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Really rough idle on EJ20T

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GTMac Fahrvergnugen

976 posts · joined Nov 2004 ·

#484439
Guys any ideas, this is driving me crazy.

I have no fault code readings whatsoever. I have checked plugs and I have very rough idle, no power and back firing when I try to drive.

Checked as many hoses as I can see like a vacumm leak and cant see anything.

It was running beautifully and then I did a gearbox change and swapped over a broken BOV and now its running rough. Charcoal cannister also hooked up but dont assume that would effect anything?

My best way to describe it is that it fels and sounds like its running on 3 cylinders.
1971 Type 3 Fasty - EJ20T

I love 242HP sleepers. 🤪

How many sets of lights does it take a $229k Carrera S to learn? 😂 UPDATE: Cayman S, M3, B4 now added to the list.

JVLR Slammed & Awesome Dubber

79 posts · joined Apr 2006 ·

#484458
GT,Sounds like air pocket around your leads.Make sure all leads are pushed on your coil packs.If one feels like its not pushing on and then pushes back thats you prob. you have a air pocket! Just prick a hole at the end of lead to coil.This realest the air from the connection.JVL

boof2332 Custom Title Time!

1,210 posts · joined May 2004 ·

#485065
When it all went wrong in the beginning..and I mean everything that could of gone wrong did, you become pretty good a diagnostics..... Clean your plugs, they are wet. Too much starting on cold start(really rich) and not running car for any length of time...they foul and when not firing properly just soak.
On these engines always test cylinder activity by removing injector plug, not coil plug, as it too will cause grief.

Matt

boof2332 Custom Title Time!

1,210 posts · joined May 2004 ·

#485067
JVL,

I'm sure he runs on plug coils..there are no leads!

I'm also not going to ask again nicely..WHERE THE HELL IS YOUR CAR???

Has you wife sold it on you...?

Matt:thumb:jesus:thumb bechewychewycharmp

Craig Torrens 6 times Australian, 7 times State Hillclimb Class Champion

8,040 posts · joined Jan 2003 ·

#485115
boof2332 wrote:JVL,

I'm sure he runs on plug coils..there are no leads!

I'm also not going to ask again nicely..WHERE THE HELL IS YOUR CAR???

Has you wife sold it on you...?

Matt:thumb:jesus:thumb bechewychewycharmp
Or maybe the car has been turned into a LAWN MOWER :jesus


GTMac Fahrvergnugen

976 posts · joined Nov 2004 ·

#485247
Turned out to be very wet and fouled plugs, thanks Matt. Yeah has only been idling in garage for last few months and thus plugs looked horrific, well one did and I suppose thats all you need. Yes still running coil packs.
1971 Type 3 Fasty - EJ20T

I love 242HP sleepers. 🤪

How many sets of lights does it take a $229k Carrera S to learn? 😂 UPDATE: Cayman S, M3, B4 now added to the list.

JVLR Slammed & Awesome Dubber

79 posts · joined Apr 2006 ·

#485301
boof2332 wrote:JVL,

I'm sure he runs on plug coils..there are no leads!

I'm also not going to ask again nicely..WHERE THE HELL IS YOUR CAR???

Has you wife sold it on you...?

Matt:thumb:jesus:thumb bechewychewycharmp
Well mister Matt,I run leads:thumb...and air pockets cause these probs:o...Do you nagg your wife the same way?:P

[ Edited on 7-5-2006 by JVLR ]

JVLR Slammed & Awesome Dubber

79 posts · joined Apr 2006 ·

#485302
Craig Torrens wrote:
boof2332 wrote:JVL,

I'm sure he runs on plug coils..there are no leads!

I'm also not going to ask again nicely..WHERE THE HELL IS YOUR CAR???

Has you wife sold it on you...?

Matt:thumb:jesus:thumb bechewychewycharmp
Or maybe the car has been turned into a LAWN MOWER :jesus
:PThanks Craig

JVLR Slammed & Awesome Dubber

79 posts · joined Apr 2006 ·

#485330
GTMac wrote:Turned out to be very wet and fouled plugs, thanks Matt. Yeah has only been idling in garage for last few months and thus plugs looked horrific, well one did and I suppose thats all you need. Yes still running coil packs.
GT,didnt you say you checked the plugs first post!:o

boof2332 Custom Title Time!

1,210 posts · joined May 2004 ·

#487080
I have the same coils and leads as you john, mine have never done this...maybe your leads are loose at the contact point.

Matt

JVLR Slammed & Awesome Dubber

79 posts · joined Apr 2006 ·

#487161
boof2332 wrote:I have the same coils and leads as you john, mine have never done this...maybe your leads are loose at the contact point.

Matt
Nope...Matt the leads were tight,this sought of probs do happen and can be mistaken for a bad plug...........:o

boof2332 Custom Title Time!

1,210 posts · joined May 2004 ·

#487420
When I put the 98 manifold and fuel rails etc on my engine, it took a while to get it running well, then all of a sudden goes ballistic for 3 weeks, then droped off a bit, then blew box. Today as I was always suspicious of this problem, I changed the pressure regulator. The beast is back...possible a bit more responsive than before. Thats probably why the manifold was so cheap on ebay to start with...it was running real lean and melted.

matt

GTMac Fahrvergnugen

976 posts · joined Nov 2004 ·

#487776
GT,didnt you say you checked the plugs first post!:o [/quote]

Yeah I did :o looked OK, bit black but seen worse. Cleaned them anyway and still no good as it really fueled up on the front passenger side. Cleaned again and idled up nicely this time but still missing at higher rpm. Hope plugs are not stuffed completely, over $100 and 2k km old.
1971 Type 3 Fasty - EJ20T

I love 242HP sleepers. 🤪

How many sets of lights does it take a $229k Carrera S to learn? 😂 UPDATE: Cayman S, M3, B4 now added to the list.

boof2332 Custom Title Time!

1,210 posts · joined May 2004 ·

#488246
What kind of miss....intermittent? Lots of causes...a few things first..
Have you used the head cleaning foam from subaru to get rid of all the carbon etc in the intake? have you used the nulon lifter additive? Now it runs o.k. try and come out and see me at the shop, or I will pop by and have a look later next week.

Matt

GTMac Fahrvergnugen

976 posts · joined Nov 2004 ·

#488964
boof2332 wrote:What kind of miss....intermittent? Lots of causes...a few things first..
Have you used the head cleaning foam from subaru to get rid of all the carbon etc in the intake? have you used the nulon lifter additive? Now it runs o.k. try and come out and see me at the shop, or I will pop by and have a look later next week.

Matt
Thanks, Matt. Might try and pop out to workshop or if you have time that would be great as shouldnt really be driving a non engineered car yet!!!! Im actually moving house and car is now at Fairfield, 400m up from where Nationals were. Let me know.

Andrew
1971 Type 3 Fasty - EJ20T

I love 242HP sleepers. 🤪

How many sets of lights does it take a $229k Carrera S to learn? 😂 UPDATE: Cayman S, M3, B4 now added to the list.