Hi everyone, Its not very often I drive straight off when I start the car, but I've had this a couple times now. It happened again yesterday. When I start the car it just seems normal on the cold start map, I headed straight off and as I was going down the road it just seemed rough/lumpy, and lacking in power. When it's warmed up its fine. It just doesn't run smooth when cold As I say it's not very often I drive straight off once started I normally let it idle for a minute or 2 then drive off and it's fine when I do this which is why I've never really noticed it. I haven't plugged diagnostics in yet, I've got some Delphi diagnostics I was guna plug in later on after I've sorted the Mrs car out. does anyone have any suggestions what could be causing this? just trying to gauge an idea before I plug in
There all a bit rough and lumpy when warming up, mines the same sometimes worse than others depending on the weather
As above, I wouldn't worry if it's only when first started and it's getting any worse. Seem to be a property of the F4R(T) engine. My new Trophy does it.
TADTS. every performance Renault I have had always does this when cold. The twingo 133 was particularly bad.
Ok thats reasurring, as I say its rare I go straight off on cold start anyway. Ill just keep doing what im doing lol
I'm busy trying to solve this issue on my 225 at the moment. I don't believe they would have done it when new, so something has changed over time to make it happen. I'm just getting injectors cleaned. I'll let you know if that helps me.
Mine too, my old 225 was the 'normal' rough when cold, but the R26 isn't in the slightest. It's mapped but so are plenty of others that do run rough cold.
Second renaultsport and it has done it on both. Brother owned a 200 and a V6 which both did it. And mate had a 197 which was very bad for it. Standard Rsport.
Ive had a read through your thread about this, and you seem to be looking at similar options to me. Thing is ive already changed injectors as mine were bit worse for wear last year, I fitted a set of ultrasonically cleaned ones as I had the usual lumpy idle and slight missfire when driving. Plugs are recent too, as is lambda sensor. I also have a scangauge fitted so I can moniter the temp of air and coolant and these are both reading about the right temperature from the point of start up to the normal running temperature So its a tough one really as the diagnostics ive plugged in also return nothing as you found. I was looking at changing the thermostat as its quite cheap and tends to be changed by a number of people on here, so thought id give it a go next week. But then from the replies of others it really seems like one of those typical frenchcar things where you get a good one or a bad one. its also the sort of car most people will warm up before driving so leads to less people noticing the potential 'issue' and is one of the reasons why I never really noticed it as I very rarely drive straight off.
Did you get a report with your injectors? apparently the Ecu can deal with them being only about 5% different. After that you'll notice an issue. Also Renault are about the only people who use these injectors. VW used them for a while but then changed back to Bosch as the Renault ones wear badly and that's their biggest issue. Still not got my injectors done. Will be in the next few weeks, but i'll report on my findings. will keep an eye on this thread if you can let us know what you've been doing. oh- will definitely be checking my fuel pump and pressure regulator. does your scan gauge give fuel pressure readings btw?
