my (haines) manual tells very little about tune up on my 89 240. B230F
it has an air mass meter measuring the air intake , and there is a air
control valve underneath the intake manifold. in the book I have it
shows the air fuel mix being adjusted by a screw on the air mass meter
, but mine has no such adjustment.

I just finished rebuilding the engine. new pistons etc. etc. etc., the
works.. it is in fine shape , mechanically, but still it failed the
emmisions test.

there is an switch on the on the throttle body and it seems to
influence the air valve. I adjusted it a little to make sure it is
closed and that just made the car fluctuate at idle.

I would appreciate it if anyone can point me in the direction of any
good info on the subject, or fill me in on how the system works.
what can I check with a meter? or a scope? is there a screw somewhere
to adjust airflow or something?

also I have heard about reading the fault codes, and would like to
learn more about how they work.

I can and will have my experienced volvo mechanic look at The car , he
is great. Still , I like to do almost all my own work on my 122 ,
244 and 245 and we have a bunch more volvos in the family, so it would
be nice to learn a little more...

thanks, Phil

There's nothing to adjust on the 89. It is all troubleshoot, clean, restore or replace. No dials, no knobs, no screws, unless you count the stop screw for the throttle plate and the slotted holes in the TPS.

Depending on what type of emissions test failure you had, it may need an oxygen sensor or cat. I'm making the bold presumption yours isn't an EGR model.
--
Art Benstein near Baltimore

Phil,

For a start, go to the Features pull-down menu at the top of the page and select 700/900 FAQ. We all use basically the same engine, ignition, and fuel systems—so you'll find a lot there. Fault codes too (see OBD)

Secondly, since you've put so much into your Volvo, you really need a good manual. Haynes is OK, but I've hardly looked at mine since I got the Bentley 249 service manual back in 1990. Last I knew it was only about $30 at eeuroparts.com, with free shipping on orders over $39 (buy filtes or something).

You must go "by the book" on things like that Idle Air Bypass knob (used for setting "Base Idle" speed) and the Throttle Position Switch. There is a simple series of adjustments in that area—simple, but sequential.

Hit the FAQs, get the Bentley, and

Good Luck,

Bruce
--
Bruce Young,
'93 940-NA (current)
'80 GLE V8 (Sold 5/03)
'83 Turbo 245
'76 244 (lasted only 255,000 miles)
73 142 (98K)
'71 144 (track modified--crusher bound)
New 144 from '67 to '78
Used '62 122 from '63 to '67

I'm sorry I can't answer your specific question - both my 88s have the adjustment screw on the AMMs, though one of them has a round plug over the screw that you have to drill out. But I will pass along the word that the Bentley manual is far more thorough about the FI system for all the years than the Haynes manual.

There isn't an adjustment on the AMM in 1989, 88 was the last year for that. With the new computer system on the late 240s, there's not much ajusting that can be done on anything.
--
1991 245, 61k miles, looking for a 5 speed 92-93 245 cheap.