300tdi slow start and rough idle

Ke70_Styl · Feb 15, 2019

Hello people,

I am having some problems with my 300tdi disco 1 manual. As it seems the car has always trouble starting and cranking takes at least 10 seconds but always starts. It doesnt matter if it is a cold start or not. Moreover, my idle doesnt want to stay stable. After driving in the motorway for a couple of miles, the car idles at 1250 but when i am driving in trafic it idles at 900 and random "cuts" happen. Sometimes when starting from cold if i give it some revs the engine stalls. Generaly i have no power loss when crusing and and no speed drop when going uphill even with 5th gear.

So far have cleaned the lift pump "filter", changed the fuel filter, change the air filter and looked for leaks. I am suspecting that there is a problem delivering fuel in the injectors because if i prime the lift pump by hand the car starts way faster. I am pretty sure there in no air in the system as i have bled it multiple times.

My first guess is to change the lift pump but i would like a second opinion.

TIA

Kev12 · Feb 15, 2019

Could be air, try replacing leak off pipes first and using a bit of clear pipe from IP to look for bubbles. A new good quality lift pump is always a good idea fro what they cost

Ke70_Styl · Feb 15, 2019

Kev12 said:
Could be air, try replacing leak off pipes first and using a bit of clear pipe from IP to look for bubbles. A new good quality lift pump is always a good idea fro what they cost

Already done that mate. Sorry I forgot to mention. I have put clear pipe in the most distant one but I can't see any air bubbles

Kev12 · Feb 15, 2019

Did you try a bit of clear from FIP to first injector? Could also try unscrewing the filter to check its full

Ke70_Styl · Feb 15, 2019

Nope I didn't try that. If there is air there what should I do? You

Disco1BFG · Feb 15, 2019

Air is no use - it's getting in somewhere - possibly the spill pipes, or possibly the outlet from the tank under the boot floor - the steel pipes here have a reputation for rotting away ... as does the sedimenter - it's alloy, and if not maintained, the water in it can rot it from the inside out ....

If the fuel filter isn't full, then it's more often than not the LP which is kaput...

Ke70_Styl · Feb 15, 2019

Disco1BFG said:
Air is no use - it's getting in somewhere - possibly the spill pipes, or possibly the outlet from the tank under the boot floor - the steel pipes here have a reputation for rotting away ... as does the sedimenter - it's alloy, and if not maintained, the water in it can rot it from the inside out ....

If the fuel filter isn't full, then it's more often than not the LP which is kaput...

Hmm I am quite new to this so my knowledge is limited. Maybe I should first get a new lift pump as they are cheap and if it's not fixed I should run some pressurized air from the fuel tank to check for any cracks. Am I correct?

Blackburn · Feb 16, 2019

Kev12 where do you buy clear pipe that will take the pressure from the FIP to the injector?

Ke70_Styl · Feb 16, 2019

Blackburn said:
Kev12 where do you buy clear pipe that will take the pressure from the FIP to the injector?

I used some spare we had in the university mate but I guess if you find any specialist tool shop you can ask them. They might not have it but they will probably know where to get some.

Ke70_Styl · Feb 16, 2019

Blackburn said:
Kev12 where do you buy clear pipe that will take the pressure from the FIP to the injector?

I used some spare we had in the university mate but I guess if you find any specialist tool shop you can ask them. They might not have it but they will probably know where to get some.

Kev12 · Feb 16, 2019

Blackburn said:
Kev12 where do you buy clear pipe that will take the pressure from the FIP to the injector?

Well spotted, please ignore that

I was thinking either side of the lift pump

EeEk · Feb 16, 2019

if theres air in the fuel ...it gets in between the tank and the lift pump.....everywhere else it leaks out

sick the clear pipe between the lift pump and the filter

Ke70_Styl · Feb 16, 2019

EeEk said:
if theres air in the fuel ...it gets in between the tank and the lift pump.....everywhere else it leaks out

sick the clear pipe between the lift pump and the filter

Hmmm ok. I will need to do that

Disco1BFG · Feb 17, 2019

Ke70_Styl said:
Hmm I am quite new to this so my knowledge is limited. Maybe I should first get a new lift pump as they are cheap and if it's not fixed I should run some pressurized air from the fuel tank to check for any cracks. Am I correct?

I'd do the clear pipe mod first, then have a look at the sender unit in the top of the tank - I.E. check it for corrosion ....

( sender unit is ESR1223G )

Viz:-

https://www.paddockspares.com/esr1223g-fuel-pump-and-sender-unit-diesel-from-ka065557-oem.html

A lift pump is always worth having as a spare .... Buy a good one though - Delphi, for example. ( ERR5057D - £22 ish )

Ke70_Styl · Feb 19, 2019

Disco1BFG said:
I'd do the clear pipe mod first, then have a look at the sender unit in the top of the tank - I.E. check it for corrosion ....

( sender unit is ESR1223G )

Viz:-

https://www.paddockspares.com/esr1223g-fuel-pump-and-sender-unit-diesel-from-ka065557-oem.html

A lift pump is always worth having as a spare .... Buy a good one though - Delphi, for example. ( ERR5057D - £22 ish )

Thank you mate.

hopefully I will investigate more during the weekend.

ozzyboydeano · Feb 20, 2019

Ke70_Styl said:
Thank you mate. hopefully I will investigate more during the weekend.

you can bypass the lift pump and leave it in place... an install a facet electric pump or any other cheap inline delivery fuel pump

Ke70_Styl · Feb 23, 2019

As it seems still i was not able to address the problem yet. The sedimenter is bypassed though so there should by no leaks from the tank to the engine. I have ordered a Delphi lift pump and hopefully I will have it by Wednesday. If that doesn't fix the problem I will clean the ve pump and check the timing.

Ke70_Styl · Feb 23, 2019

Change of plans as it gets worse. I have undone the bleeding nipple from fuel filter and a lot of foam comes out. I guess I will change my fuel line from the tank to the lift pump and see how it goes.

Is it 10mm external and 8mm internal?

300tdi slow start and rough idle

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