Does anybody know what would effect the engine running when hot but not cold. I've narrowed down the misfire or what ever it is? that it doesn't seem to effect the car when the engine is cold and only starts to kick in when it's hot. I've thought about the temp sensor but does this just sense that the engine is cold and make the mixture richer? if so what else would effects the mixture, if it's running lean when on the move then this may cause it to run poor.
Hi you could also try checking the fuel pressure and fuel delivery when the engine is hot it could be that the fuel pump is not operating to spec when it,s been running for a while,also try a compression check with the engine hot , at least if the check is positive it,s another possibility eliminated.
i totally agree with paulxlewis, i had exactly the same problem with a hyundai s-coupe i had (nasty little car!) it ran fine when cold but after running hot for a while it started to misfire, before eventually it became hard to keep the revs up,and i had to slip the clutch a LOT eek! just to keep the korean piece of s**t moving the problem i found out in the end was fuel starvation to the engine caused by a faulty fuel pump.
I'd advise getting it checked out and see what kind of pressure its kicking out to the engine.
I had one aswell. It was a 1996 SE (body kit and lowered as standard with "nice" alloys). Mine had the whopping 1500cc Turbo engine......Wooooooo!!
Funnily enough, mine started to misfire at about 1500rpm and had to slip the clutch a lot to keep it smooth when pulling away. I traded it in for a 1997 Lantra 1.8Si which I then rolled two years later.
back on track , i used to have a misfire at 1800 rpm only when hot as in after a few minutes of ticking over when the revs dropped down to 850 i spoke to countless people about this and a lot of people told me it was normal i did not accept this changed a few things (coils/plugs/leads) to no avail then one day i noticed it had gone and has not been back since wink the only thing i can think of is that id had the engine on diagnostics which showed slightly that the lambda was on its way but id replaced it a year before the guy did clear the faults from the ecu and i sort of linked it to that ,maybe it was running to falback settings because of previously stored fault .i know you have had yours on the tester but i thought id better mention it good luck on sorting it Ian.