idle

metgreentd · Post by **metgreentd** » 11 Apr 2007, 23:15

forgot to ask this my engine (1.9 td) ticks over a bit lumpy the idle speed is ok and it drives smoothly its just when idling it seems a bit rough any ideas thanks

jeremy · Post by **jeremy** » 11 Apr 2007, 23:52

Air in the fuel? Leakoff pipes - with a Bosch pump only (Roto-Diesels just leak and smell)

Once its been running for a minute or so the glowplugs can be ignored.

Bit more info would be helpful - age, engine, car.

metgreentd · Post by **metgreentd** » 12 Apr 2007, 00:17

sorry car is a 95 on a m plate 1.9 td xantia 155.000 miles. i presume it's bosch there is no smell of diesel or visible leaks at the pump as you suggest.this rough idle happens at all engine temps regardless of how long the engines been running

Post by **Peter.N.** » 15 Apr 2007, 17:57

Could be down on compression on one cylinder due to wear or incorrect valve clearances or could be that the injector pressures are unbalanced, but unless the engine is leaping out of the car, or there are any other symptoms, I wouldn't worry about it. You could end up with a lot of work!

jeremy · Post by **jeremy** » 15 Apr 2007, 19:20

The point I'm making is that on a car fitted with a Bosch pump hard/cracked leakoff pipes will allow air to get into the fuel system and may cause misfiring, even if there is no external diesel leak. Roto-Diesel pumps are rather different and are unaffected by the state of the leakoff pipes - and indeed a couple of times I've had major leaks (one split pipe and one failed end cap) on our ZX 1.9D with a Roto-Diesel pump and the only indication that something was wrong was the smell of diesel.

Stewart(oily) · Post by **Stewart(oily)** » 16 Apr 2007, 14:39

I just found and repaired a split leakoff pipe on the BX (Bosch pump) symptoms were smoking and spluttering at startup, then increasingly difficult starting, eventually failing altogether, and a serious lack of power which I only found after fixing it

Stewart

metgreentd · Post by **metgreentd** » 25 Apr 2007, 21:14

ok seems the general feeling is leak off pipes.the pump is bosch my next question is where are the leak off pipes?are they the ones that go from injector to injector?thanks guys

steelcityuk · Post by **steelcityuk** » 25 Apr 2007, 23:13

Yes they are.

If the engine has a EGR valve that could be the cause of the problem.

Steve.