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02 XC70 shuddering at idle Topic is solved

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shafe36
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Joined: Thu Feb 15, 2018 11:38 am
Year and Model: 2002 XC70
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02 XC70 shuddering at idle  Topic is solved

Post by shafe36 »



I was going to get an oil change today. That's where I was headed when I turned the car on and it was shuddering almost as bad as I was after I noticed it.

I checked the air filter before I got in, snapped it back in and turned the car on. Yesterday, it was fine. Or it wasn't bad enough for me to notice, if it wasn't fine.

It stays pretty comfortably at 1000rpm according to the Rev meter, but it seems like the rpms rise and fall, always culminating with a shudder that shakes the whole car at the peak.

I haven't found anything online that matches what my car is doing exactly. No recent repairs or shop visits other than a couple new tires in the back. I'm baffled.

I'm happy to provide as much info as I can, thanks in advance for all your guys' help
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Rattnalle
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Re: 02 XC70 shuddering at idle

Post by Rattnalle »

The idle seems to high as well. Has it always been like that? IIRC the NAs idle at about 800 and at least the 2.5T at 650, I'm guessing the 2.4T should be about the same.
shafe36
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Joined: Thu Feb 15, 2018 11:38 am
Year and Model: 2002 XC70
Location: Ohio, US

Re: 02 XC70 shuddering at idle

Post by shafe36 »

Yeah, I'm pretty it's always been around 1000 from what I remember. Granted, I've only had it about a year and a half
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Rattnalle
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Re: 02 XC70 shuddering at idle

Post by Rattnalle »

And I'm guessing it's a 2.4T since it's an -02? Never owned one of those, just test driven, so I'm not sure about the idle but it should at least be as low as the NAs which have been around 800 since the 850 for the straight 5.
shafe36
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Joined: Thu Feb 15, 2018 11:38 am
Year and Model: 2002 XC70
Location: Ohio, US

Re: 02 XC70 shuddering at idle

Post by shafe36 »

Yep, 2.4. Reading around, it looks like it is running high. I suppose more symptoms makes it a little easier to diagnose. I've heard a million and one different diagnoses so far
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Re: 02 XC70 shuddering at idle

Post by jonesg »

shafe36 wrote: Thu Feb 15, 2018 12:54 pm Yep, 2.4. Reading around, it looks like it is running high. I suppose more symptoms makes it a little easier to diagnose. I've heard a million and one different diagnoses so far
What do the codes tell you?
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Re: 02 XC70 shuddering at idle

Post by abscate »

Cars are way too complex to diagnose by symptom. You will typically take 2-3 hours to check subsystems for faults to find what's causing a problem. It's 2-3 hours of your time or the mechanic time, who might be a bit faster.

Here I would start with finding the vacuum diagram and removing and checking each hose for splits tears and holes.

When were the ignition parts, coils and plugs, last checked or replaced?
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shafe36
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Year and Model: 2002 XC70
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Re: 02 XC70 shuddering at idle

Post by shafe36 »

Thanks for trying to help guys! I changed the plugs and put some fuel system cleaner in Sunday. I accidentally bumped the air filter and, lo and behold, the problem went away for a second. Looks like the MAF was bad and choking out the rest of the engine. I unplugged for a few minutes and it ran like a dream! The RPM even went down to around 800 at idle. New one is on the way! All is well. Thanks again!
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Rattnalle
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Re: 02 XC70 shuddering at idle

Post by Rattnalle »

Nice accidental trouble shooting there :)
shafe36
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Joined: Thu Feb 15, 2018 11:38 am
Year and Model: 2002 XC70
Location: Ohio, US

Re: 02 XC70 shuddering at idle

Post by shafe36 »

Hey, I'll take it :D
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