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Originally Posted by gigy  this question is for mpfi cars only. when we give car for servicing they offer tune up of engine and mostly we welcome it expecting better mileage. what do they actually do? |
I know this is way off topic... but just cant help replying to that..
1]
maybe just wash ur car and hand it back to you..if they think the customer doesnt know much about cars.
2] if the car was knocking and even if u explain to them there is issue with valve lash/setting. they dont understand what the hell you are talking about, or simply say ur fuel was bad.
3] if you ask to get ur oil changed they will top it up way over the max level without flushing the older oil or if u are lucky they will fill new oil and use new filter and again top it up way above max...
4] change some part for 5000 bucks or 300$ etc etc ...
I can go on and on..
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Originally Posted by gigy just clean plugs? |
you wish..they do something
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Originally Posted by gigy adjust something? |
adjust nothing if it doesn't squeak, rattle, clunk or about to fall off or catch fire or something you would like them to adjust specifically
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Originally Posted by gigy remap ecu? |
definately they wont remap your ECU during a regular service unless its a known issue with those models..
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Originally Posted by gigy connect some kind of handheld device and download data from ecu? |
only if the the MIL/CEL is on or there is a problem with the MPFI engine which they cant understand whatthe hell is going on..
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Originally Posted by gigy if so can they not tune up for best performance? |
wish dealers would do that..
If you are really hyper or crazy like all the bhpians out here .. you will do most of the things with a private garage and personally supervise everything or do it yourself.. or even plug a Obd2 software to ur ECU and analyse..
If it's like a timing/valve clearance/ECU thing or something very delicate then only go to the delership and hope he doesnt rip u off...
from my personal experience atleast this is what i have understood..maybe other people have had better experiences at their delarship's service stations..