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Rough Idle, Surging, No throttle. URGENT HELP PLEASE S70 1999

posted by  slicer89 on  Tue Sep 24 16:39 CST 2013
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last visit: Thu Oct 10 21:54 CST 2013
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Just bought a 99 S70 sedan, It has about 195k miles on it. Drove fine all day, No issues. Went into walmart, Got some oil and new headlight bulbs.. Installed the lights and put the oil in.... Tried to start, and it wouldn't... and when it finally did, I didn't have any throttle, And it kept surging. When it would idle, It was almost like it was missing.... I could give it throttle, But it would barely go above 2k RPMs.

If I turn it off, and then turn it back on.. First try, It stalls... Start it up again, It revs (ON IT'S OWN) to about 3k RPMs.. Then drops down, Sometimes it'll rough idle like it's missing, Other time it just sits there and surges up and down... I push the pedal, and it'll rev a tiny bit then go back to surging.

What's the problem?

I don't think my CEL even works... Because even when I turn the car on, It doesn't come on.

Well, Heres where it gets real weird.... I tried starting it today after it sat all night long... And it started up just fine! Idled fine, Revved fine and everything! So I let it run for abit... Came back outside.... Yep, Sure enough... idling rough, Surging, and not revving past 3k RPMs.

So I checked for air leaks, It had a few... Fixed those, Cleaned the sensor in the air box and in the air intake hose, Unhooked the battery for a while.... (This was after it sat for a while again) and it started up just fine again, revved fine, idled fine.... then I guess once it "warmed up" it started idling really rough and not revving like it should.








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    Rough Idle, Surging, No throttle. URGENT HELP PLEASE S70 1999

    posted by  Herb Goltz on  Mon Sep 30 08:13 CST 2013
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    last visit: Fri Oct 24 13:23 CST 2014
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    The first thing to do is to read the codes-- otherwise you're just guessing. Read the codes and post back for help. Does the ETS (electronic throttle system) light come on at start-up? Any other warning lights?







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    Rough Idle, Surging, No throttle. URGENT HELP PLEASE S70 1999

    posted by  KlausC on  Tue Sep 24 19:42 CST 2013
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    last visit: Fri Oct 24 10:15 CST 2014
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    There is no single magic wrench to fix your car. First, we don't know what codes are being produced. If you 'found' a few air leaks, there are probably a few more. Follow all of the vacuum lines from the intake manifold and make sure they are solid, including to the fuel pressure regulator.

    Your car has an electronic throttle, it may be acting up. Check the temperature gauge in the dash, does it go up steadily to the mid point or stay down at the bottom? If the latter, the thermostat is hosed.

    What do the 5 spark plugs look like? If they are covered in fuel, you may have a bad O2 sensor or more leaks.

    The list goes on and on... and we have so little data







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