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#1
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Fast Idle when cold?
Don't know if it's related, but twice since getting my water pump replaced, even though the car is warmed up (according to the temp gauge) the idle has stayed at 1100rpm, not gone down all the way to 750. This has only happened on fairly cold days, and it's as if a fast idle device is stuck. Is there a "fast idle" valve or switch on this car? If not, what could be causing this? Eventually on both occassions the car idled as normal, but held at 1100 for much longer than usual -- as if something is starting to stick... I hope this makes sense. Any thoughts? Thanks.
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#2
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It could be one of a few things. More than likely you need to remove and clean the throttle body and the device under it - the IAC, otherwise known as the idle air controller. Oil vapors collect in the t-body and IAC and gum them up. It's common to almost every car with electronic injection.
Another cause may be if you have disconnected the battery and the ECU is relearning its idle routine. (this may also occur after cleaning the t-body) It took mine 3-4 days to complete the relearn procedure, no driver intervention required.
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ASE Certified Master Automotive Technician w/L1. ASE Certified Master Medium/Heavy Truck Technician. Certified EVT (Emergency Vehicle Technician) |
#3
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How much of a pain is removing this stuff? I think my PCV valve is also clogged and in need of cleaning or replacement.
CJ |
#4
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Well.. the temperature gauge is your coolant temperature, not your engine oil temperature. Perhaps your engine is warmed up completley but the coolant is.
>shrug< - Ca$h |
#5
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Mike 92 LSL Teal 103k 00 RS 2.5 Silverthorn Metallic 36k 68 Chevy Camaro 07 Forester XT Sport |
#6
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Ron.
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Good s**t happened. 69 was worth the wait. '92 stock semi-pristine ebony - 160K '96 Grand Caravan - 240K '01 Miata SE - 79K '07 Chrysler Pacifica - 60k - future money pit. |
#7
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Quote:
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Mike 92 LSL Teal 103k 00 RS 2.5 Silverthorn Metallic 36k 68 Chevy Camaro 07 Forester XT Sport |
#8
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Ack. Retry: Alright, the temperature guage in the SVX is hooked up to a sensor that reads how hot the engine coolant is correct? Maybe the SVX's ENGINE (not the coolant) oil temperature is not that high yet so it continues to idle kinda high. Just a thought.
- Ca$h |
#9
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Quote:
__________________
Mike 92 LSL Teal 103k 00 RS 2.5 Silverthorn Metallic 36k 68 Chevy Camaro 07 Forester XT Sport |
#10
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A lot of German OEMs use oil temp as a means to determine engine temp when performing diagnostics (especially air cooled VWs ), but I can't remember actually seeing an on-board sensor. As far as I know all OEMs use a separate water temp sensor for the ECU and another for the gauge.
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ASE Certified Master Automotive Technician w/L1. ASE Certified Master Medium/Heavy Truck Technician. Certified EVT (Emergency Vehicle Technician) |
#11
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Quote:
just a quick play-by-play: remove both plastic covers on the top of the engine. the PCV valve is under the rear of the rectangular plastic cover (with the allen bolts) - it threads in at an angle upwards towards the front of the car. you'll have to pull the hose off, and using a 19mm crow's foot wrench, loosen it. this is what is so hard - there is VERY LITTLE room to move in that little U-shaped notch. removing and tightening the new one takes a long time and kills your back. i was able to CAREFULLY reach my arm in from the rear of the engine compartment to get under the PCV (avoid disturbing wires and hoses) to hand loosen and tighten as much as i could. i can't remember, but you may need to put some teflon tape on the new PCV threads. don't use this as a How-To guide - i just wanted to give you a quick idea of what's involved. do a search - i found an excellent write-up somewhere. good luck!
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Alan 1987 928 S4 (Black) SOLD! 1997 SVX LSi (Ebony) SOLD! 2005 Legacy GT (Silver) [Cobb Stg 2+] SOLD! 1987 928 S4 (Black) SOLD! 2005 Forester XT Premium (Crystal Gray Metallic) SOLD! 2008 Lancer Evolution X MR (Apex Silver) [Cobb Stg 1+] 2015 Outlander Sport 2.4GT AWD (Mercury Gray) 2013 G37xS (Obsidian Black) |
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