Rich on bank 2 only
Rich on bank 2 only I got my motor all together and bank to keeps dumping fuel. LTFT on bank 2 are 25%, while bank 1 is good at -3%.
I tried swapping out the o2's, checked if my injectors were leaking by pulling them out and leaving the key on, new iridium tr55's gapped to .45, also installed new intake gaskets. Any other ideas?
I tried swapping out the o2's, checked if my injectors were leaking by pulling them out and leaving the key on, new iridium tr55's gapped to .45, also installed new intake gaskets. Any other ideas?
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Process of elimination. Are you getting any other DTCs? What are you Freeze Frames? Are they out of bounds? MAF seems unlikely to effect one side only. Did you use a new intake gasket? Is it sealing properly on Bank2? If you have a vacuum leak on Bank2 you that will cause you to go RICH.
No DTCs, freeze frames? aren't those when DTCs are set?
New intake gaskets for both banks and no vacuum leaks that I can hear...car is too damn loud. There really isn't that many vacuum lines on these cars, just brake booster line, pcv lines, and some small line that goes to the pass. side.
New intake gaskets for both banks and no vacuum leaks that I can hear...car is too damn loud. There really isn't that many vacuum lines on these cars, just brake booster line, pcv lines, and some small line that goes to the pass. side.
Originally Posted by 10SecDreamer
could it be maf related? for one bank?
I have the 85 mm garnatili maf, should I try a stocker?
I have the 85 mm garnatili maf, should I try a stocker?
12 Second Club
Joined: Mar 2003
Posts: 334
Likes: 0
From: jonesville, MI
Any missfires on bank #2? The positive 25% would indicate that the fuel trim is actually lean and causing the PCM to add fuel by lengthening the injector pulse width. A leaking injector would cause a negative fuel trim and cause the PCM to subtract fuel. If you look at the bank 2 injector pwm milliseconds with the +25%, they will be noticeabley more than bank #1. So, in short, you could have a fuel restriction on bank 2, a vacuum leak (unmetered air), a faulty HO2 sensor or wiring, etc. What is the bank 2, sensor 1 HO2 sensor reading?
Can't read to much with my scan tool from work. I only read volts for 02s and bank2 sensor1 was reading around .800
Also read no missfires but would like to see which cylinder is using all that fuel. Does the pcm equally change all cylinders on bank2 to add 25% more fuel? Gas mileage sux even on the highway.
Also read no missfires but would like to see which cylinder is using all that fuel. Does the pcm equally change all cylinders on bank2 to add 25% more fuel? Gas mileage sux even on the highway.
I assumed you had a DTC that pointed you to Bank 1. If not you must have been logging. You right about the noise factor. It makes it nearly impossible to hear a vacuum leak. I was thinking more about a leak at the intake manifold rather than a hose or a rubber barb cap which would effect both banks. Do you have EFI Live or AutoTap or EASE software to monitor your sensors. I'd use that as a starting point.
TECH Resident
Joined: Aug 2003
Posts: 970
Likes: 4
From: England UK
Originally Posted by vettenuts
Had this problem, tried new O2, etc. Check vacuum lines, EVAP as they can cause this.
Mine turned out to be the MAF calibration in the tune.
Mine turned out to be the MAF calibration in the tune.
If there are no misfires. then are the rear O2's reading approxmiately the same as the front O2. the rear onse wont switch like the front one, but if simular voltage to the fonts then their must be extra fuel entering that bank. If front O2 is way off to rear, then possibly faulty O2.
Anyway just wanted to say I wouldn't think its the MAF.
I'm just telling you guys I chased a bank 1 issue for months, turned out to be the MAF calibration. I looked at all the typical suspects, even resorted to changing the O2 on bank 1. If he has the stocker, why not just plug it in and see if the problem goes away. The Granatelli has caused a lot of problems.
Teching In
Joined: Jun 2007
Posts: 34
Likes: 0
From: Mooresville NC NASCAR Country
Intake Gasket check A quick way to check for a intake gasket leak is to have a friend spray a small amount of choke cleaner very close to the edge of the intake & head as you look at your STFT.If it changes at all this would lead you to your problem.I have found diffrent vacuum leaks this way in about 2-3 minutes on an engine.It could be as easy as a loose intake bolt to a gasket that moved during install.Hope this helps
I changed intake gaskets and replace egr/air gaskets cause I found a leak around them.
It doesn't use as much gas as it used to so I'm thinking its fixed but still runs real rough on cold start up. Might just need a tune, I'll get it checked out next week.
It doesn't use as much gas as it used to so I'm thinking its fixed but still runs real rough on cold start up. Might just need a tune, I'll get it checked out next week.
