loping idle after warm-up
#1
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loping idle after warm-up
1993 Accord LX 190k
Loping idle after warm up - Idle Air Control Valve? If so, is it serviceable?
If not serviceable, is aftermarket sufficient?
Loping idle after warm up - Idle Air Control Valve? If so, is it serviceable?
If not serviceable, is aftermarket sufficient?
#2
Honda-Tech Member
Re: loping idle after warm-up
A warm lope is usually a vacuum related leak. When the FITV acts up it over idles cold, and will bounce.
I would start with trying to find a vacuum leak myself. The IACV can act up, but when it does, its because it cannot remove any more air from the engine (IE vacuum leak).
Start with finding a vacuum leak, and then check engine base idle with the engine warm, and IACV unplugged. Adjust your throttle bleed screw as needed to reach 450rpm warm. DO THIS ONLY AFTER you find any vacuum leaks.
I would start with trying to find a vacuum leak myself. The IACV can act up, but when it does, its because it cannot remove any more air from the engine (IE vacuum leak).
Start with finding a vacuum leak, and then check engine base idle with the engine warm, and IACV unplugged. Adjust your throttle bleed screw as needed to reach 450rpm warm. DO THIS ONLY AFTER you find any vacuum leaks.
#3
Re: loping idle after warm-up
one reason is fast idle thermo valve screw it to clockwise, if not other is air boost valve, disable air input of this item and see if te loop still accure. isolved my problem by repairing this air boost valve. this valve is marked as green at below link
Honda IACV explained - Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com
sorry for my english..
Honda IACV explained - Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com
sorry for my english..
#4
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Re: loping idle after warm-up
I say it's the IACV. FITV shows issues at cold start....not running temp. Yes it could be a vacuum leak but if nothing has been messed with recently, I say IACV is stuck and gunked up. I've had issues with my old Bswap and with my current Kswap (from HMO).
Take IACV off and see how it looks inside. Carburetor cleaner will help clean it. Not sure what your IACV looks like but I have taken the black plastic electrical portion off IACV and soaked the metal portion in carb cleaner over night.
Or get lazy and buy one from a recycle or new OEM from an online dealership. I would check it first and see if it looks dirty inside. If it looks fine, check for vacuum leaks.
Take IACV off and see how it looks inside. Carburetor cleaner will help clean it. Not sure what your IACV looks like but I have taken the black plastic electrical portion off IACV and soaked the metal portion in carb cleaner over night.
Or get lazy and buy one from a recycle or new OEM from an online dealership. I would check it first and see if it looks dirty inside. If it looks fine, check for vacuum leaks.
#5
Re: loping idle after warm-up
please check this topic..
https://honda-tech.com/honda-accord-...valve-2493942/
https://honda-tech.com/honda-accord-...valve-2493942/
#7
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Re: loping idle after warm-up
Update:
I removed & cleaned out the IACV after I saw how much those things cost (egads!!) - I sprayed it down with some carb cleaner and actually let it fill up with carb cleaner and sit for a few minutes.
After re-assembly, the loping idle is for the most part, gone. After driving the car for about 20 minutes, I noticed the loping has returned but only intermittently now whereas before it was like clockwork - very rhythmic.
I screwed down the plastic adjuster on the fast idle air control valve also.
If I end up having to purchase a replacement part for either valve, is there a certain aftermarket brand to choose, or to stay away from? Is this another one of those "go with OEM" scenerios?
I removed & cleaned out the IACV after I saw how much those things cost (egads!!) - I sprayed it down with some carb cleaner and actually let it fill up with carb cleaner and sit for a few minutes.
After re-assembly, the loping idle is for the most part, gone. After driving the car for about 20 minutes, I noticed the loping has returned but only intermittently now whereas before it was like clockwork - very rhythmic.
I screwed down the plastic adjuster on the fast idle air control valve also.
If I end up having to purchase a replacement part for either valve, is there a certain aftermarket brand to choose, or to stay away from? Is this another one of those "go with OEM" scenerios?
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#8
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Re: loping idle after warm-up
How did you get the electrical portion off? Mine looks like it's got a pentagonal allen-type wrench fastener (as opposed to a hexagonal on a typical allen wrench).
#9
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Re: loping idle after warm-up
Ones I've done had a 5-pointed star shape. I used my dremel and a cutting disc. I made a linear groove across the screw head so I could loosen it off with my screedriver. Pretty easy just take your time and be steady.
#11
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Re: loping idle after warm-up
Sort of. It's really more like an Allen fastener except it has 5 sides instead of 6.
Amazon has a tool set for $13 that has the pentagon bit...
Amazon has a tool set for $13 that has the pentagon bit...
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#13
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Re: loping idle after warm-up
I say it's the IACV. FITV shows issues at cold start....not running temp. Yes it could be a vacuum leak but if nothing has been messed with recently, I say IACV is stuck and gunked up. I've had issues with my old Bswap and with my current Kswap (from HMO).
Take IACV off and see how it looks inside. Carburetor cleaner will help clean it. Not sure what your IACV looks like but I have taken the black plastic electrical portion off IACV and soaked the metal portion in carb cleaner over night.
Or get lazy and buy one from a recycle or new OEM from an online dealership. I would check it first and see if it looks dirty inside. If it looks fine, check for vacuum leaks.
Take IACV off and see how it looks inside. Carburetor cleaner will help clean it. Not sure what your IACV looks like but I have taken the black plastic electrical portion off IACV and soaked the metal portion in carb cleaner over night.
Or get lazy and buy one from a recycle or new OEM from an online dealership. I would check it first and see if it looks dirty inside. If it looks fine, check for vacuum leaks.
How did you get the plastic actuator off?? (I call it an actuator because it seems like this is the electric portion that moves the spring when it receives a charge....
#15
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Re: loping idle after warm-up
Did the one you worked on look like this?
I hope this link works:
http://m.oreillyauto.com/mt/www.oreillyauto.com/site/c/detail/BWD0/31061/02169.oap?year=1993&make=Honda&model=Accord&vi=116 7241&ck=Search_iacv_1167241_1176&keyword=iacv
I hope this link works:
http://m.oreillyauto.com/mt/www.oreillyauto.com/site/c/detail/BWD0/31061/02169.oap?year=1993&make=Honda&model=Accord&vi=116 7241&ck=Search_iacv_1167241_1176&keyword=iacv
#16
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Re: loping idle after warm-up
The link didn't work.
Let's try to make it simpler. Keep the electrical portion on and just spray carb clean inside the holes and use a cheap metal brush (or old toothbrush) and clean it out as best you can. Rinse it with more carb cleaner when finished. Use a rag and spray carb cleaner on it to clean the holes on the intake manifold.
Make sure it's completely dry before re-installing. Air compressor can make this faster.
Hopefully it's your fix.
Edit: Don't forget to burp the coolant system. Rad cap off and let car idle for awhile. Could be 30-45 minutes. Kick back and watch fluid in radiator through inlet (use a flashlight if needed). Be ready to fill it as the thermo opens and rad losses coolant.
Here's a video I found. Not too informative but hunting idle accord like yours (this one is a 1990). Look at the dirty IACV.
https://www.google.com/url?sa=t&sour...3wb9cKRzE6AxDg
Let's try to make it simpler. Keep the electrical portion on and just spray carb clean inside the holes and use a cheap metal brush (or old toothbrush) and clean it out as best you can. Rinse it with more carb cleaner when finished. Use a rag and spray carb cleaner on it to clean the holes on the intake manifold.
Make sure it's completely dry before re-installing. Air compressor can make this faster.
Hopefully it's your fix.
Edit: Don't forget to burp the coolant system. Rad cap off and let car idle for awhile. Could be 30-45 minutes. Kick back and watch fluid in radiator through inlet (use a flashlight if needed). Be ready to fill it as the thermo opens and rad losses coolant.
Here's a video I found. Not too informative but hunting idle accord like yours (this one is a 1990). Look at the dirty IACV.
https://www.google.com/url?sa=t&sour...3wb9cKRzE6AxDg
#17
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Re: loping idle after warm-up
I've cleaned it out twice now and it's still got the "hunting" symptom. I definitely need to bleed the coolant but it seems like the iacv might need additional cleaning somehow.
This is a 1993 lx accord.
2.2 f22a1 auto trans.
When I apply 12vdc to the terminals of the iacv, the actuator does retract the spring inside but I'm not sure if it's retracting the proper distance, as I'm not sure what the proper distance should be...
I've also replaced the 2 temp sensors and switch right underneath the distributor...
This is a 1993 lx accord.
2.2 f22a1 auto trans.
When I apply 12vdc to the terminals of the iacv, the actuator does retract the spring inside but I'm not sure if it's retracting the proper distance, as I'm not sure what the proper distance should be...
I've also replaced the 2 temp sensors and switch right underneath the distributor...
#19
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Re: loping idle after warm-up
It has a Fast Idle Thermo Valve?
With intake pipe off, (inside TB) there are two holes? One high one low. If so, when idle is hunting, you could plug each (individually) and see how idle reacts.
Edit: burp the coolant soon. Might be the fix.
With intake pipe off, (inside TB) there are two holes? One high one low. If so, when idle is hunting, you could plug each (individually) and see how idle reacts.
Edit: burp the coolant soon. Might be the fix.
#20
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Re: loping idle after warm-up
#21
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Re: loping idle after warm-up
Also, I think you might be right about the coolant - I'd like to pick up one of these to make it a bit easier:
#22
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Re: loping idle after warm-up
I've been reading about using ONLY Honda OEM PCV valves - I have a (new) aftermarket unit on there - surely, this isn't the cause...is it?
#23
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Re: loping idle after warm-up
Lower hole....man I can't say for certain but D and B series motors have the upper hole for IACV and lower hole for FITV. Try to trace it down and see with sensor is for the bottom hole.
#24
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Re: loping idle after warm-up
I watched the video.I see code 14 with the flashing. That's code for IACV (that you unplugged). Reset the ECU and see if code 14 comes back.
Based on my knowledge....IACV unplugged at running temp should idle around 450-500rpm. At least with other Honda motors....that's the way you set idle...by getting that window rpm with idle adjustment (w/IACV unplugged). Then shut car off, plug back in IACV and reset ECU.
Based on my knowledge....IACV unplugged at running temp should idle around 450-500rpm. At least with other Honda motors....that's the way you set idle...by getting that window rpm with idle adjustment (w/IACV unplugged). Then shut car off, plug back in IACV and reset ECU.
#25
Re: loping idle after warm-up
It really looks like your iacv is bad. If it had a vacuum leak only it should still be idling higher with the iacv closed because it would still be pulling in air.
These things are really completely unserviceable outside of cleaning the outer metal mesh of any debris. Once you still spraying stuff inside, especially carb cleaner based products it will swell the inner seals and kill it.
Grab and oring and spray it with some carb cleaner and watch what happens, especially when the oring is hot.
These things are really completely unserviceable outside of cleaning the outer metal mesh of any debris. Once you still spraying stuff inside, especially carb cleaner based products it will swell the inner seals and kill it.
Grab and oring and spray it with some carb cleaner and watch what happens, especially when the oring is hot.