Go Back   986 Forum - The Community for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Boxster General Discussions

Post Reply
 
LinkBack Thread Tools Display Modes
Old 07-08-2012, 06:27 AM   #1
Registered User
 
Join Date: Jul 2012
Location: essex
Posts: 4
knocking from engine boxster s

hi all, i have a boxster s 3.2 2001, i have a knocking from the engine only when the temp is up, i think its the oil once it gets up to temp it thins out and then the knocking starts, im using 5w40 mobil 1, any ideas before i change to 10w40 oil? cheers

RICHARD X is offline   Reply With Quote
Old 07-08-2012, 08:28 AM   #2
Certified Boxster Addict
 
Join Date: Nov 2010
Location: Los Angeles
Posts: 7,669
Once the engine (and oil) is warm, a 5w40 oil should have more than enough viscosity to protect the engine (its not likely "thinning out" unless your engine temp is over 250). Changing to a 10w40 will not likely improve the viscosity (its 40 in both oils when warm).

The first thing that I would do is to have your front engine mount inspected, its probably worn out and making a knocking noise.
__________________
1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
thstone is offline   Reply With Quote
Old 07-08-2012, 09:07 AM   #3
Registered User
 
jaykay's Avatar
 
Join Date: Sep 2009
Location: toronto
Posts: 2,668
Detonation or ticking/valve train noise?
__________________
986 00S
jaykay is offline   Reply With Quote
Old 07-08-2012, 09:47 AM   #4
Registered User
 
Join Date: Jul 2012
Location: essex
Posts: 4
it only knocks when its up to temp and idleling, as soon as i put my foot down a bit it stops (when in motion there is no knocking)
RICHARD X is offline   Reply With Quote
Old 07-08-2012, 10:30 AM   #5
2 fast 4 U
 
Join Date: Aug 2010
Location: Canada Montreal
Posts: 176
Are you using at least 93 octane fuel. I once put in 91 octane in my Boxster by accident and I notice knocking at idle speed.
__________________
Drive it the way it's meant to be driven!
2000 Boxster S
redeye280z is offline   Reply With Quote
Old 07-08-2012, 10:49 AM   #6
Engine Surgeon
 
Join Date: Aug 2008
Location: Cleveland GA USA
Posts: 2,425
Is the knock most notable @2,700 RPM?
__________________
Jake Raby/www.flat6innovations.com
IMS Solution/ Faultless Tool Inventor
US Patent 8,992,089 &
US Patent 9,416,697
Developer of The IMS Retrofit Procedure- M96/ M97 Specialist
Jake Raby is offline   Reply With Quote
Old 07-08-2012, 10:56 PM   #7
Registered User
 
Join Date: Jul 2012
Location: essex
Posts: 4
no the knocking only sounds when its up to temp and idleling/tick-over, when i put my foot on the acc it stops, my thoughts are that the oil is thining out when temp is up and when i put my foot down more oil go in and stops the knocking,,
RICHARD X is offline   Reply With Quote
Old 07-08-2012, 11:51 PM   #8
Custom User Title Here
 
particlewave's Avatar
 
Join Date: Mar 2012
Location: Ft. Leonard Wood
Posts: 6,163
Garage
Detonation, valve, or crank? Should be able to tell from the sound and where its coming from. A "tick" is probably valve related, but hard to say. You should post some audio/video.

I seriously doubt that its the oil viscosity.
__________________
https://youtube.com/@UnwindTimeVintageWatchMuseum
particlewave is offline   Reply With Quote
Old 07-09-2012, 09:24 AM   #9
Certified Boxster Addict
 
Join Date: Nov 2010
Location: Los Angeles
Posts: 7,669
Does the knocking change if you press in the clutch?
__________________
1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
thstone is offline   Reply With Quote
Old 07-09-2012, 11:10 AM   #10
Registered User
 
Join Date: Jun 2007
Location: Maryland
Posts: 240
My engine knock turned out to be the water pump getting wobbly.
Wret is offline   Reply With Quote
Old 07-09-2012, 12:25 PM   #11
Registered User
 
jaykay's Avatar
 
Join Date: Sep 2009
Location: toronto
Posts: 2,668
A light tick at idle may be injector noise
__________________
986 00S

Last edited by jaykay; 07-09-2012 at 02:28 PM.
jaykay is offline   Reply With Quote
Old 07-09-2012, 12:48 PM   #12
Registered User
 
Join Date: Jul 2012
Location: Houston, Texas
Posts: 5
Quote:
Originally Posted by RICHARD X View Post
hi all, i have a boxster s 3.2 2001, i have a knocking from the engine only when the temp is up, i think its the oil once it gets up to temp it thins out and then the knocking starts, im using 5w40 mobil 1, any ideas before i change to 10w40 oil? cheers
Does it sound anything like this: Clicking sound from engine bay - 2006 Cayman S - YouTube
ChimpanZed is offline   Reply With Quote
Old 07-13-2012, 05:28 AM   #13
Registered User
 
Join Date: Jul 2012
Location: essex
Posts: 4
it does not sound like a light injector tick, more of a knock, only happens when on tick-over around 800rpm and when car is up to temp, when 1st start and cold it purrrrs like a cat!!, the car is an auto-tiptronic, if its a mechanical problem sureley it would happen when i 1st start the car and happen all the time,, im gonna change the oil to a higher viscosity to see what happens!!
RICHARD X is offline   Reply With Quote
Old 07-26-2012, 08:39 AM   #14
Registered User
 
Join Date: Jul 2012
Location: Puerto Vallarta
Posts: 4
knocking on the wall?

Is that sort of knocking on the wall behind seats? It's heard after 10 or 15 minutes of warming up, specially while going on non-so-flat roads, more intense when stepping up accel. pedal, so to say...

josefer is offline   Reply With Quote
Post Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -8. The time now is 11:15 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page