Misfire/hesitancy around 3500rpm? - GT-R Register - Nissan Skyline and GT-R Drivers Club forum

Want to buy a banner ad? Find out more here.

Go Back   GT-R Register - Nissan Skyline and GT-R Drivers Club forum > General > Nissan Skyline > Tuning: General
Register Garage FAQ Members List Calendar Search Today's Posts Mark Forums Read Insurance


Reply
 
LinkBack Thread Tools Rate Thread Display Modes
Old 20th October 2004, 11:51 AM   #1 (permalink)
-C-
-C- is unaware they can edit their status
GTR.co.uk seasoned Member
 
Join Date: Oct 2003
Location: Button Moon
Cars owned: The Mystery Machine
Posts: 1,362
Misfire/hesitancy around 3500rpm?

Hmmm

My car when I last drove it seems to be developing a slight missfire in the lower gears around the above rpms. It's just about where the car slowly starts to make positive boost.

Once it's 'cleared' itself & will carry on fine as it always has done, no other detrimental things going on from what I can tell...

Any suggestions? I thought maybe plugs but surely it would happen through the whole rev range then?

Bit confused now!
__________________
Chris

2 Wheels are better than 4!
-C- is offline   Reply With Quote
Old 20th October 2004, 12:05 PM   #2 (permalink)
s2gtr is RS6 Owner, After 5 GT-R's
Executive GTR Owners Club Member
 
s2gtr's Avatar
 
Join Date: Jun 2001
Location: DORSET
Cars owned: R33GT-S,R33GT-R,R34GT-R Now R35GT-R
Posts: 2,580
Hi,

Had a similar problem with my R33-GTR turned out to be the lambda sensors.

Dave.
__________________
s2gtr is offline   Reply With Quote
Old 20th October 2004, 12:43 PM   #3 (permalink)
empi is unaware they can edit their status
 
Join Date: Jun 2004
Posts: 565
Are you running F Con Pro ?
__________________
empi is offline   Reply With Quote
 
Old 20th October 2004, 12:44 PM   #4 (permalink)
-C-
-C- is unaware they can edit their status
GTR.co.uk seasoned Member
 
Join Date: Oct 2003
Location: Button Moon
Cars owned: The Mystery Machine
Posts: 1,362
Nope!

Still runs with the AFM's too (albeit the big Z32 types)
__________________
Chris

2 Wheels are better than 4!
-C- is offline   Reply With Quote
Old 20th October 2004, 12:53 PM   #5 (permalink)
empi is unaware they can edit their status
 
Join Date: Jun 2004
Posts: 565
Quote:
Originally Posted by -C-
Nope!

Still runs with the AFM's too (albeit the big Z32 types)
I had a stutter in the low rev range which would come and go, then clear under load!, it drove me nuts it turned out to be a loose injector.
__________________
empi is offline   Reply With Quote
Old 20th October 2004, 01:27 PM   #6 (permalink)
Pavlo is unaware they can edit their status
GTR.co.uk seasoned Member
 
Join Date: Sep 2002
Location: zen
Cars owned: [email protected] flat 4
Posts: 568
do you run a VTA dump valve? If so, try blocking it, it sounds like the DV is leaking on vacuum then you get a hicup as it seals and suddenly throws the AFR out.

Paul
__________________
Pavlo is offline   Reply With Quote
Old 21st October 2004, 05:56 PM   #7 (permalink)
RocK is a racer..
GTR.co.uk seasoned Member
 
RocK's Avatar
 
Join Date: Oct 2004
Location: Brunei
Cars owned: BCNR33 V-Spec
Posts: 172
Quote:
Originally Posted by empi
Are you running F Con Pro ?
i got the same hicup. I'm running F Con V pro.

My 1st thought were the plugs, but i replace them its still there.

any ideas? thanks..
__________________
RocK is offline   Reply With Quote
Old 22nd October 2004, 12:40 PM   #8 (permalink)
Chris Wilson is unaware they can edit their status
GTR.co.uk seasoned Member
 
Join Date: Aug 2001
Location: Shropshire
Cars owned: R33 GTS-t with RB26 engine and Tractive dog box. And too many race cars according to `er indoors...
Posts: 3,171
Quote:
Originally Posted by -C-
Hmmm

My car when I last drove it seems to be developing a slight missfire in the lower gears around the above rpms. It's just about where the car slowly starts to make positive boost.

Once it's 'cleared' itself & will carry on fine as it always has done, no other detrimental things going on from what I can tell...

Any suggestions? I thought maybe plugs but surely it would happen through the whole rev range then?

Bit confused now!
On my R33 GTR it was a dead O2 sensor, probably failed when I had the engine out, they don't like being knocked about when they have a few miles on them. The CONSULT box will show this or anyone competent with an oscilloscope can test them.
__________________
Best Regards,
Chris Wilson.
Chris Wilson is offline   Reply With Quote
Old 22nd October 2004, 12:49 PM   #9 (permalink)
nigel f is unaware they can edit their status
Executive GTR Owners Club Member
 
nigel f's Avatar
 
Join Date: Sep 2002
Location: East yorkshire
Cars owned: R33 GTR V SPEC, R34 GTR
Posts: 1,651
It could be the Ignition Amp, I found that under load it wasnt as bad as light load and higher up the revs it wasnt as bad.

I did change the plugs and the coil packs etc, but proved it to the the Amp.

Nigel
__________________
nigel f is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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 On
Pingbacks are On
Refbacks are On



All times are GMT. The time now is 11:46 PM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
http://www.Tyreforums.com

tyreforums

 

Garage Plus vBulletin Plugins by Drive Thru Online, Inc.