How do you know when youbare running rich? Any test?

 

Possibly the P1130 code? Poor MPG might point to it too.
Thinking about it, when I was running a Passat on vegetable oil, I disconnected the coolant sensor so the glowplugs would come on no matter what the outside temperature was.

A simple test for the coolant sensor might be after your cars been running for a while and up to temp, the glowplug light stays on for a while when starting.

 

Most times wahtever causes a P1130 to be raised will also cause the engine to cut out, so I suspect that is a stored code.

I make that about 15mpg which is about half what I would expect from normal driving, what does the trip computer say the MPG is (expected is about 9l/100km) If this reflects the 15mpg then at least it means the ECU knows it's putting more fuel in.

Fuel leaks are unlikely, but possible. As fuel is sucked up from the tank leaks will tend be drawing air in rather than letting fuel out and leaks beyond the high pressure pump will tend to drop the rail pressure so it won't run.

I'd start with a proper scan of fault codes and then leak back test on the injectors. Followed by looking at the live data from the MAF, fuel pressure and injector times.

Regards
Ricahrd

 

This is a point here that if the Lambda sensor on a P1130 brings up an air/fuel to rich or too lean the instant response would be to run along and buy a new one. Wonder how many people have been caught out. It tells us in a way that something else needs sorted.

 

on a petrol 1130 is lambda, on a diesel 1130 is fuel rail pressure . These diesels don't have a lambda sensor

Regards
Richard

 

Here I'm dreaming again...Was that Mopar codes sight P1130 Oxygen sensor...Got it mixed up again. Start again..

 

Yeh sounds right about the stored code Richard. Was looking into EGR faults, this would give lack of performance and black smoke which is not an issue though. But it would Increase the fuel consumption. Scotsman's coolant sensor sounds right and I take it that little more fuel wouldn't produce black smoke.

 

The other person told me that possibly fuel pump presure sensor need to be replaced.How this sound to you guys?Thx

 

I know on a Lexus the engine temp sensor is very important (different from the temp gauge sensor) IF the ECU thinks the engine is cold, it overfuels

 

Common symptoms of Fuel pressure sensor failure are cutting out, difficult to start, rough erratic running etc. If the sensor is faulty you will get an error code indicating this when you do a scan on the engine. - See more at: Fuel pressure sensor | common rail diesel | Bosch Delphi Siemens | Diesel Injectors UK

The coolant temp sensors a long shot, but should be an easy test. Drive somewhere you're going anyway, switch it off, ignition back on and how long does the glow plug light stay on for? If it's longer than a second or 2, I'd say it's faulty.