What causes "Herky Jerky" at parking lot speeds? - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members

Engine Performance This section is for discussion on all engine building related questions.
Sponsored by:
Sponsored by:

LinkBack Thread Tools Search this Thread
Old 03-08-2014, 10:28 PM   #21
Junior Member
iTrader: (1)
Join Date: Feb 2009
Location: Kamloops B.C.
Posts: 206
Total Cats: 24

I've had the same problem that was eventually traced to a throttle position sensor with a dead spot just above idle . One more thing to check !
fredb is offline   Reply With Quote
Old 03-08-2014, 11:52 PM   #22
Elite Member
iTrader: (2)
triple88a's Avatar
Join Date: Apr 2006
Location: Chicago, IL
Posts: 9,131
Total Cats: 598

Settings are one reason. Main reason for it though is backlash in the drivetrain. The gears smash together pick up all the slack because of the collision they go back, collide with the other end then repeat. You add an engine, some gas pedal action, and an extremely low gear and that's what happens.
triple88a is offline   Reply With Quote
Old 03-10-2014, 10:20 AM   #23
Junior Member
Join Date: Feb 2013
Posts: 52
Total Cats: -34

Have you adjusted your tps?
MeowMeowTurbo is offline   Reply With Quote
Old 03-10-2014, 10:23 AM   #24
Boost Czar
iTrader: (61)
Braineack's Avatar
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,840
Total Cats: 1,786

if I had this issue, I'd have fixed my idle control and accel enrichments (accel-pump and EAE) by now...
Braineack is offline   Reply With Quote
Old 03-11-2014, 08:33 PM   #25
Elite Member
Thread Starter
Chiburbian's Avatar
Join Date: Feb 2008
Location: Gilberts, IL
Posts: 2,158
Total Cats: 131

Originally Posted by Braineack View Post
if I had this issue, I'd have fixed my idle control and accel enrichments (accel-pump and EAE) by now...
I asked for advice and got it. In the meantime we have had some very cold weather and snow. As I have a winter vehicle I don't drive my car in snow or on salty roads. I drove it around a bit yesterday but didn't have time to screw with it. I likely will work on my idle and settings on Saturday.

Thanks for your help all.
Chiburbian is offline   Reply With Quote
Old 03-12-2014, 09:56 PM   #26
Elite Member
iTrader: (2)
Mobius's Avatar
Join Date: May 2008
Location: Portland, Oregon
Posts: 3,176
Total Cats: 261

Bracing your right foot against the trans tunnel can get rid of much of it. A lot of it is due to it being right at that resonant frequency where it's affecting your foot on the gas and you're trying to compensate and you end up looking like a tool. Bracing your foot so it can't move can help it a lot. My car has always done it sometimes, and my diff & motor mounts are both new last spring.
Mobius is offline   Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 57 07-19-2017 05:11 PM
Expected intake temps on the track? tazswing Race Prep 20 10-03-2015 12:04 PM
Noob to Miataturbo from MA JxPhan Meet and Greet 3 10-02-2015 03:17 AM

jerk, low speed, parking speed

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 -4. The time now is 02:35 PM.