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MAF sensor issue

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Old Jan 26, 2025 | 11:48 AM
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Default MAF sensor issue

So I have a 2001 z06 that's far from stock ofcourse, but for some reason ever since I got it couple months back it also has a super rough idle and wants to die out all the time and sometimes does stall out, I changed the plugs and wires and that did nothing, so I saw that sometimes the maf sensor could cause this, so I disconnected it and the car fixed itself, no misfire and no rough idle, I bought a brand new delphi one and once again brought the rough idle and hesitation at 1700 rpm back, then I disconnected it and it fixed itself again, then once again plugged it back in and once again brought the issue back, im super confused and don't know what to do.
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Old Jan 26, 2025 | 12:04 PM
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Where did you buy this MAF sensor ??
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Old Jan 26, 2025 | 12:13 PM
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Originally Posted by C5 Diag
Where did you buy this MAF sensor ??
I work at advanced auto parts part time so I bought it here brand new off the shelf today, and installed it today during work
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Old Jan 26, 2025 | 01:20 PM
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Any codes?
Who tuned it?
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Old Jan 26, 2025 | 01:27 PM
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As was mentioned is this car tuned ???…if it is take it to a tuner…I don’t touch tuned cars as most diagnostic guys won’t either for driveability issues because I expect to see certain values with either my scan tool or scope.
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Old Jan 26, 2025 | 01:55 PM
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Originally Posted by C5 Diag
As was mentioned is this car tuned ???…if it is take it to a tuner…I don’t touch tuned cars as most diagnostic guys won’t either for driveability issues because I expect to see certain values with either my scan tool or scope.
honestly I'm not too sure because I usually take people's words with a grain of salt on facebook marketplace but the guy did say it was bored to 5.9 and tuned aswell, here's a picture of the engine bay aswell just so you know the bolt ons and everything.

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Old Jan 26, 2025 | 02:11 PM
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Originally Posted by TweakCity
honestly I'm not too sure because I usually take people's words with a grain of salt on facebook marketplace but the guy did say it was bored to 5.9 and tuned aswell, here's a picture of the engine bay aswell just so you know the bolt ons and everything.

A picture won’t help diagnosing it.
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Old Jan 26, 2025 | 02:26 PM
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Originally Posted by C5 Diag
A picture won’t help diagnosing it.
there's nothing else I can show you lol, the tune is unknown and I can't tear the engine apart to see if it's bored out or not
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Old Jan 26, 2025 | 02:43 PM
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Well, the guy told you a story, you can't bore out a LS1/LS6 5.7 block to get 5.9 liters.
Without knowing the particulars of the tuning, you are just shooting in the dark.
Find a tuning shop willing to hook it up and scan it to see if they can diagnose it.
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Old Jan 27, 2025 | 08:42 AM
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Originally Posted by TweakCity
honestly I'm not too sure because I usually take people's words with a grain of salt on facebook marketplace but the guy did say it was bored to 5.9 and tuned aswell, here's a picture of the engine bay aswell just so you know the bolt ons and everything.
There is a blast from the past. Is that a BBK ?
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Old Jan 27, 2025 | 11:03 AM
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There are a number of possibilities here... the symptom of running better with MAF unplugged suggests to me that there could be a vacuum leak.
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