Jump to content
SAU Community

Recommended Posts

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?

Link to comment
https://www.sau.com.au/forums/topic/206474-only-running-on-5-cyl/
Share on other sites

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
I feel sorry for GTS4WD. All that effort and a mechanic takes over... :ermm:
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

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • just an update to this, poor man pays twice  Tried sanding down the pulleys but it didnt do the trick. Chucked another second hand alternator in the na car which I got for free off my mate and its fixed the squelling. Must have been unlucky with the bearings.    As for my turbo car, I managed to pick up a cwc rb alternator conversion bracket + LS alternator for 250 off marketplace, looked to be in really good nick. Installed it , started the car and its not charging the battery.... ( Im not good with auto elec stuff so im not sure if this was all I needed to do but I verified such by using a multimeter on the battery when the engine was running and I was only getting 12.2v )   I had to modify the earth strap for the new LS alternator , factory earth strap was a 10mm bolt which did not fit the bolt on the LS alternator which was double the size so I cut it off , went to repco bought some ring terminals that fit, crimped it onto the old earth strap and bolted it up to the alternator , started the car and same issue. Ran like shit and was reading 12.2 at the battery.  For a "plug and play" advertised kit thats not very plug and play but alas.  My question is , am I missing something ? Ive been reading that some people recommend upgrading the stock 80 amp alternator fuse to a 140 amp but I dont see how that would stop the alternator charging especially at idle not under load.  Regardless ive pulled it out and am going to get it bench tested by an auto elec tomorrow but it would be handy to know if ive missed something silly or have done something wrong.   
    • My wild guess is that you have popped off an intake pipe....check all of the hoses between the turbo and the throttle for splits or loose clamps.
    • Awesome, thanks for sharing!
    • To provide more specific help, more information is needed. What Android screen? What is its wiring diagram? Does the car's wiring have power at any required BAT and ACC wires, and is the loom's earth good?
    • So, now all you need to do is connect the 2 or 3x 12v feeds into the unit to permanent 12v, ACC 12V and IGN 12V that you can find in the spot behind the stereo, and the earth, and then it will switch on with the car.
×
×
  • Create New...