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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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11-19-2017, 08:46 AM | #1 |
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Surging / Stciking Idle
I recently starting having an issue where the idle surges / sticks at around 2-3k rpm when I come to a stop if my clutch is depressed. The engine surges / sticks at 2-3k rpm then after a few seconds it will typically come back down to normal sub 1k rpm. I noticed that if I put the gear into neutral and release the clutch pedal it comes back to down to normal pretty much right away.
I have a ACT 6-puck clutch/prolite flywheel, so could it be that or a vacuum leak or something wrong with my EcuTek tune? Any ideas?
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FBM Base Turbo Kit with GTX2867R and FlexFuel Kit with Walbro 485 / 550cc Injectors
EcuTek Tuned witih Greddy Profec @ 12PSI Shell 91-E73 and 18PSI E73 1993 Mazda MX6 N/A Fully Built on MegaSquirt (work in progress) 2023 Chevrolet Corvette Z51 Stock |
11-19-2017, 02:53 PM | #2 |
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My engine acted like that when I had an exhaust leak.
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11-19-2017, 03:16 PM | #3 | |
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Quote:
humfrz |
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11-20-2017, 09:26 AM | #4 | |
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OP, when is the last time you adjusted the idle mixture and set timing? But seriously, can you get a datalog while it happens? Much easier to troubleshoot with sensor data during the event, have you talked to your tuner ar all yet?
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The Following User Says Thank You to DJCarbine For This Useful Post: | humfrz (11-20-2017) |
11-20-2017, 11:48 AM | #5 | |
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Oh, my, hold up OP ......... I posted on the wrong forum ....... I thought I was on the 50s car forum ....... I'd better get back over there before that old dude goes crazy looking for the OBDII port, to do data logging ....... humfrz |
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11-21-2017, 08:01 AM | #6 |
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Mine was going nuts when the professional apprentice subaru mechanic used way too much throttle body cleaner during two of the routine services.
It fixed itself after a couple of days. |
11-21-2017, 08:57 PM | #7 |
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Log whats going on with ecutek cable if you have it
Check ltft it should be arround 5% or less if its like over 10% you likely have intake od exhaust leak Afr at idle should be pretty close to 14.7 Ignition timing should ve arround 12 degrees after car warms up The car will have faster idle on cold start , should onlt be for first few minutes then should settle to bg base idle of avout 700 Edit I see your turbo , so could be a several other things with tune, ie could be speed density tune issue or flex sensor or bov leak, etc incoreectly scaled injecotrs. Best talk to tuner that did the work |
11-22-2017, 05:03 AM | #8 |
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Ok thanks for the info, hopefully I have time this week to look into it further.
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FBM Base Turbo Kit with GTX2867R and FlexFuel Kit with Walbro 485 / 550cc Injectors
EcuTek Tuned witih Greddy Profec @ 12PSI Shell 91-E73 and 18PSI E73 1993 Mazda MX6 N/A Fully Built on MegaSquirt (work in progress) 2023 Chevrolet Corvette Z51 Stock |
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