Quote:
Originally Posted by billy123456789
Hi Guys,
Need some help with my car and will post a video of the issue in the comments.
It is a F10 M5 with Stage 1 Evolve Map for downpipes but now has the original cats fitted back in, also has intakes and cold start delete.
On the first cold start of the day the car idles rough and revs fluctuate up and down almost like the car is trying to rev it self from stalling and then falls again.
I have been thinking it might be related to the Stage 1 map for downpipes and now having stock cats back in without adjusting the map.. issue happened apparently short while after the last owner fitted stock cats.
Before I go down a rabbit hole any comments?
Another question is when you go for downpipes and have your O2 Lambda sensors mapped.. do they adjust the fuel ratio they should be reading? or do they get coded out completely?
Car runs and drives well with no fault codes.
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Here's the basic questions-
Plugs changed? If so, gapped at what?
Cleaned MAF sensors?
Cleaned air filters?
Have you put the stock airboxes back on to see if the issue goes away?
How long have you had it?