cainsw

iTrader: (11)

I have a 98 A4 T/A with the following mods.
98 A4
Patriot 2.02 heads (1998 style)
Comp Cams 228/228 581/581 112
TCI SSF 3600 3.73's
MAC's/ORP
LS6 intake
Ported TB
stock MAF descreened
lid/KnN
all the free mods.

I need some help figuring out why one side is way off from the other side. At idle the ltrims are way off from each other. B2 is @ 10 and B1 is @ -4. The car had a LSX intake on it and I thought that might be the problem so I changed it and put the LS6 intake back on it but it is still off the same as before the swap.

So, I pulled the headers and checked for leaks and that was all good. So I put it back together with new gaskets and it's still the same! I have no idea what the problem is and I don't know where else to look. I do know that as soon as you give it some gas it evens out some. It doesn't get perfectly even but it does get close. Could it be a bad O2? How do you check to see if an O2 sensor is bad?

Also, when I pull up to a stop the car wants to stay idled up high for a few seconds. How do I go about fixing this problem?

FigsZ28

iTrader: (70)

Sounds like B2 is getting unmetered air from somewhere, look for exhast leaks near the collector and make sure your getting a tight seal on the 02. You can check your 02 with edit or HP tuners to see if there switching. If there not then you have a bad 02. Are you throwing any codes??

cainsw

iTrader: (11)

Whats up Dan! Been a looong time. Nope no codes. I've checked everything but the O2's. What do you do to check them?

SilverSmoke

hmmm, i got a similar issue as well. Header bolts tight, don't hear any signs of leakage.... weird. Keep this one up top, I need to find this out too.

02sierraz71_5.3

iTrader: (2)

Ive got a very similar problem except at wot my 02's read 100 mv difference and it causes pinging. Ive swapped 02s and it stays the same. I think mine is injectors though.

If I were you I would swap 02's just to eliminate that. Are they reading the same at wot? Could also try running a can of top engine cleaner with a full tank of gas GM makes some stuff that is great costs about 10 bucks gets rid of carbon also.

FigsZ28

iTrader: (70)

Chris make sure both 02's banks are switching and not stagnent via LS1 edit or HP tuners. If there not start from there. I had the same problem in a 98 A4. It fixed itself when I changed out the 02 extentions (the switching part) Shoot me an IM on AIM when you get a chance.

98Grnz28

iTrader: (7)

mine is doing the same thing.

FigsZ28

iTrader: (70)

also they will almost never be identical readings. Due to the differance's in the exact location of the sensor in each collector. Im guessing theyll be off by 2 or 3

cainsw

iTrader: (11)

I know this is an old thread but after trying everything, I swapped the cam (228/228/588/588/112) for a small cam(222/222/561/561/112)
The LTRMS are dead on now.

How could the cam cause this? Like I said, everything had been changed except the cam, so it had to be the cam, I guess