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

1999 Miata, Low RPM hesitiation

Thread Tools
 
Search this Thread
 
Old Feb 28, 2013 | 07:49 PM
  #21  
flounder's Avatar
Elite Member
 
Joined: Mar 2010
Posts: 1,524
Total Cats: 31
From: Detroit
Default

I've got a couple suggestions....

Check the air gap between the ckp sensor and the trigger wheel. Also, you mentioned that your pulley is wobbling. You may want to remove it and check that the keyway isn't worn from improper torquing of the front crank bolt. The trigger wheel is bolted to the pulley, so if it's wobbling around it could certainly cause issues with improper spark timing, probably more noticeable at idle/lower rpm.
Old Mar 1, 2013 | 02:09 PM
  #22  
Zabac's Avatar
Elite Member
iTrader: (39)
 
Joined: Sep 2007
Posts: 4,850
Total Cats: 8
From: High Point NC
Default

Switch the MAF sensor with a known good one, I believe that is your problem.
And check wiring to the MAF sensor as well, just to be sure nothing was tampered with with new Intake...
Old Mar 8, 2013 | 11:30 AM
  #23  
AredMiata's Avatar
Thread Starter
Junior Member
 
Joined: May 2011
Posts: 115
Total Cats: -1
From: Columbia, SC
Default

All good suggestions, will try when i get a minute.
Old Mar 14, 2013 | 09:28 PM
  #24  
Vilko's Avatar
Junior Member
 
Joined: Mar 2012
Posts: 111
Total Cats: 8
Default

When do you get backfires out the intake?
I get a backfire out the intake when I turn the key to "ON". If I have the throttle open it sounds like a gun being fired.
When this happens it tends to be hesitant and rough on low rpm, until it warms up. Is your rough running consistant no matter the conditions?

Curious if you're having the same issue as I am.
Old Mar 18, 2013 | 04:30 PM
  #25  
flounder's Avatar
Elite Member
 
Joined: Mar 2010
Posts: 1,524
Total Cats: 31
From: Detroit
Default

/\ Mine does that occasionally too. Are you still on the stock ecm? I've found that when you "key on" all four plugs spark at the same time once. I always figured it was either some un-burnt fuel remaining in one of the cylinders on last shut down, or a slightly leaky injector that filled up one of the cylinders until all the fuel pressure has bled off.

I could be completely wrong but it seems to make sense.
Old Mar 24, 2013 | 07:03 PM
  #26  
Vilko's Avatar
Junior Member
 
Joined: Mar 2012
Posts: 111
Total Cats: 8
Default

Ecm? Im on stock ecu if that's what u mean.
Before I leave I normally hold the accelerator open to let it air out a bit. It seems to help a bit but it can be time consuming. I always assumed it was a leaky injector. Im changing out the injectors when I install my ms3 and hoping that fixes it.
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
kronikker
Miata parts for sale/trade
17
Oct 6, 2015 10:18 PM
Johnny Tater
Engine Performance
3
Sep 23, 2015 06:10 PM
vehicular
General Miata Chat
12
Sep 14, 2015 03:17 PM
mdkimbal
WTB
0
Sep 6, 2015 09:39 PM




All times are GMT -4. The time now is 09:32 PM.