Revs dieing! - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


General Miata Chat A place to talk about anything Miata

Reply
 
 
 
LinkBack Thread Tools
Old 10-18-2006, 07:53 AM   #1
Junior Member
Thread Starter
 
Join Date: Jan 2005
Location: United Kingdom
Posts: 255
Total Cats: 0
Default Revs dieing!

As itsa got a bit colder here in the UK now on the way to and from work I find my revs dieing on idle or pullign up to a junction stop.

Is the alternator on the way out as i have the lights on, heater blowing, stereo on runing 2 amps etc!

or is it a air leak somewhere?
tabs604 is offline   Reply With Quote
Old 10-18-2006, 09:49 AM   #2
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,892
Total Cats: 1,792
Default

if the volts are still near the 13-13.5 mark when everything is on then I would rule out the alternator.
Braineack is offline   Reply With Quote
Old 10-18-2006, 10:37 AM   #3
Senior Member
iTrader: (14)
 
brgracer's Avatar
 
Join Date: Nov 2004
Location: Ambler, PA
Posts: 1,275
Total Cats: 1
Default

Check the alternator belt tension. Check your vac at idle. Are the revs dropping and you stall or is it the annoying idle droop then recover?
brgracer is offline   Reply With Quote
Old 10-18-2006, 10:54 AM   #4
Junior Member
Thread Starter
 
Join Date: Jan 2005
Location: United Kingdom
Posts: 255
Total Cats: 0
Default

Quote:
Originally Posted by braineack View Post
if the volts are still near the 13-13.5 mark when everything is on then I would rule out the alternator.
yes they are. However If I turn the fan swith to 3-4 it will do down to 12/12.5!
tabs604 is offline   Reply With Quote
Old 10-18-2006, 10:56 AM   #5
Junior Member
Thread Starter
 
Join Date: Jan 2005
Location: United Kingdom
Posts: 255
Total Cats: 0
Default

Quote:
Originally Posted by brgracer View Post
Check the alternator belt tension. Check your vac at idle. Are the revs dropping and you stall or is it the annoying idle droop then recover?
It seems liek an idel droop that recovers. the car has not completely cut out.

with the stereo off, gheaters off and lights off..its seems fine.

Its a 14 year old car so dont know when the alternator has ever been replaced as i have had her for 3 years.

Could i use a higher amped alternator from a MK2 one and will it go straight on.

i can readily get them!
tabs604 is offline   Reply With Quote
Old 10-18-2006, 11:31 AM   #6
Elite Member
iTrader: (3)
 
Mach929's Avatar
 
Join Date: Oct 2004
Location: lansdale PA
Posts: 2,500
Total Cats: 0
Default

no i researched higher output alternators when i had a lot of stereo stuff in mine, the only real solution seemed to be have one rebuilt.
Mach929 is offline   Reply With Quote
Old 10-18-2006, 01:25 PM   #7
Elite Member
 
Join Date: Jan 2005
Location: vancouver canada
Posts: 1,618
Total Cats: 0
Default

Sounds like it's time for a stiffening cap if you don't already have one.
spike is offline   Reply With Quote
Old 10-18-2006, 01:37 PM   #8
Elite Member
iTrader: (2)
 
Newbsauce's Avatar
 
Join Date: Jul 2006
Location: NoVA
Posts: 2,304
Total Cats: 2
Default

I have this same problem... every time I turn on my headlights my idle actually drops then recovers. Its odd.
Newbsauce is offline   Reply With Quote
Old 11-08-2006, 10:53 AM   #9
Junior Member
Thread Starter
 
Join Date: Jan 2005
Location: United Kingdom
Posts: 255
Total Cats: 0
Default

done some research on this at the miata.net forum.

It seems this is a common problem and is not necessarily battery/alternator related.

I have concluded from the research that it is either of the following:

- Blocked fuel filter
- Idle control valve needs adjustment
- Throttle boddy needs cleaning with carb cleaner

Any ideas?

i will be be taking the throttle body intercooler pipe off and cleaning the butterfly valve with carb cleaner.
tabs604 is offline   Reply With Quote
Old 11-08-2006, 10:56 AM   #10
Elite Member
iTrader: (9)
 
Join Date: Aug 2006
Location: Concord, North Carolina
Posts: 4,173
Total Cats: 5
Default

mine would do that, but I'm N/A, it was the throttle body butterfly...it helped out a TON, just spray with cleaner, wipe with a rag if you can...spray some more cleaner...mine was...nasty as hell really lol.

Idle was fine...throttle response was even helped lol.
miatamania is offline   Reply With Quote
Old 11-08-2006, 04:57 PM   #11
Junior Member
Thread Starter
 
Join Date: Jan 2005
Location: United Kingdom
Posts: 255
Total Cats: 0
Default

CURED!

no more idle droop....!

Did the idle droop fix in miata.net/garage/ignition!
tabs604 is offline   Reply With Quote
Old 11-08-2006, 05:01 PM   #12
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,892
Total Cats: 1,792
Default

what did you do, bump the idle speed up a bit?
Braineack is offline   Reply With Quote
Old 11-08-2006, 06:17 PM   #13
Junior Member
Thread Starter
 
Join Date: Jan 2005
Location: United Kingdom
Posts: 255
Total Cats: 0
Default

yes indeed!
tabs604 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
MS PNP requires reading and following directions??? satisfied MEGAsquirt 141 10-06-2015 11:44 AM
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
Are my coils failing? viriiguy General Miata Chat 5 09-28-2015 08:39 PM
Another Alternator thread ihiryu General Miata Chat 9 09-28-2015 11:22 AM
In what world... curly MEGAsquirt 11 09-22-2015 12:54 PM


Thread Tools

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 03:41 AM.