When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I have a DBW LM7 swapped into my '66 Skylark and had the PCM tuned remotely. After a number of tries and sending logs back and forth it's running pretty well. When I first tried the final/current tune the car would idle in and our of gear fine, but bog as I coasted to a stop in gear and die sometimes. I did an idle re-learn and it seemed to improve (still bogged a little but stopped dying).
The car sat for two weeks and when I went to leave home it started doing it again, which I thought was strange. I had not done anything to the car or disconnected the battery.
I did another idle relearn and it got better but still bogs and sometimes sounds like it's going to die as I coast to a stop.
I took a quick log just going back and forth in the long part of the driveway in drive and reverse before the latest relearn, which I've attached. I've also attached my tune.
I've read a couple of posts about an idle table that sometimes needs to be put back to stock but I'm a complete HPT newb and haven't done anything except upload tunes and data log.
Any help is appreciated. Runs great just not super confidence-inspiring to wonder if it will die at any given stop sign.
Thanks in advance.
Idle tuning can be tricky.
I don't claim to be an expert on the topic, but since nobody else has chimed in....
Your "base running airflow" table is shown below.
Try increasing the highlighted cells to 11 grams/second.
And the cell in the lower right corner, I meant to highlight that one too but HPT is quirky that way.
The idea here is to hold the throttle blade just a little further open, in hopes of avoiding that stumble. But I'm a little concerned that the PCM might just learn its way back to the exact same behavior that you're seeing now, since this table is really kind of a starting point for the PCM, and it has a couple of adaptive mechanisms that are supposed to fine-tune the airflow value on-the-fly. But, if this doesn't help, you can always just put those cells back where they were. These tables are pretty safe to tinker with.
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.
Bogs & Sometimes Dies When Coming to a Stop 
