On my 98 4.0 aw4 xj with ~115k miles on it makes a hissing/slight whining noise when Im light on the throttle. Between the engine and transmission there is a decent amount of fluid caked onto the bellhousing cover. I cant tell if the noise is coming from the cat (possibly clogged) or the transmission area. Sometimes it wont lock up and it'll slip when shifting or on the highway a little (not more than 5-10%).
Something else I noticed with my scangauge (im sure the numbers would be similar with vacuum gauge) is that my MAP goes from 6psi (normal) at idle to 3-4psia when throttle is slightly open. IMO thats not supposed to happen....it used to go to 10-12psia when in neutral and slight throttle opening. Do I have a bad map sensor, vacuum leak? Whatever it is makes me think the computer sees low pressure and uses less fuel possibly making it run lean? Im gonna run a compression test tomorrow and hopefully find some good numbers. Any thoughts? Thanks in advance.
Something else I noticed with my scangauge (im sure the numbers would be similar with vacuum gauge) is that my MAP goes from 6psi (normal) at idle to 3-4psia when throttle is slightly open. IMO thats not supposed to happen....it used to go to 10-12psia when in neutral and slight throttle opening. Do I have a bad map sensor, vacuum leak? Whatever it is makes me think the computer sees low pressure and uses less fuel possibly making it run lean? Im gonna run a compression test tomorrow and hopefully find some good numbers. Any thoughts? Thanks in advance.