Ok, you know that when you accelerate aggresively, you hear the engine getting louder as you accelerate. Well my problem is that the engine sound when accelerating gets cut off then continues kind of rythmically like if it was stalling, But, it's not a stall. The car does not loose any power or hesitates during this and the rpm needles moves normally. It's driving me crazy.
Let me try to explain. If the sound of your engine while accelerating could be represented by a straight line like this:

1000 RPM ----------------------------------------- 4000 RPM

Mine sounds like this:

1000 RPM --------\--\--\-\----\---\---\\\-\-\\---\\\--4000 RPM
(each diagonal line being a sort of interuption of the normal accelerating sound)

If I accelerate the car with the tranny in PARKING or in NEUTRAL, it does not happen. It only happens in DRIVE, and without any noticeable loss in power from the butt dyno.

If anyone has any input on this problem, please reply
Thanks ,
Alex

 

tranny slipping????

 

Ignition coil ? alot of people had their 2000 max coil repaced

 

coils have nothing to do with that, it would create misfires which would reduce the rpm and make the car shake side to side.

 

i would say check the MAF and the intake tube for holes, one of my intake tubes was loose so the MAF couldnt get accurate airflow. when the engine shook it caused air to suck through the gap further down the line

 

No, the tranny is not slipping, and there seem be nothing wrong with the RPM's and my mech said that if it where the coils it would feel very different. He doesn't know what is causing it.

 

How do you know the tranny is not slipping?

If it's not coils, and, say, it were pinging/detonation causing it... you might see it as a series of interruptions in the engine's normal operation, each interruption occurring when the ECU pulls back the ignition timing, but you should also feel a mild decrease in forward acceleration when that happens. Ditto with coils (actually the coils' symptoms usually involve pinging, which is induced by the coils), and possibly ditto with tranny slipping.

If there's a major fuel system problem or whatnot, you might find clues by having an OBD-II scantool hooked up that can examine sensor readings, and check out the Long Term and/or Short Term Fuel Trim values for both banks under acceleration (if any readings show ridiculously high, like above 20-30% positive trim, chances are something's screwed up)

 

I'll get it scanned with the OBD-II, and see if anything is up with that...

 

yea my car does that too. it is even more noticeable now that i have an intake because the growl is more pronouced.

 

Can you possibly or have someone record the sound so we can have a better idea of how it sounds like?

 

I just got the same problem for about 2weeks now, and i dont know where it came from.

 

How many miles on the car? Might be time for new spark plugs.