Volvo RWD 700 Forum

INDEX FOR 10/2025(CURRENT) INDEX FOR 10/2011 700 INDEX

[<<] [>>]

THREADED

THREADED EXPANDED

FLAT

PRINT ALL

MESSAGES IN THIS THREAD

REPLY TO THIS MESSAGE

SAVE

RPM out of tolerance 1988 / 760TURBO 700

posted by Jay De Silva on Wed Apr 21 11:25 CST 2004
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS]

[IGNORE ALL POSTS]

last visit: Tue Apr 10 04:13 CST 2007

[RELATED]

Hey guys,
My 1988 760 TURBO failed smog. I do not know what is thermostatic air cleaner is. How to fix this. If RPM out of tolerance will tune up fix it? I'm in california. So greatful for this site.
Thank you
jay

REPLY TO THIS MESSAGE

Replies to this message will be emailed.

SAVE

RPM out of tolerance 1988 / 760TURBO 700

posted by john sargent on Sat Apr 24 07:16 CST 2004
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS]

[IGNORE ALL POSTS]

last visit: Wed Oct 22 09:07 CST 2014

[RELATED]

There is a thermostatic valve in the bottom of the air cleaner. This valve selects pre-heated air when under cold operating conditions. There is a corrugated aluminum hose connecting the heat muff on the exhaust to the air cleaner. The hose needs to be installed. I don't know if the action of the thermostatic valve is checked in CA, but it is not checked in WA or OR.

Go to the 700/900 FAQ and set the Basic Idle Speed and Mixture. Install a new set of spark plugs and check the timing. That is a good start.

--
john

REPLY TO THIS MESSAGE

SAVE

RPM out of tolerance 1988 / 760TURBO 700

posted by someone claiming to be Chrissij on Wed Apr 21 15:17 CST 2004 [RELATED]

We don't have emissions tests here...and failed RPM? Revolutions per minute? What does how high you're idling have to do with anything...must be a "smog" term I don't understand. There is an air filter box thermostat on your car...but it does nothing for cleaning air...just killing air mass meters when it fails...

Just a query...if one has to run lean to pass the emissions test...so long as you have a full tank...couldn't one just pull the fuse for the pre-pump? You'd run a bit crappy for the test, but...Just a thought...

REPLY TO THIS MESSAGE

SAVE

RPM out of tolerance 1988 / 760TURBO 700

posted by Jay De Silva on Fri Apr 23 03:53 CST 2004
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS]

[IGNORE ALL POSTS]

last visit: Tue Apr 10 04:13 CST 2007

[RELATED]

Chrissiji,
Thank you so much for your thoughts. I'm in california. How can I locate the box. RPM readings were,
NO (PPM)
Max My Car
791 1544 @ 15 MPH
730 1484 @ 25 MPH
I'm getting too much HC at 25MPH. On the report say's that Eng. Speed failed!

REPLY TO THIS MESSAGE

SAVE

RPM out of tolerance 1988 / 760TURBO 700

posted by someone claiming to be Chrissij on Sat Apr 24 06:48 CST 2004 [RELATED]

Like I said...no emissions test here...so I'm a bit lost...

I'm "assuming" (and we all know about assuming), that HC is HydroCarbons, indicating that (again, I think) that your "fuel trim" isn't functioning properly. The system goes through a rich, lean cycle to burn/clean the exhaust gases created by your car. Again, and this is a guess, either your 02 sensor isn't working properly, or your car is running a bit rich, or c) both of the above...what is your gas mileage like?

And I would still like someone to answer...would pulling the pre-pump fuse for the test alleviate this problem?

<< < > >>

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.