Through reading the threads it apears I have det troubles, I let the car warm up for around five mins or so before cuming on boost, it will run full boost for around 20min caining it, then drop to around 6-7psi

 

I have no diagnostic gear to test with, any ideas what to check for or if any 1 in the south east would mind lending a hand :cry:

 

The engine has only been fitted around 7months its had a new det sencor fitted, but not 02 sencors. I have just disconected the battery going to try that! it also has a bad tappet was woundering if this may trigger it???????

Have you got any codes for the ecu?

Think det sensor is code 34?

Wouldn't have thought a tappet would

cause it. :confused:

Are you sure its not comming on safety boost for some reason?

 

You would probably hear / feel the detting.

I've found a break in 1 of the det sensor wires, I've resoldered it disconected the battery for an hour or so an still the same :confused:

I've got a spare ecu that im goin to try 2day

I let the car warm up for around five mins or so before cuming on boost

 

I really miss the power of my Z but I never loved boost quite THAT much.

 

Dave

I've found a break in 1 of the det sensor wires, I've resoldered it disconected the battery for an hour or so an still the same :confused:

I've got a spare ecu that im goin to try 2day

 

Something is not right here. If you had a broken wire you would have had a code 34. A code 34 puts your car into safety boost. There is no way it would have full boost at anytime hot or cold.

Still sounds like its comming onto safety boost, if you were detting I wouldnt imagine your boost would drop that significant and hold exactly at 6-7 psi, that is (someone correct me if im wrong) about the level of safety boost.

 

Try checking other connectors / sensors.

 

Also run the diagnostic check to see what it throws you.

I've put me origional ecu back in drive fine full boost of 9psi for around 20 mins then drops to 6psi again and stays there, if i turn it off and leave it for a while it will resume back to 9psi again?????? I have no diagnostic gear to check it with, I have a feeling one of the 02 sensors may be broke could this give me troubles

Thanks for your help

Hmmm, not sure run the manual diag check;

 

http://www.ttzd.com/tech/diagnostic/diagnostic.html

 

U dont need the conzult for that, have a gander, might solve your prob, well show you what is the prob.

 

I doubt you are pinking unless you are running seriously rich.

I doubt you are pinking unless you are running seriously rich.

 

Lean?

Yeh I was a bit pissed when i posted that, (i meant pinging not pinking, as that sounds like something a trannie would do on a weekend lol) any ways JD; lean carburetion can lead to detonation. Uneven combustion in over-lean air/fuel mixtures can escalate pressures and bring about sudden explosive burning. Also, lean mixtures elevate chamber temperatures which, as you now know, can lead to dreaded detonation.

 

Flame front travel for detonation is closer to 19,000 to 25,000 feet per second; the same rate as in dynamite. The difference between normal combustion and detonation is the rate at which the burning takes place and therefore the rate of pressure rise in the chamber. The hammer like blows of detonation literally ring the metal structures of the motor and that is what you hear as pinging.

 

Detonation occurs when the air/fuel mixture ignites before it should. Normal burning has the flame front traveling from the spark plug(s) across the chamber in a predictable way. Peak chamber pressure occurs at about 12 degrees after top dead center and the piston gets pushed down the bore.

 

Sometimes and for various reasons a second flame front starts across the chamber from the original source of ignition. The chamber pressure then rises too rapidly for piston movement to relieve it. The pressure and temperature become so great that all the mixture in the chamber explodes. If the force of that explosion is great enough --- the engine breaks.

 

Pinging indicates trouble. Trouble that does damage. That damage can be quick and catastrophic but usually isn't. Most often, detonation occurances are small in energy and the engine is able to absorb the punishment, at least temporarily. However, over time, even light detonation does harm; weakening pistons and overheating the top piston rings.

 

Severe detonation can destroy an engine literally in a heart beat.

 

Listen out for pinging, if you have an emanuel, put it in say fourth at a low speed and put foot to the floor, the car will accelerate slower and be under a heavier load, should result in pinging if its apparant in your engine / going to happen it will happen then.

 

If you are pinging I would check your O2 sensors, not sure about the Z but on most cars this will obviously give an incorrect reading if faulty / not grounded right, will short and make an uneven mixture resulting in the pinging.

 

I still think it sounds like safety boost but, im not that techy, so seek dome propper advice, just giving my opinion.

 

(i'll prolly get my balls busted by duff or someone now!)

 

Steve

Yeh I was a bit pissed when i posted that, (i meant pinging not pinking, as that sounds like something a trannie would do on a weekend lol) any ways JD; lean carburetion can lead to detonation. Uneven combustion in over-lean air/fuel mixtures can escalate pressures and bring about sudden explosive burning. Also, lean mixtures elevate chamber temperatures which, as you now know, can lead to dreaded detonation.

 

Flame front travel for detonation is closer to 19,000 to 25,000 feet per second; the same rate as in dynamite. The difference between normal combustion and detonation is the rate at which the burning takes place and therefore the rate of pressure rise in the chamber. The hammer like blows of detonation literally ring the metal structures of the motor and that is what you hear as pinging.

 

Detonation occurs when the air/fuel mixture ignites before it should. Normal burning has the flame front traveling from the spark plug(s) across the chamber in a predictable way. Peak chamber pressure occurs at about 12 degrees after top dead center and the piston gets pushed down the bore.

 

Sometimes and for various reasons a second flame front starts across the chamber from the original source of ignition. The chamber pressure then rises too rapidly for piston movement to relieve it. The pressure and temperature become so great that all the mixture in the chamber explodes. If the force of that explosion is great enough --- the engine breaks.

 

Pinging indicates trouble. Trouble that does damage. That damage can be quick and catastrophic but usually isn't. Most often, detonation occurances are small in energy and the engine is able to absorb the punishment, at least temporarily. However, over time, even light detonation does harm; weakening pistons and overheating the top piston rings.

 

Severe detonation can destroy an engine literally in a heart beat.

 

Listen out for pinging, if you have an emanuel, put it in say fourth at a low speed and put foot to the floor, the car will accelerate slower and be under a heavier load, should result in pinging if its apparant in your engine / going to happen it will happen then.

 

If you are pinging I would check your O2 sensors, not sure about the Z but on most cars this will obviously give an incorrect reading if faulty / not grounded right, will short and make an uneven mixture resulting in the pinging.

 

I still think it sounds like safety boost but, im not that techy, so seek dome propper advice, just giving my opinion.

 

(i'll prolly get my balls busted by duff or someone now!)

 

Steve

 

 

Thanks for your help mate, I will do some diagnostic checks see what it comes up with