Hi guys, just seeing if anyone has any ideas...

 

I've just done a full re-build, re-bore, oversized pistons etc.

 

I have fully put the engine back in, but, when i tried to start it, it would turn over but not fire up. I did an ECU diagnostic, which told me it was the det. sensor, after further examination, i discovered that one of the wires was broke on the plug from the det. sensor. I have repaired this, but still no joy, it turns over beautifully, and there is a spark, and after removing a couple of spark plugs to have a look at them, they are dry, and no smell of petrol. Could this be a fuel issue?

 

Also, if the det. sensor was faulty, or the PTU, would there be a spark? If not, then I can eliminate these, as there is a spark...

 

I have removed the fuel pipes going to the fuel bar (next to the balance bar) and there is pressure (I know that because I got covered in petrol :-) So the pump is working, plus, I can hear it kick in when I turn the ignition on...

 

Any ideas? Any help would be greatly appreciated, I really want to get her going after the graft I done on her!

 

Cheers guys....

If the CAS is faulty it stops the injectors working (hence no fuel).. I can't remember if you still get a spark though.. Sorry I can't be more helpful :(

Does the exhaust smell of fuel?? If not then there must be an issue between the pipe you pulled off and the cylinders? spark + Fuel should be running? Wierd!!!

Thanks guys, there is no smell of fuel from the exhaust, i haven't put it on yet, so i can get my head right under it whilst turning it over, and no smell of petrol...

 

What is the CAS? (sorry for sounding numb :-)

I'm guessing the CAS is the crank angle sensor? It isn't showing up on the diagnostic. Strangely tho, about 1 in five tests gives me code 34, det. sensor, wierd, but other tests give me 55, all good. I have had a problem with the det sensor before, and i seem to remember that it stopped the spark, but I've got a spark.

 

It's got to be something to do with the fuel line, is there anything after the fuel filter that could be causing it? I've had a good look for kinked pipes, dodgy wires/plugs etc, but no joy.....

 

Cheers chaps...

just a guess but could there be a problem with the injectors!

 

dan.:)

iirc det sensor won't stop the car from running, simply put it in safety mode

 

at this point my dad would suggest to put a thimble full of petrol into one of the cylinders (take spark plug out) If it ignites then its fuel to the cylinder thats the problem. Don't know if that would work on a Z though?

Can you hear the fuel pump priming when you set the key to position 2 (where all the lights come on the dash prior to starting)

 

Sounds like the CAS to me though mate

The ptu might be the culprit, if the connectors are not in tightly, it will not fire. The ptu is like a distibutor.

If you are getting sparks on all the plugs then you can rule the PTU out. The PTU only controls the sparks.

 

If there is pressure in the fuel lines then you can rule the fuel pump out.

 

If the cylinders are not getting wet then you eithe rhave an injector issue or a Crank angle sensor problem.

 

If the ignition on but not started, rotate the Crank Angle sensor and listen for clicks. Each of these clicks are the inectors firing. If you don;t hear the clicks then check the connections to the cas with a multi meter. If the connectors are good, look at getting a replacement CAS to try.

 

If you are getting clicks but still no fuel then it may be a problem with the electrics between the ECU and the injectors. IIRC the injectors take a constant live which is one feed, they then recieve a pulse earth to fire. So may be worth checking that the injectors have a constant live to them as this may be the fault.

 

From what you are saying, you are either looking at the injector wiring, the Cas or wiring or a blockage in the fuel line just before the fuel rail.

 

Hope you can find the problem. Let us know how you get on.

did you connect the fuel hoses correctly ? (eg. swapped feed/return)

Wow, thanks guys.....

 

Yeah, I've got the fuel pipes on correctly, and I turned the car over with the return pipe off, and it's pumping through nicely....

 

Anyway, the situation has slightly changed now.... I had left a plug off without knowing, from a sensor at the back of the plenum (not sure which it is).

 

So, I started her up, and she started, but only on what sounds like 4 cylinders (?)

 

There seems to be fuel going through now, and a spark, but it isn't igniting, sounds like timing, and also it now is only detonating in cylinders 1 and 2, so it's got worse, which is making me think it could be the CAS? Although the CAS has been removed, I marked it and it is back on in exactly the same position, and I have cleaned up the connectors too, maybe it's knackered? I think I will try turning the car over whilst slightly adjusting the CAS, it's all I can think of!

 

Thanks again ZedHeds, top geezers!!!

 

Tudor...

If it was the CAS, you would think it would show up on the diagnostic, but it doesn't, but I do get randomly the det. sensor, but only occasionaly, any helps really appreciated guys, this is gettin on my tits now :-) Just wanna hear the beast roar, not just splutter on four cylinders, hehe.........

 

Nice one....

 

Tudor...

So you are definately getting a spark from all 6 plugs ?

All cylinders are getting fuel ?.

 

If you have cylinders not getting a spark, check the feeds to the coil packs with a multi meter to see if they are getting a signal. If you find it's 1 & 2 or 5 & 6 that are not sparking, it's more than likely to be ptu related. Disconnect clean and reconnec the PTU.

 

If you have cylinders not getting fuel, check the feeds to the injectors with a multimeter to see if the injectors are getting a signal. If not check to make sure the cas is sending the signal. i.e. igniton on , engine off and rotate the cas.

 

If you have both spark and fuel, you need to do a compression test.