# sr20 problem.
**URL:** https://forums.speedlife.net/t/sr20-problem/148612
**Category:** Canada Nissan Automotive
**Created:** [March 8, 2008, 11:08pm UTC](https://forums.speedlife.net/t/sr20-problem/148612 "2008-03-08T23:08:30Z")
**Posts on this page:** 10
**Page:** 1
### Author:  [@STOKSUX](https://forums.speedlife.net/u/STOKSUX)
#### Post date: [March 8, 2008, 11:08pm UTC](https://forums.speedlife.net/t/sr20-problem/148612/1 "2008-03-08T23:08:30Z")
So, we just put my car all back together and everything is hooked up and run right so i can tell. Start the car, runs great not even a hickup, idles awsome. Now however, as soon as i rev the car it is cutting out at 2500 rpm. It sounds like it hitting a rev limmiter? i don’t know what to try. nothing was changed, just disconected and re-conected. Any imput would be great.
thanks
brandon
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### Author:  [@Invalid\_Zero](https://forums.speedlife.net/u/Invalid_Zero)
#### Post date: [March 8, 2008, 11:21pm UTC](https://forums.speedlife.net/t/sr20-problem/148612/2 "2008-03-08T23:21:47Z")
Probably a MAF issue. Check your wiring, make sure the plug is in properly. Might also be a dead MAF.
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### Author:  [@STOKSUX](https://forums.speedlife.net/u/STOKSUX)
#### Post date: [March 8, 2008, 11:24pm UTC](https://forums.speedlife.net/t/sr20-problem/148612/3 "2008-03-08T23:24:32Z")
we checked the wiring and that part is right, can a maf just go dead from sitting? how can i check? if i install a q45 maf would i have to re-tune my ecu?
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### Author:  [@240DRIFTz](https://forums.speedlife.net/u/240DRIFTz)
#### Post date: [March 9, 2008, 10:14am UTC](https://forums.speedlife.net/t/sr20-problem/148612/4 "2008-03-09T10:14:45Z")
Yea you will need to tune…
If you plan on upgrading maf’s go with z32…
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### Author:  [@Garret\_Volden](https://forums.speedlife.net/u/Garret_Volden)
#### Post date: [March 9, 2008, 10:40am UTC](https://forums.speedlife.net/t/sr20-problem/148612/5 "2008-03-09T10:40:30Z")
why z32? whats wrong with q45?
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### Author:  [@dnl61](https://forums.speedlife.net/u/dnl61)
#### Post date: [March 9, 2008, 1:37pm UTC](https://forums.speedlife.net/t/sr20-problem/148612/6 "2008-03-09T13:37:24Z")
i believe that z32 MAF’s have a higher hp rating than a q45 but either is fine. yes you would need to re-tune the car if you install a different MAF.
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### Author:  [@RS13](https://forums.speedlife.net/u/RS13)
#### Post date: [March 9, 2008, 4:02pm UTC](https://forums.speedlife.net/t/sr20-problem/148612/7 "2008-03-09T16:02:19Z")
> [@dnl61](#):
>
> i believe that z32 MAF’s have a higher hp rating than a q45 but either is fine. yes you would need to re-tune the car if you install a different MAF.
Other way around. Q45 can measure more airflow but the resolution (airflow unit per change in voltage) is alot less, making the MAF have more uncertainty (error) making the tune harder. But they both work fine, as long as you set it up right
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### Author:  [@Tweak](https://forums.speedlife.net/u/Tweak)
#### Post date: [March 9, 2008, 5:17pm UTC](https://forums.speedlife.net/t/sr20-problem/148612/8 "2008-03-09T17:17:13Z")
i dont recommend installing a used MAF, have worked in a mechanic shop, i remember one problem in particular…the MAF. they have to be perfectly matched to the old MAF when it was working. if you can try and get on brand new…
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### Author:  [@Garret\_Volden](https://forums.speedlife.net/u/Garret_Volden)
#### Post date: [March 9, 2008, 8:39pm UTC](https://forums.speedlife.net/t/sr20-problem/148612/9 "2008-03-09T20:39:04Z")
yeah for around 500?
no thanx
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### Author:  [@STOKSUX](https://forums.speedlife.net/u/STOKSUX)
#### Post date: [March 10, 2008, 10:25pm UTC](https://forums.speedlife.net/t/sr20-problem/148612/10 "2008-03-10T22:25:12Z")
Any Ideas on how i check it? What order should the wires be in? i have another maf here, but it has 4 prongs on it ( A B C D ) were as the one that came out only has 3 ( A B C ) ?