Idle issue? - Page 11 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

otoz · 06-13-2012, 01:37 PM

Quote:

Originally Posted by DantKR

I've seen a lot of cars that do that if when they drop RPMs. I don't think any car I've owned that was manual ever stopped right at idle and always dipped low and then came back up.

I would agree, It just seems like the dip is a little more pronounced on the FRS. I dont think its a problem, but is this what other people are experiencing or is there a different issue?

Re~Mix · 06-13-2012, 02:07 PM

Quote:

Originally Posted by DantKR

Mine sat here after 30min drive and was idle for about 2 min:

So if I understand things correctly now this is what it should NOT do? My FRS seems to sit at 500-750 RPM a decent amount of the time and otherwise near 1000 RPM.

Should I be worried? Honestly, it hasn't made any bad sounds like the engine is struggling or tended to stall whilst idling in nuetral or with the clutch pedal pressed in.

EDIT: In any case, it doesn't seem to bounce around or "dip" uncontrollably

DantKR · 06-13-2012, 02:12 PM

Quote:

Originally Posted by Re~Mix

So if I understand things correctly now this is what it should NOT do? My FRS seems to sit at 500-750 RPM a decent amount of the time and otherwise near 1000 RPM.

Should I be worried? Honestly, it hasn't made any bad sounds like the engine is struggling or tended to stall whilst idling in nuetral or with the clutch pedal pressed in.

No, this is where it should be. That's pretty much a perfect idle. 1,000 RPMs should only be for the first 2-3 minutes of operation and then it'll go down by about 100-200 and then finally settle at about 600-700. The engine will probably never sound like it's struggling unless it starts to hit 300 or below. Then that is an issue.

otoz · 06-13-2012, 02:15 PM

Quote:

Originally Posted by Re~Mix

So if I understand things correctly now this is what it should NOT do? My FRS seems to sit at 500-750 RPM a decent amount of the time and otherwise near 1000 RPM.

Should I be worried? Honestly, it hasn't made any bad sounds like the engine is struggling or tended to stall whilst idling in nuetral or with the clutch pedal pressed in.

EDIT: In any case, it doesn't seem to bounce around or "dip" uncontrollably

Does yours dip after you give it a little gas and let off the accelerator like in my video?

yayforaddison · 06-13-2012, 02:24 PM

The car isn't idling low all the time. If it sat for 2 mins at the same rpm then it's fine, but ours seems to do it when slowing down. As far as I know, it's not normal to stall when coming to a light, or even drop low enough in idle to nearly stall and shake.

civicdrivr · 06-13-2012, 02:26 PM

Quote:

Originally Posted by DantKR

No, this is where it should be. That's pretty much a perfect idle. 1,000 RPMs should only be for the first 2-3 minutes of operation and then it'll go down by about 100-200 and then finally settle at about 600-700. The engine will probably never sound like it's struggling unless it starts to hit 300 or below. Then that is an issue.

When my engine is cold, it idles at ~1500rpms for a few minutes. Not sure if thats normal or not though. All of my previous cars would idle at 1k while cold then drop down to 750-800rpms.

DantKR · 06-13-2012, 02:26 PM

Quote:

Originally Posted by yayforaddison

The car isn't idling low all the time. If it sat for 2 mins at the same rpm then it's fine, but ours seems to do it when slowing down. As far as I know, it's not normal to stall when coming to a light, or even drop low enough in idle to nearly stall and shake.

That what you describe is not normal and def not what was in the vid. This sounds like a fuel line/pump issue and I would defiantly have it looked at if you can reproduce.

DantKR · 06-13-2012, 02:28 PM

Quote:

Originally Posted by civicdrivr

When my engine is cold, it idles at ~1500rpms for a few minutes. Not sure if thats normal or not though. All of my previous cars would idle at 1k while cold then drop down to 750-800rpms.

1000-1200 is fairly normal. 1500 isn't out of the question.

phm14 · 06-13-2012, 02:29 PM

Quote:

Originally Posted by Rabble

You guys should post the section of your vin that says which number it was off the factory line. It would be interesting to see if there is a pattern of a specific batch of cars having this issue or if it is random.

I was thinking the same thing. Maybe the OP can edit the 1st post, listing username, last 5 of VIN #, production date and delivery area. My frs mt is running fine so far @ 500 + miles.

davisk6 · 06-13-2012, 02:41 PM

What you are describing sounds like a vacuum leak or a MAF problem. MAF turbo cars with BOV's have this same problem if the BOV is set too "soft", ie, the system doesn't close. Either way, I'd have it checked out by a dealer. Chances are some of the intake routing hoses are loose or cracked.

Re~Mix · 06-13-2012, 02:46 PM

Quote:

Originally Posted by otoz

Does yours dip after you give it a little gas and let off the accelerator like in my video?

I haven't noticed it yet, but I will be on the lookout. Approx 750 miles on my MT FRS

rice_classic · 06-13-2012, 03:03 PM

My s2000 did this sometimes after a big change in weather. Example: Seattle has a very temperate climate and doesn't see anything "warm" until July then bam: 85 degree days. The S2000 would have to "re-learn" the ambient air, would stumble a bit at idle, "pop up" then come back down and it's all good. It might do this a couple times after the start of the warm season.

Ok, but this is of now value to those where the CEL's were coming on or the car was dying... That's a bigger problem I suspect and if it happens to me when I buy mine I will be back in the dealership IMMEDIATELY.

motofan · 06-13-2012, 03:08 PM

I once drove a modified S2000 with turbo. If I quickly release the gas when the car in station, the RPM can drop to very low, the higher I rev it, and release quickly, the lower it drops and can stall very easily. However, it I release gently, there is much less chance for RPM to drop lower than it should be at idle.

So, can you guys with MT FR-S try to see if you gently release the gas, coasting rpm back to about 800, is the problem is still there?

motofan · 06-13-2012, 03:12 PM

Quote:

Originally Posted by civicdrivr

When my engine is cold, it idles at ~1500rpms for a few minutes. Not sure if thats normal or not though. All of my previous cars would idle at 1k while cold then drop down to 750-800rpms.

That should be normal. Every car does it so it can warm up quicker. Don't sit and wait the car to warm up, drive it. This warms the engine up quicker. Sitting there does more harm to the engine and is bad to the environment.

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06-13-2012, 02:24 PM	#145
yayforaddison Senior Member Join Date: Jul 2011 Drives: Whiteout FR-S Location: Louisville, KY Posts: 344 Thanks: 95 Thanked 52 Times in 29 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	The car isn't idling low all the time. If it sat for 2 mins at the same rpm then it's fine, but ours seems to do it when slowing down. As far as I know, it's not normal to stall when coming to a light, or even drop low enough in idle to nearly stall and shake.

06-13-2012, 02:41 PM	#150
davisk6 Member Join Date: Mar 2012 Drives: BRZ Location: Massachusetts Posts: 82 Thanks: 13 Thanked 22 Times in 16 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	What you are describing sounds like a vacuum leak or a MAF problem. MAF turbo cars with BOV's have this same problem if the BOV is set too "soft", ie, the system doesn't close. Either way, I'd have it checked out by a dealer. Chances are some of the intake routing hoses are loose or cracked.

06-13-2012, 03:03 PM	#152
rice_classic Senior Member Join Date: Jun 2012 Drives: Nevermorange FRS Location: Seattle, WA Posts: 4,160 Thanks: 755 Thanked 4,200 Times in 1,803 Posts Mentioned: 77 Post(s) Tagged: 1 Thread(s)	My s2000 did this sometimes after a big change in weather. Example: Seattle has a very temperate climate and doesn't see anything "warm" until July then bam: 85 degree days. The S2000 would have to "re-learn" the ambient air, would stumble a bit at idle, "pop up" then come back down and it's all good. It might do this a couple times after the start of the warm season. Ok, but this is of now value to those where the CEL's were coming on or the car was dying... That's a bigger problem I suspect and if it happens to me when I buy mine I will be back in the dealership IMMEDIATELY.

06-13-2012, 03:08 PM	#153
motofan Senior Member Join Date: Jun 2012 Drives: 10 VW GTI Location: Oregon Posts: 156 Thanks: 15 Thanked 25 Times in 20 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I once drove a modified S2000 with turbo. If I quickly release the gas when the car in station, the RPM can drop to very low, the higher I rev it, and release quickly, the lower it drops and can stall very easily. However, it I release gently, there is much less chance for RPM to drop lower than it should be at idle. So, can you guys with MT FR-S try to see if you gently release the gas, coasting rpm back to about 800, is the problem is still there?

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