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LT1 Diesel 'Misfire'.

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saljo View Drop Down
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Joined: 11 Jul 16
Location: Bristol
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    Posted: 14 Aug 19 at 19:26
Hi,

Here's a real head scratcher.

The vehicle, a camper, has the D24 2.4 6 cyl non turbo diesel.
184,000 miles and used with care over the past 24 years of our
ownership. Annual oil/filter changes and fuel filter changes. No veg
oil ever used. Slow warm ups before using higher revs.

Symptoms: Engine ran smoothly at low revs, up to around 35mph in top &
from 40 + also smooth. Runs rough between 35mph & 40mph, just
like a misfire on a petrol engine. Same symptoms for similar revs
in the lower gears, so its rev rather than speed related pointing to
an engine issue. Particularly noticeable when you hit the 'bad' spot going up hill.
No smoke when warm. Symptoms came on over a two day period around 6 months ago but haven't got any worse in the last 2,000 miles.

Performance, such as it is, is about the same as ever and MPG again
pretty much the same at 27mpg. Engine sounds ok when running smooth.
ie, no nasty noises. Same when 'misfiring'.

What have we done so far?

- Injector pump changed for recon unit with 12 month guarantee.
- Injector nozzles professionally cleaned.
- Injection pump timing checked as ok.
- Fuel filter changed.
- Fuel system bled several times, no sign of bubbles in the
supply pipe to the injection pump.
- Vehicle run from separate fuel supply to eliminate any fuel
pipe issues.

Local diesel expert (well thought of) is mystified and we were getting
poorer by the day!

Now for the really wierd bit. Took it in for an MoT last week and it passed with no emission probs, went for a 20 mile run and all the misfire/vibration had gone!!! Engine completely smooth right through the rev range. First time I've ever known an engine problem put itself right - or has it?

If anyone has come across similar symptoms and has any ideas as to
the cause, I'd love to hear.

saljo - newby.
saljo
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