Help! R34 Has Rough Idle And White Smoke.

[Hanzie]

I got an 98 R34 rb25de NA and its had a Sputtering problem for a while, ive replaced the fuel filter, air filter, spark plugs, AFM.
I went out today and went to check the coilpacks resistance which was :
1 .796 1.6

2 .765 1.5

3 .781 1.4

4 .846 1.7

5 .739 1.4

6 .757 1.4

i also replaced a snapped off bolt that held coilpack 4 inplace, and when i pulled out the spark plug a small amount of coolant came with it, not sure if it was in the hole or ontop of the plug as a fair amount of coolant poured over the engine once i removed a hose, half a cup, probably less, i put a rag down the hole to remove any coolant left there but the rag came out completely dry! The spark plugs were also fouled, all of them, so i put in new ones, once i put it all back together and started the car, it has the slightest amount of white smoke coming out the exhaust, doesnt smell sweet either. I know that if the coolant was from the spark plug hole is a sign of a blown head gasket and so is white smoke, but i dont think it is one as i dont have milky oil or any discoloration, no oil in radiator and no overheating, and ive barely driven it in the past 3 months, I think that the coilpack 4 is shot and needs replacing, so my question is, is that what could be causing the problem? or is that reading ok? could it also be a blasted injector?? bad intake manifold gasket? as i noticed it was in average condition, not broken or cracked but not straight. any suggestions would be helpful!!!

[jay-rod]

You head gasket is gone.

Just because there is no water in the oil doesnt mean its not head gasket.

The gasket can be cracked from the water valley to the piston ring.

Though i could be wrong

Edited March 13, 2014 by jay-rod

[Hanzie]

I was afraid of that lol but was sceptical as it has been an intermittent problem, I don't drive it atm and all started once it was in the shed for 3 months while I was on compo, hence why I didn't think it was the HG, and it didnt have any other symptoms of it but looks like I'm up for a few grand for repairs, any home tests I can to to be sure it's the HG? other then a compression test of course

[Hanzie]

And as it's completely stock car, is there any downfall to using the head gasket repair sealants? Heard they can dry out other rubbers and cause them to crack, any truth to this? And is it a decent fix for temp use? I'm not a fan of them but if they work it'll give me more time to get the cash for the proper job

[jay-rod]

I wouldnt put any chemiweld in a engine you want to keep.

It can clog up everything.

Leak down test, compression test.

Take it to a mechanic and see what they say, most have a tester for seeing how much oxygen is in the radiator.

[scotty nm35]

Sometimes you can even smell raw fuel in the coolant, that will tell you combustion pressure is pushing into the coolant. Very common these days with floating bore engines like the VQ.

As Jared said, Chemiweld is for emergencies only, it won't repair a blown head gasket and is impossible to remove by flushing. It will just block your radiator and water galleries.

A simple carbon test will most likely answer your questions.

[Hanzie]

Just went and started the car and there was no white smoke, and it ran fine for a min till the revs dropped down from initial startup then started sputtering, if it was the head gasket wouldnt it do it all the time?