spark plugs
01-18-11, 09:00 PM
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spark plugs
in the mix of completing my full tune up on the 400 and trying to figure out this random misfire when accelerating as many ppl are having this issue based on the countless threads i have read with no resolution to the problem.....so after timing belt, distributor caps and rotor buttons,driver side coil, cleaned maf. wires with new spark plugs and trying 12v mod problem was still there...so i spent my day going through sensors, wires, vacuum lines etc, i noticed a maintenance sticker inside the hood that says PLATINUM plugs to be used which is not what i bought when i replaced them and it still cost me $4 bucks a plug...so made a phone call got a deal on some bosch platinum's $20 bucks for all 8, gapped them to .44 dropped them in an wow this car is finally driving so nice accelerates with no issues idles nice and has all its power back in all ranges of the rpm......so to my 400 drivers who may still be having hesitation issues when driving platinum plugs gapped to factory specs .44 makes a night and day difference.....
01-18-11, 11:46 PM
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Do yourself a favor. NEVER RUN BOSCH plugs in Japanese cars. Your engine will love you for it. NGK OR DENSO ONLY !!!!!! SORRY just gotta hate on Bosch plugs. Never seen the reason behind them. Factory specs call for NGK / Denso usually.
BUT Yeah spark plug gap is very important.
BUT Yeah spark plug gap is very important.
01-19-11, 08:40 AM
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I was losing a lot of HP as well in my 95 SC 400. After replacing only 4 spark plugs I got a lot of it back. I bought them from Lexus for $10 each, probably paid a little extra but knowing that they are Toyota plugs is worth it.
01-19-11, 04:02 PM
#6
that the previous owner installed.
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01-30-11, 11:49 AM
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This is interesting. I just did the full tuneup and I installed NGK laser iridiums. Haveing the hesitation issue in lower RPM's. I have a TPS sensor on the way and this is after I have had everything else apart. IAC valve. EGR valve. Replaced ECT sensor. Have removed and carefully cleaned my MAF a couple times. Would suck if it is something as simple as plugs. Oh well wont hurt to have a new TPS sensor.
01-30-11, 12:05 PM
#13
Do yourself a favor. NEVER RUN BOSCH plugs in Japanese cars. Your engine will love you for it. NGK OR DENSO ONLY !!!!!! SORRY just gotta hate on Bosch plugs. Never seen the reason behind them. Factory specs call for NGK / Denso usually.
BUT Yeah spark plug gap is very important.
BUT Yeah spark plug gap is very important.
