dhahlen

iTrader: (5)

My compression test came out 90s on the front rotor and 80's on the rear. What should I expect to see there? Compression is obviously a bit low, I heard it should be anywhere from 80-140. The dood at the shop said he found a vacuum line that was broke, and a switch that was broke also... any clue what these could be? Anyone have any ideas... let me know.. (car is having idle problems, stalls sometimes when A/C is on) and it's not a MAP sensor problem. Any idea on the compression results either?

Mr rx-7 tt

iTrader: (5)

You need to know what EACH of the three readings on each rotor face is, three in the front, three in the back for a total of six.

vosko

iTrader: (4)

does the car idle ?

if it does and has power the engine is fine

dhahlen

iTrader: (5)

Those were just peak readings... =/

jspecracer7

if those were peak readings, then your fine...IF the peak readings are the same for all 3 sides of the rotor.

dhahlen

iTrader: (5)

Yes the car does idle... but rough. Can vacuum switches cause all this crap? Apparantly one of them was busted....

Mr rx-7 tt

iTrader: (5)

Peak readings are the highest number out of one of the three pulses, it tells you nothing.
He needs to take it to someone who has a rotary compression tester and do a real test.

kyle@insight

The busted vacuum lines can cause your car to idle funny, address that problem as it's an easy fix then get a real compression test done.