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Unread 05-24-2013, 08:08 PM   #1
Maximous
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Emissions problem, Ripp supercharger/Headers (See Post #23 For Important Info!)

Looking for a bit of help.

My Jeep configuration is:

2010, 2 Door Jeep JK, Manual trans, 4:88 gears 35” tires, Ripp Supercharger, stage II (meaning with the intercooler) long tube headers also from Ripp and Borla cat back.

The problem I am having is that the Jeep will not pass New Hampshire state emissions. No Check engine light but the following codes:

P0171 bank 1 fuel system too lean
P0174 bank 2 fuel system too lean

In looking into the codes it appears to be saying the downstream O2 sensors are not efficient.

I don’t know exactly what this means.

I initially requested help from Ripp. They advised me to update to the newest software. This was a bit of a problem because both my version and programmer version were out of date. The Diablo guys were especially helpful with this and eventually they walked me through everything and I got the Jeep up to date and I do believe it runs a bit better than it did with my previous version. I was at 2.6, updated to 3.3.

At the time the guys at Ripp told me I needed to run it a bit before again testing the emissions which was a couple weeks ago and I have put maybe 500 miles on it since. Still will not pass. Codes will come back if I clear them. I have requested help or at least some direction from the Ripp guys but have heard nothing back. Mike at Diablo has tried to help in telling me that he thinks it is likely a leak in the intake system. I spent time looking at this today but found no problems or leaks anywhere in the intake.

I have about 39000 on the Jeep, roughly 20k of that is with the supercharger and exhaust from Ripp. I have never previously had a problem passing emissions and after some early problems the Jeep has generally run very good. Fuel milage was initially 16ish after the install but dropped to 13.5-14 by the time I got to the 2.6 tune. Mileage has never been a big concern.

In researching the codes, they pointed me to the downstream O2 sensors, the cats or an exhaust leak. I have thoroughly gone through the exhaust and intake systems for leaks…no problem found. I have checked the O2 wiring and connectors for any issues related to heat or damage from touching pipes and such. All appear to be good. The Diablo tuner allows me to look at the sensors live and they appear to be working. The cats/Y pipe have only 20kish on them so I would not think they are bad. I have asked Ripp if there is any known issue but no response from them so I’d like to know if any of you other guys with this set up have had any issues of the like?

I’d normally take it to the dealer as emissions issues are generally covered for a long time on new vehicles but this having all the add on I can’t do so without paying for hourly labor…potentially a lot…I sought guidance from Ripp and they were a bit impatient with me just with the tune and no response at all this week when writing that I still have a problem. I don’t think it has anything to do with the supercharger but I am also using their cats and tune.

I’m getting desperate here… pulled over twice today by police from 2 different towns!!

Anyone have any experience with this kind of issue? Any ideas? I just don’t know where to go next in troubleshooting it. Any advise or ideas would be greatly appreciated.

Thanks,

V

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Unread 05-24-2013, 08:33 PM   #2
RockyClymer
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Have you thought about putting the stock belt back on and running it in stock mode? Or even the stock belt and restoring the original tune from the Diablo? Then the SC is not in the system....this is one of the advantages of the Vortech unit, it will pass air even when not running.
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Unread 05-24-2013, 08:40 PM   #3
Maximous
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fair question... I have not considered it though if I thought it would get me past the inspection I would do it. I don't think the SC is the issue though....
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Unread 05-24-2013, 09:20 PM   #4
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Your running lean. P0171,174 is generic OBD II's way of telling you you have reached your adaptive lean limit. The PCM has reached it's limit (about 30%) of additional fuel supplied.

Too much air or too little fuel will cause this condition. The wrong fuel (E85) will cause these codes. Improper calibration, especially MAF based operating systems will cause these codes. Your JK is speed density so no problem there.

Log long term fuel trims LTFT's bank 1 and 2 upstream. B1S1 and B2S1. It is important they run close to 0 as possible. If you get in the +/- 20's something is wrong. Intake leak, low fuel pressure, etc. Identify the problem and get LTFT's close to 0 and your codes will go away. Ignore STFT's short term fuel trims they don't mean a lot.
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Unread 05-24-2013, 09:27 PM   #5
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What's your AFR at? Is it possible that your tune is simply not commanding enough fuel and your o2s are reading the lean condition?
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Unread 05-24-2013, 09:35 PM   #6
HappyTrails
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Sounds like an air leak somewhere or maybe need to change fuel filters. Is everything properly connected and secure?
I translated Mechanic-speak from VEGASROBBI.
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Unread 05-24-2013, 09:42 PM   #7
tjkj2002
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Quote:
Originally Posted by HappyTrails View Post
Sounds like an air leak somewhere
Yep what P0171/P0174 are 99.99% caused by,meaning a intake leak before the combustion chamber.
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Unread 05-24-2013, 09:46 PM   #8
Maximous
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OK, you guys mean where? I checked upper plenum and TB, all seems ok. I'll pull it all apart and check further as needed but where have you seen this? There does not appear to be many places it can leak? Meaning a vacuum leak? Info is much appreciated! Keep the ideas coming!
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Unread 05-24-2013, 09:52 PM   #9
bondosgto
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Have you pressure.tested the sc system (post.super charger)?
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Unread 05-24-2013, 09:55 PM   #10
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Assuming it's not your RIPP S/C or tune...

Here is a list of possible causes for your codes, (from the factory service manual).
The list of things to check under these headings, especially Engine Mechanical, is very long.

Possible Causes

RESTRICTED FUEL SUPPLY LINE

FUEL PUMP INLET STRAINER PLUGGED

FUEL PUMP MODULE

O2 SIGNAL CIRCUIT

O2 RETURN CIRCUIT

O2 SENSOR

MAP SENSOR

ECT SENSOR

ENGINE MECHANICAL

FUEL FILTER/PRESSURE REGULATOR

POWERTRAIN CONTROL MODULE (PCM)
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Unread 05-24-2013, 10:01 PM   #11
RockyClymer
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I known leak location is at the EGR connection to the plenum...might want to recheck that connection and gasket...just another 2 cents to the pot.
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Unread 05-25-2013, 08:10 AM   #12
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^^X2. Also, did you torque the plenum too much or too little? And did you use the correct tightening sequence?

One of my plenum rings/rubbers/gaskets was torn and replaced all with new set from dealer ($50).

Just some ideas...

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Unread 05-25-2013, 08:16 AM   #13
Maximous
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OK, Thanks for all th suggestions I'll give it a shot today. I'll start with the EGR connection, I know specifically where you guys mean. If that does not work I'll R&R the upper plenum seals.

Thanks,

Verne
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Unread 05-25-2013, 09:07 AM   #14
mello
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Your codes are not for downstream it is for upstream 02 sensors they are both reading lean. What the above posts have told you is all great info. Sounds like you have a vacuum leak somewhere or low fuel pressure. It has to be something that effects both banks of the engine. Doing a smoke test on intake or spraying the intake down with brake clean only on a cold motor are both good ways of finding vacuum leaks. Don't attempt to spray brake clean on hot motor because you could start a fire.
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Unread 05-25-2013, 11:36 AM   #15
222Doc
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have a fire extinguisher ready as well. Brake cleaner is acetone. any spark or ignition source will make it into a roman candle.
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