Tuning issues...L Trim and S Trim.
08-14-2012, 09:09 PM
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Tuning issues...L Trim and S Trim. Ok, so working on my tune I was datalogging in datamaster. I was watching my L and S trims while I was idling....my Drivers side L Trim sits at +1.6 steady...my Pass side L Trim is almost always sitting at +18. Can someone PLEASE translate for me and tell me what the cause could be?
08-15-2012, 02:09 PM
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the passenger side is running too lean at idle driver side is ok at +1.6. check to make sure all your spark plug wires are good and you have no vacuum or exhaust leaks on the passenger side. i had a similiar issue and it was due to a bad plug wire.
08-15-2012, 04:39 PM
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I searched split BLM's and my IAC was WAY off...it was at 160 (wide open) and my idle had been giving me trouble. I adjusted the Stop Screw on my TB and modified the TPS and it runs MUCH better now once I got the IAC Position down to ~45 at 0% TPS...HOWEVER, my BLM's were still split. So that wasn't it. I do not hear, feel, or see ANY exhaust leaks at the header gasket and there is no other place for a leak between the block and my O2. Also under casual driving the BLM's even out.
I was still getting 12* of Knock Retard at idle dipping down to ~8 or 9 once in a while with the Spark Advance set at 32*, so I was sitting right around 20* of timing at idle with the retard...SO, I wanted to see if it would change...I dropped the Closed TPS Spark Advance to 20* and I dropped the Main Spark Advance for the ranges where I idle (50-70 kPa and 600-1000 rpms) down to 20*. Reflashed and cranked her up...Idled fine but Knock Retard was STILL at 12* dipping to ~8 or 9, so timing was right around 7* to 10* at idle. BUT, I let it idle for a minute because I saw that my BLM's had evened out!!! BEFORE I dropped the timing, my BLM's sat at 129L and 143R...This time they were BOTH at 124 and didnt move at all. I let it run for a good 10 minutes and no change.
Is it possible that I am experiencing reversion at the higher Spark Advance, or that I am losing vacuum? All SP wires are good, there is no misfire, I cant find any exhaust leak, O2 sensor is reading, I do not see or hear any vacuum leaks on the outside, kPa is right at 85 with the engine off and at 84 at WOT so I am not sensing a vacuum leak in my datalogs either...at Idle my kPa bounces between 55 and 65 kPa. Brakes work great as well. Thoughts?
I was still getting 12* of Knock Retard at idle dipping down to ~8 or 9 once in a while with the Spark Advance set at 32*, so I was sitting right around 20* of timing at idle with the retard...SO, I wanted to see if it would change...I dropped the Closed TPS Spark Advance to 20* and I dropped the Main Spark Advance for the ranges where I idle (50-70 kPa and 600-1000 rpms) down to 20*. Reflashed and cranked her up...Idled fine but Knock Retard was STILL at 12* dipping to ~8 or 9, so timing was right around 7* to 10* at idle. BUT, I let it idle for a minute because I saw that my BLM's had evened out!!! BEFORE I dropped the timing, my BLM's sat at 129L and 143R...This time they were BOTH at 124 and didnt move at all. I let it run for a good 10 minutes and no change.
Is it possible that I am experiencing reversion at the higher Spark Advance, or that I am losing vacuum? All SP wires are good, there is no misfire, I cant find any exhaust leak, O2 sensor is reading, I do not see or hear any vacuum leaks on the outside, kPa is right at 85 with the engine off and at 84 at WOT so I am not sensing a vacuum leak in my datalogs either...at Idle my kPa bounces between 55 and 65 kPa. Brakes work great as well. Thoughts?
