hello i have a 7th month or 1982 280zxt an i need help with performence parts how to install a new BOV ? how to stop it from back fireing ? please e-mail me at whitetiger88101@yahoo.com ps. i tried arizonazcar.com and called them and they were no help and im tired of going to the nissan car dealership and paying a 80- dollars check up fee.. im growing frustrated any honest people out there what would like to help me out with out any money in return ?

 

yikes bro! wait... first welcome! now back to the prob: it could be several things if it's backfiring... but 2 basic ones: timing, or wrong fuel mixture.

So check the timing first... make sure you unplug the throttle body sensor, and set the timing to 20 degrees. Next, pull the spark plugs & look @ the color of the tips... and also make sure all 6 look the same. We'll start w/ that.

As for a BOV... you can get one from ebay for about $35 - $50 w/ a weld on flange.

 

Hello belive it or not i just went out side pulled off all six plugs an they look brown ? all six..i have set the distributor cap in the middle ...car runs good for the first 15 min 0-60 in about 7. seconds or less as i have straight exhaust no cats hks exhaust straight threw.. how an were do i weld on the new BOV? i am told that the BOV is on the top of the exhaust pipe.. i think i found it !!! but is there an easier way instead of welding on ? umm how do i check the fuel injectors to make sure there working right by the way i just found out my casting number is a p-90a with the hydralic lifters.. ? when i drive the car for about 15 min the car stumbales an does die.. feels like no power at all ? detenation ? ( im about to cry i love my 280zxt and i just want her to be road worthy by the end of this month

 

The BOV (blow off valve) has nothing to do w/ the exhaust & the 280zxt's didn't have one from the factory. The BOV bleeds the boosted air off, when you spool the turbo, then quickly let off the throttle, creating a huge + pressure between the throttle body & turbo, which can slow your re-spool. You can weld it onto the J-pipe w/ no probs.

You might want to hook up an air/fuel gauge to see if you are running to rich or too lean.

 

i have installed new split fire spark plugs part number sf6c i have bought all new wires cap an rotor were do i put the rotor to witch spark plug ? maybe that might be a probelm ? umm when the car is started and in nutrual i rev the engine to 3,500 rpm them BOOM loud *** back fire.. could it be bad fuel injectors? so i weld the BOV to the j pipe were is the best place on the j pipe ? i thought the BOV was the little value that the top screws left or right ? on the exhaust flange.. ? darn it i lost my 280zxt hanyes manual too !!! arg.. i bought a new fuel pressure regulator bosch i belive could that be the cuplret ? what would u sugest i do ? and buy ?

 

LoL... kinda sounds like you crossed some spark plug wires in the process? Gotta make sure those are all in order, or the firing order gets all wacked. I think the "valve on the exhaust" that you're talking about is the O2 sensor...

 

No... umm when i put on the new cap an rotor i didnt know there was a little screw that uihad to take off to put on the new rotor ,so i tried to start the engine to turn the rotor so i could be able to unscrew it.. in doing so were does the rotor need to sit ? does that make any sense ? lol im confusing myself..um from clock wise starting from the 1 mark what is the fireing order? 1,4,2,6,3,5, ? is that right ? hear is the list of items ive bought and done.. fuel pressure reg. spark plugs cap an rotor an wires. fuel filter new 88 oct gas with fuel injector cleaner i have cleaned the throddle body door with throddle body spray.. i have a huge list of things i have done to the since i bought it.. any body else can help me ? p.s. i already bought a new oxygen sensor...

 

not sure if the newer Z's are the same as the older ones, but the firing order is 1-5-3-6-2-4, starting from the wire closest to the front of the car.

 

Any body know were the rotor must be set ? cap an rotor for the ignetion wires? any body who works on 1981-1983 280zx turbos ? im looking for help ?

owner of a 1983 280zxt 2+2 with manual trans blue in blue out
owner of a 1993 300zx 2+2 with auto trans white out black leather inside

 

Yep like fast240 said. The firing order from the front is 1-5-3-6-2-4. It is on my '81 and '82 n/a. It is marked F inside the dizzy cap. I do know the Turbo dizzy is diffferent from an n/a Z. And as for the plugs, NGK are the best for these Z cars. But yeah your spark plug wires are crucial to be in the right order. My Z's ran with them wrong, but not well. And they did backfire. And I was only off one position, but that is all it takes.

 

Rotor position does not matter. The rotor should be notched so that it can only slip on in one direction. Make sure the cap is on the correct spot and then start plugging the wires on in order. Counter clockwise from #1. (right? )

 

from my rotor and me standing on the front left drivers side i looked at the cap na rotor and from on top of the rotor there is a little number 1 so i went from there 1,4,2,6,3,5 going clock wize.. yall are telling me to go clock wize ? 1,5,3,6,2,4 ? or conter clovis wize ? also could bad plugs or bad or cloged fuel injectors make the car back fire ? or a fuel pressure regultaor ? bad ? hmmm ?

 

counterclockwise from 1, try that and see.

 

With 1-5-3-6-2-4, that is what my manual says.

 

Yep Wildman is right.. As for a BOV there is no real purpose if you are running stock everything else.. except for th PSSSHHH sound..

 

1-5-3-6-2-4 firing order.
Starting with the number 1 mark on the cap and going COUNTER-CLOCKWISE plug in the wires in the firing order.
As for the blow off valve, if you don't weld it on it will leak and that means you're going to lose boost and you don't want that. You can buy pipes with flanges aleady welded so you can just bolt on a BOV. The pipe will have to be cut to length though as none are made for the 280zx that I know of. The valve on the exhaust is the wastegate, which controls boost. The Z's had internal wastegates though, so if you got one on you exhaust pipe then it's aftermarket. The BOV does NOT control boost, it controls compressor surge which can easily destroy a turbo. A BOV is NOT the same as the POV.
As for the rotor, it will only install one way. If you pulled the distributor from the car and that's why you don't know where the rotor should point, then pull the valve cover and turn the crank until both intake and exhaust valves are closed. Then install the rotor and it should be pointing relatively close to number 1 on the cap. As for checking your injectors you can run a resistance check and you can also get a noid light on loan from any auto parts store. It plugs into the injectors and flashes rapidly if the injector is firing. As for the backfiring, check timing. If that's good then check your valves and make sure they're adjusted right. If ones overtight it can hold a valve open and give a backfire. If I missed anything ask again, too much confusion in this thread

 

Did these problems happen before you put the wires, cap, and plugs in? I'm thinking either crossed wires (which would make a steady back fire, and get more frequent with revving), or timing is off...check both of those. screw the BOV till your Z is running just right!

 

GooD news i was able to fix the problem.. about 4 cups of heavy rust was cloging up the fuel filter in t he fuel tank.. no wonder why it felt like i had no power lol fuel tank is getting refinished today !!! i will be reistalling it today and i iwll leave a new up date.. i will be taking pictures too

 

Glad to hear you fixed the problem, looking forward to see your pics.

 

Nice... glad to hear that fixed it.. Sorry for getting you shocked and almost killing you No hard feelings?

 

ok new up date i fixed the problem got the gas tank redone runs fine now !!! um so fr up grades are a custom made cold air intake with a k&n air filter with filter sheild , straight threw exhaust i just bought a new jsk fuel rail i hope this fuel rail works as i think it will i think all i need next is upgraded fuel injectors and a adj fuel pressure regulator then a up graded ecu thats how u do it right ? lol i do belive thats what im gonna do next i will keep evey one informed on my 280zxt prodject i love my Z u should love your " Z " too

 

I definately love my Z, November is right around the corner!

 

http://photobucket.com/albums/b48/nismo619/?sc=1 <-------- please click on this link to see me and my two 280zxt and my 300zx please for some reason zdriver wont let me post pictures and it wont let me get into the zgarage ?

 

wait... is that 280zx a turbo???

 

LOL in the link i posted its a pic of me and my 1993 300zx n/a and a pic that i got off www.nissanusa.com of the 2008 nissan skyline gtr r35 relised in America in 2008 i think they said 80,000 dollars? and the last pic of me and my 280zx turbo i was stang in the back of the car i love my 280zxt your should love your " Z " too !!!!!