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FYI
I've been posting on a variety of issues over the last two months due to my 1988 244 DL failing a No. Va. emissions test for the first time and have gotten her through with numbers I haven't since 1999 and 2001.
So here's the whole story as I understand it. I've left out a lot hours of tests that checked out and no action was taken on.
Note that there were no noticed changes in MPG or starting before the test failure.
I get 21.5 mpg (+/-) and the engine turns over on the first turn or two of the starter.
Tests 15 mph 25 mph
HC CO NO HC CO NO
02/23/1999 14 0.01 193 23 0.01 132
02/23/2001 36 0.04 30 37 0.03 138
03/11/2003 16 0.05 1163 34 0.07 430
07/22/2004 Install platinum plugs that turned out to be a source of starting problems years and years later - I have not verified if they were the correct spec.
03/10/2005 Replace exhaust system with Bosal parts.
03/15/2005 22 0.16 836 13 0.17 916
03/12/2007 39 0.25 1397 25 0.19 1283
03/06/2009 51 0.25 1328 65 0.23 1521
03/17/2011 111 0.42 2765 45 0.21 126
pass pass fail pass pass fail
I back tracked a very quick and dirty paint over a crack with POR-15 and found that one of POR-15s combustion by-products is NO.
03/23/2011 - set up tach and timing light - warm engine
-- ground air control valve test point - engine RPM does not change
-- adjust idle knob 1/4 turn - no change in Tach; reset to original position.
- RPM stability problems start. Can't set stable idle speed.
03/25/2011 idle air control valve (IAC)
-remove
--clean with Valvoline Carburetor Cleaner
--electric test - high on one side
---center pin 12 V feed
----side pins to ground
alternately open and close valve - operates.
IAC looks okay.
03/26/2011 Notice very slow drip from radiator hose above distributor - tighten.
Car has an intermittent hesitation and lose of power at 20-25 mph.
03/28/2011 Big mpg drop - 15.43 mpg
03/29/2011 - Replace tail pipe and under axel pipe with Starla products and unlike the Bosal are the right size.
(I strongly recommend and investment in an exhaust pipe expander to get a good fit a connections)
Swap out Bosal catalytic convertor, resonator and rear muffler with original Volvo parts from 2005.
- Replace Oxygen Sensor (the air vents were partially blocked).
03/31/11 - Clean throttle body with carb. cleaner.
Free Retest Emissions.
15 mph 25 mph
HC CO NO HC CO NO
03/31/2011 171 1.94 115 145 2.04 1667
fail fail pass pass fail pass
04/02-2011 15.16 mpg
- Still having hesitation and idle stability problem.
04/12/2011 - Remove throttle body to access PCV oil vapor trap.
- Replace IAC (idle air control) valve
- Replace Temperature Sensor while I had throttle body off. The old sensor was not out of spec.
- Pull PCV Oil Trap, hoses and Flame Guard
-- no clogs, nothing noticeably dirty (I change my oil every 3,333 miles.)
-- wash with soap and water, dry
---install with new OEM ‘O’ ring (33mm ID, 1/8” dia)
- Check timing (still good)
04/16/2011 Mileage is back to normal - 21.23 mpg
04/17/2011 - Replace Distributor Cap
- Replace Distributor Rotor
- Trouble adjusting idle down low enough.
-- Remove idle control knob and flush inside with carb cleaner (this should be done when throttle body is cleaned)(also I read, after the fact, that fuel injector cleaner is less likely to damage plastic parts and gaskets in the throttle body than carb cleaner (?) ).
- Set idle (note that there was not a noticeable change in RPM when IAC was grounded but idle is stable.
Emissions Test 15 mph 25 mph
HC CO NO HC CO NO
04/19/2011 10 0.01 39 16 0.01 542
PASS
--
1988 244 DL
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