Need a little help. Just changed the exhaust manifolds, keeping the orig. cats. No error indication at all " check ok " But engine runs rough. vibrations from 3500-4500 rpm feels like its not running on all cyl. Thanks. Lisgaar
There is no CEL? Did you plug a scan tool in to see if there were any codes that might be present without tripping an engine light?
there is a good chance that one of the thermocoupler went bad. That is the temperature probe that goes into the cat. We have seen them go bad just from simply removing them and putting back in. Check codes for sure first.
Thermocoupler, thats just what i had in mind. Will get the codes monday. Had to pull quit hard in the righthand side. Thanks for your help. Will keep you informed. Have nice week-end. Spring is on its way, so a lot of ferrari driving hopefully waiting for all of us. Lisgaar
