Failed mot on emissions, on advice from SAAb mechanic friend I have changed vaccum tube, oil changed and replaced air/fuel/filters.

Usually changing the spark plugs, air filter and an oil change will fix your problems. If your oil is old, you can get the high carbon. I don't usually change the spark plug wires and I just take the distributor cap off and clean the contacts.

you need to do a major tuneup !!!!!!! replace air & fuel filters, spark plugs & plug wires, distributor cap & rotor, replace OXYGEN SENSOR, change oil & filter, hopefully your catalitic converter is ok, if not , it should be replaced !!!!!!!!!!! together w/tuneup would be the best way to assure passing emissions !!!!!!!!

I would replace CATalitic converter, this car is old, plus a tuneup is 100% necessary , spark plugs wires, ditributor cap & rotor, plus both the air & fuel filters need replaced. change oil & filter. then you will pass emissions test. and your car will run like its suppose too. if you don't do all this , then buy a new car !

hi.
if there are no faults showing, then the most obvious thing to do would be to change the air filter, this is a relatively cheap part, but it can make a huge difference to emissions, even if it looks perfectly clean.
also make sure you take the car on a good run before taking it to the test centre to ensure that the engine and catalytic converter are up to operating temperature.

it is possible that the catalytic converter is clogged up and not working properly. the only cure for this is to replace it. the mot tester can usually tell you if he thinks it is the cat. my mot tester is always good for advice, just ask what he thinks could be causing it if the air filter does not make enough of a difference

First look along air intake tubes, be sure no sensors were unplugged or pulled out of place. Lean codes are usually air mix related. i.e. mass air flow or air temp sensor. also look over all plastic vacuum tubes, be sure none are broken. listen for a hissing sound.

CHANGE THE OIL TO TOP QUALITY OIL THEN CHANGE THE SPARK PLUGS TO BETTER SPARK MOST PROBABLY IRIDIUM THEN CHANGE THE AIR FILTER TO A BMG AIR FILTER (THIS AIR FILTER DOESNT EVER NEED CHANGING) THEN FILL THE PETROL (IF IT NOT DIESEL) WITH HIGH OCTANE (98ron) AND ADD RACING OCTANE BOOST TO THE PETROL TANK AND THAT WILL SOLVE THE PROBLEM AND YOUR CAR WILL GO A HELL OF ALOT BETTER YOULL SAVE ON FUEL ALSO THE IRIDIUM SPARK PLUGS DONT HAVE TO BE CHANGED FOR AT LEAST 100.000KLM HOPFULLY THE PETROL AND MORE AIR GOING IN WILL HELP

It will smoke because of the red x, dontr know how long it will take to clear. But before going for an mot, you should take the car on the motorway or such like and give it a good blast/clean out. Town and short trip driving is not good for the car, it can clogg up the exhaust, and also if you take the car for test and the engine is relatively cold then the emmissions will be bad, As i said, give a good blast down the road to clear it out, That should work.

It is probabley worn rings so the best thing to do is at next oil change get a can of V-8 formula engine restore it takes the place of about half a quart of oil I think to be exact I think the restore for a V-8 is a 15 ounce can.Try that at oil changes.

theres 3 things ur emisans fail on 1 spark plugs 2 air filters need changing 3fuil filter so yes a full service should do it change ur oil fuil filter air filter oil filter and oil

If the car was left outside, it is better if you replace engine oil and fill fuel tank to remove condensed water, then replace fuel filter after about 50 Kms