Blown Head Gasket Question

[1gDSM4g63]

Would a blown head gasket or valve seal also cause erratic wideband a/f reading along with no boost and white smoke coming out of the exhaust or is that a separate deal with my fuel system?

 

[assault187]

Thick, sweet smelling white smoke is coolant burning. If you are pushing coolant it will throw you AFR reading off.

Have you done a compression test and a Leakdown test to make sure?

 

[1gDSM4g63]

The compression for all cylinder is 150. How do you do a leak down test?

 

[laserspeeddemon]

Yes, your HG is blown. Everything you described are symptons of a blown HG. When you replace it, go with a Mitsubishi MLS HG and ARP Headstuds and you'll be worry free until the next time you must remove the head.

 

[Big Woo]

Yes, white smoke, = coolant in the exhaust pipe from somewhere.

 

[1gDSM4g63]

Yes, your HG is blown. Everything you described are symptons of a blown HG. When you replace it, go with a Mitsubishi MLS HG and ARP Headstuds and you'll be worry free until the next time you must remove the head.

I already did ARP head studs and 4 layer Ralliart head gasket the first time around. Don't why it blown again.

Another thing, what will the compression test read? All four cylinder going to have low compression? And could it be another problem beside blown head gaskets? I mean this is a fully built motor and I haven't gotten a chance to run it hard.

 

[Big Woo]

Ok, other things could be.
1: cracked cylinder head
2: cracked block
3: cracked turbo center section if your using a water cooled turbo.

No not necessarily, will all of the cylinders measure low on a compression test. It could be just one or two depending on where it failed.

The most likely cause is one of the following, if it turns out to be a head gasket. (this is just from my expierence)
1: cylinder head was not flat prior to installing
2: engine block was not flay prior to installing
3: insufficient or incorrect torque on head blots/studs.
4: cylinder head /block surface finish incorrect for gasket type used
5: Poor tuning causing excessive heat build up, that was unable to be thermally conducted into the one of the engines methods for heat transfer.

 

[laserspeeddemon]

Ok, other things could be.
1: cracked cylinder head
2: cracked block
3: cracked turbo center section if your using a water cooled turbo.

No not necessarily, will all of the cylinders measure low on a compression test. It could be just one or two depending on where it failed.

The most likely cause is one of the following, if it turns out to be a head gasket. (this is just from my expierence)
1: cylinder head was not flat prior to installing
2: engine block was not flay prior to installing
3: insufficient or incorrect torque on head blots/studs.
4: cylinder head /block surface finish incorrect for gasket type used
5: Poor tuning causing excessive heat build up, that was unable to be thermally conducted into the one of the engines methods for heat transfer.

6:HG not seated due to head studs being installed out of sequence (or imporperly torqed head studs)

 

[gsxeclipse97]

My car maintains 20-22 hg and the head gasket leaks oil but not coolant so but will be replaceing as soon as my school money get here. I believe that the shop that did it didn't tq teh head bolts down correctly and that is what caused it to leak oil. But i will keep everyone posted on my progress.. I also have the white smoke from the exaust but its also coming from underneeth the hood.

 

[92awddsm]

6:HG not seated due to head studs being installed out of sequence (or imporperly torqed head studs)

Number three.

3: insufficient or incorrect torque on head blots/studs.