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Partial plugged cat or something else

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Old 02-17-2013 | 04:08 PM
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I unplugged the maf and that changed nothing. Unplugged each injector individually, the engine stumbled when disconnected so they're all working. I temped all cylinders 2,4,6,8 I couldn't get a reading on as the machine only goes to 320. On 1,4,7 3-320 but on 3 it barely hit 200. In drive, I foot braked it and floored it and it barely makes it past 2000rpms.
Old 02-17-2013 | 04:52 PM
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Just checked the vacume and it's steady at 13 in/hg.
Old 02-17-2013 | 05:06 PM
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Vacuum leak, bad intake gaskets?
Old 02-17-2013 | 05:08 PM
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Originally Posted by AKlowriderZ71
Vacuum leak, bad intake gaskets?
Not sure about the leak, the guage says 13in/hg. I sprayed the whole engine with carb cleaner and didn't notice anything?
Old 02-17-2013 | 05:47 PM
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You have the 212/218 right? You should have at least 18" vacuum at idle.

Plent of times I've seen vacuum leaks at the lower part of the intake gaskets, where it's very difficult to spray parts cleaner. ESP if you still have the foam baffles under your intake. Sometimes only a smoke machine will show the vacuum leak.

How old are your intake gaskets, and how many times have they been reused? Are they green or red?
Old 02-17-2013 | 06:00 PM
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Originally Posted by AKlowriderZ71
You have the 212/218 right? You should have at least 18" vacuum at idle.

Plent of times I've seen vacuum leaks at the lower part of the intake gaskets, where it's very difficult to spray parts cleaner. ESP if you still have the foam baffles under your intake. Sometimes only a smoke machine will show the vacuum leak.

How old are your intake gaskets, and how many times have they been reused? Are they green or red?
I have a supercharger, don't know if that makes a difference on vacume at idle or not. The gaskets were done late 2011 or early 2012? Cant remember but they probably only got less than 7000kms? I want to say red. Can I get an inexpensive smoke bomb test for home use?
Old 02-19-2013 | 10:09 PM
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Here's a hptuners log from tonight. It's done in default metric.
Attached Files
File Type: hpl
feb19.hpl (150.4 KB, 52 views)
Old 02-19-2013 | 11:24 PM
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Originally Posted by tweeder
I have a supercharger, don't know if that makes a difference on vacume at idle or not.
No, it doesn't. You should still have very good vacuum at idle.

I don't know of any "home" type of smoke tester. Mine was pretty pricey, but it's an invaluable tool. Hell, just a bottle of fluid for the machine is $45.
Old 02-19-2013 | 11:26 PM
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B.C. isn't THAT far away from Alaska.......

Make the drive up here, and I'll smoke test it for you. Hell, I'll even buy the beer since you had to drive.
Old 02-20-2013 | 06:42 PM
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Originally Posted by AKlowriderZ71
B.C. isn't THAT far away from Alaska.......

Make the drive up here, and I'll smoke test it for you. Hell, I'll even buy the beer since you had to drive.
Over to your side it is. It's a 3hr drive to hyder from here


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