Cleaned IAC vavle, now car won't idle
#1
Cleaned IAC vavle, now car won't idle
I have a 95 Civic with a D16Z6 and an automatic. I decided to change the spark plugs and clean the IAC valve today (had a bit of a rough idle I was hoping to clear up) and now the car will barely start, and when it does, it won't idle without dying. However, if I can get it started and hold the accelerator pedal, it will run just fine, no misses or anything.
Here's what I did to clean the IAC:
Took the two bolts off.
Unplugged the connector.
I left the two hoses attached (they wouldn't budge when I tried removing the hoses), and sprayed TB cleaner into the two openings.
Let it dry for about half an hour.
Hooked everything back up.
Is there something I'm missing here? I ruled out it being the plugs since it revs and runs fine if I give it some gas. The IAC itself looks pretty clean, and the gasket still looks pretty good too.
Thanks in advance.
Edit: Here's a picture of it as it sits right now:
Here's what I did to clean the IAC:
Took the two bolts off.
Unplugged the connector.
I left the two hoses attached (they wouldn't budge when I tried removing the hoses), and sprayed TB cleaner into the two openings.
Let it dry for about half an hour.
Hooked everything back up.
Is there something I'm missing here? I ruled out it being the plugs since it revs and runs fine if I give it some gas. The IAC itself looks pretty clean, and the gasket still looks pretty good too.
Thanks in advance.
Edit: Here's a picture of it as it sits right now:
#3
Re: Cleaned IAC vavle, now car won't idle
I sprayed the IAC out again, this time with MAF cleaner, and let it sit a bit longer and then sprayed some compressed air into the IAC to make sure it was dry, and hooked it back up. I also disconnected the battery for a while to reset the ECU. After all that, the first start was pretty rough, but now it seems to be able to idle again without dying. The only thing is, the idle is much lower than what it used to be. The tachometer doesn't even register anything when it's warmed up and idling, so it seems to be idling under 500 rpm then. Is this normal?
#4
Honda-Tech Member
Re: Cleaned IAC vavle, now car won't idle
I would drive it a day or 2. Let it burn through everything. Then check again. If need be, you may need to adjust the idle screw to gain a little more rpm at idle. 750+/-50rpm is normal..
#5
Honda-Tech Member
Re: Cleaned IAC vavle, now car won't idle
Use this link. Another h-t member help me with this link.
picture_4760.jpg Photo by RonJ_HT | Photobucket
Also, try this first.
http://my.prostreetonline.com/2014/1...vice-your-iac/
picture_4760.jpg Photo by RonJ_HT | Photobucket
Also, try this first.
http://my.prostreetonline.com/2014/1...vice-your-iac/
#7
Re: Cleaned IAC vavle, now car won't idle
Use this link. Another h-t member help me with this link.
picture_4760.jpg Photo by RonJ_HT | Photobucket
Also, try this first.
How To Service your IAC - My Pro Street
picture_4760.jpg Photo by RonJ_HT | Photobucket
Also, try this first.
How To Service your IAC - My Pro Street
Yep. I did the plugs one at a time, so no chance that the wires were mixed up.
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#8
Re: Cleaned IAC vavle, now car won't idle
You should check timing with a timing light. Wrong timing of course causes various runnability problems.
The first link is for a 1996 or later with 3 wire IACV so it really doesn't apply to your car.
IIRC, adjustment procedure for 1992-1995 is as follows:
Warm up the engine. Confirm that the CEL is not lit. Turn off lights, heater, A/C etc.
Unplug the IACV and set the air screw for about 450 rpm-- which is running slower than normal idle but not stalling. Do not turn the throttle plate stop screw. The adjustment is the flat-head screw valve in the top of the throttle body. It is a good idea to first completely remove the screw and clean the passage with spray cleaner, because it accumulates the same black gunk that the IACV does.
Reconnect IACV and a normal idle should pick up. Unplugging the wire while running will turn the CEL on with a code 14. Clear the code when you are done adjusting.
The first link is for a 1996 or later with 3 wire IACV so it really doesn't apply to your car.
IIRC, adjustment procedure for 1992-1995 is as follows:
Warm up the engine. Confirm that the CEL is not lit. Turn off lights, heater, A/C etc.
Unplug the IACV and set the air screw for about 450 rpm-- which is running slower than normal idle but not stalling. Do not turn the throttle plate stop screw. The adjustment is the flat-head screw valve in the top of the throttle body. It is a good idea to first completely remove the screw and clean the passage with spray cleaner, because it accumulates the same black gunk that the IACV does.
Reconnect IACV and a normal idle should pick up. Unplugging the wire while running will turn the CEL on with a code 14. Clear the code when you are done adjusting.
#9
Re: Cleaned IAC vavle, now car won't idle
You should check timing with a timing light. Wrong timing of course causes various runnability problems.
The first link is for a 1996 or later with 3 wire IACV so it really doesn't apply to your car.
IIRC, adjustment procedure for 1992-1995 is as follows:
Warm up the engine. Confirm that the CEL is not lit. Turn off lights, heater, A/C etc.
Unplug the IACV and set the air screw for about 450 rpm-- which is running slower than normal idle but not stalling. Do not turn the throttle plate stop screw. The adjustment is the flat-head screw valve in the top of the throttle body. It is a good idea to first completely remove the screw and clean the passage with spray cleaner, because it accumulates the same black gunk that the IACV does.
Reconnect IACV and a normal idle should pick up. Unplugging the wire while running will turn the CEL on with a code 14. Clear the code when you are done adjusting.
The first link is for a 1996 or later with 3 wire IACV so it really doesn't apply to your car.
IIRC, adjustment procedure for 1992-1995 is as follows:
Warm up the engine. Confirm that the CEL is not lit. Turn off lights, heater, A/C etc.
Unplug the IACV and set the air screw for about 450 rpm-- which is running slower than normal idle but not stalling. Do not turn the throttle plate stop screw. The adjustment is the flat-head screw valve in the top of the throttle body. It is a good idea to first completely remove the screw and clean the passage with spray cleaner, because it accumulates the same black gunk that the IACV does.
Reconnect IACV and a normal idle should pick up. Unplugging the wire while running will turn the CEL on with a code 14. Clear the code when you are done adjusting.
Idle
And I'll have to get a timing light so I can check that.
Thanks!
#12
Re: Cleaned IAC vavle, now car won't idle
Would a timing light with a tachometer function be suitable for the external tach, or should I look into something else as far as that goes?
And has anyone else ever ran into having their idle speed change after cleaning the IAC?
And has anyone else ever ran into having their idle speed change after cleaning the IAC?
#14
Honda-Tech Member
Re: Cleaned IAC vavle, now car won't idle
I stand corrected. My apology for posting wrong info. Hopefully you can get it resolve soon.
What spark plugs did you get, and did you gap them accordingly? Unless it's iridium then no gap required.
What spark plugs did you get, and did you gap them accordingly? Unless it's iridium then no gap required.
#15
Re: Cleaned IAC vavle, now car won't idle
Thanks for the help everyone!
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hannslebo
Honda Civic / Del Sol (1992 - 2000)
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04-03-2011 09:46 AM