So I have been trying to troubleshoot my misfire that I have been having lately which starts above 1bar boost. I have not been able to find the source yet but I noticed something strange. The past few weeks I have been eating up my radiator fluid a little bit (had to refill the fluid reservoir twice in four weeks). I also noticed that I am getting the white smoke at start up and it goes away after about a minute. Post start-up idle is getting rough.

I did a compression test and the results are fine... 190-190-180-190. I am wondering if I have a slight head gasket leak which only impacts the care after startup and at high boost. The high boost may be just enough compression to lift the head slightly and get water past the gasket.

What do you think?

 

Did you do a leak down check?

Based on compression numbers, I would say you've got a issue with number 3.

I experienced a situation where the compression numbers where the same on every cylinder except number 3. It turned out I had a cracked ringland. In this case, I don't think its the ringland. But I get worried when compression deviates more than 2 or 3 pts.

 

No leak down numbers yet. Will try that next. If it shows leakage, a blow headgasket will show bubles in the radiator or overflow tank right? Ringlands would be sound in gas cap or dip stick tube?

 

sounds like i got the same problem, but i had tons of blow by

 

One thing I noticed is that I don't get the white/water smoke on cold-start ups. Only after the engine has been fully warmed up then has been shut down for a little while do I get the water mixing in the cylindars. Maybe this is from the build up of water pressure in the cooling system when warmed up and a slow leak into the cylindars filling them up with a little water after it is shut down?

 

It sounds like you are burning coolant. Do you have any overheating issues? Try pressurizing the radiator to see if any coolant leaks in the combustion chamber.

Snap-on sells a good tool to diag a blown head gasket- it is a combustion leak tester that tests for exhaust gasses in your coolant- it looks like a turkey baster- you suck up some of the steam coming out of the radiator with the cap off while revving the motor. If the tester fluid changes color, you have a blown head gasket.

 

No overheating issues, just spent 10 mins waiting in line at Taco Bell in balmy Florida.

Thanks for the tip on the snap on tool. I did not know there was such a thing.
Thanks.

 

I have heard of such a tool, but only have seen it by Mac.


Do a leakdown and check your sparkplug gap

this is what I do for HG


Go for a drive, get up to operating temperature. Pull over on the side of the road somewhere, pull all plugs leave them in order( or attached to spark plug wires in order) AND LET SPARK PLUGS COOL then taste the end of the plug, if it tastes sweet then it is a blown HG


that is all

 

i had the exact same problem at the exact same boost level, reduced my spark plug gap from .028 to .024 and went to a heat range 8 (previously 7), problem solved

 

I tried gapping my plugs down to .020 and I am using heat range 8, no help. I put them back up to .025 for now.

 

i dont know guys i dont have any coolant, but i still think i have some bad turbo seals ? oil in the intake for the turbo and blows white smoke,some oil residue in the bov? hope its not the piston rings ... please tell me no

 

whats your final * of timing at 14 psi?