Replaced the PTU and the coilpack that was broke today (thanks phil!). Fired her up and its not a bit better.

 

So then, onto the fuel system.

 

Im presuming the signal from the CAS goes to the ECU where it is processed and the injectors are then pulsed...

 

IS there any chance it could be a CAS problem? Could a bad connection cause it form the CAS? If there was a bad CAS connction would it not show up as a fault on the ECU?

 

Has anyone ever had an injector stuck?

 

People who have had upgraded injectors... how much does it coat to have them changed?

 

 

How can you test the injectors? IVe heard of testing the resistance across them, listening to them with screwdriver, and turning CAS manually. Can anyone go into more detail of any of these methods.

 

 

Finally, is there any chance it could be anything other than the injection now? Could it be a more severe engine problem?

 

Thanks a lot for help guyZ..

 

Clarkey

 

------------------

sorry 2 hear that bud, i know the feelin.what i said earlier still stands though mate ok? just bring em down when ur in the vicinity.

nah will keep the PTU, its good to have a spare. Havent really looked at the exhausts much m8, but they look pukka, will get those bits patched up and put em on when the engine gets fixed, cant wait to hear what they sound like

 

Might come down to get the speedo chip off you some time.

 

Cya m8

Erm, CAS CAS CAS... Check the connector on the CAS

 

The CAS can cause similar symptoms to PTU as it is used for the timing of both ignition and fueling...

 

HTH

 

CheerZ,

 

Andy

ok then andy, how do you get the CAS off, is it a delicate thing? IS it possible to put it back on incorectly and screw up all the timing?

Yes you can screw it up - just check the connector. You really need to know what you are doing if its coming off

 

CheerZ,

 

Andy

ok , ill have a look in a bit. It had to be cylinder 5 didnt it! To get at the injector I have to remove the fuel lines from above it!

Could it be the wiring to that plug? Have you checked that?

With all the heat under the bonet wires pipes and other things go tits up.

 

Stuart

yeah have tested the wires they are all fine.

So the wire with the misfiring cylinder is fine? :S

Very strange.

From where to where did you test? Becuase we all know about the sockets being buggered.

So there is a signal going from the PTU, to the spark plug. The plug is firing?

The only thing left is there is no fuel going into the cylinder.

 

 

Stuart

have u tryed using a colour tune it is a glass spark plug that u use to set up carbs but with one you could see if it was the plug that was not firing or if it was fuel starvation just a thought m8

 

ps you can buy en at halfords very handy tool

whats his thing you speak of toger13? Sounds useful

 

I took the CAS connector off, it looks fine, ill sand the connections and spray em later when its not so wet outside!

Also in the process i lost the plug retaining clip thing, anyone got a spare one of these for a CAS connector? Ill gi'ya a SAE with 25p in for one

Sorry to disappoint but a color tune would be useless on a zed - it is a tuning tool for carburetors - you set the carb up according to the colour of the burn in the cylinder....

 

If you wanna check for a spark on a plug, simply remove it, plug it into the coilpack, touch the body of the plug on the block and see if the gap sparks.... carefull you don't touch it though LOL

 

 

HTH

 

CheerZ,

 

Andy

ok, for an update...

 

put the CAS connector back on aftr cleaning, put it back together.

 

Fire her up and.......................................................... no difference!

 

Anyway

 

I saw on ttnet or something to see if an injector is working, put a screwdriver on the injector and listen to the handle. So I did, I tried it on cylinder 3 first, sure enough, tick tick tick tick tick..great! So i moved it to cylinder 5, and.....

 

tick tick tick tick tick tick....

 

What does this mean? I have spark and an injector pulse but its not firing, whats goin on!

Clarkey

 

I had a similar problem once mate and it did my swede in! I lost an entire bank of the engine all of a sudden. Air travelling through the system nicely 'coz I had hot air coming out of one exhaust and a similar amount of cold air coming out of the other.

 

I listened to each injector with a metal bar and they were all ticking. I took each spark plug out and earthed it against the head. They were all sparking.

 

The other engine bank worked perfectly so that ruled out CAS, etc.

 

Air, fuel, spark and another engine bank working perfectly. Could only think of damaged internals or head gasket.

 

However, after a few hours, it just sprang into life again. Worked perfectly. Never did find out what it was but could only hypothesise on some sort of air lock in one side of the fuel rail.

 

This probably doesn't help you at all but I thought I'd drop my 2 penneth in for what it's worth. I understand how confusing it is when everything appears to work but it's not doing what it should!

 

Good luck mate.

ok, that sound promising. How do you bleed the fuel system then people?

Compression test next unfortunately Could also be that even though the injector is firing, it is blocked...

 

CheerZ,

 

Andy

i ment use the colour tune to see iff the plug was firing under pressure because the more presure the plug is under the more voltage needed to create a good spark on an old car with normal carbs it needs between 9000 and 20000 volts but with modern electronic ignition systems it can be over 60000volts at the coil just wondered if the was a fault in ether the primary or secondary circuit causing no spark under pressure but sparking under normal outside air pressure just thought that with colour tune you could see what was happening in the cylinder if not try a compresion test m8