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Old 05-11-2009, 04:07 PM   #1
oldspice
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Member#: 193976
Join Date: Nov 2008
Chapter/Region: NWIC
Vehicle:
94 Impreza L
Green FTW

Default EJ20G problems... Weird Noses...

SO I picked up my first Subaru a couple of weeks ago and havent looked
back, but a weird noise started happening a few days ago and I dont know whats wrong.

Heres the specs.

EJ20G from 94 STI type RA
6K ecu
GDB Coils
fmic
TD04 (I realize its not the right turbo, should be a TD05)
15psi for boost
Fujitsubo exhaust
No name DP and cat


The problem is that a noise can be heard while driving the car.
Below 3k rpm there is no noise even when the boost is around a .5 bar,
but as soon as I reach 3k rpm there is a slight pinging noise, but it only
makes the noise if there is 0psi of manifold pressure or more not if there
is vacuum. Its not a knock, I know because its not consistant with the rpms.
Id be at 4k rpms and its the same as if I were at 3K.

Maybe a ping from pre-ignition? I can only get my hands on 92oct here.
Maybe a bad fuel pressure regulator? All the vacuum lines are intact.
Maybe a bad O2 sensor?

If anyone has any information that would be helpfull!!! Im new to the subie world.


Thanks in advance.

-Ian
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Last edited by oldspice; 05-11-2009 at 04:27 PM.
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Old 05-11-2009, 07:07 PM   #2
rob
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Join Date: Jan 2000
Location: WA
Vehicle:
2000 RS-Ej20G
It tastes like burning

Default

Quote:
Originally Posted by oldspice View Post
SO I picked up my first Subaru a couple of weeks ago and havent looked
back, but a weird noise started happening a few days ago and I dont know whats wrong.

Heres the specs.

EJ20G from 94 STI type RA
6K ecu
GDB Coils
fmic
TD04 (I realize its not the right turbo, should be a TD05)
15psi for boost
Fujitsubo exhaust
No name DP and cat


The problem is that a noise can be heard while driving the car.
Below 3k rpm there is no noise even when the boost is around a .5 bar,
but as soon as I reach 3k rpm there is a slight pinging noise, but it only
makes the noise if there is 0psi of manifold pressure or more not if there
is vacuum. Its not a knock, I know because its not consistant with the rpms.
Id be at 4k rpms and its the same as if I were at 3K.

Maybe a ping from pre-ignition? I can only get my hands on 92oct here.
Maybe a bad fuel pressure regulator? All the vacuum lines are intact.
Maybe a bad O2 sensor?

If anyone has any information that would be helpfull!!! Im new to the subie world.


Thanks in advance.

-Ian
Where are you in NW? There are few places in WA to get higher octane. I would try a tank of something higher than 92 and see if it changes behavior. At least that way you can isolate bad ignition related noises to the hundreds of other possible noises.

-Rob
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Old 05-12-2009, 01:29 AM   #3
oldspice
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Join Date: Nov 2008
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94 Impreza L
Green FTW

Default

Im in Magnolia. I messed around with the vacuum line to the fuel pressure regulator and it seems to have made it better but not fixed. The line was teed at one point for the boost gauge, I removed that portion of vacuum line.
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Old 05-12-2009, 02:02 AM   #4
dye4life330
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Location: SO-CAL
Vehicle:
SOLD RHD STI-RA
05 Nissan Frontier CC

Default

if this is a japanese cars engine u can NOT run this car on any american gas without the proper tune... i know because i just bought a 95 RA and am getting tuned soon for 91... a tune should fix your problem if your not already tuned

edit: could be detonation idk though... but a tune should fix this or at least help you figure it out
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Old 05-12-2009, 11:40 AM   #5
oldspice
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Green FTW

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Quote:
Originally Posted by dye4life330 View Post
if this is a japanese cars engine u can NOT run this car on any american gas without the proper tune... i know because i just bought a 95 RA and am getting tuned soon for 91... a tune should fix your problem if your not already tuned

edit: could be detonation idk though... but a tune should fix this or at least help you figure it out
Other than going standalone I don tknow anyone around that can tune it... Maxwell Power Services is near by but after talking to Dom, he can't tune this old of a car.

Down in Auburn there is a Trick Racing Fuel station. Ill have to go there tomorrow.
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Old 05-12-2009, 12:35 PM   #6
theonlygreat
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Location: Seattle, WA
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Quote:
Originally Posted by dye4life330 View Post
if this is a japanese cars engine u can NOT run this car on any american gas without the proper tune... i know because i just bought a 95 RA and am getting tuned soon for 91... a tune should fix your problem if your not already tuned

edit: could be detonation idk though... but a tune should fix this or at least help you figure it out
This is not true. I run my 95 EJ20G on 92 octane and it runs great. No tune, stock Z4 ecu. I'd check the things that are commonly wrong with peoples swaps, like vacuum leaks. If the car isn't running any different and it is just a noise, I'd probably take a look at the exhaust system. Especially if the turbo has been changed.
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Old 05-12-2009, 12:40 PM   #7
rob
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It tastes like burning

Default

Quote:
Originally Posted by oldspice View Post
Other than going standalone I don tknow anyone around that can tune it... Maxwell Power Services is near by but after talking to Dom, he can't tune this old of a car.

Down in Auburn there is a Trick Racing Fuel station. Ill have to go there tomorrow.
I can do chip tunes for the early ECUs. Do some searches on my user name for more info. I am down in Edgewood which is about 10 min south of Auburn. Send me an email if you want to talk more. The Cenex in Auburn is where you can pick up 94. Try that first and if it goes away, then it is probably over advanced ignition timing.

-Rob
rob.files @ gmail.com

Last edited by rob; 05-12-2009 at 04:03 PM.
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Old 05-12-2009, 12:52 PM   #8
oldspice
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Green FTW

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Where is the Cenex in Auburn. Im from Federal Way so I know my way around Auburn/Kent very well...

Rob- Do you work at a shop? Or is it something you do in your spare time?
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Old 05-12-2009, 01:16 PM   #9
rob
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Member#: 811
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2000 RS-Ej20G
It tastes like burning

Default

It's just off of 18.
http://maps.google.com/maps?f=q&sour...3&z=13&iwloc=C

It's completely on the side. I am an electrical/computer engineer by trade, and the car stuff is for fun in my spare time.

-Rob
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Old 05-12-2009, 03:22 PM   #10
oldspice
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Green FTW

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Cool... Ill try that tonight...

Rob- Seeing as you seem to know a lot about EJ20G. If the higher octane doesnt fix the issue would you mind taking a look at it in person?
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Old 05-12-2009, 06:26 PM   #11
oldspice
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94 Impreza L
Green FTW

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I changed the vacuum line from the throttle body to the fuel pressure regulator because the previous owner had teed the line for a boost gauge. Its seemed to help it out a bunch. the noise is barely noticeable now...
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Old 05-13-2009, 04:25 PM   #12
dye4life330
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05 Nissan Frontier CC

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Quote:
Originally Posted by theonlygreat View Post
This is not true. I run my 95 EJ20G on 92 octane and it runs great. No tune, stock Z4 ecu. I'd check the things that are commonly wrong with peoples swaps, like vacuum leaks. If the car isn't running any different and it is just a noise, I'd probably take a look at the exhaust system. Especially if the turbo has been changed.
doesnt mean something isnt going to happen. ask anyone... if the car is not tuned for the gas its running on then there can be serious problems like knock and detonation.

try a 50/50 mix of 91 or 93 with 100 UNleaded because u most likely have cats.

if that helps then its your tune most likely
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Old 05-13-2009, 06:04 PM   #13
oldspice
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Yea... Ill have to try that out a bit... I just dont have the money currently to buy even gas...lol...


PS... Planet Eclipse is better than Dye...
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Old 05-17-2009, 06:05 PM   #14
scrappydoo
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97 v4 STi RA
Feather White, 02 WRX MBP

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I've got a 97 sti ra and even using cenex it still pulled timing. I had to bite the bullet and go with a Hydra, which was a huge pain in the ass. Now that all the bugs are worked out I love it, but it's not worth the hassle when you've got other options.
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