and matched up perfectly(dont know what happened to my gap checker) so it could be the wires since i had to pinch them pretty hard to get them out... also i will check the gap properly.. i'll buy another gap tool.. i'll let you know how it goes. __________________ '86.5 Supra - A/T - N/A - JDM Useful Sites: ToyoDIY.com ToyotaPart.com MKIIITSRM Last edited by dannydavi; 04-24-2007 at 09:38 PM.

04-24-2007, 03:37 AM	#5
dannydavi 12psi boost Join Date: Mar 2007 Location: Sacramento, Ca Posts: 373	i used NGK iridium IX. and yeah im going to grab a gap tool at wally for less than a buck, just didnt have one then. could the gap make it sputter that bad? i think they came .044, so assuming that they were to spec with the sale advertisement then that wouldnt be the problem, but im obviously going to check that now that there is a problem, unfortunate that i didnt before. I also just ordered NGK wires earlier today, paid for the two day, so i'll have those soon. the wires were def sparking though. i removed three that i could access with the throttle body on and they were sparking fine.... speaking of throttle body.. does that gasket inbetween it and the intake need RTV gasket sealer goo stuff? or just the gasket? __________________ '86.5 Supra - A/T - N/A - JDM Useful Sites: ToyoDIY.com ToyotaPart.com MKIIITSRM

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04-24-2007, 01:44 AM	#4
IHateHacks 20psi boost Join Date: May 2006 Location: New Haven/Hamden Posts: 793	Just so you know, comparing plugs to check the gap is not possible. The human eye can not distinguish the difference between .008". Spark plug gap checking tools are .99cents at your favorite parts store. What kind of plugs did you use? You better not say Autolite, Champion or Bosch platinum +4's.

04-24-2007, 05:54 AM	#6
supramacist 1000whp postwhore Join Date: Apr 2007 Location: Escape from the Prison Planet Posts: 1,356	You can't assume you are getting propper fire from all of the plugs without checking all 6. I am using denso iridium u grooves. With MSD wires. They are not yet installed. I think with you not checking the gap and a bad 1 or 2 wires you may get a sputter but if it's wires. You'll feel sluggish. Like you are really having to ride that gas pedal to make it go and or rpm decrease or slop in the rpm's. Sorry. I probably should have just stayed quiet. I think you will solve the problem with a gapper and new wires. May be time for a new rotor and dist. cap.