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#1
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Idling like an F1 car
wow this just popped up out of nowhere.. my car idles around 1500 rpms now. I've also had a weird hesitation problem for a while, could the iac be causing this? Any way to test it? I don't even know where it's located..
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Brian |
#2
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You mean the 1500rpm idle like when the car first starts up? Normal operation is cold start, idle at 1500rpm until at standard temp, then it drops to 300-400. I would check your TPS voltage, make sure it's as close to .5v as possible.
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*No SVX at the moment...* 1987 Winnebago Elandan 35' 2001 Yamaha Roadstar 1600 2004 Ford Excursion Eddie Bauer, 6.0litre Power Stroke Diesel - Daily Driver. Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well-preserved body, but rather to skid in sideways, scotch in one hand, body thoroughly used up, totally worn out and screaming HOOOOYA !!!!! |
#3
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If you shut it off, then restart it, does the idle correct itself?
If so, then it is likely the TPS
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Cheers! Gordon 1997 Ebony #308 113k "The Black Diva"SOLD 1992 Black over Liquid Silver 152k SOLD 1992 Ebony 251k 444 SOLD 1999 Silver SLK230 134k SOLD 1997 Green Outback 137k SOLD 2013 Honda Accord I4 SOLD 2015 Subaru Crosstrek 30k 2018 Tesla M3 30k |
#4
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TPS....no doubt about it
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1993 25th Anniversary Edition # 156 of 301 ~ 121, 488 miles ( SOLD TO svxfiles 8/6/06) 2006 Subaru Impreza 2.5i....5spd - My daily driver 2006 Subaru Legacy 2.5i -7k miles..Mom's daily driver 2,543 Member of the SVX World Network |
#5
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but how does the tps go bad it's mechanical, I've torn it open before and there's nothing to it.
It idles like that warm and cold.
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Brian |
#6
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Any check engine light codes?
Sounds more like something is sticking. You can try cleaning the tps.
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1992 Subaru SVX 5spd 1998 Pontiac Firebird Formula 1999 Chevrolet Camaro SS 2009 Subaru Forester - Mileage Junky 2009 Pontiac G8 GT 2017 Ford Mustang GT 6spd |
#7
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Same problem... well, mine sticks at 2,000 sometimes a little over, and it takes like forever to come down to 900, but if I gitve it some gas it will go up again.... plus I still have that rough running issue
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#8
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check engine light comes on sometimes when I first start the car.. then it'll be gone for days at a time. Maybe I'll hookup with budfreak sometime, he's around this neck of the woods..
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Brian |
#9
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Quote:
If you've had it apart before, do it again and use some good electrical contact cleaner.
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Dave - 03 Baja - 92 SVX - 86 Brat - 08 OB 3.0 |
#10
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It actually looked brand new when I looked at it last time, about 5 months ago..
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Brian |
#11
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The throttles are shut at idle and the required air is supplied via a separate circuit. When the engine is idling the throttles are bypassed via an idle air circuit. Provided the TPS is delivering the correct signal voltage, (0.5 volts) when the throttles are shut, and they are mechanically shut, there can be no adverse affects. This can be simply tested, as per my advice included within the how too stuff.
When the engine is cold, idle air is provided via the by-pass air control solenoid valve, together with the auxiliary air control valve. The latter is directly temperature operated and should shut as the engine warms up. The solenoid valve is controlled via a signal from the ECU, which depends on several sensors for the required information in order to set the idle speed for various conditions, when the engine is at normal running temperature. A diagnostic check should show up any of several possible faults, with the exception of the auxiliary air control valve, which is a very likely culprit. If this does not shut when the engine becomes warm, idle speed will be excessive, as is the exact symptom reported. N.B. There is a constant 12 volt supply to this valve, even though it is not involved with the TCU. An air leak post throttles, could also cause the problem. There have been reports of loose manifold bolts. However in view of temperature being a reported factor, this is a less likely cause. I hope this screed may be of some assistance.
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
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