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Scion xA/xB 1st-Gen Drivetrain & Power Engine and transmission discussions...

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Old 03-29-2009, 07:38 PM   #121
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when i changed my plugs my OE's were gapped at .044 also
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Old 03-29-2009, 07:48 PM   #122
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In thinking about that, Johnny, I believe the engines are actually assembled at a different factory, then shipped to the "body" assembly factories for all the different models that used that same engine.

That makes me wonder if maybe when the xA/xB took off with more demand than was expected, a number of engines originally intended for the JDM were reassigned to the US market, and those that showed up in xA/xB models here with the wider JDM gaps were actually originally intended for their domestic market.

THAT makes me wonder of there were any other minor differences between the JDM and US versions of that engine. :D

Guess I need to try to dig up some specs for the bB or ist 1.5l engines, eh?
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Old 03-31-2009, 11:11 AM   #123
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Quote:
Originally Posted by frogbox
If you would like, if you happen to have an SG hooked up , send me , or post up what it says as to ING timing at idel and at cruise. And as many points as you wish. I am researching the differences of plug gap , and type to the timing. Any thing I find I will share, weither it proves or disproves my theory.
at idle the ign. hovers around 8 degrgee atdc... crusing speeds i haven't checked yet
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Old 03-31-2009, 01:39 PM   #124
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Sent you a list of a few other helpful things, oh yeah forgot to add rpm at cruise and idel.
Thanx
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Old 04-03-2009, 12:24 AM   #125
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Antone else want to send the info I need? Got a few , but need a few more to really get some stats.

thanx to those that have responded so far.
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Old 04-03-2009, 12:27 AM   #126
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Here's your initial report, Froggie, with the engine warmed up, at idle, transmission in neutral, HVAC off, lights off, sound system off, outside temp ~50F.

I'll do some other readings in the near future.

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Old 04-03-2009, 01:57 AM   #127
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Thanx Tomas . I am looking at some pretty interesting data. We all may be surprised at what I am learning and finding out.
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Old 04-04-2009, 09:10 PM   #128
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YouTube is currently processing a couple minutes of video showing Vanilla's SGII at cold start and cruise.

http://www.youtube.com/watch?v=J-sN0zA9h-0&fmt=18

These are average figures - I've seen both better and worse under very similar conditions.

I figured it was easier to show it this way instead of trying to explain verbally.

Enjoy!
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Old 04-04-2009, 11:10 PM   #129
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i've never seen my ign timing go btdc while running its always been atdc...
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Old 04-05-2009, 01:12 AM   #130
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It usually only goes negative (retard) when it's cold and going downhill - I live in very hilly country - my driveway drops about 120 feet in altitude to the street. Also keep in mind it's an automatic, not a manual transmission.
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Old 08-01-2012, 01:15 PM   #131
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So, I have a 2006 xB with 100,000 miles on it and decided it's time to change the plugs that came with it. I opened the hood and could not find the plugs, but a youtube video set me straight pretty quick.

And this thread gave me what I need to know. Looks like I can get the .044 irridiums and be good for another 100,000.

BTW, I blew a top coil on my 2001 Chrysler 300m at 120,000 miles with the original plugs. I think Thomas' comment about the large gap risking blowing coils is real.

Thanks for the info, guys!
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Old 02-28-2016, 09:32 PM   #132
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Quote:
Originally Posted by bB2NER View Post
Exactly right! Run the NGK Irridiums. Get the part number for the bB and not the xB. They come pregapped at .044. You will se better MPGs, smoother idle and more power. Also remember to reset youe ECU by pulling the fuse for 10 minutes after the plug install. Good luck and let us know how you like the results?
Hi BB2nr-I have a Scion Xb 2008 and 2009 both due for spark plug changes at 85K miles each. Can you recommend a name brand spark plug that I can install that will improve gas mileage more than the factory plugs that came with the Xb's we bought brand new? I think you referred to "bB" plug replacement but I'm not sure to what you referred, I am very disappointed with the gas mileage our Xb's get now with the factory plugs-thanks to you for any suggestion in this area.

Jay
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Old 09-24-2016, 10:23 PM   #133
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So.....I DID read the entire 7 pages. I had a 2006 automatic. it got 30 mpg on a 50 mile round trip work trip, 16 of which was freeway at 75-80 mph. Got that mileage all day long, and is now at the 106K mile mark. The plugs I pulled out of it at 80K were worn to something greater than .044, don't remember the number. The plugs we put in it (don't remember if they were platinum or iridium) were gapped narrower (probably .032?) and I remember gapping them at .044, likely because the first thread I encountered probably said ".044".

Through a lucky CL ad I lucked into another 2006, one owner, documentation, etc with leather, fog lights, the spoked aluminum wheels, etc. My buddy really liked the first one, we struck a deal, he took the old one I grabbed the other one.

This second one has been stuck at 24-25 mpg regardless of driving, a rough idle and way less throttle response than the first one. The original plugs I pulled out of this second one were worn to like .035, which A) led me to not question the setting of .032 on the new Iridiums, and B) lends credence to the idea that these cars might have come with two different plug gaps from the factory.

I just ordered the -11's, they'll be here Monday. I was going to pull these and regap them, but afraid of breaking one after reading this thread. Must have gotten lucky the last time. lol I'll let you know the outcome, though it sounds like I'm already the last one to know.
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Old 09-25-2016, 02:08 AM   #134
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I had the guys at Pep Boys check the gap when I bought my iridiums and they were off. I had them help me re-gap them but they seemed pretty rough. I'm not sure how much the tips can handle, but my car runs well.

I'm hoping new plugs will solve both the mpg and throttle issues. Nice find with one owner with documentation- I bought from someone similar. That will save you a lot of headache and anxiety over what has been done and what needs to be done.

How do you like the leather seats?
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Old 09-25-2016, 05:17 AM   #135
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They look great, original owner took very good care, I think they might have a little more bolster in them over the standard seats. Feels like it. Living in SoCal though, they're a pain in the butt, literally, when the sun shines on them! The leather wrapped steering wheel that goes with them is nice. The rim is much thicker, and you get the radio controls on the wheel.
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Old 06-28-2017, 07:18 PM   #136
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Why reset the ECU for a plug change??????????????
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