520 replies to this topic

[Ben_O]

 

 

I've got a borescope

Would one enable me to see in there ok?

I'll send you it

 

Are you sure?

 

You have already done so much. I owe you beer...

[jime17]

A long shot, but is it getting 12v at the plug?

The tee in the wiring on mine that i mentioned earlier had corroded and the resistance resulted in only 5v. Not enough for the camshaft sensor.

Maybe you have enough voltage to light the bulb right not to open the injector. You might have to chase the loom back towards the ecu to be sure.

[Ben_O]

A long shot, but is it getting 12v at the plug?

The tee in the wiring on mine that i mentioned earlier had corroded and the resistance resulted in only 5v. Not enough for the camshaft sensor.

Maybe you have enough voltage to light the bulb right not to open the injector. You might have to chase the loom back towards the ecu to be sure.

Sounds like you may be onto something there. I should be able to test it with a voltmeter no?

 

Worth a shot i guess. I suppose i should see perhaps if the bulb glows brighter on one of the other injectors?

[Jordie]

Renault electrics  = devils work.

[Tamworthbay]

Renault electrics  = devils work.

I hate to be right but look at post #17. I think they are still paying us back for the last war.

[Jordie]

 

Renault electrics  = devils work.

I hate to be right but look at post #17. I think they are still paying us back for the last war.

 

 

Haha yeah.

[Badboytunes]

_{So........... The bulb flashing, would indicate that the injector is getting a signal to squirt derv. I know I asked ysterday but if you slacken the pipe to the injector, is there fuel getting to it? If so, then I am a little confused as power and fuel "should make the injector fire ( unless as stated above re low voltage.}

 

_{I assume you have a spare injector as you bought  replacement. Could you not connect the fuel pipe and electrical plug and see it if squirts feul when the engine is running? If it does, then it sould suggect a more serious problem within the engine. If it doesnt fire then im still convinced its electrrical, although what it could be I have no idea. I was thinking it could be a worn fuel pump but nortmally they over fuel when worn......}

 

 

_{I have been scratching my head that much, I have no hair left}  

[jime17]

_{So........... The bulb flashing, would indicate that the injector is getting a signal to squirt derv. I know I asked ysterday but if you slacken the pipe to the injector, is there fuel getting to it? If so, then I am a little confused as power and fuel "should make the injector fire ( unless as stated above re low voltage.
 
I assume you have a spare injector as you bought  replacement. Could you not connect the fuel pipe and electrical plug and see it if squirts feul when the engine is running? If it does, then it sould suggect a more serious problem within the engine. If it doesnt fire then im still convinced its electrrical, although what it could be I have no idea. I was thinking it could be a worn fuel pump but nortmally they over fuel when worn......
 
 
I have been scratching my head that much, I have no hair left}  

I'm sure I remember reading that fuel was getting there and returning via the return pipe.

I'm not convinced that a digital multimeter will react quickly enough to register.

As bad boy tunes said, maybe you can see if the injector is opening by cranking with it removed from the head but still plugged in.

Be careful though. A lot of psi involved so stand clear.

Have you tried easy start?

You could get it running with all injectors in.

While its mis firing on tickiver, spray the easy start in the air intake.

If the misfire momentarilly goes away when the easy start is being drawn in then you will know that fuel isn't the being delivered for some reason.

If the mis fire persists then it looks more like compression problems.


im no expert so someone might correct me on my assumptions there... Lol

Edited by jime17, 03 October 2014 - 06:39 AM.

[KaneH]

I'd agree with your point on testing the injector. Leave the wiring and fuel attached but with the injector removed from head. Grab yourself a small bucket and hold the injector in there while someone starts the car, if you see a similar spray pattern to the other injectors (obviously test these in the same manner) then the injector is not the issue.

Edited by KaneH, 03 October 2014 - 06:54 AM.

[Carlos W]

All the lines to the injector are solid so I'm not sure how easy fitting an injector which is not in the head will be.

The engine runs a lot better at higher revs, so now the injector has been ruled out I'm leaning towards a compression problem.

I wondered whether the glow plugs could be removed from all 4 cylinders, pour diesel into the faulty one, put the glow plug back into that one and turn it over by hand in a kind of leak test. If the valves aren't sealing the diesel will leak past.

Probably easier than taking the head off

[Jordie]

Wait, you still dont know if the injector is opening letting fuel into the cylinder?

 

A leak off test would show a problem, ie. the cylinder/injector with the problem would return more fuel in the leak off test. If its a massive amount compared to the other 3, then it would appear the injector is not opening and letting fuel into the cylinder, which could indicate an electrical fault from wiring/ecu. (as you have said the injector works fine in another position?)

 

Then if you move the injectors around, re-do the test and a previously good injector into the faulty cylinder location and if the same results on that location, id say its an electrical thing which isnt giving the signal to that cylinder.

 

Re testing an injector out of the engine, some of the solid pipes have unions so may be able to slack the pipe further back, turn and tighten to give a better angle. Definately keep back, wear gloves and eye protection.

[sledgehammer]

My money on compression -

 

either head gasket ,

 

or valve stuck (inlet - due to chugging in inlet manifold)

Edited by sledgehammer, 03 October 2014 - 02:20 PM.

[Ben_O]

Or all 3..... 

[jime17]

Or all 3..... 

Lets go the whole hog and have a crack in the head

[Ben_O]

and a warped block deck...