ignition coil part numbers, which one is good?

[friendly_jacek]

After reading about all those coils failing, I decided to keep a few in stock just in case I get stranded or even replace the rear ones profilactically. The problem is I came across several Toyota part # that fit V6 RAV4:
90919-02251
90919-A2002
90919-A2004
90919-A2007
I don't know which number is for the defective ones and which for the revised ones. There was one thread here that mentioned 90919-02251 being bad and replaced by new part #, but someone on some other forum stated that 90919-02251 are the revised ones.

Any takes?

Edit: looks like the first number is the defective one according to this: P0356 Code plus 7 other codes - (Might be a bad coil.) --2006 V6 61,000 miles

Weird, the more I read, the more it looks like the coils #4 and #6 fail the most. Why would it be?

Edit 2: A2007 seams to be the most current part # according to http://www.toyotapartszone.com/2010/...park-plug.html

Interesting how Toyota went through quite a few different coils. Clearly quality problems in Chinese made parts.

Edit 3: there is also 90919-02255 according to http://www.toyotapartseast.com/parts...-ignition.html

This is my final edit, I promise.

[friendly_jacek]

Anyone with evidence that the A200x parts are actually improved over the original part?
I'm asking to determine if it's worth to prophylactically swap the old parts with new parts.
I fund a cheap source of A200x parts.

[friendly_jacek]

Hate to see how this thread turned to a monolog.

Oh, well.
The critical reading of the previous threads with accounts of coil failures in V6 engine gives the following failure count:

Cylinder# (# of failed coils)
1 (1)
2 (1)
3 (1)
4 (5)
5 (3)
6 (3)

Considering that cylinders are arranged:

1 3 5
2 4 6

the failures seem to concentrate at the right front corner.

Interesting, isn't it? Blast of hot air from radiator perhaps? Heat soak?

[JuneBug]

FJ, I for one appreciate the valuable info in your thread. There must be a lot of heat in that area of the engine compartment. That happens to be where the battery is located which is another item prone to failure.

[Carbon]

Cooler coolant enters near cylinder 1 and come out near cylinder 6, right? Hot coolant enters the radiator in front of cylinder 6 and the cooler side is in front of cylinder 2. So hotter air blows toward cylinder 6 too.

Nice job on the data compilation and interpretation.

[friendly_jacek]

I took delivery of the new coil. Here is the new coil (right) compared with the old coil that happened to be #90919-02251.





The most striking difference is a double metalic screen ouside the plastic housing in the new coil.




The old one seems to have a slight leak with small amount of reddish liquid between rubber boot and plastic. Unfortunately, I wiped most of it before taking a picture.



I read that VW had a huge problem with defective coils 2001-2003 and they all failed by loosing seals, especially in colder climate. Not sure if that holds true in Toyota's coils.

BTW, I decided to order more coils and replace them all. I came across a recommendation stating that if one coil fails all should be replaced as they tend to go out at similar times.

[JuneBug]

Originally Posted by friendly_jacek

I took delivery of the new coil. Here is the new coil (right) compared with the old coil that happened to be #90919-02251.

So, the old defective coil on the left is part number 90919-02251, and the new revised coil on the right is part number 90919-A2007? Just want to keep it straight.

[friendly_jacek]

Originally Posted by JuneBug

So, the old defective coil on the left is part number 90919-02251, and the new revised coil on the right is part number 90919-A2007? Just want to keep it straight.

Yes, the defective one is 90919-02251. And yes, the newest one is 90919-A2007. The one pictured is 90919-A2004 as I found a great deal on ebay on this one.

My research showed that amazon and auto parts sell a replacement that is identical to the defective 90919-02251 and is also known as Beck Arnley 178-8311. I would not buy this one, even though price is good at $40.

[RAV4Don]

Friendly_jacek, thanks for the research you did and posted. Sooner or later several of us will need to reference your information to replace a coil.

[Clayvis]

Found this post while researching coil part numbers. I have the new style coil pictured on the right in the above comparison picture, but the part # on it is 90919-0255. The box it came in also has part # 90919-A2007 on it as well as the 0255 part #. So I am guessing they are the same part.