What is life like with your car? Let us know and win £500 in John Lewis vouchers | No thanks
Engine juddering
I have a Renault Laguna 1.9 dCi on a 53-plate. It has been well looked after, but recently it started juddering. I got it onto diagnostics and it came back with three errors: heater plugs, MAF sensor and EGR valve. I've bought new parts and replaced, then had the codes done. I took it for a spin, but it's still juddering. No other error codes come up. Some auto technician said to try the MAP sensor, but they're another £200-£300.
Asked on 14 January 2011 by Bobby
Answered by
Alan Ross
When you say juddering, I take it that the engine is either missfiring or running rough?
Given what you have already done and that you want to reduce the expenditure, I would suggest that you look at the least expensive areas:
1.Check your air filter to make sure that it is not clogged up.
2.Check for split vacuum hoses/pipes.
3.Check for split intercooler turbo hoses
4.Check the cam/crank sensor to see if its loose/cracked or damaged, if unsure
It might be worth replacing (not too expensive)
You don't say how many miles your car has done, but would also suggest that you check around the injectors, to see if there is a chuffing sound when the engine is running, also if "black tar" can be seen around the injectors. If so you may have injector "blow by" which is when the injector does not seal against the injector seat in the cylinder head.If this is so then you will need to get it sorted asap.
Given what you have already done and that you want to reduce the expenditure, I would suggest that you look at the least expensive areas:
1.Check your air filter to make sure that it is not clogged up.
2.Check for split vacuum hoses/pipes.
3.Check for split intercooler turbo hoses
4.Check the cam/crank sensor to see if its loose/cracked or damaged, if unsure
It might be worth replacing (not too expensive)
You don't say how many miles your car has done, but would also suggest that you check around the injectors, to see if there is a chuffing sound when the engine is running, also if "black tar" can be seen around the injectors. If so you may have injector "blow by" which is when the injector does not seal against the injector seat in the cylinder head.If this is so then you will need to get it sorted asap.
Tags:
technical issues
engine
Looking for a garage you can trust? Honest John's Good Garage Guide has thousands of reader recommended garages, plus how-to guides and tips on servicing.
The Good Garage GuideSimilar questions
I had the same problem as most people do with a puff of white smoke after engine got a little warm and then it went away. I searched online and found out I need to remove the dpf, whenIi got this done,...
I have problems with the engine on my Ford Tourneo. When I slow down to stop, the engine will cut out. Had a new fuel filter fitted, but after a week started to cut out again. Ford tourneo is a 10 plate...
When I decelerate or down-shift when approaching lights or turning a corner, the car surges. I've been told by the service department at a Nissan garage that this is normal. Is it?
Elsewhere on 
.jpg)
