Compression Test

[reuben205 0]

Can someone clarify what im doing is guna be right.

Remove all spark plugs,

connect compression tester

With full throttle crank engine over for 5-10 secs

Take reading on that cylinder

 

If low add tea sppon of oil down spark plug and redo test

 

Do i have to disable ignition circuit,if so how?How about injection system. Sorry did a search and couldnt find it.

Thanks

[reuben205 0]

anybody the car is warming up right now!

[MrG 3]

I think thats the way.

 

this is off another forum but I expect its basically the same?

 

Note. To carry out a proper test you will need to take three or four pressure readings for each cylinder. Working on a warm engine with a fully charged battery, disable the fuel system, isolate the ignition circuit and remove the spark plugs. Screw the compression tester into the No1 cylinder spark plug hole, spin the engine on full throttle, note and record the pressures. Repeat the test on the remaining cylinders, noting and recording the pressures. Examine the results, wet test if required. Re-fit the spark plugs; connect the HT & LT leads, re-fit fuel pump fuse.

 

from this site found by browsing

 

and this site is the same! same thing different site

 

So if you take out the plugs, does that constitute disabling of the ignition circuit?

Edited July 7, 2008 by MrG

[gti-si 0]

Just unplug the coil and injectors to cut off the ignition/fuel supply

 

So if you take out the plugs, does that constitute disabling of the ignition circuit?

 

Don't think so, the HT leads will still be sparking away and the injectors will still be fueling

Edited July 7, 2008 by gti-si

[MrG 3]

It didn't sound right whilst I was typing! So how's it going Ruebs?

[reuben205 0]

Got

190

195

200

and 50 but the battery went flat on that one, think i was cranking it for two long on the others and the car had been standing for quite a while

Will charge it tonight and retest that cylinder tomoz

Edited July 7, 2008 by reuben205