idle fluctuation and dies - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to   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 03-17-2013, 01:41 PM   #1
Thread Starter
Join Date: Dec 2012
Location: San Jose, CA
Posts: 31
Total Cats: 3
Default idle fluctuation and dies

So I have been having a weird problem with the idle of my car. When I let the car idle on its own, the rpms go up and down, up and down, like its trying to stabilize itself. Also when I drive my car and slow down to a stop, the car's rpm dips all the way down to zero and does the the idle fluctuation, but the idle dips go all the way down to until the car basically stalls itself. Can anyone help? I'm running a 1993 with a Begi Shanghai starter kit on band-aids (begi afpr, o2 clamp, greentop supra injector, and tweaked with the afm)
Canipete is offline   Reply With Quote
Old 03-17-2013, 02:04 PM   #2
Elite Member
iTrader: (2)
Join Date: Jun 2009
Location: Istanbul, Turkey
Posts: 2,050
Total Cats: 433

Adjust idle using bypass screw on the TB, on a warm engine with no electrical load, wheels straight and the IAC valve unplugged.
950 RPM is a good idle speed.
Godless Commie is offline   Reply With Quote
Old 03-19-2013, 06:21 PM   #3
Join Date: Mar 2013
Location: Chardon Ohio
Posts: 33
Total Cats: 0

I had the same issue. on my car, it turned out that the ISCV was bad. I replaced that with one from a wrecked car and it idles fine now, even when cold.

However, i still have the second problem- it will die if occasionally. usually when I come out of boost and shift to neutral. so every time i come to a stop light, it dies. Could this be a problem with the throttle position sensor? does it not realize that I've closed the throttle until too late?
LeroyTurbo is offline   Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
Back to Stock Part Out!! Turbo Parts, MS2 Enhanced 01-05, Suspension, and MOAR! StratoBlue1109 Miata parts for sale/trade 16 10-02-2015 10:39 AM
Time to start learning and play with tuning The Gleas MEGAsquirt 3 10-01-2015 10:30 AM
Low oil pressure after 1.8 swap and new turbo setup JesseTheNoob DIY Turbo Discussion 15 09-30-2015 03:44 PM
Are my coils failing? viriiguy General Miata Chat 5 09-28-2015 08:39 PM
why is my car running like pewp? (tune/datalog) itsMikey MSPNP 3 09-28-2015 07:40 AM

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 07:00 PM.