Idle problems and loss of power, help!
So I replaced my IAC valve about 2 months ago and everything was fine until I started up me car yesterday and it wouldn't hold an idle. I had to keep my foot ok the gas petal until it warmed up. I also then pulled a p0505 code which is the iac.
I then went to drive it and noticed a loss of power pretty much throughout the whole band and especially about 3k rpm. Feels like the turbo isn't kicking in as much as it should be. My question: is this because of the IAC or is something else wrong that may have tripped the p0505 code. I did some research and maybe it's a boost leak or vacuum leak? Please help because I am afraid to drive my car is there is something terribly wrong. P.S. I should mention I took out the iac valve and cleaned it and it looked fine but my car is still running crappy after replacing it. |
Yea I'm 99% sure its a leak dnt really trust scanners that much cuz they can't detect things Like this.. Do a boost leak test i had da exact problem
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Alright well I'm going to try to change the iac anyways cause its under a warranty since its still new. I'm hoping that will fix the idle at least. Could the boost leak also cause the idle problem or just the power loss?
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If the leak is bad enough, you're likely to experience everything you mentioned. Do a boost leak, and also check the MAF.
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So I just replaced the iac and it idled up fine but now the idle won't come down once it's warmed up, it just stays stuck around 2k rpm. So I took it for a test drive and when I stop drops to 1000rpm then back up to 1500. Then up then down then up then down quickly, until it finally goes up to 2000 again and stays. Is this from a boost leak???
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vacuum leak. tb shaft seals? also remove the UICP and make sure the throttle body does not have residue where the butterfly closes and opens
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Originally Posted by sourtowel
(Post 10727656)
vacuum leak. tb shaft seals? also remove the UICP and make sure the throttle body does not have residue where the butterfly closes and opens
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let us know what he says
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Check your maf sensor . I'd say you probably have a huge boost leak somewhere . Possibly could be your oil feed line to your turbo also check and see if there's any oil anywhere
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i had this happen to me a few months ago, high idle and all, it was the throttle body shaft seals, one i replaced those, with a new IAC my idle went back to normal, also remeber to disconnect your battery when swapping out electrical stuff.
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Originally Posted by blackmambe_evo7
(Post 10727646)
So I just replaced the iac and it idled up fine but now the idle won't come down once it's warmed up, it just stays stuck around 2k rpm. So I took it for a test drive and when I stop drops to 1000rpm then back up to 1500. Then up then down then up then down quickly, until it finally goes up to 2000 again and stays. Is this from a boost leak???
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Originally Posted by STiKillerr
(Post 10728210)
let us know what he says
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Originally Posted by Mikey15
(Post 10728626)
Check your maf sensor . I'd say you probably have a huge boost leak somewhere . Possibly could be your oil feed line to your turbo also check and see if there's any oil anywhere
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So, i had a feeling that i still had a boost leak after all of this and I just installed a boost gauge. At idle the vacuum is only around -13. I know that is should be around -18 or so when stock so I checked all of my air hoses to the turbo and intake mani and couldn't find and holes.
Any idea what else to check before doing a complete boost leak test as I don't yet hve the tools or time for this? Just FYI just in case these mods may change anything with the vacuum I have: turbo back exhaust w/ down pipe and a K&N intake with upper and lower inter cooler piping |
Well if u have a problem with the idling, I'd get my hands on a scanner or laptop with datalog capabilities not a code reader, if your idle isn't coming down I'd look into maybe a faulty tps sensor.....that one is somewhat easy to check, check the volts at idle with it. It's on the side of your throttle body.... That could be bad or if your boost leak test was done right, it'll tell you if you have a leak at your throttle body seals as well.....good luck...I hate boost leaks myself..haha
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