blown engine diagnosis

[c_k06]

I am buying a 92 gsx from a friend who thinks he blew the head gasket. He bought a aftermarket 16g turbo new boost guage and boost controler. He installed the boost guage correctly and turbo. He took it to a shop and had them hook up the manual boost control. When they were hooking it up he couldnt quite place it but he thought they installed it wrong. As he test drove it he turned the boost to zero and drove. As he started to leave the pressure shot to 25 psi and something blew. He saw white smoke and didnt no what it was. he was able to drive it home. I need some input...

 

[DSM4me44]

It sounds to me like he blew up the turbo. I wouldn't be surprised if he snapped the wheel off either. If he blew a headgasket, then most likely you would find a leak or either coolant or oil on the ground. If it is an internal blow on the headgasket then you will find that your oil and coolant are mixing, which you can check as well by examining your coolant.

Now the car will probably smoke a little right now from a blown head gasket or blown turbo. I would say from experience that if it is A LOT of white smoke it probably is the head gasket, if it is the turbo then not as much.

Can the car still build boost at all?

Refere to these to figure out whether you have your MBC installed correctly.

http://www.dsmtuners.com/forums/articles-turbo-system-intercooler/237982-best-way-install-mbc.html

http://www.dsmtuners.com/forums/problem-diagnosis/3175-mbc-install-merged-10-7-a.html

 

[dsmtbopwr]

From what I know when I blew my head gasket is to check the oil dip stick and coolent. If the oil looks milky then you have a blown head gasket. And your friend must have turned the bc the wrong way if it hit 25 psi when he supposably turned it to no boost.

I thought a blown turbo was black smoke but I may be wrong. See if it builds boost. Look for leaks also.

 

[viperlp01]

Took it to a shop to install a MBC was his first problem. His second was not taking it slow the first time he boosted... DUH but live and learn... I learned to do stuff like that on your own and read the directions.. The tighter the screw the more boost. More loose equals less boost... I would check the turbo and see if the wheel is still in the housing if it is then check for shaft play.

 

[illinifrever]

Having blown a head gasket on my old Taurus, that doesn't sound like a blown engine. I had oil everywhere and I couldn't get it to go. I'd assume it's a blown turbo. Go back to the shop and see if they'll cover you for it, seeing as they just installed it.

 

[c_k06]

It happened a while back like a year ago. We looked all over the block for cracks and holes. He said a cloud of white smoke came out of the hood and the exhaust. The turbo wasnt blown. he put the aftermarket 16g evo turbo on a little bit before it only has like 500 miles on it. He said that the guy who installed it was calling his buddies and asking them like he didnt no what he was doin. My friend thinks they hoked to mbc up backwards. When he left the shop to test drive he turned to boost down. The shop guy drove not him. he said the shop guy was in first gear and slowly accelerated and then out of nowhere he just reamed it. The boost guage read 7 then 14 then it shot to 25 and and it blew. He said he was able to drive home ok. He parked it there and never moved it again. He started to disassemble it and then he had to stop due to working hours. so im getting ready to take the head off and check the gasket and check for cracks in the block.

 

[dannyd97gst]

Too bad it is partially disassembled, if the headgasket did bust and did produce white smoke from the tail pipe then this means coolant is getting into the cylinders and burning. If the engine was together you could unplug the coil packs and fuel pump relay, remove the radiator cap, clamp the overflow coolant hose shut, and have someone turn the engine over with the key of course, while looking for air bubbles in the coolant. Or just remove the spark plugs and fill the cylinders with air, making sure all valves on that cylinder are closed. Air in the cooling system or air coming from the crankcase means no bueno and time for a rebuild.


Either way you have an excuse to build a dsm

 

[c_k06]

HE is giving me an extra short block with it but the pistons are a little etched on top from the valves hitting them. i looked at the radiator and i think he drained it. he took off the turbo, exhaust manifold, intake housing, fuel rail and injectors, thermostat housing and started on the intake manifold. im going to take the intake manifold off and then pull the head and check the gasket, pistons, block and head thoroughly. He did a comp test on all four cylinders and 1 and 2 were ok but 3 and 4 were at like 0.

but whatever happens im not going to completly build it right now. im going to get it running good and then i will slowly build the short block into a beast.