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Started up my car the other day and it was running really rough........... took it to my wifes uncle who is a mechanic and had a look. said it appears to be running on only 5 cyl............ checked em out and there is definatley a miss in cyl #1.

as we were only at his house couldnt find out for sure what is causing it.........thought i would throw it up here to get peoples opinions on it..

As far as i can tell i have 4 options as to the cause....

spark plug

coil pack

injectors

or the bad one.......a valve..

the car is running just really rough and bad vibration through the whole car..........any ideas?

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https://www.sau.com.au/forums/topic/206474-only-running-on-5-cyl/
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firstly try to eliminate all the easy problems first eg spark plugs and test the coils to see if that fixes it.

if it is that then your lucky, if not then you'll have to go about replacing the more expensive bits.

so try the easy bits first

swap spark plugs with another cylinder.. this will cheak sparkies..

pull the coil out and start it without a spark plug.. if it sparks.. its not the coil packs

injectors.. use a multimeter.. get a workshop manual.. and cheak the voltage/amprage

cross all these off.. and then double cheak them.. then find 3 other ways to cheak each part.. then find other things that can cause it.. and as a VERY last thing assume a valve.. because valves dont just shit themselfs for no reason.. broken valves are caused from wrong calculations when shaveing blocks/heads.. or extended periods of very very poor timing settings..

see what can cause damage valves and then diagnose those and see if it realy does lead to broken valves..

An easy way is to go down to repco or supercheap and get a compression tester.. it fits where your spark plug goes.. you disconnect the battery and then crank the engine.. and it will regester the max PSI on a guage.. this can determin if there is a leak within the chamber. Do this to all 6 cyl's

BOM!.. gosh im good! :whistling:

lol... Im really proud of that!

and sorry to complicate things.. but gaskets can also cause a los of preassure that can manifest or appear as though a cylinder has dropped..

keep us updated so we can help

Edited by GTS4WD
  R338OY said:
I feel sorry for GTS4WD. All that effort and a mechanic takes over... :ermm:
  Eug said:
agreed. there wasn't any real point in asking the forum in the end, ask the mechanic next time :D

So your saying I dont do as good of a job as a mechanic!?! :P

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