Quote:
Originally Posted by Exasperant
With luck I'm about to be the owner of a "why did it have to be silver, everything else about it is what I was looking for!" 940 2.0 LPT.
I'm wondering if there are any known tweaks to improve mpg. Not worried about outright performance, I already have a nippy throwable car for those moments.
I spotted some people selling chips claim their maps give "more economy", but I'm wondering how true that is? I'd have thought manufacturers would sacrifice performance for fuel efficiency...
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Quote:
Originally Posted by 360beast
2.0 LPT? do you mean 2.3? They didn't do a 2.0 LPT.
Manufacturers have to map cars for a best of both worlds and make them easy to drive so yes chips can increase performance and economy. They factor in longevity of the parts and not stressing the engines etc.
I and a couple of my mates all think silver is the best colour for the 940.
Edit: now I should actually answer your question, the best thing to do would be to give the car a stage zero. So new plugs gapped to 0.7mm (NGK BPR6ES), new oil and filter (genuine volvo oil filter only), air filter, distributor cap, rotor arm, HT leads (Bougicord only), PCV box cleaned out thoroughly with new O-ring, new belts and front oil seals and a new fuel filter.
There might be more things I've not listed but I can't think of them at the moment.
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In addition to Lukes excellent advice, i would add only run it on 98 octane (95 is likely to cause detonation aka pinking which you won't hear, the knock sensor in the engine will though and retard the timing making it less efficient) which is likely to give you better performance as well.
Also some time before doing the oil/filter change, add 0.5L of Carlube ATF-U to the engine oil. When you do the oil change (leave it a minimum of a few days driving), after the old oil has drained and you've refitted the sump plug and new filter, add 0.5L of ATF-U to the engine then top up with your choice of 10W40 semi-synthetic oil to the right level.
I do this on both my beasts for many reasons, on the non-Volvo in addition to everything it does on my Volvo, it helps keep the hydraulic tappets working as they should. On all engines though it helps free sticky piston rings, valves, revives oil seals (won't cure major leaks but can remove minor ones) and generally cleans the engine gently. There are a couple more things it helps with (such as improving emissions) as well.
Also when you clean the PCV system out, make sure the inlet manifold stub is clean on the inside (carb cleaner) and clean the inside of the throttle body and AICV with carb cleaner too.
On no account EVER touch the throttle stop screw on the throttle butterfly. We've had a few on here lately that have decided to play with this to solve an idle problem and caused themselves even more headaches!
Remove fuse ~1 after doing the service for 30seconds and refit. Also, where does the temperature guage sit after about 5 minutes of normal driving from cold? If it's not halfway, invest in a new thermostat. Also if the mileage is 100k or more and there are no signs the Lambda sensor has ever been changed, consider changing it in the near future. They only have a service life of ~100k miles/10 years anyway and a weak/failing one can cost you precious mpg and maybe an MoT fail.
A dose of injector cleaner when you pick it up will help on the journey home (try and get a sustained high speed drive like a motorway to help get the cat hot and burn off excess carbon on the way) to clean the injectors :
https://www.halfords.com/motoring/en...te-247886.html
Other than that and all the usual stuff such as wheel alignment, tyre pressures, making sure brakes aren't binding etc and you should be fine - i can easily get 32mpg on a decent run out of mine and that's a 2.8 V6 auto!
