Iridium Spark Plug
#31
sorry to bring up an old post, but i think i may have put the wrong plugs in.
I am having some tranny shudder and ruff idol after changing out my plugs.
I have a 2000' model and the majority of the spark plug guides show OE gap for this car at .044"? Is that not correct for this model?
Or, is it in fact .8mm (?inches)? I will check my owners manual this evening and see what it says.
I am having some tranny shudder and ruff idol after changing out my plugs.
I have a 2000' model and the majority of the spark plug guides show OE gap for this car at .044"? Is that not correct for this model?
Or, is it in fact .8mm (?inches)? I will check my owners manual this evening and see what it says.
#33
Driver School Candidate
Sorry for bringing up an old post. I just purchased NGK Iridium IX Plugs (.044") for my 96 LS, and looking at the manual it states to use a .043" gap
So are you guys saying I should use a .8mm gap instead of the 1.1 on a 96? I'm confused with the previous posts on this thread.
Also should I decrease the gap down .001 to match the manual specifications if my new plugs are .044? I'm new to working on cars. Thanks!
So are you guys saying I should use a .8mm gap instead of the 1.1 on a 96? I'm confused with the previous posts on this thread.
Also should I decrease the gap down .001 to match the manual specifications if my new plugs are .044? I'm new to working on cars. Thanks!
Last edited by jakob27990; 01-07-17 at 11:01 PM.
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UNCNOR (01-08-17)
#35
Pole Position
Denso spark plug gap chart
Denso is an OEM supplier to Toyota/Lexus
I located this Spark Plug Gap Chart on their website;
www.globaldenso.com/cgi-bin/global/plug/usa/4w/plug.cgi?name=LS400&filename=4w-37.txt&action=search
Earlier in this post it was suggested 1995 and 1996 LS400 require a shorter spark plug gap...
Anyone care to field this one?
I located this Spark Plug Gap Chart on their website;
www.globaldenso.com/cgi-bin/global/plug/usa/4w/plug.cgi?name=LS400&filename=4w-37.txt&action=search
Earlier in this post it was suggested 1995 and 1996 LS400 require a shorter spark plug gap...
Anyone care to field this one?
Last edited by YODAONE; 01-09-17 at 03:29 PM.
#36
Moderator
Toyota has changed the design in August 1996 to use spark plugs that have the gap of 1.0-1.1mm (0.0394-0.0433in)
Below is from a JDM manual. It indicates the limit 1.3mm (0.0512in).
Below is from a JDM manual. It indicates the limit 1.3mm (0.0512in).
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GH5T (01-09-17)
#37
The required gap depends on the compression ratio, air fuel ratio, coil voltage and spark plug temperature. A bigger gap can only make a bigger spark if there is enough voltage to cause a spark under all these conditions, so a bigger gap may create no spark at all under some conditions. But, if the gap is too small, the plug is easier to faul. So, you should follow the instructions and purchase proper temperature spark plugs and properly adjust the gap.
#38
Moderator
No. You should not adjust the gap in case of a plug for LS400.
http://www.globaldenso.com/en/produc...ium/qa_22.html
http://www.globaldenso.com/en/produc...ium/qa_22.html
#39
No. You should not adjust the gap in case of a plug for LS400.
http://www.globaldenso.com/en/produc...ium/qa_22.html
http://www.globaldenso.com/en/produc...ium/qa_22.html
It appears that one should not adjust the gap on iridium spark plugs, as this will damage them.
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