EvolutionM - Mitsubishi Lancer and Lancer Evolution Community

Notices
Evo General Discuss any generalized technical Evo related topics that may not fit into the other forums. Please do not post tech and rumor threads here.
Sponsored by: RavSpec - JDM Wheels Central

Issue with cylinders cutting out or something? Tuner and I are stumped.

Thread Tools
 
Search this Thread
 
Old Apr 18, 2017, 01:13 PM
  #16  
Evolved Member
Thread Starter
iTrader: (5)
 
Bmurray's Avatar
 
Join Date: Nov 2012
Location: Burlington, NC
Posts: 644
Received 69 Likes on 54 Posts
Originally Posted by DecBro
When it bogs down is it usually when you shift under WOT, then back to WOT? Curious as I've had that same problem appear a couple times.

Do you run a test pipe or do you have a cat installed? What PSI you running? I may have missed it.
Yes happens after wot then back to wot, I always lift when shifting. Test pipe. 28psi FP red.
Bmurray is offline  
Reply Like
Old Apr 18, 2017, 01:25 PM
  #17  
EvoM Guru
iTrader: (1)
 
LetsGetThisDone's Avatar
 
Join Date: Oct 2013
Location: Las Vegas
Posts: 15,755
Received 1,543 Likes on 1,322 Posts
I thought you were running speed density? How was there a stock MAP sensor on it?
LetsGetThisDone is offline  
Reply Like
Old Apr 18, 2017, 01:59 PM
  #18  
Evolved Member
Thread Starter
iTrader: (5)
 
Bmurray's Avatar
 
Join Date: Nov 2012
Location: Burlington, NC
Posts: 644
Received 69 Likes on 54 Posts
Originally Posted by letsgetthisdone
I thought you were running speed density? How was there a stock MAP sensor on it?
the car was just switched to speed density this past Wednesday.
Bmurray is offline  
Reply Like
Old Apr 18, 2017, 02:30 PM
  #19  
EvoM Guru
iTrader: (1)
 
LetsGetThisDone's Avatar
 
Join Date: Oct 2013
Location: Las Vegas
Posts: 15,755
Received 1,543 Likes on 1,322 Posts
Swap another Omni MAP sensor on. It sounds like a fueling problem caused by improper airflow calcs which would be caused by a bad MAP. Omni doesn't exactly have a 100% track record like an OEM part. I just replaced on last week that was reading 2-3psi high (comparing load vs boost), and would occasionally cause the car to hiccup just like you're describing yours is.
LetsGetThisDone is offline  
Reply Like
Old Apr 18, 2017, 04:36 PM
  #20  
Evolved Member
Thread Starter
iTrader: (5)
 
Bmurray's Avatar
 
Join Date: Nov 2012
Location: Burlington, NC
Posts: 644
Received 69 Likes on 54 Posts
Originally Posted by letsgetthisdone
Swap another Omni MAP sensor on. It sounds like a fueling problem caused by improper airflow calcs which would be caused by a bad MAP. Omni doesn't exactly have a 100% track record like an OEM part. I just replaced on last week that was reading 2-3psi high (comparing load vs boost), and would occasionally cause the car to hiccup just like you're describing yours is.
It happened with the original oem (54k mile) sensor as well. But worth a try
Bmurray is offline  
Reply Like
Old Apr 19, 2017, 07:02 AM
  #21  
Newbie
iTrader: (3)
 
Ians06's Avatar
 
Join Date: Jun 2010
Location: East TN
Posts: 60
Received 4 Likes on 4 Posts
MAP sensor!
Ians06 is offline  
Reply Like
Old Apr 19, 2017, 07:55 AM
  #22  
EvoM Guru
iTrader: (1)
 
LetsGetThisDone's Avatar
 
Join Date: Oct 2013
Location: Las Vegas
Posts: 15,755
Received 1,543 Likes on 1,322 Posts
Originally Posted by Bmurray
It happened with the original oem (54k mile) sensor as well. But worth a try
You can't run SD on a stock MAP. It sounds like there is an airflow calc issue. On SD, the MAP and RPM are the only inputs for that.
LetsGetThisDone is offline  
Reply Like
Old Apr 19, 2017, 08:22 AM
  #23  
Evolved Member
Thread Starter
iTrader: (5)
 
Bmurray's Avatar
 
Join Date: Nov 2012
Location: Burlington, NC
Posts: 644
Received 69 Likes on 54 Posts
Originally Posted by letsgetthisdone
You can't run SD on a stock MAP. It sounds like there is an airflow calc issue. On SD, the MAP and RPM are the only inputs for that.
I know that. The issue happened with the oem map sensor on MAF. I switched the car to speed density last wednesday with the new Omni 4 bar and problem is still happening. Hopefully that clarifies a little. I do not believe it is the map sensor. Unless it's a freakish coincidence that the original map sensor happened to be messed up AND the new Omni 4 bar is messed up. Just don't think so.
Bmurray is offline  
Reply Like
Old Apr 19, 2017, 09:16 AM
  #24  
Evolved Member
iTrader: (4)
 
4G63_EVO's Avatar
 
Join Date: Jul 2012
Location: Pasadena CA
Posts: 721
Received 46 Likes on 45 Posts
Originally Posted by Bmurray
I know that. The issue happened with the oem map sensor on MAF. I switched the car to speed density last wednesday with the new Omni 4 bar and problem is still happening. Hopefully that clarifies a little. I do not believe it is the map sensor. Unless it's a freakish coincidence that the original map sensor happened to be messed up AND the new Omni 4 bar is messed up. Just don't think so.
Ive seen freakish stuff happen before, you never know
4G63_EVO is offline  
Reply Like
Old Apr 19, 2017, 09:17 AM
  #25  
EvoM Guru
iTrader: (1)
 
LetsGetThisDone's Avatar
 
Join Date: Oct 2013
Location: Las Vegas
Posts: 15,755
Received 1,543 Likes on 1,322 Posts
When running the MAF the stock MAP sensor doesn't really do anything except act as input for the ECU to calculate when to use the EGR.
LetsGetThisDone is offline  
Reply Like
Old Apr 26, 2017, 06:09 PM
  #26  
Evolved Member
Thread Starter
iTrader: (5)
 
Bmurray's Avatar
 
Join Date: Nov 2012
Location: Burlington, NC
Posts: 644
Received 69 Likes on 54 Posts
Here are the overdue pictures of the plugs.

Name: C3773E0D-DF97-4E7E-B5D4-C6645A7B61DF_zps1kausone.jpg Views: 0 Size: 227.0 KB
Bmurray is offline  
Reply Like
Old Apr 27, 2017, 12:04 PM
  #27  
EvoM Guru
iTrader: (1)
 
LetsGetThisDone's Avatar
 
Join Date: Oct 2013
Location: Las Vegas
Posts: 15,755
Received 1,543 Likes on 1,322 Posts
Why are the electrodes bent on two of them? That could be an issue, causing a misfire. Get new plugs. Gap them to .020" with a FEELER GAUGE, not the plug gapper thing from autozone.
LetsGetThisDone is offline  
Reply Like
Old Apr 27, 2017, 01:01 PM
  #28  
Evolved Member
iTrader: (4)
 
4G63_EVO's Avatar
 
Join Date: Jul 2012
Location: Pasadena CA
Posts: 721
Received 46 Likes on 45 Posts
Originally Posted by letsgetthisdone
Why are the electrodes bent on two of them? That could be an issue, causing a misfire. Get new plugs. Gap them to .020" with a FEELER GAUGE, not the plug gapper thing from autozone.
Good eye
4G63_EVO is offline  
Reply Like
Old Apr 27, 2017, 07:32 PM
  #29  
Evolved Member
Thread Starter
iTrader: (5)
 
Bmurray's Avatar
 
Join Date: Nov 2012
Location: Burlington, NC
Posts: 644
Received 69 Likes on 54 Posts
Originally Posted by letsgetthisdone
Why are the electrodes bent on two of them? That could be an issue, causing a misfire. Get new plugs. Gap them to .020" with a FEELER GAUGE, not the plug gapper thing from autozone.
Def a good eye. New plugs will be picked up tomorrow. Currently awaiting a new intake from ETS and then will report back
Bmurray is offline  
Reply Like
Old May 8, 2017, 09:32 AM
  #30  
Newbie
 
DecBro's Avatar
 
Join Date: Oct 2016
Location: Riverside, CA
Posts: 67
Received 2 Likes on 2 Posts
Originally Posted by Bmurray
Def a good eye. New plugs will be picked up tomorrow. Currently awaiting a new intake from ETS and then will report back
Any update on how the new plugs went? Let us know, I'm keen to see what fixes the issue as I've had the same thing happen a few times. I'm gapped at .23 on OEM plugs, but might regap to .20
DecBro is offline  
Reply Like



Advanced Search
Quick Reply: Issue with cylinders cutting out or something? Tuner and I are stumped.


Reply Closed Thread Share

All times are GMT -7. The time now is 05:25 AM.