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Renault dTI advice

I've had a 99-'T' Laguna for nearly a year now......and have basically learned to suffer with it until I can find a cheap small diesel ( clio dCI /

206 HDI / Lupo TDI etc ). My wife & I use the car as a runner for work, so it basically does 90 miles a day of which ~60 miles are on the motorway ( a fraction under 20K per year and its currently got 149K on the odometer ).

Before I list my queries, I'll mention that it doesn't smoke to any noticeable degree on starting or accelerating, plus it doesn't consume/leak engine oil, infact compared to my Citroen 1.9TD it seems to keep its oil quite clean more like a petrol engine

  1. It was a dog to start over the winter months last year but that problem subsided when the ambients got milder....but its back with avengence now. Do these 'F9Q' engines have any common faults that result in poor starting such as temp sensors , fuel pre-heaters , bad pipes which allow air in etc etc ?

  1. Considering its supposed to be 100bhp, I've always found it a bit wimpy. Its always slugglish first thing and if someone cuts me up on a climb like at Brighouse and I loose my momentum, then its a stuggle to get it back.

  2. I used to have an AUDI 80-TDI 90 bhp which did the same journeys and that got ~5153 mpg, but this Laguna only seems to do 45-47. I could suffer the lower mpg if the payback was bags of power, but it feels marginally slower onsidering the different power margin.

  1. This weekend I've had a look around all its pipes/hoses to see if anything is split and everything looks okay. I revved the engine to see if the rod connected to the turbo gate valve moved and nothing appeared to happen. Should I be able to lever a bit of movement out of that ?

  2. I've found a site on the net for a place who specialise in diesels..called dieselbob.co.uk, but its a bit of a distance as they are somewhere like Preston. Is there anyone in SE Lancs / W.Yorks reading this post who could recommend a specialist would could diagnose if its injectors , timing , breathing , electonics.

Any help would be most appreciated

Reply to
Hoodat
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Does it have a MAF (Mass Air Flow) sensor ?

If so, then I had similar probs (on a different make of car), and replacing the MAF fixed it. The garage couldn't tell if it was the turbo, or the MAF so went with the MAF as the cheapest first !!

Graham

Reply to
Graham

consume/leak

From the starting and running problems, and lack of urgency, as well as the poor mpg, it sounds like its underfuelling, or running in limp home mode- I cant quite remmeber the method of fuelling control on this engine...?

Certainly sounds as though there is no cold start timing advance as there should be (assuming the glow plugs are glowing and for the right time) for starters. Also the lack of smoke too as these engines usually are quite smokey, but pull well. Its the same motor (more or less) as in a R19 DT which always were abit dirty and rough but went well. These were totally mechanically injected though.

Revving the engine in neutral is very unlikely to generate enough boost to require the wastegate to open, you need it under load with a decent boost gauge connected. My guess is you'll find it reading low due to the insufficient fuelling.

Tim..

Reply to
Tim (Remove NOSPAM.

There's no lights on the dash to suggest limp-home. Its reasonably driveable....just it feels like Renault made it on a Friday afternoon and ran out of turbos that morning !. The fueling is direct injection but not common rail. How the air is monitored in relation to the amount of fueling is a mystery to me

My Synergie TD does have a surge feeling when accelerating and thats

1750kilos with only 92bhp. That does smoke when its pushed !. This Laguna NEVER starts at the first turn of the key like my Synergie ( and my Audi TDI used to ). It can take two or three cranks, but with no smoking so I've always assumed its becuase the fuel isn't getting the right place at the right pressure.

Yeah but should I be able to get a pair of plyers on the stem shaft ( engine not running of course ! ) and get a few mils axial movement ? I once got some advice off dieselbob.co.uk during spring/summer and he said the Renault dTI pumps are sensitive to the timing. I just didn't want to get into a situation where I'm throwing megabucks at the car and getting nothing back for it. If I could trust that someone could put it on a rig or have a poke around and point out precisely whats wrong with it, then I'd gladly pay fair money.

( As an parallel example of another fault on this car, the aircon was dead so I took it to a specialist who hooked it up for free and concluded the condenser had perished. They quoted me £330 for fitting a new one plus re-charging the system. I waited a few months and found a branny condenser on Ebay for £75....paid a bloke £30 to fit ...and paid an aircon bloke £75 to check & re-charge..total £180. The point I'm making is I'd like to be able to get an accurate diagnosis of whats wrong with the car and then have control over how I go about fixing it )

Just going from above though, it does look it would be worth driving the

50odd miles to see dieselbob.co.uk and getting its fault codes / timing checked over.
Reply to
Ebodscki

For what it's worth I have just got parted company with a '99 1.9dti and mine ran exactly as you describe but it did start first touch in the winter. I have replave it with a 2000 Toyota rated at 84bhp and it feels like a sports car in comparison with the Laguna.

Pete

Reply to
Pete

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