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09-14-2012, 07:18 PM | #1 |
Private First Class
19
Rep 196
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surging at low rpms. Could VANOS be involved
Hi,
I find that when I'm driving around town, I give it some gas to accelerate moderately, which the car does. Suddenly, it develops way more power. This occurs at lower rpms, maybe 2 or 3000 rpm. I noticed this after installing the e46 M3 K&N cold air kit. I don't know if it's a coincidence that I noticed it after the install, and I'm not sure why this would cause problems. I mean, it's the same engine in both cars, so even though I'm using the M3 specific intake in the Z4, I'm not convinced that this could be the cause. Car has 20,000 miles on it, so I've got to do the valves soon. But I'm suddenly worried that the surge might be VANOS related. Anyone with a similar experience?
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09-14-2012, 08:38 PM | #2 |
M = Midlife Crisis
65
Rep 2,006
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Put the stock air box back on and see. Thought I read somewhere the K & N intake actually reduces performance on the S54?
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09-14-2012, 09:16 PM | #3 |
Dog Listener
703
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^WHS
And check the MAF. Sounds like something MAF related, but like Caddy said it's probably secondary to the airbox. It is the same engine, but different ECU, and other differences as well. |
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