Chrysler grand voyager 2004 2.8 CRD – engine cut-out when ac

Ask for and share advice on using the PicoScope kit to fix vehicles here.

Re: Chrysler grand voyager 2004 2.8 CRD – engine cut-out whe

Postby STC » Tue Aug 22, 2017 10:58 pm

I read somewhere that the reason the ECM cuts the engine is because it reads the low rail pressure and and knows that given the injector "fueling rate" it has set, the fuel pressure is out of tolerance (i.e there is insufficient fuel pressure to inject the right amount of fuel under this level of demand) Is this why the ECM shuts the engine down without posting a fault code or just folk law?


I need to be careful what I say here because there is always an odd one out there. I have yet to see a Low Pressure fault that has not set a Fault Code. There is a minimum pressure requirement 180 - 300 bar generally dependant on car before the injectors will be fired - Little chance of the fuel atomising / vapourising for efficient combustion below that.

On my old 2001 voyager I ran out of fuel a few times and the ECM always posted a low fuel pressure error that eventually disappeared after ten restarts (or so)


Another guess - Possibly took that time to evacuate the air in the system.

Allegedly the Bosch specialists in Luton have removed and tested the fuel injectors (union street autos). Although I'm 50/50 as to whether they actually removed the injectors or not, because the uniform colour of the dust/oil all across the rocker cover would suggest no one had used a puller or touched the engine casing.


I took mine out of the VAG, Took it there nand watched them test it and OK it. Then reluctantly bought a recon from them, they gave me the wrong copper washers (too thick), told me I didn't need to replace the securing bolt. Off to TPS bought the correct washers and new bolt. Nailed it all back together and fixed the car. One happy taxi driver, Singing £5.50 - £5.50 - £5.50 all night till the banks open :D :D :D :D

I'm wondering if the fuel pump has a seal problem?

That is easy - Stop Wondering and test it properly !!! Load it Up, Stress it !!! Land one square on its chin and look to see if its knees so much as twitch.

or if it has been run on petrol/diesel mix. What are the symptoms of a pump that has been run on petrol/diesel?


It will be slow to build pressure, extended cranking to start, leaking fuel internally, externally or both, then it will die. Unless of course the Injectors throw the towel in first. Then it may live to ruin another set of injectors. All that could take minutes or months.

Nearly all the fuel that is run through the HP Pump and sent back to the tank via the return line is used for Lubricating and Cooling the HP Pump. Some systems have a fuel flow rate of several Litres per minute. Only a small percentage is diverted into the rail and subsequently fired into the chamber.

Petrol will wash away the lubricant in the pump and injectors so the moving metallic parts can grind to the groove. It like running an engine with Brake Cleaner in the sump instead of Engine Oil. It will kill the pump, your injectors will become Very Expensive Swarf Filters and you will NEVER ever get the remnants of swarf out of the Common Rail(s), the Pressure Sensor, some bits of pipework or the tank. It's ruined !!!

You might as well have poured Iron Filings in the tank !!! Iron filings are cheaper than petrol.
Last edited by STC on Wed Aug 23, 2017 9:22 am, edited 3 times in total.
User avatar
STC
TwoWaves
TwoWaves
 
Posts: 790
Joined: Sun Sep 13, 2015 4:10 am

Re: Chrysler grand voyager 2004 2.8 CRD – engine cut-out whe

Postby STC » Tue Aug 22, 2017 11:19 pm

Liviu

Which software engineer would prefer, safety wise, to shut an engine down due to low fuel pressure instead of going in emergency mode low power. I tell you, none! Forget about it.


Short answer - Land Rover - Jaguar Engineer

Long Answer - Fault Code - P115B - Low Fuel Level - Forced Engine Shutdown.

A broken Tank level Sender Wire in the tank is what I found in this car !!! That should not be a hanging offence ?? Tank was full so not a nice job when you have to quit smoking to earn an honest wage and help a fellow human - Where are my human rights ???

It doesn't even stop on low oil pressure, to give you the chance to survive and pull over ...

An 18 year old 1999 Rover 820 - 2.0l Petrol will shut down / refuse to start with Oil Pressure below threshold. Nothing new there
User avatar
STC
TwoWaves
TwoWaves
 
Posts: 790
Joined: Sun Sep 13, 2015 4:10 am

Re: Chrysler grand voyager 2004 2.8 CRD – engine cut-out whe

Postby liviu2004 » Wed Aug 23, 2017 7:38 am

If that is the case, I swallow my words back.

What a poor piece of engineering you have there. You deserve your human rights back and they for sure deserve to be brought to justice. :roll:
liviu2004
OneWave
OneWave
 
Posts: 46
Joined: Sat Mar 19, 2016 10:23 am
Location: Netherlands

Re: Chrysler grand voyager 2004 2.8 CRD – engine cut-out whe

Postby STC » Wed Aug 23, 2017 8:45 am

Liviu

If that is the case, I swallow my words back.


Take a look at this topic16381.html

The fact is that I would not have believed these strategies either except for the fact that I have witnessed them with my own eyes..

A Faulty Exhaust Gas Temp Sensor will kill the engine dead in its tracks on some new cars. Even in the fast lane of a Motorway. Madness in a so called civilised society ?
User avatar
STC
TwoWaves
TwoWaves
 
Posts: 790
Joined: Sun Sep 13, 2015 4:10 am

Previous

Return to Diagnostic discussion

Who is online

Users browsing this forum: No registered users and 0 guests