Spark plugs
#1
Driver School Candidate
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So i have a question about the spark plugs, does anyone know the correct measurements of the plug arches so ik its not heating up to fast id like to keep the plugs as long as possible if anyone can help that would be great my direct snap is hmuhunterlacey you can message me there or on here, thanks very much
#2
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So i have a question about the spark plugs, does anyone know the correct measurements of the plug arches so ik its not heating up to fast id like to keep the plugs as long as possible if anyone can help that would be great my direct snap is hmuhunterlacey you can message me there or on here, thanks very much
Hope this helps.
Nick
#4
Instructor
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Are you asking about the spark plug gap? The recommended iridium plugs come gapped properly and do not need to be adjusted at all. Just drop them in. Denso SK20R11 is what I used for my recent tuneup. That is the factory recommended plug for the V8.
Hope this helps.
Nick
Hope this helps.
Nick
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#5
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So to the original poster this above is not necessarily the case. Always check your spark plug gap. There are no exceptions to this advice. You can not know that it was set correctly, or maybe got dropped in shipping, or any number of reasons the gap may not be set correctly. Google “spark plug gap Lexus sc400” and you should see 0.044”.
Nick
#6
Instructor
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Very few people have the means to check their gaps. They come gapped at 0.044. You should also check your tire pressure before every journey and probably re-torque your lug nuts every month. I think it’s an acceptable practice to install a plug which is pre-gapped without checking. If you’re building a race car, a slightly altered gap could mean all the difference. He won’t notice it going to Best Buy.
Nick
Nick
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#7
Driver School Candidate
Thread Starter
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So to the original poster this above is not necessarily the case. Always check your spark plug gap. There are no exceptions to this advice. You can not know that it was set correctly, or maybe got dropped in shipping, or any number of reasons the gap may not be set correctly. Google “spark plug gap Lexus sc400” and you should see 0.044”.
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LSNewbie (07-31-24)
#11
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I stand by it though. Drop the damn plugs in. People are often afraid to do the work themselves because of all the barriers. The likelihood of a plug which is pre-gapped, not being correct is very low. It happened to you, cool. I’ve done plugs on my cars three times. A 4 banger, a 6 and an 8 cylinder. So that’s 18 spark plugs across three cars, no issues whatsoever. I just don’t think you need to be paranoid about double checking Denso’s work. Do you check resistance of your plug wires before installing too? Leak test your oil filters? Give me a break.
I’m relatively new even though I’ve been a member for more than a decade. I try to stay in my lane. I ignored the comment, to this point. I don’t ever mind a differing opinion to my own, but suggesting I shut up and don’t give my opinion is beyond the pail for me. I won’t be censured by some self-righteous online arbiter of sound advice.
Respectfully,
Nick
#12
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I agree you should double check the spark plug gap even if they come pre gapped. The chances are low but ive seen cars with a rough idle caused by trusting the pre gap that was hell to diagnose
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LSNewbie (07-31-24)
#14
Instructor
iTrader: (1)
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There was a post similar to this on FB, and it brought to light that a lot of the higher end spark plugs are being counterfeited, and those counterfeit plugs are being sold on Ebay, Amazon, and have even made their way to RockAuto.
So it's a good idea nowadays to inspect your spark plugs and compare them to the warnings found on the NGK and Denso websites. The counterfeits are getting really good, but as long as you know what you are looking for, you can still save yourself some serious headaches.
Even Denso suggests that if your plugs look suspicious, you need to measure the gap.
So it's a good idea nowadays to inspect your spark plugs and compare them to the warnings found on the NGK and Denso websites. The counterfeits are getting really good, but as long as you know what you are looking for, you can still save yourself some serious headaches.
Even Denso suggests that if your plugs look suspicious, you need to measure the gap.
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#15
Advanced
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So, is everyone going to continue to replace spark plugs at 40,000 mile intervals in order to maintain emissions system warranty? That’s what Lexus says it’s for.
Pretty sure plugs on the V35 engine could go much longer like other modern day engines.
This seemed like $500 wasted. My car ran perfect before and after installing new plugs. The old plugs look just fine, like they most likely could go another 40,000 miles.
Guess we can change brake fluid and differential grease at 60,000 miles too.
Pretty sure plugs on the V35 engine could go much longer like other modern day engines.
This seemed like $500 wasted. My car ran perfect before and after installing new plugs. The old plugs look just fine, like they most likely could go another 40,000 miles.
Guess we can change brake fluid and differential grease at 60,000 miles too.
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