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Idling hiccup
Something I've been noticing lately is that my idle tends to intermittently hiccup. Meaning it will idle about 650rpm, then dip lower to I'm guessing 400.
I see this problem while sitting at red lights or even while just idling in my garage. It will not do this all of the time, but sporatically. The temp gage is at normal. Things to note: I have no codes shown, the car doesn't sputter, it drives great, and no loss of performance. MAF sensor (used but replaced 1-1/2 years ago) What could cause a problem like this or is something starting to fail? I hope its as simple as a defective sensor.... |
#2
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Re: Idling hiccup
Might be the idle air control valve? maybe it sticks once in a while?
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#3
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Re: Idling hiccup
I have a similar issue, but I noticed that it happens when I come to a stop, rather than once I'm already stopped. My plan is to seafoam it, making sure to hit the aux air control valve, then check for vacuum leaks, etc. Maybe clean/swap out the MAF for one of the other two I have.
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'94 Laguna Blue LSi ~159k.......JDM ultra short-geared 3.900 STi Version 7 6-speed w/ Cobb shortshifter, ECUtune 244,8.1mm/256,9.1mm i/e cams, group N motor mounts, '97 grille, JDM clear corners, Momo JDM Legacy GT steering wheel, apkarian's LED tails, silver STi BBS wheels, PWR radiator, redstuff pads f/r, drilled/slotted rotors, bontragerworks rsb #18, Koni/GC 450f/375r coilovers, Megan Racing adjustable lateral links, KMac c/c plates, Stebro exhaust, ECUtune 1v5, Optima battery in the trunk where it belongs. Turbo project '97 Ebony LSi ~137k #036.......Power mode mod, JDM clear corners, BBS wheels. AUX/pocket mod Now a mod "over there" ............Photo album |
#4
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Re: Idling hiccup
I hope it's not the IAC valve..isn't that a b*tch to take out??
I checked my codes again...normal check engine blinks. I may check it with the car temp normal and driving it to work to see if the code blinks that way. How much is a coil pack?...P/n, and where can I get a few in case I need them? |
#5
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Re: Idling hiccup
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#6
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Re: Idling hiccup
Each coil is around $80 from subaruparts.com or the site of your choice and probably not the issue here.
The coolant temp sensor can also cause a "surging" idle but usually only when the engine is cold. And no, it won't throw a CEL all of the time either. |
#7
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Re: Idling hiccup
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I drove today with my cel light blinking normally..so it's not picking anything up as an error, but maybe the coolant temp sensor is on the fritz? I bought some fuel injector cleaner as well...may try that tomorrow. |
#8
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Re: Idling hiccup
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