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Hey everybody,

You’re probably getting sick of this (this is the 3rd time I’ve posted about this), but I’m still having a problem with my idle and I’m hoping someone who sees this can help.

I bought a 2003 Eclipse GS with a bad clutch last year and replaced it within a month. It already idled a little high before, but it got pretty bad afterwards and would idle at about 1700 cold. I drove it for a few weeks, and then looked into the idle. Here’s a list of things I’ve replaced (in chronological order):


1. Idle air control valve*
2. Mass air flow sensor
3. Throttle body gasket
4. Throttle position sensor
5. Upstream o2 sensor

*When I replaced the IAC, it got really really bad. The car now idles at 3000 cold and 2000 warm, and surges whenever the wheels are spinning and it’s not in gear (clutch in/neutral and rolling). Video. Nothing else I’ve replaced has affected the idle at all.

I’ve had the car smoke tested at my local mechanic and they found no leaks. I’ve also sprayed brake cleaner around my vacuum lines and intake manifold and found nothing.

Here are some other symptoms besides the idle:

Cruise control light comes on, but it does not work.

Me and a friend were in there trying to figure something out today, and found that it idles at 1000 when the MAF is unplugged, albeit a very, very rough idle.

When the cruise control electrical connector is unplugged, the car surges at idle just like it does when rolling.

I am totally out of ideas for what it could be. Am I supposed to set up my parts like the IAC when I install them? Or is it something blatantly obvious? If anyone here is familiar with these cars or has anything to offer I would really appreciate it. Thank you!

Engine bay
 

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Hello,
I am a certified Kia technician. First off, you replaced too much at once to be able to correctly diagnose your vehicle. If able, start from scratch. No aftermarket parts. Use OE parts if possible. Check fuses, relays, ground connections, etc. Start small, then work your way out.
Hope this helps!
 

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Hey everybody,

You’re probably getting sick of this (this is the 3rd time I’ve posted about this), but I’m still having a problem with my idle and I’m hoping someone who sees this can help.

I bought a 2003 Eclipse GS with a bad clutch last year and replaced it within a month. It already idled a little high before, but it got pretty bad afterwards and would idle at about 1700 cold. I drove it for a few weeks, and then looked into the idle. Here’s a list of things I’ve replaced (in chronological order):


1. Idle air control valve*
2. Mass air flow sensor
3. Throttle body gasket
4. Throttle position sensor
5. Upstream o2 sensor

*When I replaced the IAC, it got really really bad. The car now idles at 3000 cold and 2000 warm, and surges whenever the wheels are spinning and it’s not in gear (clutch in/neutral and rolling). Video. Nothing else I’ve replaced has affected the idle at all.

I’ve had the car smoke tested at my local mechanic and they found no leaks. I’ve also sprayed brake cleaner around my vacuum lines and intake manifold and found nothing.

Here are some other symptoms besides the idle:

Cruise control light comes on, but it does not work.

Me and a friend were in there trying to figure something out today, and found that it idles at 1000 when the MAF is unplugged, albeit a very, very rough idle.

When the cruise control electrical connector is unplugged, the car surges at idle just like it does when rolling.

I am totally out of ideas for what it could be. Am I supposed to set up my parts like the IAC when I install them? Or is it something blatantly obvious? If anyone here is familiar with these cars or has anything to offer I would really appreciate it. Thank you!

Engine bay
Is the EGR opening and closing at the correct speed? Opens at 30 to 35 MPH and closes under 30 to 35 MPH
 

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2000 Silver GS manual
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Please use an OEM or OEM replacement IAC. I had the same problem and ordered ebay and amazon much cheaper ones. I knew it was to good to be true, but I had to try. Total waste, I ordered the correct OEM part and instantly idle returned to normal and CEL went out! You get what you pay for.
 

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Having the exact same issues here. Replaced the same parts, with the same results. Can't find any vacuum leaks either.

Please use an OEM or OEM replacement IAC. I had the same problem and ordered ebay and amazon much cheaper ones. I knew it was to good to be true, but I had to try. Total waste, I ordered the correct OEM part and instantly idle returned to normal and CEL went out! You get what you pay for.
I tried an OEM IAC as well with no change, so I don't believe that it would be OPs issue either.
 

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2005 Spyder GT
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292 Posts
I would double-check that you installed the correct parts, by part number, and the condition of any connectors. The parts databases of autoparts stores are often wrong, and new parts are often faulty.
 
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