Renault Scenic - Engines - 2.0 Petrol engine missfire - Renault Forums :: Independent Renault forum

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post #1 of 20 (permalink) Old 7th December 2005 Thread Starter
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Renault Scenic - Engines - 2.0 Petrol engine missfire

Hi Im John & I drive a 2004 Scenic 2.0 Privelege Plus and I have been having this problem on & off for the last two years. It only happens intermittently when the engine idles very roughly and you can "feel" the missfire through the seat....I have had it in to the dealer on 3 occasions and every time they tell me there is nothing wrong. On 2 out of the 3 visits, I have been handed back a damaged vehicle! In October last year they finally changed the coils after my repeatedly saying it was as if a spark plug was breaking down. Due to a problem I had today, I decided to explore Google and see what I could find on the subject. According to various posts I have found here and elsewhere, It appears that a batch of coils are faulty but I do not know whether they are Sagem or Denso as I cannot see the make. However, I can see the number 4-252 on the side of the coils . Can anybody tell if these are ok or suspect from the number given? Today it began to idle roughly & was running like the proverbial smacked A*se when I pulled into the supermarket. Ater about an hour or so when I came to go home it started ok initially and after about a mile, I noticed the warning light for exhaust emissions was on ( statically, not flashing ) and it was running extremely roughly. When I got home, I called my local dealer and arranged for it to be looked at the following day. I then rang Renault UK & explained the scenario regarding the multiple visits and no fault found etc and stated that I had no faith in the dealer and was in fact convinced that come tomorrow, I would be given back a damaged car with no engine faults discovered and be out of pocket to boot. To say they were less than helpful would be an understatement.

Having just started the car after 3 hours or so, the warning light is no longer on & although the engine is far from running smoothly, it is a lot better than it was. My dilemma now is whether to go ahead with the appointment tomorrow or keep my fingers crossed and cancel..if I go to the dealer, can anyone suggest the direction to point them in to remedy this problem??

Apologies to all for the length of my first post, any input would be greatly appreciated.....

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post #2 of 20 (permalink) Old 7th December 2005
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The coils in your vehicle should be Denso items, however if they were Sagem the date code of 4-252 (day 252 of 2004), so well within the 330-3 date..

I can only suggest some commonish issues with the 2.0

1: Clean the throttle body ..
2: Have the Injectors ultrasonically cleaned and tested
3: Have the Lambda sensor tested for correct operation..

When the vehicle is playing up is there any increase in Exhaust smoke etc?

EX Renault Dealer Technician & MOT Tester, Not a Monkey!
For as long as but one hundred of us remain alive, we will never on any condition submit to the domination of the English.....It is not for glory, nor riches, nor honours that we fight, but for freedom alone, which no good man gives up except with his life. Arbroath 1320
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post #3 of 20 (permalink) Old 8th December 2005 Thread Starter
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Hi Webcode, thanks for the quick reply. To update problem from yesterday, last night I tried the car and after starting it, the light never came on. I then went on a journey of less than a mile during which the same light came on and was flashing quite rapidly. According to the manual, this light is to monitor the exhaust gases and when it behaves in this manner they advise to reduce speed & contact dealer. As far as an increase in exhaust smoke, I cannot say for sure as it is not something I have been in the habit of looking at I'm afraid, I am the kind of guy that climbs in starts up and drives off ! However, on arrival back home last night,my 8 year old daughter noticed a very strange pungent odour coming from the tailpipe that she described as smelling similar to a spent firework??

Am I correct in assuming that item 3 in your response (regarding the Lambda sensor), is the sensor that monitors the exhaust gases & is responsible for the warning light coming on? If so, can you identify the location and advise whether I can replace it myself?? I am loathe to take it into my local dealer and the next nearest one is 20 miles away & I am not happy at the prospect of driving my iffy car over there.
I assume the local dealer will want to put the car onto his diagnostic kit first (47 +VAT) then charge me ??? for the part required plus a rather large labour bill, what in your opinion is the possible cost involved if I took it into the dealer as opposed to doing it myself and the correct diagnostic procedure that should be followed ? Thank you in advance for taking the time to read this follow up lengthy post and for any guidance given, I appreciate it given the proximity of the festive season and the early xmas bonus I got on friday ( My Cards !) I need to keep the bulk of my cash in my pocket rather than in Arnold Clarkes !!
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post #4 of 20 (permalink) Old 8th December 2005
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WebCode is a star as usual! Jayel - can we presume that the car is used mainly for short journeys?
post #5 of 20 (permalink) Old 8th December 2005 Thread Starter
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Selwonk, After fridays news, it will be for sure! However, for the first 18 months it was used for journeys of less than 2 miles a day. For the past six months until last friday, I was commuting 50 miles a day. Should I go ahead and replace the Lambda sensor or not? Or do you think I should wait for Webcodes suggestion, I would have to agree on the Star issue regarding Webcode, or do you think perhaps that was him on TV the other night and not a fiery comet as reported...........


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engine , engines , missfire , petrol , renault , scenic

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