Hi guys new to the forum so still learning, lol.
Got a bit of a weird problem here. I fitted Japspeed decats about a week ago and everything was completely fine. (not sure if these are linked to the problem, thought I'd mention it).
Part throttle driving, 1/4 throttle, 1/2 throttle pulling up the rev range there is no misfire.
Full throttle, foot to the floor there is no misfire.
But
At about 3/4 throttle when pulling from around 2k rpm, as soon as it hits 3k rpm, I get a sudden splurt, jolt, misfire, but as soon as I pass 3k it's fine. It's mostly noticeable in 3rd.
It's on 40k miles and due for a plug change, but surely if it was plugs it would happen all across the rev range.
Also I have lambda sensor sims fitted to the decats which already have a spacer welded on them. I had a quick look under the car and the sensor wires are pretty low, and look like the may have rubbed on bumps but haven't jacked it up to have a proper look.
Could this be a lambda sensor fault from possible wire scraping or does it sound like something else?
Or are there issues with the stock map when fitting decats and not having a remap?
The rest of the rev range it feels ok, maybe a bit down on power but that could be me being paranoid.
Cheers guys