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2001 V70 XC AWD Sudden idle surge P1171

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2001 V70 XC AWD Sudden idle surge P1171

Postby Silver1962 » 04 May 2011, 16:36

When decelerating, downshifting, I get a sudden surge from about 500 - 1100 RPM. Foot is on brake (thankfully) and then while in park the idle will stay okay for a minute, then it surges slightly. AC is not on. Major problem is getting costly.

I have had this problem for awhile. In 2009 I replaced the O2 sensors (At Dealer! $1200.) and that didn't stop it. Still got P1171 codes. Cleaned the MAF and it went away for awhile. Recently it (P1171) came back with a vengeance. I took it to Firestone. Troubleshot one thing at a time. P1171 is a general code for many fuel mixture issues, they say. I since replaced the injectors. still P1171. Firestone replaced the MAF and it didn't change anything, so they sent it back N/C. It is suggested to look at the Throttle Position Sensor.

Any Ideas? I almost hit someone and this surge is going to cost me, dearly. I can't drive 50 miles after a reset without the CODE coming back.

If I replace injectors or sensors, do I have to have the "computer" reprogrammed?
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Re: 2001 V70 XC AWD Sudden idle surge P1171

Postby flylow » 04 May 2011, 17:18

Here is what alldata says,

Condition
The control module receives information from the heated oxygen sensor (HO2S) about the fuel/air mixture when idling at both the lower and upper part-load range - If the fuel/air mixture deviates from [lambda]=1 the short-term fuel trim will compensate for this by adjusting injection time so that [lambda]=1 is achieved. When the short-term fuel trim makes an adjustment, the integrator median must be adjusted by the long-term trim. Diagnostic trouble code (DTC) ECM-261A will be stored when the long-term trim must be adjusted to maximum in the lower part of the load area.

Condition
none

Possible source

Upper limit:

* intake air leakage
* exhaust system air leakage
* low fuel pressure

Lower limit:

* intake air leakage
* high fuel pressure
* leaking injectors
* defective mass air flow (MAF) sensor
* contaminated engine oil
* oil level too high
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Re: 2001 V70 XC AWD Sudden idle surge P1171

Postby jblackburn » 04 May 2011, 17:45

$1200 for O2 sensors?!

Sounds to me like you've got a vacuum leak. Inspect any vacuum lines you can find for cracking; it's about that time for it to start happening.
'98 S70 T5 218K miles
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Re: 2001 V70 XC AWD Sudden idle surge P1171

Postby Silver1962 » 04 May 2011, 23:21

Great replies so far. Here is the list of stuff I have already checked:

* high fuel pressure (Firestone says it is at normal limits)
* leaking injectors (I replaced tham all myself with OEM rebuilds)
* defective mass air flow (MAF) sensor (Ruled out by Firestone)
* oil level too high (Nope, a little low - checked today. Golden brown - a little used)
* contaminated engine oil (Had the engine flushed a month ago. Serious sludge created by a stop leak type of product. I have a rear engine main seal leak.)

This I Need to address:
* intake air leakage

I will post my findings. Any idea about the throttle position sensor? Throttle body cleaning? Another sensor? I am trying to avoid going to Volvo. They are too darned expensive and I can't just throw parts at the car. I am a student on a really fixed budget - this is my dad's car and he is broke as *.
Last edited by Silver1962 on 05 May 2011, 15:11, edited 1 time in total.
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Re: 2001 V70 XC AWD Sudden idle surge P1171

Postby Silver1962 » 04 May 2011, 23:22

jblackburn wrote:$1200 for O2 sensors?!

Sounds to me like you've got a vacuum leak. Inspect any vacuum lines you can find for cracking; it's about that time for it to start happening.


Ontario Volvo Dealer: $1200 for two sensors and labor. OUCH! Yes, dad paid for that one.
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Re: 2001 V70 XC AWD Sudden idle surge P1171

Postby Silver1962 » 09 May 2011, 15:29

I checked the vacuum lines this weekend using carb cleaner; sprayed it along the lines to observe an idle surge caused by vapors. None! So, I called Volvo and they suspect it is the throttle body. I will probably take the car in to Volvo and pay the $100 diagnostic to see if they can narrow it all down to one item. Then I will replace it myself. Any comments?
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Re: 2001 V70 XC AWD Sudden idle surge P1171

Postby Silver1962 » 11 May 2011, 16:02

All other advice I am getting is that the throttle body may be in need of thorough cleaning. According to a maintenance release from Volvo through Mitchell, the turbo causes a buildup of carbon in the throttle body and careful thorough cleaning will stop rough idle problems. removal of the throttle body and cleaning the ports,sensors, and reinstalling should correct it. After this weekend I will post the results of my adventure.
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Re: 2001 V70 XC AWD Sudden idle surge P1171

Postby Silver1962 » 20 May 2011, 21:17

After spending a few hours cleaning everything and searching in vain for a vacuum leak, I went to a local Volvo specialist and they diagnosed the problem ($95). It is the TCM Throttel Control Module. This seems to be a problem on this model year. It isn't fixed by a novice, either. Once installed, the car needs a download to reprogram teh whatever... Too much. This is a costly repair and Volvo had a 10 year extended warranty on this problem. That warranty ran out for me on Dec 6, 2010. No one told me: Bummer! So, I have to shell out $1300. The shop thinks this will solve my Long Term Fuel Trim code (P1171), if not, it will be easier to locate once the TCM is replaced. I will update this post when the repair is done and problem solved. Thanks for your input.
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Re: 2001 V70 XC AWD Sudden idle surge P1171

Postby mello151 » 08 Nov 2011, 19:29

Did the new TCM fix your issue? I'm having the same problem, but with a '99 S70, and don't look forward to shelling out ~$1300 to fix it.... So far I've tried replacing the O2 sensors and cleaning the MAF.
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Re: 2001 V70 XC AWD Sudden idle surge P1171

Postby Silver1962 » 08 Nov 2011, 19:48

Sorry I haven't replied in a long time. What had happened to my engine is the following: I used the wrong oil and also used a leak stopper. The engine was plugged up really badly. The low oil pressure was an underlying problem that was not being addresses, so the were no vacuum leaks or TCM problmes. To resolve the low oil pressure would have fixed everything - unfortunately for me, a new engine. $4,000 for using the wrong oil (my dad's car and his recommendation to use 50W oil instead of 5w 30w as recommended). Lesson learned - Volvo engines are high performance engines, do not mess around - it gets costly. Now the car runs great and no issues with the TCM (which is being watched because it is the one that was recalled and so far it still operates well. One day it too will fail...)
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Re: 2001 V70 XC AWD Sudden idle surge P1171

Postby mello151 » 10 Nov 2011, 18:07

Thanks for the update. Wow, that's crazy! The wrong oil ruined an engine...

I'm trying to think to all the places I've had the oil changed now.... I sure hope this is the case for me because $4k for a new engine is more than I think my car is even worth :)
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Re: 2001 V70 XC AWD Sudden idle surge P1171

Postby wooded » 13 Nov 2011, 00:20

I had this exact surging on my 2001 with 205K that was there when i bought it at 189K. i recently did the pcv system changover due to proactive ocd during that i did the elec throttle cleaning with seafoam, etb cleaner and brass brush and a new gasket. there was the dark crud, but i thought it wasnt bad slightly open good spring. after putting it all back together and it actually started!! my idle smothed out at stops and no surge. this is the one time something actually changed dramatically. iw ould reccommend to all to do the throttle body cleaning. dont bother trying to getting the 4 bolts from below. do yourself a favor and remove the electric cooling fan 3 connectors and 2 bolts to give you room, saves the knuckles and the childrens ears ....son of a b****. although you need to disconnect the connector lower r front under. since i had my intake manifold out i had room. the electric connector for my throttle body would not pass between the starter and block. so you may not have much play to spray and clean. again this was the most dramatic repair ive ever done. do it if you have the issue. it shouldnt take more than 1.5-2 hours total
2002 BMW X5 3.0
2001 v70XC 206K
2002 v70XC 173K
96 850T wagon 194K-sold,
2004 Cadillac SLS- sold
2004 Chevy Avalanche 42K
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