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Author Topic: Spark plug health  (Read 1282 times)

Arizoni

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Re: Spark plug health
« Reply #30 on: June 19, 2013, 10:33:22 PM »
It's possible the 10 percent ethanol used in our fuel is contributing to the problem.
It certainly can and does cause other problems with other parts.

I've used Bosch spark plugs in the two Mercedes I've owned and they seemed to work fine, but they were the single electrode style.

I am surprised that you saw no difference when you used the NGK BPR6ES plug but as you say, your Bosch was working fine.

In my case, my new RE G5 was having misfires at idle speed and when just cruising at a steady 40-45 mph (65-73 kmph).  Changing to the NGK totally eliminated those issues.
Jim
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Re: Spark plug health
« Reply #31 on: June 19, 2013, 11:35:10 PM »
over the years we toyota mechanics have been pulling bosch plugs out of 22r/22re engines due to poor performance. people get them for cheap at the parts store and can't figure out why their "home tune-up " failed. as to the screw tips, the nd plugs we get from toyota don't come off. don't know why.
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Blairio

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Re: Spark plug health
« Reply #32 on: June 20, 2013, 12:08:59 PM »
I ran my electra EFI for about 1300 miles on the original Bosch plug.  The bike ran fine once warmed up, but was reluctant to idle from cold until the engine had run for a couple of minutes. I changed from the original Bosch to the recommended NGK, and the difference when idling was like night and day. It will tickover from cold without help, and the tickover is generally much more even.

The other thing I noticed was that the Bosch plug (twin electrode one) looked far older than a plug that has covered only 1300 miles should. I have taken spark plugs out of my car after 10,000 miles that look better than it. From now on it is NGKs for this Enfield.
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barenekd

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Re: Spark plug health
« Reply #33 on: June 20, 2013, 04:27:54 PM »
I changed my Bosch out at about 250 miles. The NGK was still good at 15,000 miles when I changed it because I had more. The idling was still uneven at first, but a lot better than the Bosch. It improved as the miles went on. It was a non issue after about 1500 miles.
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Royalista

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Re: Spark plug health
« Reply #34 on: June 21, 2013, 12:09:58 AM »
Thanks for the replies so far.

I'd like to know whether all who had issues with the Bosch plug run on ethanol added fuel (aka bio fuel i believe).
Eventually other suggestions for the malperformance.

I also understand that not allowing the engine to warm up as in start and ride off will cause erratic behaviour. It will then take longer than the regular 90 seconds for the ecu to get its bearings right, all the while running way too rich.
Although I cannot understand how this would lead to a different result in both plugs.

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heloego

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Re: Spark plug health
« Reply #35 on: June 21, 2013, 02:11:20 AM »
Most all the fuel in New Mexico is 10% ethanol.
I fill at a Chevron station, but there isn't a placard declaring the 10% dilution. It is well documented that the 10% dilution adversely affects power. The police here draw from their own reserve and refuse to add the ethanol because of that.

I changed out to a NGK plug just after the 300 mile service and there was a big improvement in idling and power.
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