Idling extremely rich, rough. - 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 11-26-2008, 02:56 PM   #1
FHS
Senior Member
Thread Starter
iTrader: (2)
 
Join Date: Oct 2004
Location: Los Angeles, Ca.
Posts: 502
Total Cats: 0
Default Idling extremely rich, rough.

Posted this in the Emanage section but I thought i would try here.

My car had a recent engine rebuild. I replaced the rods and pistons with Belfabs. 78mm overbore on the pistons.

It was running fine, but stalling when coming to a stop when warm. That was a problem before the rebuild though. I was driving on surface streets and the car bucked and stalled, wouldn't start immediatly, then idled really rough once it did start. A mechanic did manage to get it running again temproarily. Same thing happend on the freeway. Aftermarket stuff I've checked were BEGi FPR, and reconnected my stock EMB cutters. I took it to my mechanic and he's replaced practically everything stock involved in fueling. Checked the AFM, fuel pump, coils, spark plug wires, and spark plugs. It ran again, temporarily, now it's back to doing the same thing, idling rough and rich, and stalling.

The only thing i can really think of to check next would be the O2 sensor/wiring (Bosch 4-wire), or maybe the Autotune/wiring and EMB/wiring, maybe even my Piersburg.

I just sent the wiring instructions for the Autotune to my mechanic.

Other than that, anything i could have missed?
FHS is offline   Reply With Quote
Old 11-26-2008, 03:04 PM   #2
Elite Member
iTrader: (15)
 
patsmx5's Avatar
 
Join Date: Aug 2007
Location: Houston, TX
Posts: 8,796
Total Cats: 247
Default

Wish I could help. My only suggestion is to isolate the problem. IE-if it's a fuel pressure problem, a loss of spark problem, or a Emanage problem.

I'd put a fuel pressure gauge on it so you can monitor it at all times and see if there's a correlation between fuel pressure and running like ****.
patsmx5 is offline   Reply With Quote
Old 11-27-2008, 02:00 AM   #3
Junior Member
iTrader: (5)
 
Join Date: Jan 2006
Posts: 345
Total Cats: 0
Default

have you reset your base idle?
Are you certain there is not a vac leak?
I second getting a fuel pressure gauge.
You've got an emanage, how about logging for awhile to see what might show itself?
Were your injectors cleaned?
Does it kick any CEL, and have you checked for codes even if it doesn't?
tronik is offline   Reply With Quote
Old 11-27-2008, 02:26 AM   #4
I'm Miserable!
iTrader: (5)
 
Join Date: Sep 2005
Location: SLC, Utah
Posts: 1,591
Total Cats: 0
Default

How is your master fuel and injector offset looking?
zoom2zoom is offline   Reply With Quote
Old 11-27-2008, 02:35 PM   #5
FHS
Senior Member
Thread Starter
iTrader: (2)
 
Join Date: Oct 2004
Location: Los Angeles, Ca.
Posts: 502
Total Cats: 0
Default

Thanks guys,

Turned out to be a whole bunch of things going wrong all at once. The 12v source for my 4-wire O2 sensor loose and shorted. Some of the cutters from my EMB harness were a bit loose as well. Apparently, the coils were also weak.

My injectors had recently been seviced an cleaned.

Quote:
How is your master fuel and injector offset looking?
This, however, might need to be looked at. I've been having stalling problems going back at least 6 months that I have not been able to fix.

How do I check the master fuel and injector offset?
FHS is offline   Reply With Quote
 
 
Reply

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
why is my car running like pewp? (tune/datalog) itsMikey MSPNP 3 09-28-2015 07:40 AM


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 06:42 AM.