98 Civic hatch - fluctuating idle when A/C is on
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98 Civic hatch - fluctuating idle when A/C is on
sorry haven't responded in a while. Ive done a bunch of other stuff since my last post but the problem still exist.
Changed both TB and intake mani. gaskets
Bypassed the FITV
And today I found a guy on CL parting out a complete manifold. SoI swapped the TB from that manifold but still no go. I also swapped the EACV and the purge solenoid just to see if it does anything.
I dont know where to go from here. All sensors/valves on the intake mani have been replaced. Ive checked for vac leaks multiple times.
Can something else beside a vac leak or faulty sensor cause this? Something with the ignition maybe? Im running out of ideas!!
Changed both TB and intake mani. gaskets
Bypassed the FITV
And today I found a guy on CL parting out a complete manifold. SoI swapped the TB from that manifold but still no go. I also swapped the EACV and the purge solenoid just to see if it does anything.
I dont know where to go from here. All sensors/valves on the intake mani have been replaced. Ive checked for vac leaks multiple times.
Can something else beside a vac leak or faulty sensor cause this? Something with the ignition maybe? Im running out of ideas!!
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Re: another fluctuating idle thread - 95 civic ex
The thing is that for me it only happens when I have the A/C on. When the A/C is off, it doesn't give me that issue.
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Re: another fluctuating idle thread - 95 civic ex
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Re: another fluctuating idle thread - 95 civic ex
I had forgot to say that I have a '98 Civic Cx Hatchback with these issue.
#5
Re: another fluctuating idle thread - 95 civic ex
I have not done any type of A/C work to it, it's still the orginal from when the car was new. The condenser fan does go on but the only thing is that the compressor is making a funny noise from what I'm thinking it's coming from. Cause when the a/c is on, the car sounds and idles weird, and when the a/c is off, the car sounds normal and idles fine. If it is the compressor, why would it cause this problem???
I had forgot to say that I have a '98 Civic Cx Hatchback with these issue.
I had forgot to say that I have a '98 Civic Cx Hatchback with these issue.
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Re: another fluctuating idle thread - 95 civic ex
Also check whether the condenser is heavily clogged with bugs/road debris or the fins are bent and occluding air passage through the condenser. If that's fine, either take the car to a reputable A/C shop or hook up a manifold gauge set and read the low and high side pressures with the engine idling at 1500 rpm. Post the readings.
Ok, I'll see when I can find someone to do that for me. I'll let you know as soon as I get it checked out, thanks.
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Re: another fluctuating idle thread - 95 civic ex
A/C Pressure Test On 1,500 RPM
http://www.youtube.com/watch?v=S-o4T...ature=youtu.be
A/C Pressure Test On Idle
http://www.youtube.com/watch?v=Y2Mpn...ature=youtu.be
Let me know what you think
http://www.youtube.com/watch?v=S-o4T...ature=youtu.be
A/C Pressure Test On Idle
http://www.youtube.com/watch?v=Y2Mpn...ature=youtu.be
Let me know what you think
Last edited by Former User; 08-12-2011 at 09:42 PM.
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Re: another fluctuating idle thread - 95 civic ex
You've got some issues. a 134a system should NOT be running anywhere near 275 psi on the high side unless it's about 140 degrees where you are. You're probably tripping off on high pressure. This would explain the weird noises from your compressor. It's working wayyy too hard.
Before you go evacuating and recharging your system, make sure your condenser fan is running, your condenser itself is as clean as you can get it and your evaporator is clear of leaves, dirt, bugs, etc. If either one of these is dirty, you'll get crappy readings on your gauges.
Looking at your videos again though, high discharge pressures, low suction usually points to a restriction in your expansion valve.
Before you go evacuating and recharging your system, make sure your condenser fan is running, your condenser itself is as clean as you can get it and your evaporator is clear of leaves, dirt, bugs, etc. If either one of these is dirty, you'll get crappy readings on your gauges.
Looking at your videos again though, high discharge pressures, low suction usually points to a restriction in your expansion valve.
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Re: another fluctuating idle thread - 95 civic ex
You've got some issues. a 134a system should NOT be running anywhere near 275 psi on the high side unless it's about 140 degrees where you are. You're probably tripping off on high pressure. This would explain the weird noises from your compressor. It's working wayyy too hard.
Before you go evacuating and recharging your system, make sure your condenser fan is running, your condenser itself is as clean as you can get it and your evaporator is clear of leaves, dirt, bugs, etc. If either one of these is dirty, you'll get crappy readings on your gauges.
Looking at your videos again though, high discharge pressures, low suction usually points to a restriction in your expansion valve.
Before you go evacuating and recharging your system, make sure your condenser fan is running, your condenser itself is as clean as you can get it and your evaporator is clear of leaves, dirt, bugs, etc. If either one of these is dirty, you'll get crappy readings on your gauges.
Looking at your videos again though, high discharge pressures, low suction usually points to a restriction in your expansion valve.
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Re: another fluctuating idle thread - 95 civic ex
Fin combs are pretty much useless on automotive condensers. They work so-so on your home one. Different fin setups.
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Re: another fluctuating idle thread - 95 civic ex
It's in the mid's 80's in the morning, plus I was in the shades. Yea, the air is blowing cold.
#19
Re: another fluctuating idle thread - 95 civic ex
Describe your idle problem. Does the compressor clutch seem to cycle on and off constantly with the A/C running, causing the idle speed to jump around? Any CEL codes?
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Re: another fluctuating idle thread - 95 civic ex
Ron, where are you seeing that a 350 psi high side is a good thing?
That's insanely high for a residential R22 system, and even more insane for one charged with 134a.
That's insanely high for a residential R22 system, and even more insane for one charged with 134a.
#21
Re: another fluctuating idle thread - 95 civic ex
The pressure switch doesn't open until the high side pressure reaches 455 psi or above.
Last edited by Former User; 08-13-2011 at 06:41 AM.
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Re: another fluctuating idle thread - 95 civic ex
Based on a chart in the service manual, your low side ~18 and high side ~270 are both on the low side. I would have expected pressures more like 40 low/350 high.
Describe your idle problem. Does the compressor clutch seem to cycle on and off constantly with the A/C running, causing the idle speed to jump around? Any CEL codes?
Describe your idle problem. Does the compressor clutch seem to cycle on and off constantly with the A/C running, causing the idle speed to jump around? Any CEL codes?
#24
Re: another fluctuating idle thread - 95 civic ex
It's normal for the compressor clutch to cycle on and off, but not if it does so very rapidly, for example every 5 seconds. When you did your pressure test at idle, I did not notice much cycling so I'll assume that this is not a problem. This together with the fact that your A/C is blowing cold, I don't think that your A/C system is the root cause of your idle problem. So let's refocus on your idle problem. Please again describe it in detail.
Based on the chart, your refrigerant pressures are a bit low, but since your A/C is blowing cold, I would leave it alone for now.
Based on the chart, your refrigerant pressures are a bit low, but since your A/C is blowing cold, I would leave it alone for now.
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Re: another fluctuating idle thread - 95 civic ex
It's normal for the compressor clutch to cycle on and off, but not if it does so very rapidly, for example every 5 seconds. When you did your pressure test at idle, I did not notice much cycling so I'll assume that this is not a problem. This together with the fact that your A/C is blowing cold, I don't think that your A/C system is the root cause of your idle problem. So let's refocus on your idle problem. Please again describe it in detail.
Based on the chart, your refrigerant pressures are a bit low, but since your A/C is blowing cold, I would leave it alone for now.
Based on the chart, your refrigerant pressures are a bit low, but since your A/C is blowing cold, I would leave it alone for now.
Ok, when the a/c is on and only the a/c while I'm driving and coming to a stop or red light. When I let go of the clutch and the RPM is dropping back down to it's position it's suppose to be, it slugs for a quick second and go's back to it's regular idle. I would like to record it but I don't have video on my iPhone since it's the 2nd gen iPhone that I have. I can explain it more over the phone if you'll like.