2008 Honda Fit Sport IAC location?!
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Member
Joined: Mar 2010
Posts: 191
From: Southwest Ohio
2008 Honda Fit Sport IAC location?!
I searched the forums and found no pics so I thought I would ask for some help.
My 2008 Honda Fit Sport is having an issue where if I am stopped, at idle and with AC on the idle will drop to the point where it feels like it will simply stall but kicks back up every time.
It's usually when the compressor kicks on and happens every 15-20secs depending on how hot the ambient temp is. With AC off, the idle never does this...
I searched and it seems that initial shade tree wrenching states cleaning the TB and IAC should help. I got the plumbing all pulled off and thoroughly cleaned the TB and the stall is still there so now I go to clan the IAC and I can't find what the images are showing for my car? It makes no sense, seems like it would have to be attached the the TB but I can't fin this part.
Anybody got a pic of where there's is located to help me out? If and when I find, pull and clean this part and it still does this I will pull the alternator and have it tested.
Thanks in advance.
Dean
My 2008 Honda Fit Sport is having an issue where if I am stopped, at idle and with AC on the idle will drop to the point where it feels like it will simply stall but kicks back up every time.
It's usually when the compressor kicks on and happens every 15-20secs depending on how hot the ambient temp is. With AC off, the idle never does this...
I searched and it seems that initial shade tree wrenching states cleaning the TB and IAC should help. I got the plumbing all pulled off and thoroughly cleaned the TB and the stall is still there so now I go to clan the IAC and I can't find what the images are showing for my car? It makes no sense, seems like it would have to be attached the the TB but I can't fin this part.
Anybody got a pic of where there's is located to help me out? If and when I find, pull and clean this part and it still does this I will pull the alternator and have it tested.
Thanks in advance.
Dean
Member
Joined: Aug 2008
Posts: 1,600
From: Orange, CA, USA
Fit has no IAC valve (it's "drive by wire")
such problems can be caused by bad spark plugs/coils, (if it jerks/labors then recovers) leaking EGR if idle slowly sinking down, then recovers, out of adjustment valves.
Rent or borrow the OBD2 scanner that can show live date and look for MAP reading (idle in park, idle in gear, a/c on in park, a/c on in gear) and post your reading in here
such problems can be caused by bad spark plugs/coils, (if it jerks/labors then recovers) leaking EGR if idle slowly sinking down, then recovers, out of adjustment valves.
Rent or borrow the OBD2 scanner that can show live date and look for MAP reading (idle in park, idle in gear, a/c on in park, a/c on in gear) and post your reading in here
Thread Starter
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Member
Joined: Mar 2010
Posts: 191
From: Southwest Ohio
Well, that would explain the why I don’t see an IAC... thank you for that.
MAP Readings:
Idle(parked) = 7.7-8.0
Idle(Automatic(Drive)) = 10.0-10.6
Idle(parked+AC) = 11.2-11.5
Idle(Drive+AC) = 14.4-14.8
Car never did the stall thing during the 5mins I was out there. Had just gotten back from an errand so car was at full operating temps.
MAP Readings:
Idle(parked) = 7.7-8.0
Idle(Automatic(Drive)) = 10.0-10.6
Idle(parked+AC) = 11.2-11.5
Idle(Drive+AC) = 14.4-14.8
Car never did the stall thing during the 5mins I was out there. Had just gotten back from an errand so car was at full operating temps.
Member
Joined: Aug 2008
Posts: 1,600
From: Orange, CA, USA
Your readings are normal (reading in kPa):
Ac off
Park 27-26
D 33-34
A/C on park 38
A/C on in drive 48
Compared to mine
A/C OFF
MAP readings with ECT at 91 C (a/c off)
Idle in park 26kPa
Idle in drive 33kPa
(STFT 1.6 LTFT 0.8)
A/C on:
MAP reading (with ECT at 82 degrees C):
Idle: 38 kPa
D+brake 49 to 50 kPa (blower at 2nd speed)
STFT -.8 LTFT-1.6
Try idle re-learn procedure and see if it helps.
Ac off
Park 27-26
D 33-34
A/C on park 38
A/C on in drive 48
Compared to mine
A/C OFF
MAP readings with ECT at 91 C (a/c off)
Idle in park 26kPa
Idle in drive 33kPa
(STFT 1.6 LTFT 0.8)
A/C on:
MAP reading (with ECT at 82 degrees C):
Idle: 38 kPa
D+brake 49 to 50 kPa (blower at 2nd speed)
STFT -.8 LTFT-1.6
Try idle re-learn procedure and see if it helps.
Thread Starter
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Member
Joined: Mar 2010
Posts: 191
From: Southwest Ohio
I have done the idle relearn procedure. Twice now actually. It definitely helped make it feel like it had more pep but it has done this again. So I programmed my scanner to display the voltage(at ECM), MAP and idle speeds during my last drive. The MAP seemed to stay consistent during my drives, the RPMs at idle are ~850 but what I did notice that makes me wonder was that the voltage was dropping to 12.20-12.25v with the a/c, lights, radio(factory), fan on full and my foot on the brakes at the stop light. At idle with nothing running it sits around 13.4-13.7. No clue if this is normal but again, the car hasn’t done the surge since the other day which is kind of annoying. Got any doc or input on what the voltage should read during the car at idle, idle with everything running, car at full speed, etc?
Thanks for the help.
Dean
Thanks for the help.
Dean
Last edited by Dean; Jul 31, 2018 at 01:32 PM.
Member
Joined: Sep 2015
Posts: 1,128
From: Digging in your fridge
Got any doc or input on what the voltage should read during the car at idle, idle with everything running, car at full speed, etc?
Thread Starter
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Member
Joined: Mar 2010
Posts: 191
From: Southwest Ohio
So as an update... I am still experiencing this and only because the Defrost turns the A/C on automatically.
Does anybody have a clue what may be causing this Idle drop during stops at lights? It never throws a code, voltage seems normal.
Car is completely stock. ~135k miles on the odometer, all maintenance up to date and no other issues.
It's not every time I stop either? It's just one of those things where I fear the car will eventually die sitting at a stop light and I would rather not have to push it to the side.
The only good thing would be I would finally have something to sort out.
Does anybody have a clue what may be causing this Idle drop during stops at lights? It never throws a code, voltage seems normal.
Car is completely stock. ~135k miles on the odometer, all maintenance up to date and no other issues.
It's not every time I stop either? It's just one of those things where I fear the car will eventually die sitting at a stop light and I would rather not have to push it to the side.
The only good thing would be I would finally have something to sort out.
Member
Joined: Sep 2015
Posts: 1,128
From: Digging in your fridge
Exactly how low does it drop-- according to your scanner data?
Member
Joined: Aug 2008
Posts: 1,600
From: Orange, CA, USA
Interesting thing.
Few times over past 3 years, I've noticed that car idles at speeds lower than typical (at 550 to 600 rpms). It typically happens in stop and go traffic with engine warm and random. If I momentary cycle the headligts (on and off) the idle gets where it suppose to be (700 rpms in D); the idle is stable around 800 rpms with lights on. During the "abnormal behavior" the scanner indicates higher STFT + 6 to + 8% than typical (as opposed to +1.6...2.3%%) Otherwise it looks to me like a "gear backlash" in throttle body drive, but I am sure I wrong on this one. Or can it be biased A/F sensor (reads lean when mixture is actually normal) so an extra fuel causes RPMs to drop ?? . (On 97 Camry (A/F sensor and MAP type EFI) there were no noticeable idle change, however the car failed smog for CO and set P0171 code.
Few times over past 3 years, I've noticed that car idles at speeds lower than typical (at 550 to 600 rpms). It typically happens in stop and go traffic with engine warm and random. If I momentary cycle the headligts (on and off) the idle gets where it suppose to be (700 rpms in D); the idle is stable around 800 rpms with lights on. During the "abnormal behavior" the scanner indicates higher STFT + 6 to + 8% than typical (as opposed to +1.6...2.3%%) Otherwise it looks to me like a "gear backlash" in throttle body drive, but I am sure I wrong on this one. Or can it be biased A/F sensor (reads lean when mixture is actually normal) so an extra fuel causes RPMs to drop ?? . (On 97 Camry (A/F sensor and MAP type EFI) there were no noticeable idle change, however the car failed smog for CO and set P0171 code.
Member
Joined: Aug 2008
Posts: 1,600
From: Orange, CA, USA
Interesting thing.
Few times over past 3 years, I've noticed that car idles at speeds lower than typical (at 550 to 600 rpms). It typically happens in stop and go traffic with engine warm and random. If I momentary cycle the headligts (on and off) the idle gets where it suppose to be (700 rpms in D); the idle is stable around 800 rpms with lights on. During the "abnormal behavior" the scanner indicates higher STFT + 6 to + 8% than typical (as opposed to +1.6...2.3%%) Otherwise it looks to me like a "gear backlash" in throttle body drive, but I am sure I wrong on this one. Or can it be biased A/F sensor (reads lean when mixture is actually normal) so an extra fuel causes RPMs to drop ?? . (On 97 Camry (A/F sensor and MAP type EFI) there were no noticeable idle change, however the car failed smog for CO and set P0171 code.
Few times over past 3 years, I've noticed that car idles at speeds lower than typical (at 550 to 600 rpms). It typically happens in stop and go traffic with engine warm and random. If I momentary cycle the headligts (on and off) the idle gets where it suppose to be (700 rpms in D); the idle is stable around 800 rpms with lights on. During the "abnormal behavior" the scanner indicates higher STFT + 6 to + 8% than typical (as opposed to +1.6...2.3%%) Otherwise it looks to me like a "gear backlash" in throttle body drive, but I am sure I wrong on this one. Or can it be biased A/F sensor (reads lean when mixture is actually normal) so an extra fuel causes RPMs to drop ?? . (On 97 Camry (A/F sensor and MAP type EFI) there were no noticeable idle change, however the car failed smog for CO and set P0171 code.
Member
Joined: Aug 2008
Posts: 1,600
From: Orange, CA, USA
So as an update... I am still experiencing this and only because the Defrost turns the A/C on automatically.
Does anybody have a clue what may be causing this Idle drop during stops at lights? It never throws a code, voltage seems normal.
Car is completely stock. ~135k miles on the odometer, all maintenance up to date and no other issues.
It's not every time I stop either? It's just one of those things where I fear the car will eventually die sitting at a stop light and I would rather not have to push it to the side.
The only good thing would be I would finally have something to sort out.
Does anybody have a clue what may be causing this Idle drop during stops at lights? It never throws a code, voltage seems normal.
Car is completely stock. ~135k miles on the odometer, all maintenance up to date and no other issues.
It's not every time I stop either? It's just one of those things where I fear the car will eventually die sitting at a stop light and I would rather not have to push it to the side.
The only good thing would be I would finally have something to sort out.
New Member
Joined: Dec 2013
Posts: 17
From: Cincinnati
So as an update... I am still experiencing this and only because the Defrost turns the A/C on automatically.
Does anybody have a clue what may be causing this Idle drop during stops at lights? It never throws a code, voltage seems normal.
Car is completely stock. ~135k miles on the odometer, all maintenance up to date and no other issues.
It's not every time I stop either? It's just one of those things where I fear the car will eventually die sitting at a stop light and I would rather not have to push it to the side.
The only good thing would be I would finally have something to sort out.
Does anybody have a clue what may be causing this Idle drop during stops at lights? It never throws a code, voltage seems normal.
Car is completely stock. ~135k miles on the odometer, all maintenance up to date and no other issues.
It's not every time I stop either? It's just one of those things where I fear the car will eventually die sitting at a stop light and I would rather not have to push it to the side.
The only good thing would be I would finally have something to sort out.
Defrost automatically turns the AC on if AC is otherwise turned off? I haven't noticed this, I don't think that happens with my 08. just curious. Best of Luck on the issue.
Member
Joined: Aug 2008
Posts: 1,600
From: Orange, CA, USA
the first step is to find out
a) if idle speed control is reacting fast enough to the engine operation condition changes (throttle angle correction)
b) what causes such changes
The European Jazz users reporting broken wire in the bundle for throttle control circuit (but it sets a code)
a) if idle speed control is reacting fast enough to the engine operation condition changes (throttle angle correction)
b) what causes such changes
The European Jazz users reporting broken wire in the bundle for throttle control circuit (but it sets a code)
New Member
Joined: Mar 2025
Posts: 1
Fit 08 rpm f
Interesting thing.
Few times over past 3 years, I've noticed that car idles at speeds lower than typical (at 550 to 600 rpms). It typically happens in stop and go traffic with engine warm and random. If I momentary cycle the headligts (on and off) the idle gets where it suppose to be (700 rpms in D); the idle is stable around 800 rpms with lights on. During the "abnormal behavior" the scanner indicates higher STFT + 6 to + 8% than typical (as opposed to +1.6...2.3%%) Otherwise it looks to me like a "gear backlash" in throttle body drive, but I am sure I wrong on this one. Or can it be biased A/F sensor (reads lean when mixture is actually normal) so an extra fuel causes RPMs to drop ?? . (On 97 Camry (A/F sensor and MAP type EFI) there were no noticeable idle change, however the car failed smog for CO and set P0171 code.
Few times over past 3 years, I've noticed that car idles at speeds lower than typical (at 550 to 600 rpms). It typically happens in stop and go traffic with engine warm and random. If I momentary cycle the headligts (on and off) the idle gets where it suppose to be (700 rpms in D); the idle is stable around 800 rpms with lights on. During the "abnormal behavior" the scanner indicates higher STFT + 6 to + 8% than typical (as opposed to +1.6...2.3%%) Otherwise it looks to me like a "gear backlash" in throttle body drive, but I am sure I wrong on this one. Or can it be biased A/F sensor (reads lean when mixture is actually normal) so an extra fuel causes RPMs to drop ?? . (On 97 Camry (A/F sensor and MAP type EFI) there were no noticeable idle change, however the car failed smog for CO and set P0171 code.
Fit o8, Tom flactuating after a road drive of even 20 mis of abt 60 km hr.
If I stop on trafic light it stalls on acceleration., or stalling by breaking
Sound of chains or wires when rpm is at around 500 or low after a road drive, sometimes any time it just can't hev a constant rpm at low spds of below 1200rpm. Ts in highly populated areas..
How does its cache Purge soloniod Valve sand af sensor works.
It chooses its rpm even for iddle each time ok run it, and may change anytime.
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