need help!! wont idle back fires and no throttle response

[tbathurst]

i recently bought a 90 300zx it is running very badly im trying my best to retrace vacuum lines not hooked up replacing bad sensors and clips but i have a sensor below the right cam with wires hanging off it but not hooked up is this sensor my camshaft position sensor it is behind the cam cover too. all my injectors are running 12 ohms my coil packs all have spark there is black carbon build up on my plugs but it has no power after 3000 rpms it boggs pops and back fires any suggestions please help iut also will no longer idle it trys to die with any rpm less than 2000

[itsa300zx]

Check the ECU for codes, it's prob. the MAF

[evildky]

yup, chek the codes, although I was thinking CTS, ints the sensor ont he hard coolant pipe ieht the 2 wire connections, check that it's connected properly

[jas_mathews]

well first of all, i would plug the sensor back in. The cam position sensor is a round plate looking thing held on by three bots in front of the timing belt cover. If you are looking at it from the front of the engine bay it is on your right side. Who ever you bought it from may have been playing with the timing trying to get it right and really screwed up. I have had the symptom you describe when other cars of mine have had the timing extremely off. Some people think that they can adjust the timing without a light and will attempt this causing big problems.

[tbathurst]

i have checked the belt and all the timing dots they all line up the sensor i am trying to plug in is behind the timing belt . also if anyone near the twin cities that has 6 stock injectors that would be great if i could buy them off you or trade. my car is a non turbo and was flooding out really bad do to high of cc injectors the last owner had no idea what he was doing and put different 3 different cc injectors in the car none of the injectors were obviousley tuned to the ecu

[evildky]

There is no sensor behind the timing belt.

[tbathurst]

i need a fuel injector wiring diagram and coil pack diagram and a vacuum diagram forward it to me if you know of a good diagram i need to know the color of all the wires

[Milton'Z Nissan'Z]

You should post some photos to take some of the guess work out of it for the people trying to help

[tbathurst]

ok i only need a vacuum line diagram for all the lines comin off the plenum sorry about not posting pics im new to this and havent figured out the forum to well yet

[tbathurst]

i need a 270cc injector for my 1990 nissan 300zx let me know if you have one laying around or i can buy it is the old style square top that i need

[grk nickafis]

http://www.z1motorsports.com/product_in ... cts_id=948

I have the same problem, I went through 3 ECUs and sparkplugs and vacuum testing and a bunch of other chit trying to figure it out. It's got to be the injectors. I found this on z1, hope it helps.