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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)

E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 01-27-2013, 08:19 PM
FLE39 FLE39 is offline
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knocking on 89 gas

Guys, I've been running 89 in my car since I bought it. Rattles somewhat depending on throttle. I have done just about every tune up item possible. Plugs, CCV system, O2's, cooling system, fuel filter, DISA valve. What else in gods name can be causing it? I thought the car has a Knock sensor and 89 under "normal" conditions would be ok. If I run 93 it goes away. I know the answer I'm going to get... run 91+. but a stock car like this under a watchful eye and in great shape should run on 89 w/out rattle. Is my Knock sensor bad? No CEL.
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  #2  
Old 01-27-2013, 08:31 PM
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Andreas540i Andreas540i is offline
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Mein Auto: 1997 BMW 540i
Its tuned to run 91+ by running 89 it will probably have knock. The guys at BMW know what their doing. They tuned it for 91+ because they can get more power from it. If you really MUST run 89, you could try calling dinan or another tuning company and get it tuned for 89. The cost for manufactured tunes from them are 300+, so if you are trying to save costs it will be cheaper to run 91 than to keep modding to try to get it to run 89. If you live in a place where 91 is not available, might still be cheaper to buy your own gas tank and have 91 delivered to your driveway.
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  #3  
Old 01-27-2013, 08:36 PM
edjack edjack is offline
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What does the gas cap say? There s/b a minimum octane listed.
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  #4  
Old 01-27-2013, 09:07 PM
FLE39 FLE39 is offline
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my boss doesn't like paying for 91. When I'm "persoanlly" driving 93. business 89. I've run my 335i on 89. no knock. I just don't romp it.
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  #5  
Old 01-27-2013, 09:46 PM
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champaign777 champaign777 is offline
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try kerosin
its cheaper
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  #6  
Old 01-27-2013, 09:58 PM
JasonSC540ia JasonSC540ia is offline
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Not sure what the I-6 comppresion ratio is but im assumming its around the same as the V-8's. With a 10:1 compression ratio you need to run Super unleaded, or add an octane booster/anti knock additive.
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  #7  
Old 01-28-2013, 06:12 AM
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tmvE39/E53/Z32 tmvE39/E53/Z32 is offline
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Pay for the difference when using it for business. It's your car after all. The difference should be about $5 ea tank.
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http://www.bimmerfest.com/forums/sho...d.php?t=791509
2000 Dinan S1 //M5 (my DD) 06 DINAN E53 4.8iS (wife's DD), 90 Straman Z32TT (my pride & joy ride)

Gone, but not forgotten: 01 E53 3.0i, 01 525i Sport, 03 DINAN 540i MSport and 91 Z32TwinTurbo
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  #8  
Old 01-28-2013, 06:21 AM
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DHoang DHoang is offline
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Something's wrong w/ your car if you can't run 87 oct. w/o it knocking.
My car runs perfectly fine on regular gas 87 oct.

i think you're right w/ suspecting that your knock sensor is not working right.
It's supposed to detect knock and send a signal to the computer so the computer can retard the ignition to prevent knocking.
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  #9  
Old 01-28-2013, 06:35 AM
FiveDriver FiveDriver is offline
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The difference in price per gallon around here is .20 cents, at most. On a 15 gallon fill-up -- that's $3. On top of a $50 transaction.

My car runs much better on Super. You might be able to get away with 89 octane in warmer weather, but is it worth it ?

I run Super and don't think twice about.
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  #10  
Old 01-28-2013, 07:24 AM
FLE39 FLE39 is offline
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I still think there is something wrong with the knock sensor on 89. 87, ok fine.. yeah. but 89? eh... something is not right.
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  #11  
Old 01-28-2013, 07:57 AM
JimLev JimLev is offline
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Have you tried different brands of fuel?
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  #12  
Old 01-28-2013, 08:02 AM
pshovest pshovest is offline
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Ditto. I run 89 in (3) e39's year round without any difficulty or any audible knocking.
Perhaps noises are VANOS or exhaust rattle.



Quote:
Originally Posted by DHoang View Post
Something's wrong w/ your car if you can't run 87 oct. w/o it knocking.
My car runs perfectly fine on regular gas 87 oct.

i think you're right w/ suspecting that your knock sensor is not working right.
It's supposed to detect knock and send a signal to the computer so the computer can retard the ignition to prevent knocking.
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  #13  
Old 01-28-2013, 08:15 AM
ninetyseven1 ninetyseven1 is offline
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Quote:
Originally Posted by FLE39 View Post
Guys, I've been running 89 in my car since I bought it. Rattles somewhat depending on throttle. I have done just about every tune up item possible. Plugs, CCV system, O2's, cooling system, fuel filter, DISA valve. What else in gods name can be causing it? I thought the car has a Knock sensor and 89 under "normal" conditions would be ok. If I run 93 it goes away. I know the answer I'm going to get... run 91+. but a stock car like this under a watchful eye and in great shape should run on 89 w/out rattle. Is my Knock sensor bad? No CEL.
When I had a vacuum leak, it made the car knock. Check all hoses. Mine was the hoses that came off of the MAF boot and went to the front of the intake. There are like 3 hoses there.
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  #14  
Old 01-28-2013, 08:16 AM
ninetyseven1 ninetyseven1 is offline
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Quote:
Originally Posted by FLE39 View Post
I still think there is something wrong with the knock sensor on 89. 87, ok fine.. yeah. but 89? eh... something is not right.
a bad MAF could cause this too.
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  #15  
Old 01-28-2013, 08:17 AM
ninetyseven1 ninetyseven1 is offline
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Quote:
Originally Posted by ninetyseven1 View Post
a bad MAF could cause this too.
Unplug the MAF and drive it and see if you still hear knocks. Keep in mind though that when coming to a stop your car could stall out with a disconnected MAF sensor. Also, your traction control will not function.
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  #16  
Old 01-28-2013, 08:20 AM
ninetyseven1 ninetyseven1 is offline
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Quote:
Originally Posted by ninetyseven1 View Post
Unplug the MAF and drive it and see if you still hear knocks. Keep in mind though that when coming to a stop your car could stall out with a disconnected MAF sensor. Also, your traction control will not function.
Also, the knock sensor wiring corrodes. I unplugged one of mine from the black electrical box on the intake and looked inside the connector. There are four small wires inside the actual connector plug. I had 2 wires that were touching! The actual plastic insulation around the wires just plain corroded off! You will have to split the rubber boot on the connector plug with a razor blade to see inside it. Just tape it back up with electrical tape. It's worth a shot.
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  #17  
Old 01-28-2013, 08:23 AM
FLE39 FLE39 is offline
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No vacuum leaks. I replaced all the vacuum hoses and MAF boots. I also spray carb cleaner around items with the engine idling (cold!) to verify. I need to look at the wiring going to the knock sensor. It's not VANOS noise... or exhaust. it's spark knock. I'm 100% sure. I know what it sounds like. I've been driving modified cars for 13yrs. Sounds the same in a V8 as it does in a TT Supra, as it dones in a junky Malibu. It's spark knock. But this new of a car (yes 2003 new) should adjust for 89 gas. Brands do not matter. I drive about 30-40k year. I get to try brands all over the Southeast. How many knock sensors does the M54 engine have? 1 or 2? Approx where is it?
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DD: 2003 530i 5spd manual sport package. Conti DWS's, Llumar ATR, White LED lighting. TLC on-going.

Garage queen: '07 335i Sedan, base pkg, 6spd Manual, Procede 3 V5 w/NLS, staggered 18" 313's w/Conti DWS's, OS Giken TCD LSD, VAC Street Diff Cover, Akebono Euro Pads, CDV Removed, Black BMW Grilles, Interior & Exterior white LED lighting, LUX Angel Eyes, Debadged, Llumar ATR Tint.

Last edited by FLE39; 01-28-2013 at 08:25 AM.
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  #18  
Old 01-28-2013, 09:05 AM
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manticore33 manticore33 is offline
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Why doesn't your boss do like most companies and reimburse you per mile? Ala, $.55/mile to cover your gas, insurance, vehicle maintenance, and wear.
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  #19  
Old 01-28-2013, 10:11 AM
FLE39 FLE39 is offline
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^I've done that too. It's a deal thing I have worked out. The car should run fine on 89 as long as I'm not romping it. my 335i does and it's TT. I need to at least make sure the knock sensor is good and the wiring is not shot.
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DD: 2003 530i 5spd manual sport package. Conti DWS's, Llumar ATR, White LED lighting. TLC on-going.

Garage queen: '07 335i Sedan, base pkg, 6spd Manual, Procede 3 V5 w/NLS, staggered 18" 313's w/Conti DWS's, OS Giken TCD LSD, VAC Street Diff Cover, Akebono Euro Pads, CDV Removed, Black BMW Grilles, Interior & Exterior white LED lighting, LUX Angel Eyes, Debadged, Llumar ATR Tint.
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  #20  
Old 01-28-2013, 02:53 PM
ninetyseven1 ninetyseven1 is offline
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Quote:
Originally Posted by FLE39 View Post
^I've done that too. It's a deal thing I have worked out. The car should run fine on 89 as long as I'm not romping it. my 335i does and it's TT. I need to at least make sure the knock sensor is good and the wiring is not shot.
check th knock sensor wiring,it's prob not maf wiring
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  #21  
Old 02-01-2013, 08:25 PM
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manticore33 manticore33 is offline
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Quote:
Originally Posted by FLE39 View Post
^I've done that too. It's a deal thing I have worked out. The car should run fine on 89 as long as I'm not romping it. my 335i does and it's TT. I need to at least make sure the knock sensor is good and the wiring is not shot.
I will never understand; especially on an FI car.
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