turned key while running, idle bad now - 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 04-29-2009, 11:05 PM   #1
Newb
Thread Starter
 
Join Date: Apr 2009
Posts: 1
Total Cats: 0
Default turned key while running, idle bad now

could I have wrecked my engine? I turned the key while it was running, and now the idle sounds SUPER rough. i limped home, but worried about bent valves etc

grrr
harold is offline   Reply With Quote
Old 04-29-2009, 11:16 PM   #2
Elite Member
iTrader: (21)
 
paul's Avatar
 
Join Date: Jun 2006
Location: Point Pleasant, NJ
Posts: 2,957
Total Cats: 2
Default

How exactly do you think the valves, that have no chance of hitting the pistons because we have a non-interference motor, could bend by turning a key?

Maybe the timing belt jumped so that's off now? Not sure if that's possible but I guess if the crank comes to 300rpm instantly the cams could have enough momentum to cause slack in the belt before the crank gear which could allow it to jump a tooth or 2.
paul is offline   Reply With Quote
Old 04-29-2009, 11:25 PM   #3
Boost Pope
iTrader: (8)
 
Joe Perez's Avatar
 
Join Date: Sep 2005
Location: Delicious and Moist.
Posts: 26,323
Total Cats: 1,920
Default

I can't imagine the starter actually managing to catch the flywheel while idling. Ever hear somebody turn the key while the engine is running? The starter gear normally just grinds on the ring gear of the flywheel without ever fully extending.
Joe Perez is offline   Reply With Quote
Old 04-29-2009, 11:29 PM   #4
y8s
2 Props,3 Dildos,& 1 Cat
iTrader: (8)
 
y8s's Avatar
 
Join Date: Jun 2005
Location: Fake Virginia
Posts: 19,038
Total Cats: 407
Default

maybe you ground off a few teeth on the ring gear.

also: hahaha
y8s is offline   Reply With Quote
Old 04-30-2009, 09:08 AM   #5
Slowest Progress Ever
iTrader: (26)
 
thirdgen's Avatar
 
Join Date: Oct 2007
Location: The coal ridden hills of Pennsylvania
Posts: 5,808
Total Cats: 183
Default

So to clarify this, you had the engine idling...then turned the key. The starter made a grinding noise and you said, "oh ****, it's already running!" Then it started to idle weird.

I never saw anything like this happen in my entire life that would cause an idle issue, but like Paul said, maybe the timing belt jumped? I don't know what year it is, but if it's a 99 then maybe the harmonic vibrations from your actuated kneuter valve caused the timing wheel to flex and you knocked a tooth off it. Either that or I'd check the flux capacitor.

Seriously though, start it up and shoot it with a timing light, and report back with the results.
thirdgen is offline   Reply With Quote
Old 04-30-2009, 10:28 AM   #6
Tour de Franzia
iTrader: (6)
 
hustler's Avatar
 
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,114
Total Cats: 351
Default

stupid thread
stupid person
hustler is offline   Reply With Quote
Old 04-30-2009, 11:20 AM   #7
Moderator
iTrader: (11)
 
sixshooter's Avatar
 
Join Date: Nov 2008
Location: Tampa, Florida
Posts: 15,669
Total Cats: 1,561
Default

+1 on busted kneuter valve. They just aren't designed for that kind of abuse.
sixshooter is offline   Reply With Quote
Old 04-30-2009, 11:42 AM   #8
Elite Member
iTrader: (46)
 
Stein's Avatar
 
Join Date: Dec 2007
Location: Nebraska
Posts: 4,812
Total Cats: 138
Default

Quote:
Originally Posted by harold View Post
could I have wrecked my engine? I turned the key while it was running, and now the idle sounds SUPER rough. i limped home, but worried about bent valves etc

grrr
Sound like a question to post over at miata.net. That's where all the smart people hang out. We really don't work on our cars, we just talk big and bench race. See this thread for reference. https://www.miataturbo.net/forum/t34575/
Stein is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
15x10 - 15x11 6UL @ 949 Racing emilio700 Wheels and Tires 151 06-02-2017 03:36 PM
Need help - Stock Balancer and Fastforward overlay pulleys Frank_and_Beans Supercharger Discussion 13 09-12-2016 09:17 PM
Missing/knock at idle, can someone point me in the right direction? Mikel MEGAsquirt 4 09-28-2015 05:46 PM
why is my car running like pewp? (tune/datalog) itsMikey MSPNP 3 09-28-2015 07:40 AM
Recommended Tire Temp for best friction thumpetto007 Race Prep 4 09-27-2015 06:16 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 08:25 AM.