Right i have done the search and found out it could possibly down to the idle control valve or the temp sensor.

 

choke is around 2000rmp and about 1250rmp when it eventualy turns off

so on choke and on idle it seems to be running aporx 500rpm to high

 

Is there a screw on the idle control valve to try to sort this out

 

and where is the temp sensor

 

any help will be super

 

cheerz dave :duffer:

Right i have done the search and found out it could possibly down to the idle control valve or the temp sensor.

 

choke is around 2000rmp and about 1250rmp when it eventualy turns off

so on choke and on idle it seems to be running aporx 500rpm to high

 

Is there a screw on the idle control valve to try to sort this out

 

and where is the temp sensor

 

any help will be super

 

cheerz dave :duffer:

before you start messing with base idle first check the tps,then the temp sensor on top hose engine pipe (the bigger of two) aint dirty as this can mess around with ecu signal and raise idle,then make sure you aint got a vacume leak on pipes including small pipes on ballance bar then see what happens as the base idle really dont change iff all parameters are correct

Ok Will do but whats the TPS. still not sure where the temp sensor is. im still new to the z so havent really got a clue??

 

have you got any pics??

 

how do you check for vacum leaks?? just listen out for hissing?? which are vacum pipes?? prity much everyone under there??

 

cheers

Ok Will do but whats the TPS. still not sure where the temp sensor is. im still new to the z so havent really got a clue??

 

have you got any pics??

 

how do you check for vacum leaks?? just listen out for hissing?? which are vacum pipes?? prity much everyone under there??

 

cheers

where in wales are you

Where do you want me to be lol!!!

 

Im in pwllheli gwynedd, But will travel if you want to help :D

Where do you want me to be lol!!!

 

Im in pwllheli gwynedd, But will travel if you want to help :D

lol, its only i have a conzult and ime near chester but pwllheli is south wales to me :D

A bit to far then, only 2 hrs ;)

 

Will you take a pic for me tomorrow please :)

A bit to far then, only 2 hrs ;)

 

Will you take a pic for me tomorrow please :)

yep

http://www.300zx.co.uk/forums/showthread.php?t=95368

 

Temp sensor 14

TPS 22 (its the flying lead with the grey connector you need to check though)

Andy i think you have posted this up wrong :confused:

 

300ZX.CO.UK Acceptable Use Policy :confused:

Sorry, dunno wtf happened with that :confused: Even checked the link once I'd posted it...

 

Oh well try this one:

 

http://www.300zx.co.uk/forums/showthread.php?t=26120

you got any pictures like that of the pcv valves andy.

Errrrrrrrrrrm will try and take some for you now and upload them :)

Errrrrrrrrrrm will try and take some for you now and upload them :)

cheers dude :D

Here goes:

 

Drivers side:

 

Rear hose and valve

 

Clearer view with bumf out of the way

 

Front hose

Passenger side

 

Front hose

 

Rear hose and valve

silly question to someone with your knowledge, but why do these need replacing when you de-cat a zed

Due to the fact the pistons don't have a PERFECT seal in the cylinders, some of the combustion gasses get past and into the crankcase (bottom of the block), these are called blow-by gasses. These blow-by gasses react with the oil to form acid so must be removed or the bearings will be destroyed fairly quickly. The PCV system feeds fresh air in through the front hoses which then passes through the block and then is sucked into the inlet manifold (plenum) via the rear hoses and burnt off. This is while not on boost.

 

When on boost, the valves close (simple one way valve) and any gasses are blown into the turbo inlet pipes instead. This is not a perfect situation as there is no clean air fed in to purge the system.

 

 

Because the hoses have oil vapours passing through them, they clog up over time. As they clog they become more restrictive and therefore don't work as efficiently. This causes the pressure in the crankcase to be higher. Because the oil return from the turbo runs into the crankcase, this creates a higher oil pressure inside the turbo, giving a higher differential pressure across the turbo rear oil seals. When you decat, the pressure in the turbo exhaust housing is decreased due to a less restrictive exhaust. This further increases the pressure differential across the turbo rear seals.

 

Add both clogged PCV hoses and decat together and this can cause the turbo rear seals to leak sooner than they would with fresh PCV hoses.....

 

Bet you wish you never asked lol

lol that told me did'nt it. that song I NEED A HERO shoud've been named after you andy like i've said before your a star.

sorry andy not too sure on this do i just need to change the hoses or the hoses and the valves cos i've had a look at the car, the hoses are easy enough but i dont know where the valves themselves are. :nelson:

Sorry, dunno wtf happened with that :confused: Even checked the link once I'd posted it...

 

Oh well try this one:

 

http://www.300zx.co.uk/forums/showthread.php?t=26120

 

lol!! i thought i had one something wrong :)

 

Cheers for the help, i will give it go tomorrow. we shall see what happens?? fingers crossed :rolleyes:

sorry andy not too sure on this do i just need to change the hoses or the hoses and the valves cos i've had a look at the car, the hoses are easy enough but i dont know where the valves themselves are. :nelson:

 

LOL replace both. The valves are screwed into the plenum, basically at the front of the rear hoses...

cheers matey thats a really big help.

 

i will give it go tomorrow. we shall see what happens??

,,,,bump,,,,

Did you find out what it was in the end? Mine is doing this now, it was running beautifully before this and now it won't go away also the boost seems to hold back couple of psi but I think that may be down to the blowing exhaust through the middle gasket, thought I'd mention both problems as they appeared on the same day.