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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 06-29-2018, 05:13 PM   #1
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MAF sensor o-ring size

Does anybody know the size of the MAF sensor's o-ring? I can't seem to find it and none of the ones at Autozone seem to fit. Would really hate to buy a new MAF sensor for a rubber seal if I can avoid it, its like $230.

Hoping to pick one up at Home Depot, Lowe's, or someplace similar.
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Old 06-29-2018, 05:27 PM   #2
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H2.00 x 22
Buna Nitrile.
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Old 08-27-2018, 02:21 PM   #3
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H2.00 x 22
Buna Nitrile.
Sorry for my lack of understanding, what does the H stand for?

Having a hard time finding this, there are quite a few 22x2.5 on Amazon.
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Old 08-27-2018, 05:20 PM   #4
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Sorry for my lack of understanding, what does the H stand for?

Having a hard time finding this, there are quite a few 22x2.5 on Amazon.
Part number

Anything that fits the specs will work.

Buna-Nitrile
22 mm ID
26 mm OD
2 mm Width
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Old 08-28-2018, 08:54 AM   #5
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https://www.amazon.com/dp/B005RUR0F6/ref=biss_dp_t_asn
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Old 09-12-2018, 02:20 PM   #6
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Just tried some 75A Viton o-rings and they are significantly stiffer than OEM, so much so that I can tell the engine is stumbling when slowing down in neutral gear, suggesting that the MAF is leaking.

@CSG Mike any suggestion for shore rating? Internet says 70Ais most common but not sure what the OE is.
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Old 09-12-2018, 03:09 PM   #7
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Quote:
Originally Posted by 1Cor10:23 View Post
Just tried some 75A Viton o-rings and they are significantly stiffer than OEM, so much so that I can tell the engine is stumbling when slowing down in neutral gear, suggesting that the MAF is leaking.

@CSG Mike any suggestion for shore rating? Internet says 70Ais most common but not sure what the OE is.
I would make sure that o-ring stays in place while pushing the MAF sensor. MAF sensor should sit flush. Sometimes the o-ring does not stay in its groove while pushing the MAF sensor in place. You can also rub a dab of grease just to wet the o-ring for sealing it air-tight.
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Old 09-12-2018, 03:11 PM   #8
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I would make sure that o-ring stays in place while pushing the MAF sensor. MAF sensor should sit flush. Sometimes the o-ring does not stay in its groove while pushing the MAF sensor in place. You can also rub a dab of grease just to wet the o-ring for sealing it air-tight.
Yup, flush and using grease...
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Old 09-12-2018, 03:26 PM   #9
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Quote:
Originally Posted by 1Cor10:23 View Post
Just tried some 75A Viton o-rings and they are significantly stiffer than OEM, so much so that I can tell the engine is stumbling when slowing down in neutral gear, suggesting that the MAF is leaking.

@CSG Mike any suggestion for shore rating? Internet says 70Ais most common but not sure what the OE is.
Tape around it to check for a seal.

Still stumbling? u got other issues.
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Old 09-13-2018, 10:35 AM   #10
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Quote:
Originally Posted by 1Cor10:23 View Post
Just tried some 75A Viton o-rings and they are significantly stiffer than OEM, so much so that I can tell the engine is stumbling when slowing down in neutral gear, suggesting that the MAF is leaking.

@CSG Mike any suggestion for shore rating? Internet says 70Ais most common but not sure what the OE is.
Did you use an oiled air filter?
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Old 08-15-2023, 02:35 PM   #11
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Originally Posted by CSG Mike View Post
Part number

Anything that fits the specs will work.

Buna-Nitrile
22 mm ID
26 mm OD
2 mm Width
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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