Took my car in for rough idle...
 

And the dealership said it was either bad gas or the car trying to save gas.


*eye roll*


He said he didn't think there were any TSBs out for my car and to not worry about it.


Jalopnik and three prior year TSBs disagree with him.

this is where you need to print out the TSB and shove in their asses..i mean faces so they can't say otherwise

check the TSB / Recall thread: http://www.ft86club.com/forums/showt...=21868&page=22

Thanks, but I've already looked here a few times. Nothing for 16s yet. There's one for autos hard shifting, but not manuals.

My 2016 runs rough every once in a while...maybe 1-2 a month...will be addressing it on the next oil change.

Gah yeah i had this too last month. Ever since i went stage 2 though i havnt noticed it. I was freaking out becacuse the car was only 3 months old that point.

Have you done any power mods to the car .. ??

Have you changed sources of gas lately .. ??


humfrz

In the decade I've been driving and filling up my own cars, easily over 75k miles driven, that'd be over 2,000 gallons purchased, I've never had 'bad gas'.

Have you had any 'bad gas' in the last decade or two?

Well now, you live in the SF Bay area and I live in the Seattle area ........ but the OP is from Arkansas.......;)

Back in my Miata (required premium) driving days (all over the MW and West), I've run across stations, out in the bush, that claimed to have hi-test gas. However, after seeing the spider webs and dust on the hi-test pump, I would pass and get just enough regular to get me back to civilization.

Now, I'm not sayen that Bubba was pumping the hi-test out of a 55 gal barrel, 1/3 full of water, ....... I wasn't about to chance it.

But, generally, these days, I would blame rough idle on an electrical (including ECU) problem rather than "bad gas".


humfrz

Yeah I agree it could have been bad gas. You don't know what you're getting when you're in Nowhere-Ville, how long their premium gas stock has been sitting. I'm not an expert on gas, but I generally avoid gas stations that wouldn't have a lot of customers buying premium.

But who knows what the newer ECU programming is. If it persists, I'd consider getting the car tuned and start monitoring stuff.

To add, are you guys sure that it's not normal operation? Do you get a stumble or is it truly rough all the time? The stumbling idle is pretty much normal if you operate window switches and other electrics at idle.

It's done it since I got it six months or so ago. So I doubt it was bad gas.

There are times when mine moves around a bit and it seems to just be normal engine operation as the AC and other stuff turns on or off.


But what I'm seeing sometimes is a drop below 500rpms. About 3-4 times now, it's dropped low enough to make the engine miss a beat and come back. The rest of the time, it's still bad enough that you can feel the engine shaking through the car.


I've had my car in twice now to tell my dealer about it. The first time, they said the car was just trying to save gas and run lean. The second time they hooked it to their scanner and couldn't find anything. And they didn't see any TSBs for the car, either.


I have no power mods done to the car. Actually, this has been holding me back from doing anything to the car. As I don't completely trust it right now, I'd hate to throw some headers and a tune on it only to get a CEL later and have the dealer tell me I've voided my warranty.

Seals, it is possible that the injector seals are bad on it. Usually this is a problem that mostly happens to people who track the car, but I guess enough ambient heat can do the trick as well. Does the car dip to around/below 500 rpm and then right before stalling goes up to like 1k rpm on its own and does this little cycle several times in a row? If so, it might be the injector seals, if it does it only once it might just be the AC that turned on. Remember that when you have the air directed towards the windshield (or feet and windshield) the AC is on all the time, wether you want hot or cold air (its a setting on the car that can be changed by techstream and the default value is on).

I have had bad e85 once. God did it suck.