Uneven running is slightly worse with the lights on!

[lancelin]

Hello, I have a Griff 500 with the canems conversion! The car is great while driving above 2000rpm. Unfortunately while driving in slow traffic and changing gear there is a slight hesitation after reengaging the clutch again and applying throttle. No matter how hard I try with different amounts of throttle and clutch combinations it’s not always easy to make the process smooth. There is a slight transmission clunk when it happens. Its like there is a delay between the throttle opening and the engine responding. The problem is only slight but it still detracts from the whole driving experience. There is also some very small shunting while letting the car slow down in the gear especially in 2nd. My first thoughts are it’s a mechanical problem but after switching on the headlights the problem is noticeably worse!!!! Uneven running below 2000rpm is the most complained about problem and has been covered in many posts but I haven’t heard of headlights influencing it. Just wondering if anyone else has noticed this. I’ll be checking electrics at the weekend for ground loops etc but I wonder if it’s still a mapping issue and the load on the engine in closed loop mode is altered with the lights on and the mapping is different. The other thought is the revs need to be held up a bit more after lifting off – how can this be altered with canems software? I’m a bit fussy BUT life is all about continuous improvement!

[lancelin]

Thanks Steve, I'll check the canems settings. I have a new upgraded alternator! I even tried running the car without the alternator for a short distance to see if alternator electrical noise was causing it.

[lancelin]

The idle stays the same with lights on and off. I have a new battery. Yes, the clunk is a bit of transmission slack. I have a device for measuring spark performance but the canems system uses coil packs which should give better sparks.

[lancelin]

Thanks a lot for the info. I’ll have a play at the weekend and let you know how I get on. I was thinking the idle valve could be adjusted to help. Thanks Dave. Really pleased I have an original Bosch part and not the cheap aftermarket one that was originally fitted - this part failed and caused erratic idle.

Might invest in some engine mapping literature. Failing all this I’ll fit an electric motor!!!!! Imagine a hybrid TVR! I suspect Dave is already thinking about it. Petrol, lpg and electric.

[lancelin]

Well, I’ve been playing with the idle valve settings and it has made a difference. I think its super sensitive to the parameters chimp outlined. The car is almost a pleasure to drive in slow traffic!