TD5 Rough running at cold start

[crash]

When I go to start the Disco (270K)first thing in the morning it has a bit of a rough idle for a minute and then runs fine for the rest of the day. Warm up starts it does not do it, worse at colder temps.
This am tried to start had a rough idle then stopped, I could not restart it. No warning lights and cranks well, can hear fuel pump running, has fuel. Will retry when I get home and see what happens.
I do run injector cleaner through it on a semi regular basis.
1) will recheck to see if oil in loom
2) could a dirty MAF cause this - will clean and see.
3) injector problem?

[stallie]

Mine is doing the same (the brief rough running - about 5 seconds and worse when cold).

Research I have done on here suggests that could be the IAT sensor or more likely it could be a leaking copper ring on the injector.

I am having it looked at next week.

[OffTrack]

You could add these to the list of suspects:

- Fuel Temp sensor
- Coolant Sensor
- Crank Shaft Position sensor

The MAP/IAT is unlikely to cause starting issues.

[landiematt]

Could also be a faulty fuel injection leaking down after sitting for awhile. Over fueling for initial start-up.

[robbotd5]

Glow plug fault??
Regards
Robbo

[Psimpson7]

is there any excessive smoke of any colour when it runs rough?

[dinosaur]

I was always led to believe that the rough running on startup was due to the fact that the diesel only had 4 glowplugs and that it was the cold 5th cylinder 'rattling' around until it got its act together.

[stallie]

Mines only just started doing it. Didn't do it last winter.

[crash]

is there any excessive smoke of any colour when it runs rough?
Not that I have noticed.
Yesterday It failed to start after it quit - 1st time this happened.
Tried to restart but would just crank over.
This am - thinking maybe a fuel pump issue, I went through the process of a restart as if run out of fuel - had a bit of a rough start but had alot of black smoke for a couple of minutes but has been normal since.

[gusthedog]

My rough idle at intial start up was fixed by putting in a new injector harness. Im not sure about all the other stuff tho.....:o

[jwb]

and look for oil at the ECU plug and clean it out

[crash]

and look for oil at the ECU plug and clean it out
Done that, cleaned MAF, and IAT sensor as well. Last two cold starts seemed better, but will keep tabs on it.
It needs to go to the Dr for a couple of unrelated items, will ask them about this issue aswell.

[Franz]

Not that I have noticed.
Yesterday It failed to start after it quit - 1st time this happened.
Tried to restart but would just crank over.
This am - thinking maybe a fuel pump issue, I went through the process of a restart as if run out of fuel - had a bit of a rough start but had alot of black smoke for a couple of minutes but has been normal since.
After it cuts out, remove key, get out, lock the car, wait a few minutes and try again - not sure if it will help but give it a try.

[stallie]

Coincidence...

Got a call from the wife who'd backed out of the drive, then had it conk out....

Turns over but no fire.

I had a ignition harness I'd been meaning to replace, so replaced it. There was a lick of oil on just one probe at the ECU, so cleaned that.

Still no joy. Checked in here to see what to do next. Fuel purge here we come....

[stallie]

Woo hoo. Working and purring after a drive.

Upon further consideration curiouser and curiouser.

When I did the fuel purge, I thought I should be able to hear the fuel pump whirring, but couldn't. I even stuck my head under the wheel arch and no sound. The engine did start, and the car drove around the block. The absence of sound during the ignition I put down to getting used to the resonance of a Lucas TR6 fuel pump :)

Anyway 30 mins later, I started the car and could hear the fuel pump whirring away when on Ignition 3 and sticking my head under the arch, there's no way I missed that sound earlier.

Intermittent fuel pump? If itstopped working, would there be enough fuel in the engine after a start (car had been idle for 36 hours) to back down a 50 metre drive, stop at the letter box then reverse into the road before running rough then immediately cutting out?

[alpick]

Bet that feels good.

And you think the problem was?

Fuel?
Harness?

cheers

[stallie]

I'm starting to think that they may not have been related? The rough running On start may be independent of the fuel pump cutting out.

I'll know in the morning after she's been standing overnight.

[greif]

Woo hoo. Working and purring after a drive.

Upon further consideration curiouser and curiouser.

When I did the fuel purge, I thought I should be able to hear the fuel pump whirring, but couldn't. I even stuck my head under the wheel arch and no sound. The engine did start, and the car drove around the block. The absence of sound during the ignition I put down to getting used to the resonance of a Lucas TR6 fuel pump :)

Anyway 30 mins later, I started the car and could hear the fuel pump whirring away when on Ignition 3 and sticking my head under the arch, there's no way I missed that sound earlier.

Intermittent fuel pump? If itstopped working, would there be enough fuel in the engine after a start (car had been idle for 36 hours) to back down a 50 metre drive, stop at the letter box then reverse into the road before running rough then immediately cutting out?
-----------------------------------------------------------------
is as unlikely as this one sounds, I HAVE had a similar error on my father's car that turned out to be electric cables above the automatic transmission, which was short-circuited and hadde destroyed ECU box under the driver's seat (note the right-hand drive) I have pictures if you need but I do not know how to insert pictures on the forum send a pm so I will email them. Sincerely, / Anders Sweden

[stallie]

Tack så mycket Anders - mine's a manual, but I'll check all the wires anyway.

Good and bad news today though.

After a cold night, it started first kick and no roughness :)

But she conked out later in town. It's not related to the rough running at start, so I'll start another thread to stop drift.

[Franz]

Tack så mycket Anders - mine's a manual, but I'll check all the wires anyway.

Good and bad news today though.

After a cold night, it started first kick and no roughness :)

But she conked out later in town. It's not related to the rough running at start, so I'll start another thread to stop drift.
You should be able to clearly hear the fuel pump if you are standing next to the drivers door and turning the ignition key.

Pumps don't have to scream to be crook - when you can't hear them is generally a sign that they are not working properly.

Another thing to try when the engine cuts out - bang the bottom of the tank with a lump of wood or rubber mallet. You should then hear the pump whirring away and it should start.

Cheers,

Franz

[jwb]

I had a case where the car was difficult to start sporadically and then would conk out after some rough running and had a whining fuel pump. Pump replaced (twice), fuel filter mod done per some technical bulletin and finally injector seals done and it was all good from there. The techs simply worked their way forward from the fuel tank.

[stallie]

Ah - injector seals, leaking flooding engine when running?

Yesterday I put some dipstick oil and a dollop of new oil on a white piece of paper. Here ate the results. I'm pretty sure the motor oil has diesel in it. Plus the oil level went up a couple of mm...

It's booked in to have the copper washers done Monday week. Can't drive it till then anywat until the fuel pump turns up from the UK!

https://www.aulro.com/afvb/images/imported/2012/05/1460.jpg