Vaccum Change

[Wacky Dee]

I had a profec b spec2 EBC installed a couple of months ago and the display would always show "-99" reading when the engine was warmed up and idle.

I was told that this is very good because it shows that the compression is good ie. engine has not been trashed.

Now all of a sudden recently, I have noticed that the ebc's display shows the vaccum around -85 instead (when warm and idle) after a major service during which all belts were changed (excl. timing, which was done earlier) oil, etc

The weird thing is, on some days the ebc displays -99 or so when warm and idle and other days it just won't go below -87

What could this mean? Has there been some damage to the engine??

I'm using thicker oil (10W40) after the last service to stop some valve lifter tapping noises .. car seems responsive and as before but I'm worried something's gone wrong with the engine somewhere.

Also I noticed that if the idle warm vaccum reading is -85 or so, when I press the clutch in it goes down to -90 ..and back to -85 when I let the clutch go.

And another (possibly related) thing ... my belts were squealing badly (too loose) after last service so I took it to a local mechanic who I think may have overtightened them .. could this in any way explain the vaccum thing??

Edited August 22, 2008 by Delta Force

[paulr33]

the difference is tiny, dont even worry

what reading is the value?

if its mmhg it should be around -500mmhg

[Wacky Dee]

the EBC is in PSI mode ... what worries me is why suddenly the ebc displays -85 when the engine is warm and idle when it used to be -99. That's exactly one 6th which makes me think that something might be wrong with one of the cylinders?

[Wacky Dee]

the EBC is in PSI mode ... what worries me is why suddenly the ebc displays -85 when the engine is warm and idle when it used to be -99. That's exactly one 6th which makes me think that something might be wrong with one of the cylinders?