Welcome to the North American Subaru Impreza Owners Club Sunday December 17, 2017
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC General > Newbies & FAQs

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 10-20-2017, 11:10 AM   #1
alexholl
Scooby Newbie
 
Member#: 458056
Join Date: Nov 2016
Location: Queensbury, NY
Vehicle:
2005 Forester XT
Obsidian Black Pearl

Exclamation Miss after IM reinstall

Posting in here because I don't have enough responses to post new threads on the powertrain forum. Took out my intake manifold and TGV's on my 05 FXT to do grimmspeed phenolic spacers, mishimoto turbo inlet to fix a boost leak (causing a miss with no CEL), and new soft fuel lines to fix a small leak.

Ran a bit rough on first startup at 1500rpm idle, and i backed it out of my garage to get the revs up to 2500 so i could get the new coolant burped out. Threw a flashing CEL a few times through the rev range which disappeared after a couple seconds and didn't store any codes. Held it at 2500 for 2 mins, let off the gas and it idled around 1K. held it at 2500 for another minute and when i let off the gas revs dropped to 500 and very rough idle, but no CEL. ScangaugeII shows no stored or pending codes and that the car is "ready" for scanning.

I did unplug the coil packs on the passenger side, and when i plugged them back in they did not click, but they were firmly on there. Would a bad connection cause a misfire like this? Any help is greatly appreciated.
* Registered users of the site do not see these ads.
alexholl is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 10-20-2017, 12:03 PM   #2
Charlie-III
NASIOC Supporter
 
Member#: 30669
Join Date: Dec 2002
Chapter/Region: Tri-State
Location: USA, North NJ, 07456
Vehicle:
1998 Legacy 2.5GT
Silver Sleeper BK, 5MT

Default

Loose coil connection could be it. The larger vibration may make the connection intermittent. You can always use small tywraps to hold the connection together to rule that out.

Did you use an extra pair of intake gaskets?
Try spraying carb cleaner around the intake to head joint with the engine running. If RPM's change, you have an intake leak.
Charlie-III is online now   Reply With Quote
Old 10-20-2017, 12:10 PM   #3
alexholl
Scooby Newbie
 
Member#: 458056
Join Date: Nov 2016
Location: Queensbury, NY
Vehicle:
2005 Forester XT
Obsidian Black Pearl

Default

Ok, took the car for a quick drive around the block and 30 seconds in there was a flashing CEL and cruise. P0303. Checked the Cylinder 3 coil pack plug and the clip that is meant to hold it onto the pack wasn't there, which allowed it to move around and slide almost completely off. Looks like a new plug may be a dealer job

Definitely going to check around for intake leaks still. Whats the best way to address them if everything is torqued down to spec?
alexholl is offline   Reply With Quote
Old 10-20-2017, 12:15 PM   #4
Charlie-III
NASIOC Supporter
 
Member#: 30669
Join Date: Dec 2002
Chapter/Region: Tri-State
Location: USA, North NJ, 07456
Vehicle:
1998 Legacy 2.5GT
Silver Sleeper BK, 5MT

Default

Use a tywrap on the connector, many have done the same.

If you started torquing the outer bolts first, you may have an intake leak in the middle. Pretty much and torque job should start in the middle and "spiral out", think of smoothing out a table cloth, you put your hands in the middle and move out from the middle, not from the outer edge towards the middle.
Same goes for an intake, valve covers, heads, etc.
Charlie-III is online now   Reply With Quote
Old 10-20-2017, 01:06 PM   #5
alexholl
Scooby Newbie
 
Member#: 458056
Join Date: Nov 2016
Location: Queensbury, NY
Vehicle:
2005 Forester XT
Obsidian Black Pearl

Default

Quote:
Originally Posted by Charlie-III View Post
Use a tywrap on the connector, many have done the same.

If you started torquing the outer bolts first, you may have an intake leak in the middle. Pretty much and torque job should start in the middle and "spiral out", think of smoothing out a table cloth, you put your hands in the middle and move out from the middle, not from the outer edge towards the middle.
Same goes for an intake, valve covers, heads, etc.
did tighten from the middle out, and secured the coil pack connection. still seeing a cylinder 3 misfire, but it appeared to idle much smoother than before up until i backed out the car. What were you referring to when you said an extra pair of gaskets? If you mean new ones, yes. Theres also an upper to lower IM gasket on each face of the phenolic spacers.

Last edited by alexholl; 10-20-2017 at 01:35 PM.
alexholl is offline   Reply With Quote
Old 10-20-2017, 03:07 PM   #6
Charlie-III
NASIOC Supporter
 
Member#: 30669
Join Date: Dec 2002
Chapter/Region: Tri-State
Location: USA, North NJ, 07456
Vehicle:
1998 Legacy 2.5GT
Silver Sleeper BK, 5MT

Default

You put in a spacer, thus a new pair of intake basket surfaces.

Try the carb cleaner with engine running, decent way check for intake leaks.
Charlie-III is online now   Reply With Quote
Old 10-20-2017, 05:24 PM   #7
Elbert Bass
Scooby Specialist
 
Member#: 283429
Join Date: May 2011
Chapter/Region: South East
Location: Down yonder.
Default

Use a wire-tie like Charlie says. A couple of the skinny ones end to end between two of the wires and around coil pack head.
The dealer can get you that plug - it's a bit pricey - it comes with a free engine harness.
Elbert Bass is offline   Reply With Quote
Old 10-20-2017, 05:53 PM   #8
Charlie-III
NASIOC Supporter
 
Member#: 30669
Join Date: Dec 2002
Chapter/Region: Tri-State
Location: USA, North NJ, 07456
Vehicle:
1998 Legacy 2.5GT
Silver Sleeper BK, 5MT

Default

Quote:
Originally Posted by Elbert Bass View Post
Use a wire-tie like Charlie says. A couple of the skinny ones end to end between two of the wires and around coil pack head.
The dealer can get you that plug - it's a bit pricey - it comes with a free engine harness.
"Free engine harness".....,ouch........bend over.
Tywraps or similar, much cheaper and quick.......
Charlie-III is online now   Reply With Quote
Old 10-20-2017, 07:21 PM   #9
alexholl
Scooby Newbie
 
Member#: 458056
Join Date: Nov 2016
Location: Queensbury, NY
Vehicle:
2005 Forester XT
Obsidian Black Pearl

Default

Quote:
Originally Posted by Charlie-III View Post
You put in a spacer, thus a new pair of intake basket surfaces.

Try the carb cleaner with engine running, decent way check for intake leaks.
Sprayed some carb cleaner around all the gaskets and vacuum lines, no raise in revs. Thinking maybe that clip may be bad or a bad coil pack. doing spark plugs so ill swap the coil pack to cylinder 1 and see if the miss changes or not
alexholl is offline   Reply With Quote
Old 10-20-2017, 08:13 PM   #10
aberger19707
Scooby Newbie
 
Member#: 467128
Join Date: May 2017
Location: boise, id
Vehicle:
1998 LGT w/EJ205
Green

Default

also check to make sure your injector connections are seated correctly
aberger19707 is offline   Reply With Quote
Old 10-20-2017, 08:58 PM   #11
alexholl
Scooby Newbie
 
Member#: 458056
Join Date: Nov 2016
Location: Queensbury, NY
Vehicle:
2005 Forester XT
Obsidian Black Pearl

Default

I've done the following:

Checked for vac leaks around hoses and gaskets
Checked all connections, Cylinder 3 coil pack connector is broken but isn't causing the issue

Next step is spark plugs i guess, I may also swap cylinder 1 and 3 coil packs to dee if that could be my issue. Would it be correct to move on to injectors/fuel if the problem keeps up after this?
alexholl is offline   Reply With Quote
Old 10-21-2017, 11:51 AM   #12
horsePOOGAS
Scooby Newbie
 
Member#: 450712
Join Date: Jul 2016
Location: Indiana
Vehicle:
04 STi
WRB

Default

Before going to fuel I would keep checking spark on the cylinder it's throwing the code for. You can do a inline check. Me personally would also have someone else check connections that I had done just to have an extra set of hands to push to make sure they're all tight.

My guess is an electrical issues. But also personally I would rule out all electrical connections first (all working order) then move on to fuel related. You might think the coil with the missing clip is fine... But have you tested it?
horsePOOGAS is offline   Reply With Quote
Old 10-21-2017, 07:48 PM   #13
alexholl
Scooby Newbie
 
Member#: 458056
Join Date: Nov 2016
Location: Queensbury, NY
Vehicle:
2005 Forester XT
Obsidian Black Pearl

Default

I'm probably going to run it down to the dealership to have them look it over. I trust the guys down there and I need my daily back. Think its ok to drive the 8 miles down there with no 3rd cylinder?
alexholl is offline   Reply With Quote
Old 10-22-2017, 07:42 PM   #14
alexholl
Scooby Newbie
 
Member#: 458056
Join Date: Nov 2016
Location: Queensbury, NY
Vehicle:
2005 Forester XT
Obsidian Black Pearl

Default

Well it looks like problem solved. I had a little bit of free time and pulled the cyl 3 spark plug. looked clean and gapped to .028. Switched around the 1st and 3rd cyl coil acks and no misfire, just the little stumble I had before, probably from a dirty fuel system. Not sure why simply swapping the coil packs worked, but I'll take it
alexholl is offline   Reply With Quote
Old 10-23-2017, 11:17 AM   #15
Samurai Jack
Scooby Guru
 
Member#: 21145
Join Date: Jul 2002
Chapter/Region: NESIC
Location: Not in my own time
Vehicle:
2002 Enemy of Aku

Default

Zip tie that loose coil pack connector into place. You WILL have the issue return if you don't. It WILL wiggle loose over time.

Outfront Motorsports offers an inexpensive kit to repair the connector clip.
First you have to determine if the clip is broken or the tab on the igniter is gone that the clip locks to.
Samurai Jack is offline   Reply With Quote
Old 10-24-2017, 02:53 PM   #16
alexholl
Scooby Newbie
 
Member#: 458056
Join Date: Nov 2016
Location: Queensbury, NY
Vehicle:
2005 Forester XT
Obsidian Black Pearl

Default

Quote:
Originally Posted by Samurai Jack View Post
Zip tie that loose coil pack connector into place. You WILL have the issue return if you don't. It WILL wiggle loose over time.

Outfront Motorsports offers an inexpensive kit to repair the connector clip.
First you have to determine if the clip is broken or the tab on the igniter is gone that the clip locks to.
Its the harness clip thats broken, the clip on the coil is fine. Zip tied it for now until I replace it. I've been exploring my options for replacements so Ill keep Outfront in mind. Thanks for the tips
alexholl is offline   Reply With Quote
Reply

Thread Tools
Display Modes

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
Forum Jump

All times are GMT -4. The time now is 10:20 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2017 Axivo Inc.
Copyright ©1999 - 2017, North American Subaru Impreza Owners Club, Inc.