2001 V70 XC AWD Sudden idle surge P1171

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Silver1962
Posts: 7
Joined: Wed May 04, 2011 4:20 pm
Year and Model: 2001 V70XC AWD
Location: Riverside,CA

2001 V70 XC AWD Sudden idle surge P1171

Postby Silver1962 » Wed May 04, 2011 4:36 pm

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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flylow
Posts: 56
Joined: Thu Nov 04, 2010 3:34 am
Year and Model: V70-T5,2001
Location: Los Angeles, CA

Re: 2001 V70 XC AWD Sudden idle surge P1171

Postby flylow » Wed May 04, 2011 5:18 pm

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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jblackburn
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Re: 2001 V70 XC AWD Sudden idle surge P1171

Postby jblackburn » Wed May 04, 2011 5:45 pm

$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
2012 Chevy Cruze LT 6MT


A learning experience is one of those things that says, "You know that thing you just did? Don't do that."

mercuic: Long live the tractor motor!

Silver1962
Posts: 7
Joined: Wed May 04, 2011 4:20 pm
Year and Model: 2001 V70XC AWD
Location: Riverside,CA

Re: 2001 V70 XC AWD Sudden idle surge P1171

Postby Silver1962 » Wed May 04, 2011 11:21 pm

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 Thu May 05, 2011 3:11 pm, edited 1 time in total.

Silver1962
Posts: 7
Joined: Wed May 04, 2011 4:20 pm
Year and Model: 2001 V70XC AWD
Location: Riverside,CA

Re: 2001 V70 XC AWD Sudden idle surge P1171

Postby Silver1962 » Wed May 04, 2011 11:22 pm

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.

Silver1962
Posts: 7
Joined: Wed May 04, 2011 4:20 pm
Year and Model: 2001 V70XC AWD
Location: Riverside,CA

Re: 2001 V70 XC AWD Sudden idle surge P1171

Postby Silver1962 » Mon May 09, 2011 3:29 pm

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?

Silver1962
Posts: 7
Joined: Wed May 04, 2011 4:20 pm
Year and Model: 2001 V70XC AWD
Location: Riverside,CA

Re: 2001 V70 XC AWD Sudden idle surge P1171

Postby Silver1962 » Wed May 11, 2011 4:02 pm

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.

Silver1962
Posts: 7
Joined: Wed May 04, 2011 4:20 pm
Year and Model: 2001 V70XC AWD
Location: Riverside,CA

Re: 2001 V70 XC AWD Sudden idle surge P1171

Postby Silver1962 » Fri May 20, 2011 9:17 pm

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.

mello151
Posts: 5
Joined: Mon Aug 02, 2010 5:48 pm
Year and Model: S70 1999
Location: Atlanta, GA

Re: 2001 V70 XC AWD Sudden idle surge P1171

Postby mello151 » Tue Nov 08, 2011 7:29 pm

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.

Silver1962
Posts: 7
Joined: Wed May 04, 2011 4:20 pm
Year and Model: 2001 V70XC AWD
Location: Riverside,CA

Re: 2001 V70 XC AWD Sudden idle surge P1171

Postby Silver1962 » Tue Nov 08, 2011 7:48 pm

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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