W245 B1700 petrol 2005/6 cylinder misfire

2976 Views 22 Replies 4 Participants Last post by Bnut, Jul 27, 2020

Bnut

Discussion Starter · Jul 7, 2020

Hello folks,

This is w245 B1700 petrol 2005/6 with no history, basic runaround.

Cylinder four has a miss determined by pulling HT, removed plug - gap looks huge at 1.1mm although OEM plugs are set to 0,9m which I assume is just under 1mm, not 100% sure as separated by a comma, perhaps denoting something different?

If someone could confirm correct electrode gap that would be great, ordered a set of Bosch which should be here tomorrow.

The coil packs which feed 3/4 has two coils, are these independent of each other, i.e could one coil fail (out of the two) leaving the other working fine?

Complete newbie on this stuff as owned a S124 dinosaur for an age

Thanks for any pointers.

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DEVOURS

· #4 · Jul 8, 2020

Whenever I've received new spark plugs, they arrived with the correct gap for my B200. Gap is ~ 0.038 " ..Bosch #BKR6EZB or NGK plugs (different #) as standard dealer replacements..
Others here might change that gap up or down a touch..

I think that all cats are "superhot" under normal operation..and I've never tested the temp to know what the normal range is so I can't add any info on it.

Could you better explain what we are looking at in the 1st photo..with the shiny grayish box with a hole showing..?.

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DEVOURS

· #6 · Jul 8, 2020

Yes indeed. ..and thanks for explaining and now I get a view of the size of the part from pic #1 above.

If you have those rubber hangers burning,..then you definitely have way too much heat. Probably a sure sign of a serious cat problem and possible blocked..
Not safe to drive anywhere with that burning..

I can't help as I've been problem free with my B.

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DEVOURS

· #12 · Jul 11, 2020

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Bnut...

Thanks again...very informative !...and Bert Rowe has also been very helpful for us over the past many years..

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DEVOURS

· #15 · Jul 15, 2020

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I've had my B since 2005 and no parts gone bad on it yet..no bulbs..or magnets etc..to report yet....One of these days item #1 will have to get me..but not yet..

The best way to be able to help one with a problem is to have had the experience and share the repair knowledge whenever possible. I've played with the brakes to clean them and that's about it.

..Oil and maintenance..

That's why some mechanics or working tecks can help us in many cases....as we often see now..

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DEVOURS

· #18 · Jul 19, 2020

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What I did years ago with fuel injectors on my Camry, is to soak them nose down in a very small container and in a strong solution of spray carb cleaner that's recommended when cleaning air flow flaps and external components. I also dripped the solution through the top opening and watched it flow through and exit the spray tip of the injector.. Did it a few times and kept the solution away from the coils or electrical injector parts..not knowing if it would possibly attack the plastics..etc.. Hand wiped the other metal visible injector parts to clean them again with the strong carb cleaner..our Canadian Tire auto parts store has many choices of carb cleaners..so for us here,..it's no brainer.. Can be found everywhere at all auto parts stores.

I had a complete spare engine ..so I could afford to play with some parts and see if all worked for the better...It certainly did..and all of them worked perfectly after that..You could watch the injector and see some grunge flow out with a few repeats.

I can't say if this would help you in your case..and I don't have answers to the other questions..

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