Tom thanks again for the response.
I understand your point, there is no doubt about human perception being very
imprecise, if we go by just the perception then our cars run better after
washing and waxing alone.
This is how I say the idle roughness increased after camshaft chain tensioner
and intake manifold gasket installation. Before this procedure I would feel a
ripple in drivers seat and steering wheel only when the compressor would cycle
on/off, now I feel this ripple even without compressor on/off, may be every
thirty second or so, but there is no discernable pattern to the frequency of
I realize that if the issue is mechanical, software update is not going to fix
it. I actually inquired of the dealer if he could just tell me what version of
the software is onboard and what is the latest version available from Ford at
this point so I could figure out if there is any update available at all. I was
told the procedure is to hook up the vehicle to WDS, it will interrogate the
onboard system and compare it to the latest version available and if there is an
update it would install it and I would have to pay for the procedure, update or
My thought is that if there is an available update, it means the onboard system
was deficient to begin with thereby requiring the update, so it is the
responsibility of Ford to pay for it. I am UNaware of what industry standard is
about such updates, since I am not in this business nor have I been in a similar
situation before. I am comparing it to Windows, Bill Gates puts out updates all
the time, we do not pay him specifically for that, I know that in case of
Windows Bill Gates does not have to arrange for any labor as for as updating my
particular machine is concerned.
'> Tom thanks for your reply, here is the info:
'> I am reading the RPM from vehicle tachometer, (I said 500 because the dial
'> is barely above the 500 mark and sometimes it is even just at the 500 mark)
'I pretty much thought that you are using the vehicle tach, I have seen up to a
'100 rpm difference from a vehicle tach to a good diagnostic tachometer.
'> reading is from a hot engine in idling state, the RPM stay almost the same in
'> hot idling state regardless of vehicle being in gear or not and/or the Climate
'> control is on or not. The vehicle has about 55K miles on it, maintenance wise
'> is a very well kept vehicle.
'> According to the dealer, there is no detectable abnormality in any test they
'> on it to look for a reason of rough idle. There have been complaints about
'> engine having rough idle and back firing which in many vehicles were fixed by
'> replacement of intake manifold gasket and camshaft chain tensioner, these
'> procedures actually worsened the roughness of idle on my vehicle instead of
'> improving it, the degradation is only mild though.
'You are correct in that this engine has been known to have a somewhat rough
'idle. If the problem is actually worse than the norm, or if it is really worse
'from the repair the technician could have done something wrong. It is also a
'possibility there is nothing wrong but is only a perception you have that there
'is something wrong. By having the "problem" fixed you were expecting that the
'idle quality would improve which it may not have but stayed the same. I'm kind
'of trying to say in a nice way that the problem may not have been a problem and
'nothing was actually fixed. Because something was done to the engine and no
'physical change was made in your mind it is now worse. That is why your vehicles
'idle quality needs to be compared to another vehicle.
'> Do you think 'engine management software' update could be a possible solution,
'If there is actually a problem with the software, yes it is possible. If there
'is a mechanical problem or no real problem, no.
'> the dealer says he is aware of at least one such identical engine that was
'> having low idle RPM and was even stalling and it improved with such procedure
'> since there was a calibration update needed for it.
'> Thanks again,
Remove asterisk to email, add "Re:" (without quotes) to subject line.