Volvo S40 The S40 is Volvo's most affordable sedan with all the amenities of a luxury sports car.

Really bizarre scary problem!

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Old 03-08-2009, 01:07 PM
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Default Really bizarre scary problem!

My car is idling really low, like 500. Sometimes it recovers and comes back up at stoplights, but sometimes it sits at 500 the whole time. It makes the car run very rough. Also, when slowing down, the idle bounces up and down before settling.

What could this be?
I'm taking it to the dealer tomorrow hopefully. Pray for me!
 
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Old 03-08-2009, 04:29 PM
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I would say maybe idle motor.
 
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Old 03-08-2009, 05:32 PM
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I cleaned the IAC and it maybe helped a little bit...
I was thinking maybe a vac leak.
I do not have a CEL or anything.
 
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Old 03-08-2009, 07:26 PM
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That leads me more to the idle motor messing up.
 
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Old 03-08-2009, 10:44 PM
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Originally Posted by tech
That leads me more to the idle motor messing up.

totally a thread hijack... totally love the new pic Tech. I want one like it!
 
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Old 03-09-2009, 08:54 AM
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I like it too!

Is the IAC the only thing that would cause a low idle. WHat about a vac leak? Would a vac leak set off a CEL?

This may help too: it only messes up when the engine is warmed up. It's fine when it's cold.
 
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Old 03-09-2009, 06:49 PM
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Possible a vacuum leak could cause it I would listed closely and see if you can hear it with the car running. Also there is a hose from the intercooler to the intake check and see if it is cracked.

Thanks on the pics that is Capo Cam I had him do it for me.
 
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Old 03-09-2009, 07:05 PM
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WHOA u got a vacuum in ur car that things must always be so clean !!!

How do u get that mod !!!
 
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Old 03-09-2009, 07:22 PM
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WHat am I listening for?
 
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Old 03-09-2009, 08:01 PM
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Like a sucking sound.
 
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Old 03-10-2009, 09:12 AM
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I have a EST CAI so it sucks a lot!
I need to have a freakin' garage! It's 27 degrees and freezing rain right now!

I was thinking about this. I haven't had the car up to highway speeds and temperatures in months. Do you suppose if I drove like 2 hrs on the interstate it might help?

How about the MAF? I wonder if I used some of the CRC cleaner on it it may help. I have the CAI with cone filter, the MAF could have some oil on it I suppose?
 

Last edited by Lyonsroar; 03-10-2009 at 10:28 AM.
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Old 03-10-2009, 06:41 PM
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Both are possible.
 
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Old 03-10-2009, 08:46 PM
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I'm taking it to the dealer ASAP. It's getting really scary. It lugs way down to 500-600 RPM's and then gradually comes back up. When it lugs down, all the lights in the cabin dim.

I want this fixed!
Pray for me!
 
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Old 03-10-2009, 09:01 PM
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I will pray for you!
 
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Old 03-11-2009, 09:58 AM
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I drove ~100 miles on the highway at 60-75 MPH and no change.
Bummer.
 
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Old 03-12-2009, 08:40 AM
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TEch, do you know if the IAC in a 2001 is the same as a 2000?
I was thinking of buying the one of the parts car being sold on here?
 
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Old 03-12-2009, 02:58 PM
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Ok, cleaned the MAF. Forgot to reconnect the electrical connection, drove around the block. DSA light stayed on. Remembered electrical connection. Went home, stopped car, fan continues running, reconnect MAF, CEL comes on (!!!!!). Drive around block, DSA light disappears, but CEL is still lit.


Made appt. for dealer tomorrow morning.
Screw THIS!!! It didn't even solve my problem!
 
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Old 03-12-2009, 08:52 PM
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Sorry any update yet?
 
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Old 03-13-2009, 08:35 AM
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CEL turned off, DSA light off.

Car is at the dealer about the low idle. $60 diagnosis charge.
 
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Old 03-13-2009, 11:38 AM
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Engine Coolant Sensor
New thermostat
Software (for the coolant sensor?)

Total: $421.33


Is this something I can replace myself?
No CEL
 


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