please tell me im wrong

[romeo]

So sounds like the gsr is leaking air, and found some oil near where one of the oil galleries are and car runs rough on idle when it says on, did a compression test and cylinders 1-3 are all 180psi but cylinder 4 is only at 157-160psi. My brother said sounds like head gasket is gone please tell me its just something simple that doesn't involve all the work that needs to be done with changing the gasket.

 

[4piknup]

Its only just 10% down so not really bad.
Could put a lttle oil on the walls of that cylinder, retest and see how much it comes up.
Then do a leakdown test to see where the leakage is going.

Maybe a leaky valve. Thats more work than a hg

 

[MDK87]

If you suspect a combustion leak into the crankcase, probably the easiest thing to check would be high crankcase pressure at the dipstick tube.

 

[Dave_GSR1.8]

Oil milky ?
Bubbles in coolant when idling engine (start car with radiator cap off and watch as heats up, will loose some coolant but watch for bubbles) ?
Loosing coolant ?
What does no 3 spark plug look like ?
As a desperation measure try here (or equivalent)
"http://liquidintelligence.com.au/products/blown-head-gasket-repair"
Dunno if it will work but worth a try if you are convinced it is head gasket and you really really can't get it fixed for a while.... no 3 is not down that much, a bit, bit not catastrophic so this sort of stuff could help for a while (just don't go to the drags...)

 

[romeo]

ill try putting oil in and seeing if that helps, but still cant figure out where the air is leaking

 

[4piknup]

Gotta get it on the walls. Use a syringe and/or bit of tube.

 

[Rockabilly]

Slight blow bye on #4. Is the engine puffing more air out the oil filler cap than it used to ? I hope for you that I'm wrong..
Cheers

 

[khubner1]

Clean the leak off and check that it's not leaking from the oil pressure sender. The main oil feed for the head is directly behind it. Next up rig a smoke device pull a vac hose (I used the booster breather and some fresh tube) and introduce smoke into the intake any vac/boot leaks should become apparent. For better results seal the TB intake (where the intercooler piping enters)

Then as jack said wet compression test (an increase by doing this indicates worn rings/piston etc.) if it stays the same it's leak down time. Done by feeding 10psi and listening to various areas (intake = bad intake valve exhaust = bad exhaust valve oil cap = ring/piston) good luck

 

[romeo]

thanks guys ill give that stuff a go later on and hopefully its a nice easy fix.

 

[MDK87]

Next up rig a smoke device pull a vac hose (I used the booster breather and some fresh tube) and introduce smoke into the intake any vac/boot leaks should become apparent.

What did you use to generate the smoke?

 

[4piknup]

I say 100 psi. At tdc compression stroke. If u are dead on moter will not spin. Or try 5th gear handbrake on

 

[4piknup]

What did you use to generate the smoke?

Glass bbq.

I use bubbly watrr and spray bottle

 

[khubner1]

I used one of those cancer sticks suck into mouth blow into tube where you see smoke is the leak. I ha a hiss at idle found tht the throttle body shaft seals were kaput.

 

[4piknup]

I got some spare. I think its in a for sale thread

 

[VIN18M]

Is the oil leak on the gearbox side? If so check the o ring on the CAS, I had oil leaking down onto my gearbox, turned out to be that o ring, replaced it a couple of days ago and fixed the problem.

 

[romeo]

I cleaned up the oil and had the car on for abit and so far no leak, but for some reason as soon as I plug the afm in the car turns off? I found the air leak was coming from the exhaust manifold and went to tighten a bolt and the stud snapped so need to fix that.