Not to be difficult but exactly how is it going to do that?Not exactly true, the PCM can monitor the power balance of each cylinder, it won't give an exact compression ratio but it can tell the computer if one cylinder doesn't have the same pressure as the other 3.
I don't know. I think the dealership has some culpability in this issue. True she should've been checking BUT, she did do due diligence by asking Ford to change oil. Their refusal gave her a sense of false security or confidence. I mean, if the dealer says don't bother then they are the experts and they should know! Had they changed oil when requested then the chance of finding a potential problem would've manifested itself to a greater degree. But the fact that they refused, tells me they are responsible at least in part.I'm not saying they are responsible by any means my wife ruined that car in 2 months by not maintaning it properly, I still don't think it should have used 4 qts of oil in a 4 mnth 7500 mile stretch tho. (I even wrote reminders in the letters I sent her while I was gone)
Go out into the dealer shop where you work and ask one of the guys to show you a power balance test, I have done them in the past when I worked for Ford, with the car running the Ford scanner(been so long I forgot what it is called) can show you the balance of each cylinder compared to the others. I don't know how it does it but it does.Not to be difficult but exactly how is it going to do that?
It can track fuel and spark but how is it going to track anything else?
I've never seen/heard anything about the PCM having the ability to measure the performance of one cylinder against another on any Ford.
You have two cam sensors, one crank sensor a knock sensor, coolant temp sensors but none of those can monitor a single cylinder.
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Found a description of the procedure, it doesn't appear that it can actually determine the cause of the power imbalance though. It just shows that there is an imbalance.Go out into the dealer shop where you work and ask one of the guys to show you a power balance test, I have done them in the past when I worked for Ford, with the car running the Ford scanner(been so long I forgot what it is called) can show you the balance of each cylinder compared to the others. I don't know how it does it but it does.
Actually some cars can sense a problem with compression. Misfires are read by measuring acceleration, or lack of acceleration due to a misfire. Low compression in one cylinder all the time can be picked up. Also excessive clearance on a worn out big end rod bearing will be read as a misfire. Not making this up my Sub. Forester did the worn rod/misfire.The car has no way to measure compression. It can sense misfires and knock but not compression.
Also ALL engines use some oil or they would wear out rapidly. When a piston is up the cylinder wall is splashed with oil. When the cylinder moves down the oil control rings remove most of the oil leaving just enough to not wear out the piston and all of the rings.Actually some cars can sense a problem with compression. Misfires are read by measuring acceleration, or lack of acceleration due to a misfire. Low compression in one cylinder all the time can be picked up. Also excessive clearance on a worn out big end rod bearing will be read as a misfire. Not making this up my Sub. Forester did the worn rod/misfire.
