Misfiring???

[Andy]

Just took my Nova 1300 for a spin round the block and when you reach mid-high revs under load it seems to misfire/valve bounce and lose power,but is ok once you change gear.Ive just got really mad with it because i had left the expansion tank lid loose after topping up with coolant causing it to boil over and burn me:mad::mad::mad: I hope this is nowt major because ive only just changed it! Please help:cry:

[NovaBoi92]

timing belt? valve timing maybe

[Lee]

It wont be valve bouncing at mid revs. First checks are dizzy/rotor and leads, and plugs.

[Andy]

Dizzy cap,leads and plugs have all been changed in the last 7 days??? so if its not valve bouncing its definately a misfire? its only towards the end of the gear though,runs perfect up until then

[Andy]

Just a quick thought....this wouldnt have anything to do with that "resistor" wire on the 1litre loom that was spoke about in the 1300 thread would it?

[Leeboo]

Oh not good to hear Andy. We just got tthe 1300 running today, wired the coil from the 1.0 wires like you did. Hope its not this. We haven't had it out for a spin yet.

[meritlover]

maybe the water boiled over onto your coil causing the miss-fire?

[Welsh Dan]

Andy, wire up another 12V feed to test. There's a nearby one on the passenger side headlight (when its on lol).

[Andy]

Thanks for the replies i shall try that later today.It has done this before meritlover before it boiled over so i put it down to shagged leads and dizzy cap etc.Leeboo-at least its you will definately know for sure if you do need that wire lol lol lol

[General Baxter]

It wont be valve bouncing at mid revs. First checks are dizzy/rotor and leads, and plugs.


im sure i posted a photo of what happens at 8000+rpm on std tappets lol

[Andy]

It does it from 5thou onwards,ran a seperate wire to the coil,still no luck

[craig green]

I would look towards plug gaps (did you set the gaps?) & maybe try earthing the alternator bracket/tensioner to the -ve terminal.

A poor earth through the alternator/block can mean the ignition system doesnt have a good enough supply under full load. (likewise, check the earth strap on the gearbox/chassis leg) & any others you can see... Whats the battery like?

[Andy]

Battery is good,ill go and check all those now.I dont think its plug gaps i think its something else because it did it before i changed th dizzi cap,plugs and leads.Ill have a look at those earths.

[craig green]

Don't look at them, sort them!

[Andy]

Still no joy i cleaned those up aswell

[Andy]

When i revved it up to the point it does it i kept my foot there at the constant point and it stopped for a second then started doing it again???

[Spudly]

Double up your earths just to rule that one out, but also look at your fuel lines/return.

A 1ltr doesnt have a return whereas a 1.3 does iirc if this is the case could it not be vacuuming in the tank and restricting the flow of fuel causing it to struggle/cut out and underfuel?

[Andy]

Its got a sr tank on,i doubled the earth points with jumpleads earlier,the feed and return are there.Im puzzled,think a trip down the road to boggys is in order

[Leeboo]

I'm having problems with my fuelling aswel Andy :mad: .

I ran the return back into the main line using a T piece but still having problems! I tried bypassing it there but it gave up after a minute ot two again.

Any other ideas on what to do with the return?

[Andy]

What is it doing? The same as mine?!

[Leeboo]

No Andy I haven't had it out for a run, just got the water pipes plumbed in to match the 1.0 radiator.

I don't know how to get it fuelling right. I don't have an SR tank so i am trying to sort the return. Its not working with the T piece method. I tried bypassing the filter and return there now and it ran perfect for a few mins and then died out and wouldn't start????

[Andy]

Is the pump ok? i had to change mine,it should be ok with the t piece.Well thats what i was told anyway.

[Leeboo]

Yeah the pump seems to be firing out fuel!! None of us can see why the return is needed. We have tried the T piece but its still not right. Haven't a clue what to do with it. When we do actually get it going, it goes really well, revs/idles fine. Just wondering why it ran for a good while fine and then died out (this was when we had bypassed the return).

[Andy]

It will die because of the return. i got mine going with the 1l tank on aswell then it runs out of fuel because the return isnt there,if you have put the t piece near the tank and then ran the return off the carb back to the t piece it should be working ok.If you imagine a circuit it runs like that supposedly.My problems are very strange.Ive tried all sorts,I think mine could be down to fuel,or maybe something to do with the choke even?

[Leeboo]

Well I've just gone out to the Nova again there andy, it wouldn't start. The fuel pump isn't even putting out fuel now? Whys that?

Ah we just fitted the T piece in the engine bay, does it work better nearer the tank?

I'm not sure what your problem is Andy - just thought if you're problem was fuelling then it wouldn't just be happening at high revs?

[Andy]

regarding the non-return in the 1 litre tank, a return can simply be t-pieced into the feed without any problems, the pierburg 2e3 carb has a small fuel reservoir which has a feed from the tank, a feed to the carb and a return to the tank, simply t-piece the return back into the feed and it should work fine

maccas
This is what i got told to do when i asked before

[Leeboo]

Ah cheers Andy.. not really sure what to do now..either try running the return back near the tank or start looking for a tank with the return plumbed into it. Thanks anyway.

[Andy]

Either try that method or look for a 1200 etc tank.Any carb model except of course 1litre lol

[Leeboo]

Yeah cheers mate, I've asked my Nova parts sourcer to try to find me a tank lol.

My friend wants to try an electronic pump, wired to the ignition? He reckons that it might work then without the return because the electric pump will only produce the amount of petrol thats needed?

[Andy]

I dont think that would work because the carb has a return outlet,it therefore needs somewhere to go,if you know what i mean.The leccy pump would just do the same job as a mechanical pump but you would be stuck with the same problem

[Spudly]

Have you had a faff with your dizzy yet andy slacken the bolt underneath it and rotate it towards or away from you with engine running and you will hear the change then leave it where engine seems happiest and give it a few squirts to see if this has helped!

[Andy]

Tried and failed yesterday