Another thing, bit more recent.

Had injector problems for past few months. Went to Dorset for the weekend last week and spluttered all the way.

Has been better since I got back - have done the usual injector cleaner additives, sitting at edge of clifftop revving the engine for a few mins and let all the smoke go out to sea...

Splutters to about 2000 rpm, sometimes 2500 then clears and goes like bat out of hell! Is it the pump, the injectors or the timing. Local dealer has checked and said all 3 are fine, as I don't tinker with injector systems much I can't see if I'm being conned.

I know the injector pumps on these are a bit :pants:. If I need to change it or adjust the timing what are the settings?

A misfire on a diesel makes me think of an air leak between the pump and the injectors. Petroleum jelly and washing up liquid time I'm afraid. That or take the car to a Bosch or Turner diesel place.

it's a lucas pump on those, if there was an air leak you would have trouble starting it,

i would try changing the throttle position sensor before anything else

If there was a leak between pump and injectors, there would be a puddle! Get some one to plug in a scanner and check for any faults

Tom, I said Bosch because they're diesel specialists, not because I thought the car had a Bosch pump!

If there was a leak between pump and injectors, there would be a puddle! Get some one to plug in a scanner and check for any faults

Been to Skoda dealer about this a few times, been plugged into their computer and it shows no fault.

ok i'm going to take a wack out of this, but i dont own a diesel engine... just know the basics.

Diesel needs to burn in order to expand, but it does not do this like gasoline (petrol), instead of a spark to ignite/burn/heat the mix of air and fuel it relies on compression, compression equals heat, heat equals combustion and therefore expansion wich runs the engine, that being said...

if there are no error codes it must mean that you are loosing compression due to not having a good seal, if your engine got too hot in the past, this could be the seal from the top of the engine (where the valves are)

if not and the engines has not had its pistons check or the piston rings replaced might be the time for it,

if not, that means that you have sticky valves and have to check the springs, but to me the most probable cause is the most simple....

Sometimes air filters get too cloged and some of the filtering element gets into the engine, it burns and get stuck in the valves or maybe the filter (air) had a little hole at any rate, try spraying some carb cleaner on the manifold or any other cleaner that you can use for deasel, and rev the engine high, so that the explosion vibration and presure cleans out the debry, if i hit the nose whats going to happen is that your gona fell a big jerk and afterward good engine idle...

realy hopes it helps, if not sorry dude...

Full a history as I have - New engine at 60,000 miles as previous owner killed original. Injector pump also new at time. Has done 32,000 miles since, servicing every 5-6000.

Have had head off myself - all valves are ok as springs checked, tappets set and valves lapped in.

There are no fuel leaks, or signs of blown head gasket. Does not overheat, hasn't done since I've had it.

I think it's the pump or the injector timing myself. Does anyone know what the timing figures are so I can get it set?

You can't normally alter a deisel pump timing just make sure its set up spot on when fitting the timing belt not sure if this engine uses a vernier pulley on the pump but if it does use your timing pins and relax the bolts on the vernier so the pump timing doesn't get altered when you set the belt tension and pull the pins out. Follow the manual for setting up and you can't go wrong. Hope this helps

By the way does it have a regular misfire on idle or does it just run rough up to 2-3000 rom. If a regular one you can slacken the injector pipe on each cylinder in turn whilst running until you find the one that doesn't alter the running, thats the one misfiring,Be prepared for a bit of mess, you don't need to open the pipe for long just a couple of secs to hear engine note change. and you only need to slacken pipe not disconnect completely. Do a compression check if its okay youv'e probably got a worn or knackard injector.

Got to admit i'm surmising that its not a high pressure common rail system or unit injectors if it is the above doesnot apply never open the pipe on these later systems. I'm sure some one on here will know exactly what system you have:thumbup:

Fellies are too old to be common rail or unit injector engines, aren't they?

yeah, they have a classic rotary distribution pump, feeding indirect via individual pipes

You can't normally alter a deisel pump timing just make sure its set up spot on when fitting the timing belt.

By the way does it have a regular misfire on idle or does it just run rough up to 2-3000 rom.

A) injector pump has been checked for timing by local skoda dealer, by independent garages AND diesel specialist. They've all said that there is nothing wrong with pump and is at correct timing. The injectors would have been replaced if they were knackered.

The misfire doesn't happen at idle, only at speeds over 1500 rpm, 2000-2500 being the most common. There's no excessive exhaust smoke, no leaks from the injector system, no leaks from manifolds etc.

All I can put it down to is a really bad flat spot (every car's got one - dad's astra was terrible for it!)

Perhaps you could attend one of the rolling road days that get organised on here.

The dyno results might make it a little clearer as to exactly when the problem occurs.

Plus if there's say 15 or 20 people there, one of them may have experienced a similar fault before.