Difficult cold start on C5 X7 2.0HDi

Lacrosse · Unread post by **Lacrosse** » 31 Jan 2022, 08:01

vincentfishing wrote: 30 Jan 2022, 21:40 one thing that wasnt on your list of new replacements was fuel pressure sensor, you changed everything else but not this, presume it has one?

True, but since it shows me the pressure on the rail I assumed it is ok.

Hell Razor5543 · Unread post by **Hell Razor5543** » 31 Jan 2022, 08:09

Does this engine have a fuel pressure regulator? I know that members have had issues with them on older cars, and replacing them has often resolved the issues.

Lacrosse · Unread post by **Lacrosse** » 31 Jan 2022, 09:16

So, no help from easy start spray.
Starting to wonder that the problem is not from the fuel and injection system...or?

Lacrosse · Unread post by **Lacrosse** » 31 Jan 2022, 09:19

Hell Razor5543 wrote: 31 Jan 2022, 08:09 Does this engine have a fuel pressure regulator? I know that members have had issues with them on older cars, and replacing them has often resolved the issues.

Yes, it has.

Lacrosse wrote: 20 Jan 2022, 00:21 At this point:
- Repalced all injectors with brand new ones (Delphi)
- Replaced MAF with brand new one (Pierburg)
- Replaced battery with brand new one (Varta)
- Replaced all glow plugs with brand new (although the old ones were functional)
- Replaced fuel pressure regulator new OEM
- Replaced EGR with brand new one OEM
- Replaced Camshaft sensor with brand new one (Valeo)
- Measured compression on every cylinder - No problem here / Oil level does not change
- Doing all the above didn't change anything about my problem

vincentfishing · Unread post by **vincentfishing** » 31 Jan 2022, 09:36

Lacrosse wrote:So, no help from easy start spray.
Starting to wonder that the problem is not from the fuel and injection system...or?

would suggest you have a problem with your air intake, easy start has nothing to do with fuel or injection

Lacrosse · Unread post by **Lacrosse** » 01 Feb 2022, 08:30

Starting to wonder if it isn't this the case:
viewtopic.php?t=60717

To much black oily goo in the inlet, an as it cools down in cold weather and overnight, its hardening and blocking the air intake...Any thoughts on this?

vincentfishing · Unread post by **vincentfishing** » 01 Feb 2022, 11:00

when you have bad build up of 'goo' in inlet(will also be in egr) and pipes it will cause loads of black smoke under accelleration(not white smoke)

vincentfishing · Unread post by **vincentfishing** » 01 Feb 2022, 11:09

this was a the state a car i bought was in before iremoved inlet /egr/swirl flaps etc, a right mess and masses of black smoke, no smoke after a few days of cleaning
https://forums.mbclub.co.uk/attachments ... jpg.90964/

Unread post by **Paul-R** » 01 Feb 2022, 11:36

That forum requires you to login (and hence be a member) to view.

vincentfishing · Unread post by **vincentfishing** » 01 Feb 2022, 20:22

Unread post by **myglaren** » 01 Feb 2022, 21:22

You will need to download that image to your computer then upload here.

There is a guide to uploading here.

We can't just follow the link either as it requires a log in (membership) to the site.

Lacrosse · Unread post by **Lacrosse** » 02 Feb 2022, 15:40

I ordered a new intake manifold. We'll see if that helps...

Unread post by **Steve Walsh** » 02 Feb 2022, 15:45

Might be worth disconnecting exhaust on engine side of DPF and giving it a try before hitting it with more parts

Unread post by **TanT** » 29 Nov 2022, 19:23

I don't see anything here about coding in the new injectors or any electronic parts that you changed. Your ECU gets confused with replacement parts unless you tell it there has been a change the car may not start. Lexia and diagbox are cheap on ebay and better investment than guessing which part to buy next.

If you spray easy start and the car does not fire then you may have a mechanical failure such as timing. diesel engines burn almost any flammable substance thrown into it even when electrics are not working.

Good luck to anyone with similar problem!

Lacrosse · Unread post by **Lacrosse** » 12 Nov 2023, 01:34

TanT wrote: 29 Nov 2022, 19:23 I don't see anything here about coding in the new injectors or any electronic parts that you changed. Your ECU gets confused with replacement parts unless you tell it there has been a change the car may not start. Lexia and diagbox are cheap on ebay and better investment than guessing which part to buy next.

If you spray easy start and the car does not fire then you may have a mechanical failure such as timing. diesel engines burn almost any flammable substance thrown into it even when electrics are not working.

Good luck to anyone with similar problem!

Problem still not solved...

Injectors were coded to car, and any part that needed coding to car was done with Lexia/DiagBox.
Problem occurs after car sits overnight or more than 5-6 hours unstarted.
Car runs fine AFTER FIRST cold start. Car starts instantly in the rest of the day.
Problem worsens when cold/icy weather comes and viceversa

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Difficult cold start on C5 X7 2.0HDi

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