01-18-2013, 03:02 AM
|
#1
|
|
Member
|
|
Join Date: Nov 2012
Location: earf
Posts: 49
|
|
|
Member
Join Date: Nov 2012
Location: earf
Posts: 49
|
What do you gap your plugs at? I changed my oil, plugs and air filter and lost mpg
Hey -
I bought my 09 limited with 58,000 miles so at 60k I put in new NGK Iridums (dont remember the model, I got it off this site though) that came pre-gapped to .41-.42
My last 3 tanks on the new plugs my MPG has gone down 60 miles per tank....
Im thinking it has to be the gap. What do you gap at?
|
|
 Reply With Quote
|
|
01-18-2013, 03:28 AM
|
#2
|
 |
Elite Member
|
|
Join Date: Feb 2011
Location: Bend, OR
Posts: 9,902
|
|
|
Elite Member
Join Date: Feb 2011
Location: Bend, OR
Posts: 9,902
|
First off is it a V6 or V8? I also believe that information can be found in the Owner's Manual if I remember correctly.
I can't remember what the gap is for both engines off the top of my head though.
|
|
|
Reply With Quote
|
|
01-18-2013, 04:39 AM
|
#3
|
 |
Elite Member
|
|
Join Date: Sep 2005
Location: Oakland CA
Age: 36
Posts: 5,066
|
|
|
Elite Member
Join Date: Sep 2005
Location: Oakland CA
Age: 36
Posts: 5,066
|
most are pre gapped at .44, make sure to check each plug, i gap my denso at .39
__________________
Pioneer DEH-80PRS,Rockford Fosgate T600-2,Hertz ML 1650.3(2 pairs),T400-2,Hertz ML 280.3(2 pairs),T1000-1bdcp,(2)JL Audio 12W6v3, Mechman 240a HO Alternator, Dual Northstar 31m,Borla Dual Exhaust,AFE Magnumforce intake.Enkei WT-4 Michelin Defender LTX 275/55R20. retrofitted S2000 projectors,Philips 85122 White Vision,Morimoto 5Five Ballast.Diode Dynamics SS3 Yellow Fog Sport.2 pairs of Hella Supertones.Full led conversion on interior and exterior.HAWK Talon Rotors and LTS pads F+R,Stoptech stainless steel lines F+R.Bilstein 5100 @0.85, MOOG FJ Springs front,Bilstein B12 36-281824 rear .
|
|
|
Reply With Quote
|
|
01-18-2013, 06:02 AM
|
#4
|
 |
Senior Member
|
|
Join Date: Sep 2009
Location: Orange County, California
Posts: 1,250
|
|
|
Senior Member
Join Date: Sep 2009
Location: Orange County, California
Posts: 1,250
|
According to the Toyota manual you do not adjust the gap. They are already pregapped so just install them.
__________________
2009 Trail Edition - ICON lift, Total Chaos UCA, BF Goodrich Mud Terrain KM2 285/70/17's, SCS Stealth 6 Matte Gunmetal finish, K9 2.2m Roof Rack.
|
|
|
Reply With Quote
|
|
01-18-2013, 08:19 AM
|
#5
|
 |
Member
|
|
Join Date: Mar 2008
Location: USA
Posts: 318
|
|
|
Member
Join Date: Mar 2008
Location: USA
Posts: 318
|
At that mileage, maybe try cleaning the MAF (Mass Air Flow) sensor.
__________________
By the work one knows the worker. --fortune cookie.
|
|
|
Reply With Quote
|
|
01-18-2013, 08:55 AM
|
#6
|
 |
Member
|
|
Join Date: Oct 2007
Location: Kilingworth, CT
Age: 59
Posts: 614
|
|
|
Member
Join Date: Oct 2007
Location: Kilingworth, CT
Age: 59
Posts: 614
|
I've bought toyota plugs online and at dealer, some were definitely not gapped correctly, others were spot-on.
I've used the gaps spec in the manual, seems to be fine, no change to MPG.
__________________
 2019 TRD OffRoad - Fox w/Resi, 650lb Springs, JBA HD UCA, T12 Rear Springs w/DS 5mm Spacer, Odyssey 34R-PC1500T AGM w/Diode Upgrade and CTEK Monitor, NOCO battery charger wired to external port for shore power, Rago Hidden Winch Plate, Comeup Seal 9.5 RSI, RCI Sliders/ Skids, 285/70-17 Cooper AT3 XLT on Fuel Rims, Various LED upgrades, OE Engine Heater w/External Port, XenonDepot Low Beam HID & LED 3k Fogs, ScanGauge, Midland GMRS, Accessory Mount for iPad, mike and Inreach, iKamper Mini 3.0, Custom Kitchen/Cargo system, ARB 50Q, Goose Gear dual drawer, Wilco Solo Tire/Hilift/RotoPax Carrier.
|
|
|
Reply With Quote
|
|
01-18-2013, 09:34 AM
|
#7
|
 |
Member
|
|
Join Date: Nov 2012
Location: Houston, TX
Posts: 138
Real Name: Kris
|
|
|
Member
Join Date: Nov 2012
Location: Houston, TX
Posts: 138
Real Name: Kris
|
Quote:
Originally Posted by Greydog
I've bought toyota plugs online and at dealer, some were definitely not gapped correctly, others were spot-on.
I've used the gaps spec in the manual, seems to be fine, no change to MPG.
|
Yup!! There will be a few that are not gapped correctly so you need to make sure they are. I just changed mine last month and all are gapped @.41 and I used all Denso from the dealer. No effect in gas mileage.
__________________
2016 Trail Edition Premium
KF5UXO
Last edited by kris022; 01-18-2013 at 02:17 PM.
|
|
|
Reply With Quote
|
|
01-18-2013, 10:09 AM
|
#8
|
|
Senior Member
|
|
Join Date: Jun 2007
Location: New Hampshire
Age: 67
Posts: 1,833
|
|
|
Senior Member
Join Date: Jun 2007
Location: New Hampshire
Age: 67
Posts: 1,833
|
Quote:
|
According to the Toyota manual you do not adjust the gap. They are already pregapped so just install them.
|
That would be the first manual I've ever seen that said NOT to check the gap of plugs before you install them.
Plugs are regapped at the factory...but things happen during shipping. My last tuneup I did...2 of the 6 plugs were off a little.
|
|
|
Reply With Quote
|
|
01-18-2013, 10:50 AM
|
#9
|
 |
Member
|
|
Join Date: Jun 2011
Location: Albuquerque
Posts: 558
Real Name: Jesse
|
|
|
Member
Join Date: Jun 2011
Location: Albuquerque
Posts: 558
Real Name: Jesse
|
My mileage didn't change after i installed new plugs @ 60k miles. I bought plugs from the dealer and checked gap, they were fine out of the box. My gas light comes on at 370 miles.
__________________
_____________________________________________
2016 Trail-P Dobinsons 302/325 DK Chromoly, 285 kO2, C4, RCI, BD Squad Sport, XD Phillips HID's, Tint, Husky liners, Crestone Rack
2020 Gx460
2000 Limited 4X4 - OME 881/890- B&M 70264
Overland Bound #10926
|
|
|
Reply With Quote
|
|
01-18-2013, 11:23 AM
|
#10
|
|
Member
|
|
Join Date: Nov 2012
Location: earf
Posts: 49
|
|
|
Member
Join Date: Nov 2012
Location: earf
Posts: 49
|
Quote:
Originally Posted by BlackWorksInc
First off is it a V6 or V8? I also believe that information can be found in the Owner's Manual if I remember correctly.
I can't remember what the gap is for both engines off the top of my head though.
|
It's a V6 but I dont have a manual.
|
|
|
Reply With Quote
|
|
01-18-2013, 12:13 PM
|
#11
|
|
Member
|
|
Join Date: Jan 2012
Location: Rugby, ND
Posts: 80
|
|
|
Member
Join Date: Jan 2012
Location: Rugby, ND
Posts: 80
|
Quote:
Originally Posted by jizzam93
Yup!! There will be a few that are not gapped correctly so you need to make sure they are. I just changed mine last month and all are gapped @.39 and I used all Denso from the dealer. No effect in gas mileage.
|
Why do you gap smaller than what is spec? Just curious.
__________________
2004 SR5, V-8, 6000k HID in headlights and Fogs, HCF MIA, K&N drop in, Rear Cat Convertor missing, MagnaFlow muffler, ToyTec Ultimate, Light Racing UCAs, SpiderTrax, 255/85R16 Cooper St, AVIC-X930BT, XM Satellite and HAM Radio. Otherwise completely stock.....For now. This pulls one HELL of a homebuilt camping trailer! Details to come! 
|
|
|
Reply With Quote
|
|
01-18-2013, 12:23 PM
|
#12
|
|
Member
|
|
Join Date: Nov 2012
Location: earf
Posts: 49
|
|
|
Member
Join Date: Nov 2012
Location: earf
Posts: 49
|
Quote:
Originally Posted by luvmyt4r
Why do you gap smaller than what is spec? Just curious.
|
This is what they came gapped at, I didnt change them. I had read a few threads on here that they came pre-gapped and that .41 was about right. I checked them and they were all right around .41-.43 so I popped them in.
The older ones were gapped a little wider, I just didnt think it would effect MPG that much. Im getting ~340-350 per tank now.
Think I should pull them out and regap them to .44?
|
|
|
Reply With Quote
|
|
01-18-2013, 02:21 PM
|
#13
|
|
Member
|
|
Join Date: Nov 2012
Location: Houston, TX
Posts: 138
Real Name: Kris
|
|
|
Member
Join Date: Nov 2012
Location: Houston, TX
Posts: 138
Real Name: Kris
|
Quote:
Originally Posted by luvmyt4r
Why do you gap smaller than what is spec? Just curious.
|
Fixed. I was reading the post above me and for some reason I put the wrong gap. Good catch and sorry bout that.
My taco had the same engine and it was indeed .41.
__________________
2016 Trail Edition Premium
KF5UXO
|
|
|
Reply With Quote
|
|
01-19-2013, 02:03 AM
|
#14
|
|
Elite Member
|
|
Join Date: Feb 2011
Location: Bend, OR
Posts: 9,902
|
|
|
Elite Member
Join Date: Feb 2011
Location: Bend, OR
Posts: 9,902
|
Quote:
Originally Posted by MikeInNH
That would be the first manual I've ever seen that said NOT to check the gap of plugs before you install them.
Plugs are regapped at the factory...but things happen during shipping. My last tuneup I did...2 of the 6 plugs were off a little.
|
This is absolutely true, always double check the gap on plugs because they can get dropped, dinged, ect and the gap changed. Sometimes they even get misadjusted from the factory.
|
|
|
Reply With Quote
|
|
01-19-2013, 03:02 AM
|
#15
|
|
Member
|
|
Join Date: Jun 2012
Location: Kelowna BC Canada in a Igloo
Age: 40
Posts: 47
|
|
|
Member
Join Date: Jun 2012
Location: Kelowna BC Canada in a Igloo
Age: 40
Posts: 47
|
I always suggest checking the gap as well. I have seen some really really bad units go into vehicles because someone down the road dropped it and it landed just right to change the gap. I see a lot of boxed plugs come with the cardboard unit on them but they might have been bumped between here and there
Looking around I see the gap for most plugs is preset at .044. I haven't been able to get a service manual without it being a zip file so when I get it unzipped I will find out if I am right or wrong lol
|
|
|
Reply With Quote
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is On
|
|
|
|
Linear Mode
