compression testing

[picklesayrshire]

Had a lil search and couldnt find much on compression testing, any1 know of any guides, would incorrect compressions cause the car not to start at times, whats the symptoms of bad compressions.

[Colin]

Well if there ent any compression, no fuel / air is getting compressed so it will struggle to start. Low compression causes problems and could be knackered piston rings, bent valves etc.

[picklesayrshire]

my car starts most of the time, just ruling out all possibilities, still thinkin its the immobiliser .

[Sparco_Tom]

remove spark plug,
attach compression tester
turn engine over
make a note of the reading,
replace spark plug continue on other cylinders

[picklesayrshire]

couldnt ask for anythin better than that tom cheers.

[Sparco_Tom]

no worries, also my engine read 12bar on all cylinders when in good health :y:

[picklesayrshire]

u know anythin bout immobilisers tom, ive read all about unlocking them etc but i cant find the little black transponder box, i seen it in my old VTR but my VTS has a keypad immobiliser, is it integral to the keypad do u know

[Sparco_Tom]

its just the keypad you need to remove iirc just double check for the transponder box

[picklesayrshire]

kl kl and this will bypass the immobiliser am i correct,

[blackie_2k5]

dont know much on the vts immob, is your car intermittantly starting? is their not an immob light on the instument panel as in the vtr? orange light with a key?

[picklesayrshire]

dont know much on the vts immob, is your car intermittantly starting? is their not an immob light on the instument panel as in the vtr? orange light with a key?

yeah sometimes it has trouble starting, the immobiliser light doesnt cum on tho, if there is 1 anyway, need to find out.

[blackie_2k5]

id imagine there will be? your car not have any other probs> missfire spluttering? etc

[picklesayrshire]

id imagine there will be? your car not have any other probs> missfire spluttering? etc

nope, had the clutch changed and had all sorts of problems, cleaned the crankshaft sensor and it sorted the cutting out, hesitation, thinking of changin it anyway, car runs fine when its goin, its just that it wont start at times.