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The Long fuel trim idle image is just showing a variation from -3.1 to -2.3 ( a change of 0.8) The long fuel trim revving is me blipping the throttle showing all the spikes (which cover the range of 11.7), before I hold the revs around 2500 which shows a plateau at the end around a value of 8.6...

Hi Pedro, I guess this chap was having actual fault codes show up, I just have the odd misfire(s) shown for the last run - no codes ever latch as DTC errors. Again, I may just be chasing ghosts? Regarding the fuel trims, I guess the high and low fuel trims are labelled as SHRTFT1 and LONGFT1...

Thanks Pedro! I'll get back when I've investigated further.

Thanks Pedro it gives me a direction to go in. What do you mean about checking the fuel trims? How do I go about that?

Thanks. I'd really like to see how a "normal" engine behaves on idle before I think about taking the head off. Whether these graphs mean anything is actually wrong. I could go to a main dealer to see if they have an opinion, but that could get costly. I may just be chasing ghosts at the moment...

Wouldn't that sort of damage indicate one particular piston/cylinder? It could be general damage of course (which sounds very expensive). I'm wondering if anyone has tried looking at the state of their engine in idle mode? Are these kinds of variations normal? (I'm thinking that noone would...

I still have a few misfires shown after reverting the re-map (but they are never logged), but I suspect that was happening from when I bought it second-hand. After the re-map, I bought an Autel AL519 to see if I could see anything. There were quite a lot of misfires being shown. Since reverting...

Thanks for the input Pedro. A little more background. I have always suspected the power wasn't great, but as this is the only 200 I've ever driven I can't be sure. I didn't test for misfires before I had it re-mapped. Celtic stored the original software from my car and reloaded that same version...

Sharing this in the hope someone has seen similar. I re-mapped my 200 with Celtic, and had timing and misfire problems with latching error codes. That got me into a long process and analysing with an OBD monitor. (Autel AL519). I finally decided to revert the mapping back to factory default...

As an update to my Celtic remap, I reverted it last November (2023). I had a number of problems appear after the remap that I lived with for too long: - "pinking" (pre-ignition) - initially thought it was an exhaust blow - very "digital" pick-up on the accelerator, extremely difficult to drive...

What was your problem in the end? I assume you got it fixed? Was it wiring?

There is some history on this, but I'll try to be brief. - I had all plugs and coil packs changed a few months ago - reason was a failing coil pack on cylinder 2 Car ran well afterwards, but I have noticed what sounds like a blow on the exhaust, when it gets hot - mechanic can see nothing wrong...

I had my 200 remapped by Celtic - took me up to 235bhp for the stage 1 remap - have been very pleased with the improvement in acceleration. I have wondered about the R, but honestly this feels pretty good.

New to the forum, been driving a grey 2014 RCZ 200 GT for almost 2 years. Love it to bits, even with a couple of niggles.