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Renault Clio 1.4 K4J 2000 - Misfire and backfire - Unresolved #

Posted by George Ambelas on December 5, 2016, 5:32 pm

Year of Manufacture *: 2000
Engine Size and Code *: 1.4 k4j
( Optional ) Scanner Used: ss2 maxisys opus
( Optional) Fault Codes: no fault code

hi everyone i have got this in for the day trying to find out why it's misfiring and backfiring. i have scanned it and no codes the engine idles smoothly and picks up revs well in the workshop if i do it slowly, but if i snap it it misfires and backfires so far i have smoked it, scoped the coils, the crank sensor, oxygen sensor, replace the spark plugs it's still the same i have checked the emmisions and they look good i wanted to check the timing but there is no easy way to do this without destroying the cups there does't seem to be a cam sensor to compare it with the crank sensor. any ideas?

Re: renault clio misfire and backfire

Posted by Andrew Evans on December 5, 2016, 7:09 pm, in reply to "renault clio misfire and backfire "
Andrew Evans

What vacuum have you got at idle?

Re: renault clio misfire and backfire

Posted by george ambelas on December 5, 2016, 7:50 pm, in reply to "Re: renault clio misfire and backfire "
George Ambelas

thanks andrew i will check tomorrow also the customer told me today that there is a lot of black smoke when the engine is cold which i did't see as the engine was hot when it came in so i will also check the water temperature sensor in the morning

Re: renault clio misfire and backfire

Posted by Steve Harvey on December 6, 2016, 7:42 am, in reply to "renault clio misfire and backfire "

Hi George,
Have you checked the fuel pressure?
Regards Steve Harvey

Re: renault clio misfire and backfire

Posted by Mark Lamont on December 6, 2016, 1:37 pm, in reply to "Re: renault clio misfire and backfire "
Mark Lamont

Hi George, have a look at the plastic fuel pipes that are clipped to the back of the cylinder head. Seen them kinked which causes exact fault you have

Mark

Unresolved #

Posted by george ambelas on December 6, 2016, 3:11 pm, in reply to "Re: renault clio misfire and backfire "
Edited by board administrator December 7, 2016, 12:30 pm

i have spend a couple of hours today i disconnected the exhaust just in case it was blocked but no difference starting it from cold today it was running really bad and smoking once i managed to steady the revs at 2200 rpm for a while and looked under the car the cat was red hot so i left it and told my customer that it looks like the timing is out but he was't prepared to spend any more money on it so the car goes unresolved. thanks for your comments

Re: Unresolved #

Posted by LIAM MURRAY on April 7, 2017, 8:38 am, in reply to "Unresolved #"
Liam Murray

i had the same issue with this on a number of clios, it can either be 1 of 3 things:-
1.the injection computer required re-programming, 2.throttle body adaption or
3.the more common issue of the engine wiring loom.

hope this helps

Liam Murray CAE MIMI

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