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RPM-Motorsports LE5 Turbo Install Idle Issues, Running Lean,
For background, I have a 30k mile 07 Saturn Sky 2.4 with an RPM turbo kit on it, and have been going back and forth with Martin at RPM to dial in my tune. I had a performance engine builder do my turbo install, but seeing as I currently work in the automotive industry and have dug around trying to find the source of the problem, I am pretty familiar with the system as a whole now.
I have my theories as to what the issue could be (exhaust leak, intake leak, faulty MAF connector). I've already tried the following and they haven't seemed to cure my cars problems:
1. tightened down the down pipe to exhaust at the downstream o2 sensor to crush the donut gasket better
2. Tuned the car to command a rich AFR so I know that there's not a true lean condition
3. listened all over the engine bay for leaks and can't hear anything.
4. checked the vacuum on my gauge (20 in/Hg at idle)
5. checked the intake system with a smoke machine and didn't see any smoke coming out and checked it with a propane torch while the car was running to insure that I don't have a vacuum leak (there could be one, but to the best of my ability, there isn't).
6. checked the evap purge solenoid (no leaks in the solenoid or the vacuum line to the manifold)
7. purchased a new OEM MAF and made sure the seal was air tight.
8. Pulled the injectors and greased the o-rings on the collars and on the injectors They had small dark spots around the injector seat, so I cleaned them up but took pictures if anyone wants to see.)
9. pulled the 2 bar MAP sensor and greased that o-ring as well.
I have noticed that when I unplug the MAF, the car actually seems to want to start up quickly and run smoothly, and I don't get a p0171 lean code or corrections to my fuel trims and I don't get a random misfire code. I don't have a wideband on the car yet, but I'm planning on adding that this week. I've uploaded the datalogs (with descriptive names) and the tune file that I'm currently running I'd love for someone else to look at them and see if they can spot an issue that might point me in a good direction. I'm getting a little frustrated with no more progress made on what could possibly be causing the car to think it's running ultra lean on idle and think it's running rich under boost.
With the MAF sensor plugged in, the spark* is constantly jittering around and making the car stutter, and whenever I come to a stop, the rpms drop to 400 making the car seem like it wants to die before jumping back up and idling around 800
I made the mistake of reading through the Terminator Tune thread where the dude ragged on his car and blew his engine and hopefully that doesn't become me I drive my car very carefully while constantly monitoring temps and KR, and I haven't gone WOT or even got over 5psi yet from fear of causing some damage.
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I'm trying to help you by helping myself
Quote:
Originally Posted by
Engnineere
I'm not sure why I'm only just now seeing this, but I sincerely appreciate the suggestions. I know it's really easy for people like me to start blaming a bad tune especially when I didn't create/calibrate it originally, but I have so many questions about why the tune acts so weird from just a vacuum leak and why it started and ran so different when I forced the car (albeit not very safely) into the open loop by unplugging the MAF.
I changed some of my vacuum routing, and surprisingly the P0171 lean DTC disappeared and hasn't come back, but the MAF table is still showing that crazy gradient from +19.5% LTFT at idle and very low speed/load up to -7% at high speed/boost/load.
I'm thinking I need to do the AFR/MAF calibration since my current calibration is just a fuel trim / MAF calibration +10% fuel across the board.
Another thing that seems wrong to me is that my flow rate vs. pressure tables on 60lb injectors (although my tuner says they act more like 53lb on the LE5 ecotec) looks like this, and I have confirmed to have 60psi static and running fuel pressure, but still takes forever to crank and idles like raw garbage unless I blip the throttle.
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I sincerely appreciate your help.
Well, first let me say that I give you a great deal of credit if you have been able to get Martin to work with you on your tune. I purchased his stage 2 kit and received one "preliminary tune" and a single "v1 tune". I have asked for help, but no response.
I would like to help you in any way I can (I would be helping myself too). And I have notice a TON of differences in the two tunes (my V1 to your V9) that I am speechless. I will tell you that if you received the ZZP injectors with your kit, then you table is much different than mine....
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I will be more than willing to share my tune with you...
I don't have an idle issue and I am not running lean...
But I do get a miscellaneous misfire P0300 and I do have issues at wide open throttle as far as performance..
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I agree that we have an issue with the injector data !
I will check what I am running on my tune, but I have the opposite problem... I'm running too rich at idle .85 lambda and could use just a tiny bit more fuel at power...
But take a look at this... I found it on a tuner web site... trying to remember which one, but he seem to know what he was saying... I started using it and it definitely improved my drive-ability and power...
Tell me what you think...Attachment 115526