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E36/7 Z3 (1996-2002)
E36/7 Z3 Roadster, Z3 coupe, Z3 M Roadster and Z3 M Coupe talk with our gurus here.

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  #1  
Old 04-11-2016, 09:15 AM
Paehah Paehah is offline
Paehah
Location: Oregon
 
Join Date: Apr 2016
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Mein Auto: 1997 Z3
Valve noise

I have a '97 Z3 with 2.8 liter. The valves are tapping at idle. I was told there is no adjustment for these system. If a complete valve job is needed, what is the best valve system replacement? Should I go with stock or is there a jump in technology that I can implement if this is a necessary repair?
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  #2  
Old 04-11-2016, 11:39 AM
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thekurgan thekurgan is offline
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Location: Sacramento, CA
 
Join Date: Jul 2007
Posts: 6,329
Mein Auto: S62B50 Powered
If it's just the hydraulic lifters that are worn, you might want to just replace those first. How is the oil pressure overall?
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  #3  
Old 04-11-2016, 03:35 PM
nfunk nfunk is offline
1998 BMW Z3 2.8L
Location: New Orleans
 
Join Date: Oct 2011
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Mein Auto: 1998 BMW Z3 2.8L
What is the mileage on the motor? Possibly it just might be a couple of sticky lifters. Possibly a compression check might determine if a valve isn't opening or closing.

How do you like the cold air intake? Any performance change?
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  #4  
Old 04-11-2016, 03:52 PM
rmtaylor51 rmtaylor51 is offline
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Location: Minnesota
 
Join Date: Apr 2014
Posts: 21
Mein Auto: 1997 BMW Z3
Cold Air Intake

I had the same air filter when I bought my 1997 2.8. Sounded good but pulls in the hot engine compartment air instead of cold air. I reinstalled the factory air cleaner system (which is a cold air intake) and it ran better and smoother.

Last edited by rmtaylor51; 04-11-2016 at 03:54 PM.
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  #5  
Old 04-11-2016, 07:02 PM
Paehah Paehah is offline
Paehah
Location: Oregon
 
Join Date: Apr 2016
Posts: 6
Mein Auto: 1997 Z3
Oil Pressure good, I will check into the lifters Thanks. The performance with the Cold Air Intake really showed when I added a compensation chip. Much better throttle response and about 3 more MPG
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  #6  
Old 04-11-2016, 07:04 PM
Paehah Paehah is offline
Paehah
Location: Oregon
 
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Mein Auto: 1997 Z3
Mileage at 139,000+, Compression test a great idea.
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  #7  
Old 04-11-2016, 07:06 PM
Paehah Paehah is offline
Paehah
Location: Oregon
 
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Mein Auto: 1997 Z3
The car runs great and very smooth. At idle , accelerating or just cruising
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  #8  
Old 04-11-2016, 07:50 PM
Blacklane Blacklane is offline
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Location: Springfield, Ohio, USA
 
Join Date: Jun 2011
Posts: 1,792
Mein Auto: 1998 Z3 Roadster
Are you sure you're not hearing a VANOS rattle? The fix for that is at the Biesan systems website. There are some YouTube videos that show and play the sound. At that age, it's time for VANOS seals anyway.

Last edited by Blacklane; 04-12-2016 at 03:43 AM.
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  #9  
Old 04-12-2016, 11:23 AM
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vintage42 vintage42 is online now
BMW CCA 1405
Location: Louisville, KY
 
Join Date: Jun 2007
Posts: 3,310
Mein Auto: 1997 BMW Z3 1.9 5MT
Quote:
Originally Posted by rmtaylor51 View Post
... pulls in the hot engine compartment air instead of cold air. I reinstalled the factory air cleaner system (which is a cold air intake) and it ran better and smoother.
I removed the factory cold air intake on my 1.9, for several reasons. It looped over the top of the radiator to the passenger side, interfered with access to the front of the engine, and was the most restrictive part of the intake system.
http://www.bimmerfest.com/forums/sho...ht=intake+duct

Removal left a hole in the side of the airbox right behind the radiator. The ScanGauge mounted on my console showed intake air temperature increased about 15F at speed, and over 30F when stuck in traffic on a hot day.

I noticed no change in the mileage or the way the engine ran. I think "cold air intakes" are mainly for marginal benefit in heat-soaked engine compartments where engines can use cooler air for max power in city acceleration spurts.

The ultimate cold air intake is a frigid winter day. Again, whether in my Z3 or the other cars, I really don't notice any difference.
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  #10  
Old 04-12-2016, 07:57 PM
Paehah Paehah is offline
Paehah
Location: Oregon
 
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Mein Auto: 1997 Z3
Thanks I will research that now
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  #11  
Old 04-12-2016, 07:58 PM
Paehah Paehah is offline
Paehah
Location: Oregon
 
Join Date: Apr 2016
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Mein Auto: 1997 Z3
You are right about the cold winter day! I am concerned that the valve noise is an issue that could be robbing horsepower.
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  #12  
Old 04-13-2016, 09:06 AM
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thekurgan thekurgan is offline
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Location: Sacramento, CA
 
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Quote:
Originally Posted by Paehah View Post
You are right about the cold winter day! I am concerned that the valve noise is an issue that could be robbing horsepower.
Only if they stay collapsed once the engine is warm, thereby reducing lift and beating up the seating surface. How was your oil pressure measured?
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2002 E39 M5 / TiAg / Tubi Rumore / E60 SSK / Blanton 3.45:1 7 disc 40/100% locking diff / NCS Coding / Coby Alcantara / StrongStrut STB

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2000 M52TU E36/7 Z3 Roadster Schwartz*3 / Rogue RSM / Rogue Trans Mounts

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