Right so new member here, had my 2008 HR with 110K on the clock for about a year now (had 89 when I got it) absolutely loved it, but it’s got an issue I’m struggling to solve. It’s a jolt between 1100-2000 revs, it happens when selecting cruise control at 30mph in 5th gear, it feels like just as it’s selected the fuelling it suddenly forgets it jolts quite violently and then Is fine. It also does it under light throttle but is much worse if going up a hill (I’m guessing because of more load), it also does if you’re sat at idle, give it a rev and just as the revs get to 1500rpm it hesitates and jolts slightly.
It’s recently done it slightly while just idling and that’s what’s made me turn to the forum. I’m thinking it’s AFR related, but doesn’t throw any codes. Throttle bodies are a bit dirty but appear to be functioning fine and tbh I don’t dare clean them as I’ve heard horror stories. I’ve replaced both fuel dampeners on the rails but doesn’t seem to have made a massive improvement.
any help would be greatly appreciated, as I’m unwilling to just slap sensors and parts on it left right and centre. If anyone has experienced this or knows any way that can help diagnose the issue it would be greatly appreciated