head against brick wall....AAAARRRRGGGHHHHH
Discussion
Hey , i have this problem now for a good six months and still i cant find the fault.
The car will tick over fine and will run fine when cold/warm but as soon as it has been run for a while it will for a want of a word start to miss (well thats what it feels like) bring the car to a stop turn the engine off and back on again and will clear its self , then 5 mins later it will do it again , the thing is it doesn't do it like clock work it is very intermittent .
so far i have changed , fuel pump and filter , the ignition module and the coil, also changed the fuel relays and also leads and plugs
I have also changed the trumpets to the flared carbon ones and have done the smoothbore conversion from Act, the car is running a lot smoother on a whole pick is much smoother but the above problem still exists .
i have found out the vacuum off the dizzy is not holding pressure so gunna change that , and forgot to change the extensions for the plugs. after this i'm lost.
cheers lee
The car will tick over fine and will run fine when cold/warm but as soon as it has been run for a while it will for a want of a word start to miss (well thats what it feels like) bring the car to a stop turn the engine off and back on again and will clear its self , then 5 mins later it will do it again , the thing is it doesn't do it like clock work it is very intermittent .
so far i have changed , fuel pump and filter , the ignition module and the coil, also changed the fuel relays and also leads and plugs
I have also changed the trumpets to the flared carbon ones and have done the smoothbore conversion from Act, the car is running a lot smoother on a whole pick is much smoother but the above problem still exists .
i have found out the vacuum off the dizzy is not holding pressure so gunna change that , and forgot to change the extensions for the plugs. after this i'm lost.
cheers lee
Stepper motor, dist cap and arm could all be at fault. The trouble with such a fault as you may well know (and trying to offer help without hearing it) is you just have to work through it methodically and hopefully it doesn't cost a fortune to diagnose.
Sounds like you need to concentrate on the various bits controlling the idle mixture - Lambda sensors, fuel temp sensor, air intake temp sensor (if these have one?) even engine coolant temp sensor. Also vacuum leaks especially from the inlet manifold might be to blame. Squirt some Wd40 or even just water into the area where the inlet meets the heads and see if the idle changes, if it does there's your answer.
Sounds like you need to concentrate on the various bits controlling the idle mixture - Lambda sensors, fuel temp sensor, air intake temp sensor (if these have one?) even engine coolant temp sensor. Also vacuum leaks especially from the inlet manifold might be to blame. Squirt some Wd40 or even just water into the area where the inlet meets the heads and see if the idle changes, if it does there's your answer.
Hi ryan, it is fine on ticking over , its fine on driving when cold/warm , just seems after it is getting hot the problem happens and it will kick in for no reason what so ever , down the motorway doing 80 it will just kick in ,loss of power and feels and sounds like it is missing etc, but it will do it round town , down country lanes , but every time stop , turn off and back on again and its clear .....STRANGE
Hey Daz, i have changed the coil same time i did the ignition module, its driving me nuts .......just mot'ed it today flew threw , ticked over nicely drove it away and there it was again , stopped at the shop so must of been stood for 30 mins or so and it was fine , drove to the petrol station 6 mile ran sweet , put fuel in it and there it was again except this time it cut out all together and the primer just kept going as if there was no pressure in the pre stat , left for 2 mins and fine again .
on a separate note cheers for the heads up on Hans !! top bloke sorting me out my new brake kit
)
on a separate note cheers for the heads up on Hans !! top bloke sorting me out my new brake kit
)
Seeing as we're in the dark - here's a wild stab...
Could it be a problem with the fuel system? It's possible you are getting pockets of fuel vapour in the fuel supply line.
If, for some reason the fuel supply is getting hot it might vapourise in the fuel lines causing bubbles to form, which the engine can't use. The fact that this is happening only when the engine is hot makes me wonder. Especially after you've changed most of the ignition system.
You mentioned that you can hear the fuel pump priming when it happens. I don't know the system very well, but it seems to me the system gets primed to give some initial pressure in the fuel system prior to start. If the fuel pressure drops because of the vapour bubbles, it's possible the pump detects the low pressure and kicks in to bring the pressure up again.
Having said that, it could also be a breakdown of the resistance of some electrical component due to the heat. (Resistance decreases as temp increases), again this is why you're only seeing the problem when it's hot. Did you say you'd changed the HT leads and plug extenders?
Hope you find the problem.
Could it be a problem with the fuel system? It's possible you are getting pockets of fuel vapour in the fuel supply line.
If, for some reason the fuel supply is getting hot it might vapourise in the fuel lines causing bubbles to form, which the engine can't use. The fact that this is happening only when the engine is hot makes me wonder. Especially after you've changed most of the ignition system.
You mentioned that you can hear the fuel pump priming when it happens. I don't know the system very well, but it seems to me the system gets primed to give some initial pressure in the fuel system prior to start. If the fuel pressure drops because of the vapour bubbles, it's possible the pump detects the low pressure and kicks in to bring the pressure up again.
Having said that, it could also be a breakdown of the resistance of some electrical component due to the heat. (Resistance decreases as temp increases), again this is why you're only seeing the problem when it's hot. Did you say you'd changed the HT leads and plug extenders?
Hope you find the problem.
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