i was hoping john paul can help me with my problem ,?

Question

being a nissan master tech , cause my dealership (action nissan) can't seem to fix my problem , my car has been in and out of dealership past three weeks, i think valves or variable timing, or clogged cats car has 78,000 miles 2002 altima 2.5s
car runs fine until high revs 4500rpm then tugs and pulls , pelaced just about everything. except coil packs and head,valves cams

Answer 1

Houston we have a problem! You are experencing a problem that the exhaust shield and reprogams just did not fix. First off you are under eight years and eighty thousand miles. Emissions warranty and Nissan Good will may still applie. Here how it has to go. Run a compression test how much engine oil does it use? Any more consumption lately? If compression does not direct the tech to a "new engine" Another cause of power loss remove the top of the intake manifold and see if the four power valve buterflys are where they are suposed to be not down in the intake blocking the air flow to one or more cyls. Missing throttle power valve screws can be another cause for "new engine". And with a new engine insist that the front cat converter exhaust manifold is also replaced. Arm your self with oil change receipts and service history. It would not hurt call 1 800 NISSAN 1 And get a Customer rep involved. Good luck Not all 2002 altimas need engines about one in a thousand.

Answer 2

try getting an alignment on the wheels.