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Discussion Starter · #1 ·
Well, the subject sort of says it all...<p>I have a 2000 Volvo C70 HPT Coupe, 5-spd. Recently, on cold mornings (the only kind we've had lately though) the car starts fine, but idles extremely rough (fluctuating between 200-1000 rpms about each half second). If you give it a little gas it lessens the problem, but it's still there. After about 30 seconds to a minute of running the problem is completely gone. <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/confused.gif" BORDER="0"> <p>I did some searching on this board, and brickboard, and volvospeed. I had the battery tested, it's fine. I hooked it up to the computer, no codes (no CEL either). <IMG NAME="icon" SRC="http://www.vwvortex.com/zeroforum_graphics/screwy.gif" BORDER="0"> <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/confused.gif" BORDER="0"> <p>About 2000 miles ago I had the oil changed (mobil 1), air filter changed (K&N drop in), spark plugs changed (Volvo OEM) and put on my winter wheels/tires (anyone know a good place to get some not <I>too</I> ugly hubcaps for my ugly 16" steel wheels?). <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/cool.gif" BORDER="0"> <p>This problem has been occuring for about a week now.... so I can't imagine it's too related to any recent maintenance, or the weather change.<p>Lucky for me my warranty expired in late december, <IMG NAME="icon" SRC="http://www.vortexmediagroup.com/images/banghead.gif" BORDER="0"> <IMG NAME="icon" SRC="http://www.vortexmediagroup.com/images/banghead.gif" BORDER="0"> <IMG NAME="icon" SRC="http://www.vortexmediagroup.com/images/banghead.gif" BORDER="0"> so I don't want to take it to the money-pit... <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/rolleyes.gif" BORDER="0"> I mean dealer.<p>Any suggestions? I read vacuum leak on a few posts, but I'm not sure how to check for that. <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/confused.gif" BORDER="0"> <p>I popped open the hood last night and started it up to see if maybe I'd see some arcing (one cylinder not going off right?) didn't see anything, but then again didn't really know what I was looking for. <IMG NAME="icon" SRC="http://www.vwvortex.com/zeroforum_graphics/screwy.gif" BORDER="0"> <p>I thought it might be a frozen fuel line, but it happens with a full, and an empty gas tank, so I'm kinda cancelling that one out. <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/mad.gif" BORDER="0"> <p>It happened this morning, which was about 33 degrees and sunny, much warmer than recent days, so I guess it's not too temperature dependent. (I'd appreciate a 60 degree day, for testing purposes of course, if anyone could arrange that.) <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/biggrin.gif" BORDER="0"> <p>Well, I'm all out of ideas, I hope someone has one! <IMG NAME="icon" SRC="http://www.vortexmediagroup.com/images/banghead.gif" BORDER="0">
 

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Re: Rough idle at start when cold, gone after 1 minute? (sctyboy)

I have experienced the same thing on days around 20 degrees or lower. As soon as I get on the gas pedal a little it goes away. I think it might simply be normal for a cold car to idle a little rough when its that damned cold out.
 

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Discussion Starter · #3 ·
agreed a rough idle is normal when it's that cold, but not this rough... this is most definetely not a normal idle problem
 

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<br>2 things to try.<p>1- another gas station.<p>2- Prime fuel system by turning key to position II two times then start engine.<p>rd
 

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Discussion Starter · #5 ·
Re: Rough idle at start when cold, gone after 1 minute? (sctyboy)

Well, I tried out the whole "priming the fuel system" thing and it seems to have worked!<p>If I turn the key to position 2 (on) for a few seconds before I start the car it starts up and idles as normal, with no problems.<p>What does this mean for me?<p>Bad fuel filter?<p>Thanks!<br>Scott Silverman
 

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<br>IMO - Not to worry. Think this effect is due to the cold.<p>Just a side note though. I had to change out my MAF sensor due to an intermittent CEL at about 48 months and come to think of it my cold winter starting seemed to be great ever since I did.<p>So moral of the story : if you start getting a code P1171 at around 48 months it will most likely be your MAF and maybe a close-to-broke MAF causes hard starting.<p>Also I use RedLines FI cleaner. Car seems to run nicely in this rediculously cold New York winter.<p>rd
 

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Re: (RD)

scty boy; I had exactly the same problem with my 2001 C70 hpt 5spd, which continued to get worse, to the point where the car would stall before I could drive away, and I couldn't re-start the car unless I first removed the key and then re-started the car. Seemed very strange... here is what the fix was, as per the dealer work order, which makes sense.<p>Cause: 10<br> 36625-2 Antenna Unit Immobilizer Replace<br> W93<br> 1 9442961 0 Antenna<br> 36001-2 Diagnostic Trouble Codes (DTCS) Reading/Resetting<p>This fixed it and I believe the car runs a little better since!<br>
 

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Discussion Starter · #8 ·
Re: (Duncan Mc)

Thanks for the heads up... now I know where to start if the problem gets any worse.<p>I assume your repair was done under warranty... do you happen to know what the cost was?<p>I'm out of warranty as of christmas, so I'm going to see if the problem doesn't get better when it gets warmer outside... otherwise time to start replacing immobilizers <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/smile.gif" BORDER="0"><p>Thanks again,<br>Scott
 

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Discussion Starter · #10 ·
I dunno, I'm pretty wary of sticking anything into my gas tank, except gas.... Appreciate the tip, though
 

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I had a like problem, and dealer downloaded new ECU software that fixed it. Would ask dealer to look for a cold start problem SW fix. I don't have the [atch number, sorry. This was year I believe.<p>Carl
 

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Re: (cargusjoh)

Hi.<p>I had a cold start rough idle and lumpy running problem.<p>Thought it could have been a leaky injector, but it wasn't. The throttle body was cleaned and refitted. Then, the delaer downloaded new software for the car and this seems to have completely fixed it.<p>The car now starts and runs fine from the moment you turn the key.<p>I would advise you to get to the dealer and ask for a cold start SW update.<p>Could be as simple as that. The very fact that there is an update means Volvo are aware of the problem.<p>Hope that helps.<br>Dan.
 

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You guys are gonna think im nuts...but if you have a weak battery, the care will run rough intermintently on starting--the reason for this is that for aprox. 5 seconds after start, the alternator is not charging--that battery is doing it all, so if its weak, the fuel pump cant keep up. if you ever start your car with the wipers on, you will see that after its on for that five seconds, the wipers speed up--when the alternator says hello. If the battery is original change it. Best of luck to everyone. <br>Matt
 
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