![]() SubGothius I have used both (hotter) NGK5 & (colder) NGK6 plugs in my G54B engine ~ the colder plug fouls black quickly causing poor running 'n very black tailpipe ~ the hotter plug runs ok and the tailpipe is very dark gray here in Hawaii traffic. 20, to notice any differences in how your truck ran with both? Has anyone experimented with different spark plug heat specs, or have any experience comparing heat ranges NGK 5 vs. I've also read that it's better to err on the side of running a too-cool plug than a too-hot one, as the latter can cause damage, whereas the former just takes longer to warm up to operating temperature and can reduce power and economy. Reading up on cracked insulators, I've read one cause can be running a plug that's too hot. I hadn't fiddled with anything else to explain that, so I'm suspecting a similar issue as before but haven't pulled the plugs yet, since this is my only operational vehicle atm, and I want to have a fresh set of plugs ready at hand first. Last week or so, it suddenly started doing the same thing, misfiring on cold starts that went away as it warmed up. I swapped back to an old set of plugs I had lying around, and it started up and ran smoothly ever since. That would explain the sudden misfiring, reckon the ceramic must have expanded with heat as it warmed up and sealed up the crack enough to eliminate the misfiring during my smog check. When I got home again, I decided to check the plugs and found one had a cracked insulator around the center electrode. Lo and behold it did, and passed the smog sniff (just barely) on the first try. My reason for going down this rabbit hole was that this past February when I went to take my truck in for its annual emissions test, it was suddenly misfiring when I started it up, but with fingers crossed I kept driving to the smog station anyway hoping the misfire was just a cold-start fluke that'd clear up by the time I got there. According to the chart, a Denso 16 should be a full step hotter than all the other plugs these vendors list for my truck.Ĭhecking the Haynes manual just added to my confusion they spec NGK 6 plugs for the 2.0L but NGK 5 plugs for the 2.6L, which latter would be equivalent to. On every major parts-vendor site when I look up parts for my specific year/make/model/engine, they all list various Denso plugs with a 16 heat range among the other Champion 9, NGK 6, and Bosch 7 plugs Denso's own corporate site only lists 16s for my truck as well. The key thing here is the numbers in the middle, representing the plugs' heat range all of those plugs have equivalent heat range specs according to the chart: Trivia: The R in any of those indicates a Resistor plug to suppress EM noise from the ignition interfering with the radio and any other electronics, and the -11/-U10/-S11 suffixes just indicate a gap size pre-set at the factory, so nevermind all that for now. NipponDenso W20EP-U10 or W20EPR-U10 or W20EPR-S11.Now, my truck's owner's manual specs the following plugs for both the 2.0L G63B and 2.6L G54B: Next, this page does a pretty good job illustrating and explaining what heat ranges mean and what they do: ![]() I'm shopping new spark plugs for my '87 Ram 50 with the 2.6L G54B engine, and noticed some odd discrepancies in the heat range specs depending on which reference I use.įirst, note this spark plug heat range cross-reference/conversion chart (all other charts I've seen have identical data):
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