First time on the spray and Major Problems
First time on the spray and Major Problems I'm having major problems with my car. I had to have the transmission replaced so I have not driven the car in six weeks. The day I got the car back I took it for drive, when I sprayed it the freeze plug on the back of the passenger side head blew out. When the plug blew I had all kinds of throttle body performance codes flashing. I shut the car down right way, it did not get over 210 degrees. When the plug blew the pcm threw another code po522 which is a low voltage oil sensor code. I cleared the codes and the po522 code returned. The car will not start and when it does it revs sky high and I have the shut in down. Does anybody have any ides as to what is wrong. I'm really starting to get frustrated!
By the the way the car is a 02 Z06 with a new 348 built and installed by a well known tuner. I was sparying a NX 150 shot when all this happened!
By the the way the car is a 02 Z06 with a new 348 built and installed by a well known tuner. I was sparying a NX 150 shot when all this happened!
It almost sounds like you had a backfire from nitrous that popped the sensor out of the back of the intake and your sucking a bunch of air through that. Fix that then when the car can be started see what the oil pressure is at.
Launching!
Joined: Sep 2002
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From: monroe,la
It sounds like you had a nitrous backfire and blew out the plug in the back on the intake which would cause it to rev high.When it did that it hit the oil sending unit which is right behind the plug in the intake and that might be your problem.
You guys are exactly right. I just got a chance to look things over, and the entire back of the intake is completly blown apart. Could pulling to much timing cause a nitrous backfire?
Last edited by Z06kern; May 8, 2004 at 10:40 PM.
On The Tree
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Originally Posted by Z06kern
You guys are exactly right. I just got a chance to look things over, and the entire back of the intake is completly blown apart. Could pulling to much timing cause a nitrous backfire?
Imagine this scenario:
1. You spray a wet shot, but at too low of an rpm (say 2500 for a 150 shot), and some fuel puddles into the intake thanks to insufficient vacuum from the motor at this RPM.
2. Your mixture is now lean, and enters the cylinder. Combustion occurs, but is hotter then normal due to lean condition.
3. Due to extra exhaust volume, not all exhaust is pushed out of the valve before the intake valve opens - hot exhaust gas heats up the air in the intake manifold.
4. vapor in the manifold from the puddled fuel ignites thanks to the hot air - nitrous backfire.
So, when spraying a big wet shot, you gotta hit it at a higher RPM - ESPECIALLY if you have a larger cam with an earlier Intake Valve Opening point (which promotes reversion at lower RPM).
Fear of a nitrous backfire is one reason why I run 2 stages - dont need such a big first shot.
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Your explaination was great, but I am still trying to figure out why this would happen. I have a window switch set at 3600 on and 6400 off. When the backfire occured I was about 6000 RPM. The car is equipped with a wot switch also. I had the motor and nitrous system installed all at the same time, as a result they could not tune the car on the nitrous because the motor was new. So as a precaution I had I few degrees of timing taken out just to be on the safe side. I thought I had all the bases covered with making this a safe system until I could take it back and get it tuned. I was wrong!
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Originally Posted by Z06kern
Your explaination was great, but I am still trying to figure out why this would happen. I have a window switch set at 3600 on and 6400 off. When the backfire occured I was about 6000 RPM. The car is equipped with a wot switch also. I had the motor and nitrous system installed all at the same time, as a result they could not tune the car on the nitrous because the motor was new. So as a precaution I had I few degrees of timing taken out just to be on the safe side. I thought I had all the bases covered with making this a safe system until I could take it back and get it tuned. I was wrong!
Originally Posted by Draco
Did you upgrade your fuel pump? I can see the pressure dropping on a 150 shot at 6400 rpm. This could cause the system to go lean and backfire with the rest of the lean mixture still in the intake (even with no fuel puddled, yuou could still ignite the air fuel mix).
On The Tree
Joined: Aug 2003
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Originally Posted by Z06kern
Yes, I have an upgraded in-tank pump and #42 injectors. Is it possible that I did not purge the line good enough and sprayed air into the intake with fuel causing the fuel to puddle in the intake. When the nitrous entered the intake with a excess amount of fuel that caused the backfire.
. There are plenty of *possible* things that could have happened... it could have been that your nitrous noid stuck open a bit longer then the fuel noid at 6400 - so many possibilities. Thats one thing that scares me abot spraying - too many points of failure which can result in major problems. 
that is exactly where my intake broke right on the back... mine was a rev limiter hit though had a nitrous backfire... mine bowed the hood... and blew it back over onto the windshield at about 80mph on the track... not fun. the violence of it makes me believe it was a lean nitrous backfire condition...
too much bottle pressure... ?
too much bottle pressure... ?
On The Tree
Joined: Dec 2002
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From: Flower Mound, TX
If you blew the freeze plug on the back of the head, then you probably also blew a head gasket. Cylinder pressure entering the cooling system that's only designed to handle ~22psi of pressure on the high side = popped freeze plugs.
Originally Posted by mbaskett
If you blew the freeze plug on the back of the head, then you probably also blew a head gasket. Cylinder pressure entering the cooling system that's only designed to handle ~22psi of pressure on the high side = popped freeze plugs.
Originally Posted by mbaskett
If you blew the freeze plug on the back of the head, then you probably also blew a head gasket. Cylinder pressure entering the cooling system that's only designed to handle ~22psi of pressure on the high side = popped freeze plugs.
Originally Posted by Z284U2TRY
I would be going back tot he builder and be like ahh dude your head gaskets you used are ****.
I think before I use the spray again, I will be visting a dyno!
Originally Posted by marlowchris
So were you able to determine what caused the blown head gasket/ nitrous backfire? Stuck solenoid, etc.
