Hi All,
looking for some advice. I picked up my SS with 4 miles on it last week and put approx 300mi on it since. About 90% of the time when I come to a stop it idles down to about 250 RPM then back up to around 750 RPM where normally idles. It seemed like every demo I drove did the same thing. Is this normal? 
Sounds like it needs an updated re-flash! This was a very common problem with early models but I haven’t heard of it on newer ones.
any recent modifications where the ECU is still learning .... CAI?
pwrhaps a good time for a trip to the dealer
I am local to you, and offered some advice, ive been around a few of these and can probably give you some good leads.
Did not get a chance to see, let alone ride in Slingshot before my ownership... like a lot of us here.
Couple of things...
Some dealers use fuel stabilizer and some don't... most don't keep full tank inventories. Demo rides, fuel questionable? Pretty sure with 300 miles on your ride, you have refueled... minimum 91 octane is suggested... although some of us swap between regular and premium.
And since I haven't experienced your riding style, can't comment...
When stopping, if rpm drops below idle before disengaging clutch, the engine may stumble/stall.
If you rule out these possibilities... then as others have stated...
A trip to the dealer as a safety issue will be required.
I am local to you, and offered some advice, ive been around a few of these and can probably give you some good leads.
Hi WingShot, didn't see anything on this issue. I've fueled her up twice thinking it could be the gas. Sometimes it's fine but most of the time seems to drop down for just a few seconds then it idles normally. It happens with the clutch disengaged. I have been downshifting but that shouldn't matter (I just read today that I need to stop downshifting during the break in period). Other than that it is flawless.
Swing on over I’m off north del Prado.
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Please explain what you are doing when you are coasting to the stop. ie: downshifting to each gear, coating down staying in the same gear until you're almost stopped etc. It may just be a matter of a slight change in style of your driving habits that will eliminate what you're experiencing
Swing on over I’m off north del Prado.
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I could possibly later this evening or tomorrow. I own a commercial Audio/Video/Lighting company so my free time during the week is limited. My wife has a meeting this evening so maybe then.
Please explain what you are doing when you are coasting to the stop. ie: downshifting to each gear, coating down staying in the same gear until you're almost stopped etc. It may just be a matter of a slight change in style of your driving habits that will eliminate what you're experiencing
depending on my speed I downshift usually till 2nd gear and let the brakes do the rest
Try leaving it in 3rd 4th or 5th (maybe not fifth) and coast down to like 20-25 then disengage the clutch until you stop. I'd bet that you would not have that stalling feeling. When you downshift the and "back-drag" the engine, the ecu does some odd 'thinking" and tries to make sure it doesn't stall. But IMHO, it does a bad job of that and should have left that out of their ecu tune. Depending on how I ride mine after 30,000 miles, I can get it to act that way, or have a bad rev hang where it wants to flare up to over 2,000 rpm for a couple of seconds between gear shifts. That sure makes it look like the driver can't drive which we all know isn't true. Plus having such low miles, it may even correct itself as you ride it more to break it in
Try leaving it in 3rd 4th or 5th (maybe not fifth) and coast down to like 20-25 then disengage the clutch until you stop. I'd bet that you would not have that stalling feeling. When you downshift the and "back-drag" the engine, the ecu does some odd 'thinking" and tries to make sure it doesn't stall. But IMHO, it does a bad job of that and should have left that out of their ecu tune. Depending on how I ride mine after 30,000 miles, I can get it to act that way, or have a bad rev hang where it wants to flare up to over 2,000 rpm for a couple of seconds between gear shifts. That sure makes it look like the driver can't drive which we all know isn't true. Plus having such low miles, it may even correct itself as you ride it more to break it in
@funinthesun sounds good I'll give that a try
If it is running good during other conditions and doesn't die when you come to a stop, it is just fine.
Put some dry gas in it also....and a tank of 93 octane...and Lucas fuel treatment....then run the crap out of it...
Make sure there are no vacuum lines off...
My 2016.5 yr model would come to a stop and idle low ~550 and raise back up to 750RPM. I'd get a shudder and hated it.
I had my ECU tuned from MeFi burn and the idle is now set at 1Krpm. When it dips now, it hits about 800 and there is no longer a shudder or fear of stalling. For the record, my SS has never stalled from this issue prior to tune.
Aside from the reset idle rpm, the power band has be reshaped and it is a night and day difference. Yet again another mod I kick myself for not doing sooner.
Here’s a pic
