All has been well until today when pulling off motorway I noticed the engine stuttering.
On coming home there appears to be no power coupled with hesitation, changing down gears doesn't help, only managed 60 on the flat, stuttering, 70 down hill, no stuttering.
The only previous experience was symptoms like this was a cracked distributor cap on an old cortina.
The Clio engine will stall once stationary or coasting but will immediately start on the key
I've cleaned the plugs which looked normal based on Haynes pictures. this resulted in the car maintaining it's idle, although it was rough. Changed the HT leads as they were the originals, no better or worse, same rough idle and no power.
Any ideas, I'm thinking fuel filter next, air filter was done a couple of months ago. Up until now the car was running well easy 55mpg, no smoke etc.
Checked for a spark at cylinder 1, gear box side of engine - NO SPARK
Put spark plug from cylinder 1 in cylinder 4 HT lead - YES SPARK
Put cylinder 4 HT lead at coil pack connection on number 1 coil pack connection - NO SPARK.
In Haynes it shows my car as having a DSI (Direct Ignition Module), is this also called a coil pack and am I right in thinking this car therefore does not have distributor cap, rotor arm etc. The leads from the plugs only seem to go back to the DSI.
So, do I need an new DSI or is there anything I can check before I do that?
If only one end of a coilpack pair [cyls 1 + 4] is firing, it's the coilpack. [DIS in Haynes-speak.]
1 and 4 fire together [wasted spark system] so if you swap HT leads 1 and 4 on the coilpack [turn it off first - if you must.....] then the miss will move to 4; proving that one outlet from the DIS is faulty. [The internal resistors burn out.]
Thanks for the help, the replacement coil pack seems to have done the trick, it's still a little stuttery when picking up in second, maybe a bit of damp, if it continues I'll put the original HT leads back on as the replacements were non Renault.