The message to which you are about to reply is shown first. GO TO REPLY FORM



 VIEW    REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

1998 S70 with codes p0171 AND p0172 S70 1998

posted by  unggthat on  Thu Nov 11 08:09 CST 2010
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Thu Mar 6 10:37 CST 2014
[RELATED]

In my current stump-me-good volvo endeavor, I'm working at my sister's 1998 S70. It has horrible starts on cold mornings, sputtering and usually stalling a few times. When warm or when ambient temps are up, it runs like a top.

It has codes P0171 (fuel mixture lean) and P0172 (fuel mixture rich). They continually return if reset. I have now replaced the fuel filter, spark plugs, air filter, plug wires, cap, and rotor, all as other maintenance items. I have searched high and low for vacuum leaks and all seems tight. Yesterday, I put in a new engine temp sensor, to no avail.

Any guesses? I'm going to check the fuel pressure while cold on the weekend. Beyond a faulty regulator or pump, I'm thinking possibly MAF sensor or O2 sensor(s) could be the culprit, but I'm hesitant to start blind guessing on these expensive items. Anyone know how to test the MAF on these cars?

I'll post back if I discover anything new . . . this is a problem I haven't run into before!

Nate






USERNAME
Use "claim to be" below if you don't want to log in.
PASSWORD
I don't have an account. Sign me up.
CLAIM TO BE
Use only if you don't want to login (post anonymously).
ENTER CAPTCHA CODE
This is required for posting anonymously.
OPTIONS notify by email
Available only to user accounts.
SUBJECT
MODEL/YEAR
MESSAGE

DICTIONARY
LABEL(S) +
IMAGE URL *
[IMAGE LIBRARY (UPLOAD/SELECT)]

* = Field is optional.

+ = Enter space delimited labels for this post. An example entry: 240 muffler


©Jarrod Stenberg 1997-2022. All material except where indicated.


All participants agree to these terms.

Brickboard.com is not affiliated with nor sponsored by AB Volvo, Volvo Car Corporation, Volvo Cars of North America, Inc. or Ford Motor Company. Brickboard.com is a Volvo owner/enthusiast site, similar to a club, and does not intend to pose as an official Volvo site. The official Volvo site can be found here.