Finally after a year engines in all fitted looks very pretty even turned over first time. YAY!!!!!

 

However front 2 injectors wont fire??

 

Checked coil packs there working fine, havent tested power yet as it was getting dark but wondered is there any common fault or newbie mistake ive made fitting that would cause only the front 2 injectors not to fire??

 

thanks Craig

 

PS still sounded bloody awsome on 4 lol

ECU plug not in square.

 

Jeff TT

Take it yove had that before Jeff, its probaly from where i put soldered the AVCR wiring in.

 

Thanks Craig

Take it yove had that before Jeff, its probaly from where i put soldered the AVCR wiring in.

 

Thanks Craig

 

 

Yes, check the shape of the blue connector and make sure it is flat against the ecu.

 

Jeff

Ok will do thanks

anyone know what pins on the ecu these are?? just so I can double check the pins themselves

 

Thanks

this any good?

 

http://www.300zx.co.uk/cgi-bin/manual.cgi?list=efec&dir=&config=&refresh=&direction=forward&scale=0&cycle=off&slide=140&design=default&total=190

More info here too.

 

Jeff TT

 

 

http://www.allpinouts.org/index.php/1990_-_1995_Nissan_300ZX_ECU

Thanks Jeff, that heaps better.... :)

Thats brilliant thanks guys

right update, checked all coilpackes these are firing, by holding a screwdriver to the 2 injectors in question they are ticking nicely?? but still the cyclinders are not working?? any ideas???

 

Could they just be duff injectors or is it worth me putting some injector treatment in??

 

also done an ecu check and comes up with code 55 no fault found??

 

Im kinda confused any help would be appreciated.

 

cheers Craig

Check for corrosion on the injector terminals and inside the plug, i had green gunk in mine, which caused a misfire.

 

Also if you have an electrical tester, do a continuity test from the ecu to the injector plug, probably need some extra wire on the tester to reach. At least you can see if there is a break in the injector loom.

yeah checked them and cleaned them both, gave them a good dose of wd40 aswell ??

 

My prob is they sound like there firing but, nothings happening, still only runs on 4 cylinders??

I think sometimes even by using the screw driver in the ear test, it can sound like clicking as you get the vibes along the rail from the others that do work.

Its odd to have 2 gone, which ones 1 and 2 ?

If you have to change them, its plenum off again :huh:

Edited September 5, 201114 yr by groover

Is there fuel getting to the front 2 injectors?

Also are the plugs known to be good?

Is there fuel getting to the front 2 injectors?

Also are the plugs known to be good?

 

Well im gonna make the assumption fuel is getting to them as the other 4 are running fine, the plugs are new plugs only replaced last year, im not sure how to check the signals on them though, im wondering if while the engine was out and ive been moving the loom around if ive disturbed them.

 

can anyone explain in idiots terms how i can check the signal from the ecu to injectors??

I think sometimes even by using the screw driver in the ear test, it can sound like clicking as you get the vibes along the rail from the others that do work.

Its odd to have 2 gone, which ones 1 and 2 ?

If you have to change them, its plenum off again :huh:

 

im not sure what numbers they are its the front one on both bank nearest the front of the car, and im bloody preying its not plenum off again, if so its taying dead until i can find some 555's, this car is really starting to piss me off now:(

I did in post 12 lol,

 

Use a multimeter to check the Ohmage at the injector across the 2 pins you should

set to Ohms Ω Look for around 10-14Ohm Ω. Anything significantly outside this range is faulty and the injector will either be supplying too much or too little fuel.

on the loom?

Take off the ecu plug and connect one end of the tester to the appropriate pins 101=inj1

103=inj3, 105=inj2, 110=inj5, 112=inj6, 114 =inj4 the inj grounds are 107 and 108

 

So the easiest thing to do to make a continuity test, is to short the pins together on one injector plug and with the meter inside the car, place the pos of the meter on pin 101 of the ecu plug and the neg of the meter onto one of the grounds (107 or 108) and if there is no break in the loom on that injector plug you should get a beep from the meter, ( assuming your meter has the beep facility)

Repeat for inj 2, at least you can eliminate a break in the loom on those injectors.

thanks graham, appreciate the idiots guide :)

well checked across the injectors and getting 12 Ohms on both so im assuming there ok?

 

gonna have to wait for the rain to stop before i can do a test on the wiring

Yes 12 ohms is fine, so luckily for you, you dont need to take the plenum off, so just the loom in the way.

Have you changed your ecu or do you have another to try, just to rule that out?

yeah I have changed the ecu but havent got another spare now :( was on the car at 6 this morning and looking at the ecu plug can anyone tell me is there a blank near pin 114 because I have and from the wiring diagram im looking at that should be pin 114 im obviously doing something wrong, can anyone tell im shite at electrical diagnostics, At the rate im going unless i can find some help theres no way im getting to JAE :(

make sure you are looking at the right pin!!!! the one beside 114 is blank

 

Ahh thought so, thanks would help if i learnt to use a bloody multimetre properly lol