Rover 45 TD engine jerky when cold

DIYspanner · 6 Oct 2015

Happens when driving along at steady speed. If I dip the clutch and rev, the engine revs no bother.

Changed the back two sections of the exhaust and fitted a Mann diesel filter last week but still have the problem.

Perhaps fuel starvation somewhere or perhaps an injector problem which I'm told are electronically controlled.

Opinions please.

Burnerman · 6 Oct 2015

Does it behave better when the engine is warm, and what happens if the engine is under load i.e going uphill?
John

DIYspanner · 6 Oct 2015

Seems only to be when cold.

Seems fine going up a hill when warmed up.

Burnerman · 6 Oct 2015

When you first start up......does the engine misfire? If it does, try working the diesel primer bulb or pump when the motor is running - just in case it is ingesting air from somewhere.
John

DIYspanner · 9 Oct 2015

Seems to tick over no bother when cold.

Only jerky when under steady speed while cold and starts after about 1/2 mile.

Once warmed up, seems smooth.

DIYspanner · 16 Nov 2015

Definitely only jerky when cold driving along - once warmed up, the engine is smooth.

Either an air leak or a faulty sensor feeding the ecu duff information when the engine is cold ?

Burnerman · 16 Nov 2015

A difficult one, but diesels don't suffer from cold running problems that petrols used to.....I'd still be looking for air being ingested into the fuel supply to the injection pump and the area around the fuel primer / filter is a chief suspect.
John

DIYspanner · 16 Nov 2015

I'll start with the new fuel filter I fitted recently and put new jubilees on the spout pipes.

A bit of air in perhaps equates to a bit of diesel out so look for a damp patch of diesel ?

Burnerman · 16 Nov 2015

Sadly, life isn't that simple.....the system is under negative pressure so it can suck air in......without letting any fuel out!

Give us a photo of the fuel filter / primer if you can.
John

DIYspanner · 19 Nov 2015

Definitely air.

I loosed the filter bleeder and pump about six times to get diesel flowing out. Just need to find where the air is getting in.

Here's the filter -

Burnerman · 19 Nov 2015

That type of filter isn't prone to letting air in, but if those jubilee clips are a bit big they can squash the fuel pipes oval a bit......I don't like those squeeze clips either, so consider smaller jubilee (000 size) or some other type.
Can we see what priming mechanism your car has?
How easy is it to see the fuel tank outlets......maybe under the rear seat squab?
John

DIYspanner · 19 Nov 2015

Yes, I'll certainly get the smaller jubilees since they are a bit too big -

The primer for the system is just the rubber bulb next to the filter -

Burnerman · 19 Nov 2015

Those bulbs incorporate a one way valve that prevents fuel returning to the tank overnight......this usually gives a delayed start up rather than a misfire, but faults aren't unknown.
John

DIYspanner · 6 Jul 2016

After months of not finding anything amiss, there's now a damp patch on the diesel tank which seems to be from above.

So I suppose the rear seat is to take out to gain access to the pipe connections where I'm assuming the leak and air ingress is.

Burnerman · 6 Jul 2016

Guaranteed. ....the steel pipes that exit the sender unit will have corroded through. As well as the diesel leak, that's where the air ingress will be.
John ☺

Rover 45 TD engine jerky when cold

Similar threads