Dodgy idle & low rpm hesitation - Page 3 - S2KI Honda S2000 Forums

Notices
UK & Ireland S2000 Community Discussions related to the S2000, its ownership and enthusiasm for it in the UK and Ireland. Including FAQs, and technical questions.

Dodgy idle & low rpm hesitation

Reply

Old 06-29-2017, 07:03 AM
  #21
 
nomadicS2k's Avatar
 
Join Date: Sep 2007
Location: Haywards Heath
Posts: 2,874
Thanked 10 Times in 10 Posts
Default

Vac leaks I think will be harder than the IACV - unless you have some top tips to share!
nomadicS2k is offline  
Reply With Quote
Old 06-30-2017, 03:59 AM
  #22
Thread Starter
 
Join Date: Nov 2009
Location: Banbury, Oxfordshire
Posts: 628
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Originally Posted by nomadicS2k View Post
Vac leaks I think will be harder than the IACV - unless you have some top tips to share!
Well i've got loads of silicone vac hose left from my Noble so will maybe replace a few bits and see how I get on.

Technically spraying carb cleaner should tell me if there's a leak iirc (ie spray it over vac hoses and if the revs increase it's got a hole around there)
GhostWKD is offline  
Reply With Quote
Old 06-30-2017, 04:35 AM
  #23
 
Join Date: Nov 2013
Location: Norfolk
Posts: 2,251
Thanked 10 Times in 10 Posts
Default

Could use a vacuum testing tool
noodels is offline  
Reply With Quote
Old 06-30-2017, 10:02 AM
  #24
 
BenRNBP's Avatar
 
Join Date: Jul 2012
Location: South Coast
Posts: 3,230
Thanked 8 Times in 8 Posts
Default

just wondering has it always done this or since fitting the CAI ? I'm wondering of the vac hoses and solenoid check valves got put back the right way round ?
BenRNBP is offline  
Reply With Quote
Old 06-30-2017, 11:38 AM
  #25
Thread Starter
 
Join Date: Nov 2009
Location: Banbury, Oxfordshire
Posts: 628
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Originally Posted by BenRNBP View Post
just wondering has it always done this or since fitting the CAI ? I'm wondering of the vac hoses and solenoid check valves got put back the right way round ?
Always done it sadly since I got it in Jan. I'm pretty sure it's all good it's the second one I've fitted

Has had an engine rebuild in the past (2006 engine fitted with all 2004 engine parts) so not sure if it's related to that
GhostWKD is offline  
Reply With Quote
Old 06-30-2017, 01:00 PM
  #26
 
Join Date: Nov 2013
Location: Norfolk
Posts: 2,251
Thanked 10 Times in 10 Posts
Default

Checked Ignition timing is advancing as it should with a strobe.
Gather would be different from a hot or a cold engine as vacuum may change things if its doing it correctly ?
noodels is offline  
Reply With Quote
Old 07-02-2017, 09:00 AM
  #27
 
Join Date: Nov 2013
Location: Norfolk
Posts: 2,251
Thanked 10 Times in 10 Posts
Default

noodels is offline  
Reply With Quote
Old 07-03-2017, 03:16 PM
  #28
Registered User
 
rickya's Avatar
 
Join Date: Dec 2016
Location: UK
Posts: 93
Thanked 2 Times in 2 Posts
Default

Mine does it too first thing when I start it up and then get stuck immediately in stop start traffic. It Kangaroos in 1st and 2nd gear with a slight shaky idle when changing gear. Soon stops after 5 minutes or so but can return in heavy traffic again. I have cleaned out IAC valve, throttle body, map sensor whack, done plugs, done Valve Clearances, Injector cleaner and fuel system cleaner, checked VAC pipes, checked Throttle position sensors and still no joy. I am now thinking it may need one of these items replacing but cant be bothered throwing more money at it chasing a hunch. These items are either : new IAC valve, new map sensor, 1st Lamda sensor, decat it???

Last edited by rickya; 07-03-2017 at 03:29 PM.
rickya is offline  
Reply With Quote
Old 07-03-2017, 03:26 PM
  #29
Registered User
 
rickya's Avatar
 
Join Date: Dec 2016
Location: UK
Posts: 93
Thanked 2 Times in 2 Posts
Default

Originally Posted by MB View Post
I'd say more likely the cat has collapsed.
Has there been cases of this causing the issue?
Is this more. likely than the Primary Lamda sensor?
rickya is offline  
Reply With Quote
Old 07-04-2017, 12:34 AM
  #30
Thread Starter
 
Join Date: Nov 2009
Location: Banbury, Oxfordshire
Posts: 628
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Originally Posted by rickya View Post
Mine does it too first thing when I start it up and then get stuck immediately in stop start traffic. It Kangaroos in 1st and 2nd gear with a slight shaky idle when changing gear. Soon stops after 5 minutes or so but can return in heavy traffic again. I have cleaned out IAC valve, throttle body, map sensor whack, done plugs, done Valve Clearances, Injector cleaner and fuel system cleaner, checked VAC pipes, checked Throttle position sensors and still no joy. I am now thinking it may need one of these items replacing but cant be bothered throwing more money at it chasing a hunch. These items are either : new IAC valve, new map sensor, 1st Lamda sensor, decat it???
This sounds pretty much the same as my issue. Slight difference but very very similar based on description.

Checked vac hoses on mine yesterday and all look fine. Spraying carb cleaner around the vac hoses didn't induce any increase in RPMs etc.

My Berk HFC should arrive today so I'll put that on and see if that makes any difference (and take a look at the stock cat). Then I'll try a new IACV valve and give up after that

Do need to do my valve adjustment but imagine that wouldn't affect it this severely. Throttle position sensor is a interesting one though as mine does look like it's possibly been messed with. Readings on the OBD2 reader look about right mind (iirc 12% closed and 88% full throttle)
GhostWKD is offline  
Reply With Quote
 


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 Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -8. The time now is 05:08 AM.


 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: