2004 merc. mountaneer 4.0 v6 93,000miles
it was making a rattling noise when accelerating for some time but it went away after getting up to normal speed.didnt alarm me much. 2weeks ago it just started sounding like a diesel(noise is def. coming from or echoing through the plenum)its been using a lot ofgas also i though t sounded out of tme so i checked it and it is bout 19degrees advanced but the timing jumps around does not stay at 1 point
put it on the obd2 scanner
obd code p0340 ,&p1336 came up whenchecked. i change the cam sensor and chec engine light still cam on but only the p0340 code was present now.so i changed the crankshaft sensor. same code coms up.p0340 i took the plenum and valve covers off to do a visual nspection of timing chains n guide. everything looked fine.put it aall back together and still having same problem. i was told t my need a varition relearn done or pcm updated is this true for my truck?
i evn changed the plugs wires oil and filters thnking it may be causing the roughness but nope
i am very handy and an usually fix cars but i am at my wits end with my mountaineer..i also esed a volt meter to check th wires going into the cam sensor and it read correctly what could cause th timing to be off? and o jump around so much?