Huge power loss! - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

LeeS13 · 08-18-2009, 03:17 PM

hello to all ,
i have an sr20det red top, with a built head and stock bottom end bigger turbo, injectors , pfc. the works.. the car ran great till my stem seals were going bad.. lots of blue smoke on Decel so i changed the stem seals ran great no smoke... Now im getting blue smoke on Accel "Tons of it". well the other day i was driving to work and my car started to feel hesitant then i lost power .. i went form driving 55mph to not being able to go over 25mph.. the car sounded like a SUBARU.. i pulled off the road and it died... i tried to start it back up and it started and i was able to drive half way back home, it drive pretty normal and then about 1/3 mile latter the power loss and subaru sound came back.. lucy me i was in a 20mph zone and i putted back to my garage, when i got home i did a comp test and cyl#1 was 135, cyl #2 was 130, cyl #3 135, cyl#135 . cyl #3 and #4 spark plugs were coated in oil
i changed the spark well gaskets, valve cover gaskets, valve stem seals, head gasket.
any advise will be appreciated. thank you in advance

VOoDOoGTX · 08-18-2009, 03:19 PM

turbos blown. is it boosting?

LeeS13 · 08-18-2009, 03:58 PM

my turbo is new gt30 BB. smoking at idle i know is caused by a blow turbo but im having blue smoke on acceleration.. on the dyno i was able to hold 21psi no problem. but now im just confused because im getting the same symptoms as bad valve stem seals but i just replaces the stem seals and instead of smoke on decel its on going with accel. so im thinking its my rings .. but i would like someones professional opinion on what the problem might be ..

*fliprayzin240sx* · 08-18-2009, 05:11 PM

130-135 psi is pretty low but still within the tolerance per FSM. My guess is since you're getting oil into the chamber, its killing your spark, hence making it sound like a subaru since your not firing in 1 or 2 cylinders. Clean up your spark plugs and start it again, I bet itll run okay again. The problem is you're still getting oil into the chamber. Its either coming up from piston rings or its coming from the head. Pour a cap full of oil into the cylinders and see how high the compression jumps up. If it jumps up alot, then your rings are done.

LeeS13 · 08-18-2009, 05:30 PM

i did a comp test with a cap of oil and the readings were #1cyl 150, #2 150, #3 153, #4 155... bad rings i take it ?

Quote:

Originally Posted by fliprayzin240sx

130-135 psi is pretty low but still within the tolerance per FSM. My guess is since you're getting oil into the chamber, its killing your spark, hence making it sound like a subaru since your not firing in 1 or 2 cylinders. Clean up your spark plugs and start it again, I bet itll run okay again. The problem is you're still getting oil into the chamber. Its either coming up from piston rings or its coming from the head. Pour a cap full of oil into the cylinders and see how high the compression jumps up. If it jumps up alot, then your rings are done.

VOoDOoGTX · 08-18-2009, 07:22 PM

i think you fried your turbo after buring up all your oil with the leaking valve stems. pull the inlet and spin it.

Odysseus · 08-18-2009, 08:13 PM

Quote:

Originally Posted by VOoDOoGTX

i think you fried your turbo after buring up all your oil with the leaking valve stems. pull the inlet and spin it.

Did you not read the thread? It says not smoking at idle like a turbo that is blown would do. The turbo is obviously perfectly fine. How do you expect him to lose enough oil with leaking valve stem seals to cause the turbo to not get the oil it needs? Oil in the combustion chamber is caused by two things: Worn valve stem seals or worn oil rings. If he has replaced the valve stem seals then what else could it be?

If you have no idea what your saying then just dont bother dude...He said he wants professional advice.

LeeS13 · 08-18-2009, 08:32 PM

yah my turbo dosent have anything to do whit my problem ..

stealthsr20 · 08-18-2009, 08:44 PM

If it were me i would perform a leakdown test and see what happens. just
my

VOoDOoGTX · 08-18-2009, 10:58 PM

he said in his original post that he drove the car untill it died. EVEN after he noticed it blowing white smoke. what does that tell you.

turbos can blow in different types of ways. if the turbo bearings/seals are going he will only get smoke when the car spools up(moving) and squirting the oil out.

He should do a leakdown test like the other guy said but if it passes that then its the turbo.

LeeS13 · 08-19-2009, 01:34 AM

hours of working ... and i knew it bottom end .. but in a weird way im happy.. i told my wife " who supports my habbit" and the first thing that came out of her mouth was .. u should order the shiny pistons ! lol .. so forged bottom end it is for me ..
thank you all for taking the time to reply, every opinion and suggestion made narrowing down and diagnosing the problem a lot easier. thanks again
lee

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08-18-2009, 03:17 PM	#1
LeeS13 Join Date: Jul 2009 Location: NW Age: 24 Posts: 18 Trader Rating: (0)	Huge power loss! hello to all , i have an sr20det red top, with a built head and stock bottom end bigger turbo, injectors , pfc. the works.. the car ran great till my stem seals were going bad.. lots of blue smoke on Decel so i changed the stem seals ran great no smoke... Now im getting blue smoke on Accel "Tons of it". well the other day i was driving to work and my car started to feel hesitant then i lost power .. i went form driving 55mph to not being able to go over 25mph.. the car sounded like a SUBARU.. i pulled off the road and it died... i tried to start it back up and it started and i was able to drive half way back home, it drive pretty normal and then about 1/3 mile latter the power loss and subaru sound came back.. lucy me i was in a 20mph zone and i putted back to my garage, when i got home i did a comp test and cyl#1 was 135, cyl #2 was 130, cyl #3 135, cyl#135 . cyl #3 and #4 spark plugs were coated in oil i changed the spark well gaskets, valve cover gaskets, valve stem seals, head gasket. any advise will be appreciated. thank you in advance

08-18-2009, 03:19 PM	#2
VOoDOoGTX Join Date: Jul 2009 Location: New Paltz, NY Age: 21 Posts: 25 Trader Rating: (0)	turbos blown. is it boosting?

08-18-2009, 03:58 PM	#3
LeeS13 Join Date: Jul 2009 Location: NW Age: 24 Posts: 18 Trader Rating: (0)	power loss my turbo is new gt30 BB. smoking at idle i know is caused by a blow turbo but im having blue smoke on acceleration.. on the dyno i was able to hold 21psi no problem. but now im just confused because im getting the same symptoms as bad valve stem seals but i just replaces the stem seals and instead of smoke on decel its on going with accel. so im thinking its my rings .. but i would like someones professional opinion on what the problem might be ..

08-18-2009, 05:11 PM	#4
fliprayzin240sx SLINKY + ESCULATOR = Fun Times Join Date: Aug 2002 Location: Ass Crack of Japan Posts: 8,413 Trader Rating: (5) Rides Gallery: fliprayzin240sx	130-135 psi is pretty low but still within the tolerance per FSM. My guess is since you're getting oil into the chamber, its killing your spark, hence making it sound like a subaru since your not firing in 1 or 2 cylinders. Clean up your spark plugs and start it again, I bet itll run okay again. The problem is you're still getting oil into the chamber. Its either coming up from piston rings or its coming from the head. Pour a cap full of oil into the cylinders and see how high the compression jumps up. If it jumps up alot, then your rings are done. __________________

08-18-2009, 07:22 PM	#6
VOoDOoGTX Join Date: Jul 2009 Location: New Paltz, NY Age: 21 Posts: 25 Trader Rating: (0)	i think you fried your turbo after buring up all your oil with the leaking valve stems. pull the inlet and spin it.

08-18-2009, 08:32 PM	#8
LeeS13 Join Date: Jul 2009 Location: NW Age: 24 Posts: 18 Trader Rating: (0)	yah my turbo dosent have anything to do whit my problem ..

08-18-2009, 08:44 PM	#9
stealthsr20 Leaky Injector Join Date: Nov 2008 Location: oklahoma Age: 25 Posts: 138 Trader Rating: (2)	If it were me i would perform a leakdown test and see what happens. just my

08-18-2009, 10:58 PM	#10
VOoDOoGTX Join Date: Jul 2009 Location: New Paltz, NY Age: 21 Posts: 25 Trader Rating: (0)	he said in his original post that he drove the car untill it died. EVEN after he noticed it blowing white smoke. what does that tell you. turbos can blow in different types of ways. if the turbo bearings/seals are going he will only get smoke when the car spools up(moving) and squirting the oil out. He should do a leakdown test like the other guy said but if it passes that then its the turbo.

08-19-2009, 01:34 AM	#11
LeeS13 Join Date: Jul 2009 Location: NW Age: 24 Posts: 18 Trader Rating: (0)	hours of working ... and i knew it bottom end .. but in a weird way im happy.. i told my wife " who supports my habbit" and the first thing that came out of her mouth was .. u should order the shiny pistons ! lol .. so forged bottom end it is for me .. thank you all for taking the time to reply, every opinion and suggestion made narrowing down and diagnosing the problem a lot easier. thanks again lee

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