Engine Misfire

[sideways danny]

honest to god, if it's an FSE power boost valve, remove it and refit a standard one

[Wobba]

I've just changed the fuel filter, and been out for a test drive.

It seems to have improved it somewhat, but I still get the occasional misfire.

I've also heard that there could be a problem with a leaky rocker cover and oil leaking into the chamber. Is this something that anyone has experienced?

Starting to struggle for other items to try myself now, but i'm prepared to try any other suggestions before it goes in to the garage!

Cheers.

Just to eliminate a possible easy solution, remove spark plug cover, disconnect king lead from dizzy (just in case hehe), pull the HT leads off the spark plugs, get a torch, shine down each plug well and if you see any wells full of oil, you need to clean it up.

Clean it out by taking the 10mm securing bolts off the plastic plug cover, remove oil filler cap, yank the plastic cover up and put to one side, clean out plug well (I often just pop the plugs out to clean them of oil as well and let the oil drain into the chamber hehe).

I have a leaking camcover gasket (rubber megane one) and it can cause misfires.

[cjspindler]

Right - the plot thickens!

I've taken the car to a Renault Specialist, and he has diagnosed the problem as a short on the throttle cable.

I havent seen where exactly he is on about, but apparently there is signs of wear on the cable and it has gone green.

I've looked on RPD and can get the cable for about £20. Is this an easy job to change? Or do you think it's worth just getting the "specialist" to fit?

[volymmannen]

Right - the plot thickens!

I've taken the car to a Renault Specialist, and he has diagnosed the problem as a short on the throttle cable.

I havent seen where exactly he is on about, but apparently there is signs of wear on the cable and it has gone green.

I've looked on RPD and can get the cable for about £20. Is this an easy job to change? Or do you think it's worth just getting the "specialist" to fit?

So the real problem is lack of earth cable between engine and car..

[cjspindler]

I got home last night and had a look at where the guy was on about with the throttle.

It turns out, that he meant the throttle position potentiometer. The cable connection on this do look very dodgy to say the least, so i think it best to change this.

Does anyone know where i can just get the part from, without having to buy a whole throttle body? Also, how much would we be talking for this part?

I've read that there is a special set up required for this, so is this something i could do myself, or does it need a plug in device to re-set the max/min positions?

Cheers

[robi1000]

You don't want to change just the TPS. It's just not worth the hassle. Just buy the whole working TB and fit that.

[Wobba]

You don't want to change just the TPS. It's just not worth the hassle. Just buy the whole working TB and fit that.

Totally agree

[cjspindler]

I've now changed the complete throttle body with a different TPS. I've also done a voltage check to make sure the TPS is working correctly.

I took the car out, and it still has the misfire problem.

I thought i was going to crack it with this, but now i'm back to the drawing board.

Any more suggestions?