EGR 89GT bypass [tru cold air]

Post information about intake systems. Either purchased or custom made
User avatar
yellow3800
Registered User
Posts: 255
Joined: Tue Jan 15, 2002 10:00 am
Location: Maryville, TN
Been thanked: 1 time
Contact:

EGR 89GT bypass [tru cold air]

Postby yellow3800 » Sun May 10, 2009 11:21 am

I plugged the vacuum line going to my vacuum style EGR valve in attempt to raise combustion temperatures [by cold air intake] for greater efficiency.

MY OXY SENSOR code 13 is cycling on/off while driving at 50mph every ... seems like a fixed time interval... stays on for some seconds [prob not over a min, but could be close to] and stays off for a while... returns... repeats

I'm running NON alcoholic 87 octane [texaco sells this for those of you non turbo high compression people].

my question is, since my o2 sensor is older... [mid life, 8k mi on it] is it going out?
should my ecu need modifying/replacing?
is the o2 signal off the map now due to egr bypass?

I wonder if I can put a bosch sensor in there... but if its off the computer map, then it won't make a difference, which is why I post here...

Where is the info on bypassing this?

Andy <--- surely not the first to do this



User avatar
IsaacHayes
Registered User
Posts: 975
Joined: Fri Oct 07, 2005 8:32 pm
Location: Missouri

Re: EGR 89GT bypass [tru cold air]

Postby IsaacHayes » Sun May 10, 2009 1:27 pm

Blocking the EGR shouldn't affect the O2 at all.

Don't get Bosch sensors they aren't good. Go with Denso or AC Delco. www.sparkplugs.com has Denso for cheap, is where I got mine.

Check the wires going to the O2, maybe it's as simple as a broken wire or something.


Image Image 2010 project (click pic)
1994 3100 BERETTA. 200,000+ miles.
16.0 @ 84.41mph when stock. Now ???
Original L82 w/LA1, LX9, & LX5 parts!!!

soon to be OBD1 tuned...

User avatar
Bandit
Registered User
Posts: 166
Joined: Fri Nov 18, 2005 2:14 pm
Location: Jackson Mi

Re: EGR 89GT bypass [tru cold air]

Postby Bandit » Sun May 10, 2009 9:46 pm

yellow3800 wrote:I plugged the vacuum line going to my vacuum style EGR valve in attempt to raise combustion temperatures [by cold air intake] for greater efficiency.

MY OXY SENSOR code 13 is cycling on/off while driving at 50mph every ... seems like a fixed time interval... stays on for some seconds [prob not over a min, but could be close to] and stays off for a while... returns... repeats

I'm running NON alcoholic 87 octane [texaco sells this for those of you non turbo high compression people].

my question is, since my o2 sensor is older... [mid life, 8k mi on it] is it going out?
should my ecu need modifying/replacing?
is the o2 signal off the map now due to egr bypass?
I wonder if I can put a bosch sensor in there... but if its off the computer map, then it won't make a difference, which is why I post here...

Where is the info on bypassing this?

Andy <--- surely not the first to do this



The o2 sensor has nothing to do with the MAP sensor. The o2 simply reads the amount of un-burned fuel in the exhaust to adjust A/F ratio accordingly. Now, I could see blocking off the EGR causng a MAP sensor light due to the fact that you don't have exhaust gases traveling into the intake anymore.


SIDE NOTE --- if you are trying to make a "true cold air intake" did you already bypass the coolant lines running into the T/B? Otherwise blocking off the EGR did no real gain if you still have coolant lines hooked up to your T/B.


- Ryan -
1987 Jeep Wrangler 4x4
1995 Chevy S10 Ext. Cab 4x4

User avatar
IsaacHayes
Registered User
Posts: 975
Joined: Fri Oct 07, 2005 8:32 pm
Location: Missouri

Re: EGR 89GT bypass [tru cold air]

Postby IsaacHayes » Sun May 10, 2009 10:12 pm

I think he means by "off the map" like "off the charts" "way off reading" etc...

And since the older ones were vacuum only I don't think you will even get a check engine light. Now something like a 3100 will know if it's not flowing even due to a blocked passage AFTER the EGR!! It does read the MAP and expect a change when it opens the EGR.


Image Image 2010 project (click pic)
1994 3100 BERETTA. 200,000+ miles.
16.0 @ 84.41mph when stock. Now ???
Original L82 w/LA1, LX9, & LX5 parts!!!

soon to be OBD1 tuned...

User avatar
Bandit
Registered User
Posts: 166
Joined: Fri Nov 18, 2005 2:14 pm
Location: Jackson Mi

Re: EGR 89GT bypass [tru cold air]

Postby Bandit » Mon May 11, 2009 11:24 pm

Yea, now that I read that again I see that. When I read it the first time I thought he meant his MAP sensor. Not "off the map" LOL Oops.... :oops:


- Ryan -
1987 Jeep Wrangler 4x4
1995 Chevy S10 Ext. Cab 4x4

User avatar
Money pit Beretta
Registered User
Posts: 6362
Joined: Thu Jul 26, 2007 11:36 am
Location: Kansas
Has thanked: 2 times
Been thanked: 9 times

Re: EGR 89GT bypass [tru cold air]

Postby Money pit Beretta » Tue May 12, 2009 1:47 am

Not to be a jerk, but the older cars didn't have coolant lines to the TB. :)


keep'em flying!

User avatar
Cliff8928
Administrator
Posts: 1774
Joined: Wed Mar 03, 2004 10:03 pm
Location: Long Grove, IL
Has thanked: 8 times
Been thanked: 10 times
Contact:

Re: EGR 89GT bypass [tru cold air]

Postby Cliff8928 » Tue May 12, 2009 2:02 am

Yes they do....



Ninety1BerettaGT
Registered User
Posts: 21
Joined: Mon Feb 09, 2004 4:58 am
Location: Middletown, New Jersey
Contact:

Re: EGR 89GT bypass [tru cold air]

Postby Ninety1BerettaGT » Tue May 12, 2009 8:10 am

Yes they do, and simply plugging off the EGR's vacuum will not create a colder intake charge. The exhaust gas still heats up the EGR tube to the exhaust manifold and in turn heats the aluminum EGR valve base, which will still heat the intake manifold.

I'm no tree hugger, but it's put there for a reason, you should be using it.


Rob
'91 Beretta GT 3400 5 Speed
3400's Best 1/4 Mile
R/t .506
60' 2.195
330' 6.138
1/8 9.390 @ 76.48
1000' 12.183
1/4 14.553 @ 94.01

User avatar
Styluss
Global Moderator
Posts: 1915
Joined: Tue Jan 24, 2006 6:48 pm
Location: Lakewood, Colorado
Has thanked: 9 times
Been thanked: 6 times
Contact:

Re: EGR 89GT bypass [tru cold air]

Postby Styluss » Tue May 12, 2009 9:45 am

Just to clarify, YES, older models have the coolant lines on the throttle body. I removed it on my '89 and have yet to do it on my '90. And as far as I know... removing the EGR will do nothing for performance.


BFest 2013: Denver Colorado Host & Committee Member
Winner: Best Custom Late Model Interior
Gopher Award - Tin Foil Award - Banner!

User avatar
IsaacHayes
Registered User
Posts: 975
Joined: Fri Oct 07, 2005 8:32 pm
Location: Missouri

Re: EGR 89GT bypass [tru cold air]

Postby IsaacHayes » Tue May 12, 2009 10:40 am

1994 3100's don't have it though. :D


Image Image 2010 project (click pic)
1994 3100 BERETTA. 200,000+ miles.
16.0 @ 84.41mph when stock. Now ???
Original L82 w/LA1, LX9, & LX5 parts!!!

soon to be OBD1 tuned...

Ninety1BerettaGT
Registered User
Posts: 21
Joined: Mon Feb 09, 2004 4:58 am
Location: Middletown, New Jersey
Contact:

Re: EGR 89GT bypass [tru cold air]

Postby Ninety1BerettaGT » Tue May 12, 2009 12:29 pm

I'd also like to point out, blocking off the EGR as per the service manual ...

Beretta Service Manual wrote:Too little or no EGR flow allows combustion temperatures to get too high. This could cause : Spark knock (detonation). , Engine overheating. , and Emission Test Failure.


Aka blocking it off, does exactly the opposite of what you wanted to achieve.



User avatar
Money pit Beretta
Registered User
Posts: 6362
Joined: Thu Jul 26, 2007 11:36 am
Location: Kansas
Has thanked: 2 times
Been thanked: 9 times

Re: EGR 89GT bypass [tru cold air]

Postby Money pit Beretta » Tue May 12, 2009 12:34 pm

I could swear that my old 90GT didn't have the lines.


keep'em flying!

User avatar
3X00-Modified
Administrator
Posts: 10672
Joined: Thu Jul 05, 2007 9:18 am
Location: Plainfield CT
Has thanked: 12 times
Been thanked: 46 times

Re: EGR 89GT bypass [tru cold air]

Postby 3X00-Modified » Tue May 12, 2009 2:50 pm

IsaacHayes wrote:1994 3100's don't have it though. :D


94-95 lacked them 96 they came back.



#1 stunna
Registered User
Posts: 180
Joined: Mon May 04, 2009 5:29 pm
Location: Newnan,GA

Re: EGR 89GT bypass [tru cold air]

Postby #1 stunna » Tue May 12, 2009 6:24 pm

Doesn't the EGR only operate until the motor gets warm anyhoo?


88 beretta
http://www.cardomain.com/ride/517217
03 monte carlo ss

User avatar
IsaacHayes
Registered User
Posts: 975
Joined: Fri Oct 07, 2005 8:32 pm
Location: Missouri

Re: EGR 89GT bypass [tru cold air]

Postby IsaacHayes » Tue May 12, 2009 7:13 pm

It operates at partial throttle at like cruise mainly highway speeds. And when slowing down to around 40 I think it opens then too.


Image Image 2010 project (click pic)
1994 3100 BERETTA. 200,000+ miles.
16.0 @ 84.41mph when stock. Now ???
Original L82 w/LA1, LX9, & LX5 parts!!!

soon to be OBD1 tuned...


Return to “Intakes”

Who is online

Users browsing this forum: No registered users and 3 guests