Knock sensor? Sudden loss in power and random valve tap - Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum
Ford Focus Forum
HomeContact UsAbout UsGalleryDiscussion ForumsMarketplace


Go Back   Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum > Ford Focus Tech Discussions > General Forced Induction

General Forced Induction The place to chat about turbochargers, superchargers nitrous systems and custom engine fabrications.

Search This Forum | Image Search | Advanced Search    
FocusFest FocusFanatics Merchandise

Reply




 
LinkBack Thread Tools Display Modes
Old 07-08-2010, 05:03 PM   #1
Focus Enthusiast
 
pattywaggon's Avatar
 
Join Date: Sep 2009
Fan#: 69125
Location: Levittown, PA
What I Drive: 03 yellow ZX3 2.0L Zetec

Posts: 321
FF Reputation: 0 pattywaggon Newbie
Buy-Sell-Trade Rating: (1)
Knock sensor? Sudden loss in power and random valve tap

--------------------------------------------------------------------------------

Im currently running a turbo at 6psi with spikes of 7 and tuned. The car runs really good.
Sometimes at WOT mostly 1st gear and sometimes 2nd i get a sudden jolt like a loss in power. I understand that the knock sensor can cut the fuel to save damage to your engine. Like i get a sudden jolt and then it runs fine.
The turbo has been on for a few weeks

I read up on some diagnoses to try and locate the problem.
I dont seam to hear any knocking and such.
Is there a way to eliminate this problem such as rebuilding the engine and running a lower compression?

Id rather build an engine now so i can run more boost then later on have to buy one because I destroyed mine somehow.

I stopped beating on the car and i dont hear the valve tap, it occurs after reving or WOT. I would hear it at idle.

Give me some pointers and ill try to find out where the noise is coming from and at which rpms and such.

Thanks.


__________________
BEWSTING ALL DAY
SELLING:
FACTORY 03 SUBWOOFER AMP $15
FACTORY 03 HEADLIGHTS W/ ZENON BULBS 30$
FACTORY 03 SPEAKERS $10 FOR 2
pattywaggon is offline  
    Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 07-08-2010, 05:15 PM   #2
The Librarian
 
WD40's Avatar
 
Join Date: Mar 2004
Fan#: 5157
Location: Helena, MT
What I Drive: '04 Sonic Blue - SVT 3Door

Posts: 13,116
FF Reputation: 138 WD40 Excellent Standing Member WD40 Excellent Standing Member
Buy-Sell-Trade Rating: (3)
Um...I edited your title.
You left out a very important "n" from knock , and I didn't want the thread to get reported. LOL!
WD40 is offline  
    Reply With Quote Quick reply to this message
Old 07-08-2010, 06:49 PM   #3
Focus Fanatic
 
bmylez's Avatar
 
Join Date: Apr 2009
Fan#: 64637
Location: San Antonio, TX
What I Drive: 2003 350Z Track

Posts: 3,450
FF Reputation: 23 bmylez Great Standing Member
Buy-Sell-Trade Rating: (1)
Knock sensor doesn't cut fuel, it cuts spark.

What are your plugs gapped at? How old is your coil pack and how old are your plug wires?

Does Tom know about this?
__________________
1992 Eagle Talon TSi - sold (POS)
2002 Mustang GT - sold
2002 SVTF - sold
2008.5 Mazdaspeed3 GT - cursed
2003 350Z Track - basically stock, and it runs
bmylez is offline  
    Reply With Quote Quick reply to this message
Old 07-09-2010, 07:30 AM   #4
Focus Addict
 
JeepXJ's Avatar
 
Join Date: Jun 2007
Fan#: 48404
Location: Joplin, MO
What I Drive: 03 Pitch Black SVTF

Posts: 754
Points 3,096, Level 34
Points: 3,096, Level: 34 Points: 3,096, Level: 34 Points: 3,096, Level: 34
Level Up 31% Completed
Level up: 31% Level up: 31% Level up: 31%
Forum Activity 2%
Activity: 2% Activity: 2% Activity: 2%
FF Reputation: 2 JeepXJ Good Standing Member
Buy-Sell-Trade Rating: (6)
Does it happen only in first gear?
__________________
CFM 67mm TB w/ port matched manifold, Volant Intake w/ ram air scoop, FS UDP, Toms Tune, CFM Adjustable Short Throw Shifter, MSD Coil & Wires
linux user
JeepXJ is offline  
    Reply With Quote Quick reply to this message
Old 07-09-2010, 10:10 AM   #5
FocusXtreme
 
badass3's Avatar
 
Join Date: Mar 2008
Fan#: 54096
Location: Louisville, KY
What I Drive: 2001, Pitch Black, ZX3

Posts: 3,369
FF Reputation: 7 badass3 Good Standing Member
Buy-Sell-Trade Rating: (17)
talk to tom and he will tell u to data log so just do it ahead of time. he will then do majic and figure out ur problem lol
__________________
Hatch Nation #24
Zetec Crew #270 ATXF #49
badass3 is offline  
    Reply With Quote Quick reply to this message
Old 07-09-2010, 10:26 AM   #6
FF Affiliate
 
1turbofocus's Avatar
 
Join Date: Oct 2003
Fan#: 1123
Location: Belmont, NC
What I Drive: 2000 ZX3 / 2002 SVT Turbocharged

Posts: 22,784
Points 52,929, Level 100
Points: 52,929, Level: 100 Points: 52,929, Level: 100 Points: 52,929, Level: 100
Level Up 0% Completed
Level up: 0% Level up: 0% Level up: 0%
Forum Activity 45%
Activity: 45% Activity: 45% Activity: 45%
FF Reputation: 154 1turbofocus Excellent Standing Member 1turbofocus Excellent Standing Member
Buy-Sell-Trade Rating: (28)
He knows I need a datalog but havent got anything from him yet , Hard to put names with screen names but not sure if I tuned this Focus , I think he did it local

Tom
__________________
Focus-Power: Your #1 Source for Ford Focus Speed, Tuning & Performance!

Customer Support
AIM: hpdyno
Email: hpdyno@aol.com
Phone: 704-249-3745
Site: focus-power.com

Elder 1turbofocus
1turbofocus is offline  
    Reply With Quote Quick reply to this message
Old 07-09-2010, 10:44 AM   #7
Focus Enthusiast
 
pattywaggon's Avatar
 
Join Date: Sep 2009
Fan#: 69125
Location: Levittown, PA
What I Drive: 03 yellow ZX3 2.0L Zetec

Posts: 321
FF Reputation: 0 pattywaggon Newbie
Buy-Sell-Trade Rating: (1)
thanks for the edit man,
i have motorcraft wires and my spark plugs are like 300 miles old.
there some good brand my dyno shop got me.
i got my car tuned locally, it runs good at certain times.
it can do it in any gear but tends to do it more so in a lower gear.

I havent had it happen in a week or so becuase I dont need the valve tap to progress
__________________
BEWSTING ALL DAY
SELLING:
FACTORY 03 SUBWOOFER AMP $15
FACTORY 03 HEADLIGHTS W/ ZENON BULBS 30$
FACTORY 03 SPEAKERS $10 FOR 2
pattywaggon is offline  
    Reply With Quote Quick reply to this message
Old 07-09-2010, 10:46 AM   #8
Focus Enthusiast
 
pattywaggon's Avatar
 
Join Date: Sep 2009
Fan#: 69125
Location: Levittown, PA
What I Drive: 03 yellow ZX3 2.0L Zetec

Posts: 321
FF Reputation: 0 pattywaggon Newbie
Buy-Sell-Trade Rating: (1)
I dont know how old my coil pack and wires are.
They were on when I had the car but im sure that they are old.
How would i fix the valve tap, Like cant you adjust the gap with the springs and such.
I have seen my buddy do this at his shop on a few hondas
__________________
BEWSTING ALL DAY
SELLING:
FACTORY 03 SUBWOOFER AMP $15
FACTORY 03 HEADLIGHTS W/ ZENON BULBS 30$
FACTORY 03 SPEAKERS $10 FOR 2
pattywaggon is offline  
    Reply With Quote Quick reply to this message
Old 07-09-2010, 05:43 PM   #9
Focus Fanatic
 
bmylez's Avatar
 
Join Date: Apr 2009
Fan#: 64637
Location: San Antonio, TX
What I Drive: 2003 350Z Track

Posts: 3,450
FF Reputation: 23 bmylez Great Standing Member
Buy-Sell-Trade Rating: (1)
Adjust the gap with the who-sie-what-sies??? Not even close to possible, man.

You haven't presented any hard evidence to point to actual valve train lash. If you are getting valve lash, I'm not sure why. We don't have hydraulic lifters that can wear out. We have solid buckets. If your valve springs are making noise, they need to be replaced, not "gapped" or something.
__________________
1992 Eagle Talon TSi - sold (POS)
2002 Mustang GT - sold
2002 SVTF - sold
2008.5 Mazdaspeed3 GT - cursed
2003 350Z Track - basically stock, and it runs
bmylez is offline  
    Reply With Quote Quick reply to this message
Old 07-09-2010, 08:13 PM   #10
Focus Enthusiast
 
pattywaggon's Avatar
 
Join Date: Sep 2009
Fan#: 69125
Location: Levittown, PA
What I Drive: 03 yellow ZX3 2.0L Zetec

Posts: 321
FF Reputation: 0 pattywaggon Newbie
Buy-Sell-Trade Rating: (1)
they only made noises once or twice,
what is the recommended spark plug gap?
I made 165whp 192wtq at 6psi

My wires and coil pack are stock,
the odd loss in power, could it be a sudden not spark or something?

I will try to get a datalog asap
__________________
BEWSTING ALL DAY
SELLING:
FACTORY 03 SUBWOOFER AMP $15
FACTORY 03 HEADLIGHTS W/ ZENON BULBS 30$
FACTORY 03 SPEAKERS $10 FOR 2
pattywaggon is offline  
    Reply With Quote Quick reply to this message
Reply

Bookmarks & Social Networks

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may 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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 11:28 PM.


Copyright 2002-2015 FocusFanatics.com. All Rights Reserved : Privacy Policy : Advertise Information

Focus Fanatics Ford Focus Forum offers many fun ways for you to engage with other Ford Focus Owners from across the world. Whether it be about the aftermarket performance modifications, technical how-to's, European tuned suspension or awesome fuel economy similar to the Mazda CX-3, Audi S3, Mazda MX-5 Miata and Acura TLX. You can find all Ford Focus, Focus ST and Focus RS related information here. Join our Ford Focus discussion forums and chat with local Focus enthusiasts in your area. If you own other makes have a look at Challenger Hellcat Forum, Charger Hellcat Forum, Cadillac ATS-V Forum, Cadillac CTS-V Forum, Lexus RC-F Forum, Lexus GS-F Forum, Mercedes GLA Forum, Mercedes GLE Forum and Volvo XC90 Forum.





Search Engine Optimization by vBSEO 3.6.1