The Random E46/ZHP Question Thread

My MPG needle has gotten really wonky in the past 36 hours, and I'm hoping someone can tell me if it's indicative of an underlying issue?

It'll sit at 50mpg until about 5mph, and then spike over to 12mpg really fast. When I come to a stop, it'll die back to 50mpg as I'm coasting (under 10mph). Then it'll raise to, and sit at, 30mpg while at a dead stop.

@L0veZHP this thing?

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

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Originally Posted by 704sw

My MPG needle has gotten really wonky in the past 36 hours, and I'm hoping someone can tell me if it's indicative of an underlying issue?

It'll sit at 50mpg until about 5mph, and then spike over to 12mpg really fast. When I come to a stop, it'll die back to 50mpg as I'm coasting (under 10mph). Then it'll raise to, and sit at, 30mpg while at a dead stop.

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My MPG needle basically does the bolded part. Not the idling part though.

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Originally Posted by 704sw

My MPG needle has gotten really wonky in the past 36 hours, and I'm hoping someone can tell me if it's indicative of an underlying issue?

It'll sit at 50mpg until about 5mph, and then spike over to 12mpg really fast. When I come to a stop, it'll die back to 50mpg as I'm coasting (under 10mph). Then it'll raise to, and sit at, 30mpg while at a dead stop.

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I think that's pretty much normal. I remember mine doing that when I had the ZHP cluster in it, even when I first got it at 44k

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Originally Posted by 704sw

My MPG needle has gotten really wonky in the past 36 hours, and I'm hoping someone can tell me if it's indicative of an underlying issue?

It'll sit at 50mpg until about 5mph, and then spike over to 12mpg really fast. When I come to a stop, it'll die back to 50mpg as I'm coasting (under 10mph). Then it'll raise to, and sit at, 30mpg while at a dead stop.

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Everything seems normal except to me the 30mpg at dead stop bit. So it shows 30mpg when ur idling?


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Originally Posted by BMWCurves

My MPG needle basically does the bolded part. Not the idling part though.

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Originally Posted by Sockethead

I think that's pretty much normal. I remember mine doing that when I had the ZHP cluster in it, even when I first got it at 44k

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Rob and William: I wouldn't be too concerned had it not just started doing this. I noticed it at the top of the exit ramp after a 360 mile drive roundtrip. I haven't tried disconnecting the battery to reset it yet.

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Originally Posted by san

Everything seems normal except to me the 30mpg at dead stop bit. So it shows 30mpg when ur idling?

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Yep. I've read some posts on the E39 and M52 E46s where people say it could be a vacuum leak, or it could be indicative of a fuel pump problem. The car is running fine, which is what's throwing me for a loop. Fuel consumption to and from Raleigh this weekend seemed normal.

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Originally Posted by 704sw

Rob and William: I wouldn't be too concerned had it not just started doing this. I noticed it at the top of the exit ramp after a 360 mile drive roundtrip. I haven't tried disconnecting the battery to reset it yet.

Yep. I've read some posts on the E39 and M52 E46s where people say it could be a vacuum leak, or it could be indicative of a fuel pump problem. The car is running fine, which is what's throwing me for a loop. Fuel consumption to and from Raleigh this weekend seemed normal.

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Older BMWs worked on a vacuum AFAIK, but I remember Terra saying somewhere that the E46 fuel economy gauge is a calculated value based on injector pulse width (how long an injector sprays) and current speed, and possibly other values

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Originally Posted by Sockethead

I think that's pretty much normal. I remember mine doing that when I had the ZHP cluster in it, even when I first got it at 44k

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It is not supposed to sit at 30mpg when at a dead stop. It'll sit somewhere around it or slightly higher when coasting in neutral if at really low speeds, but it shouldn't be there at a dead stop.


Try a battery reset... disconnect for 15 minutes and plug back in, see if that helps.

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Originally Posted by az3579

It is not supposed to sit at 30mpg when at a dead stop. It'll sit somewhere around it or slightly higher when coasting in neutral if at really low speeds, but it shouldn't be there at a dead stop.


Try a battery reset... disconnect for 15 minutes and plug back in, see if that helps.

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Yea sorry guys, I was referring to the needle spiking up, I missed the 30mpg part

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Originally Posted by BMWCurves

@L0veZHP this thing?

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

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Yeah I think it’s that one thanks man


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