Puttering sound when cruising
 

Ok i asked some people and searched and got no results sooo... When im driving around and when i just barely have my foot on the gas(like where it would be to keep constant speed) it makes like a puttering sound. Any clues as to what this could be and another thing while im posting at like 1500 and 2500RPM my car wont stay at those constantly it revs up then down then up then down on its own, not a vac leak(that i could find anyway). Any help with that would be good too.

fuel filter is dirty possibly...when was the last time you changed it...i had this happen to me recently and changed the filter yesterday. Everytime after a certain amount of time I would be crusing along and out of nowhere it would seem to putter a bit like something was missing and then go away and then come back some time later.

fuel filter changed rougly 100 miles ago

hmmmm. TPS adjusted correctly?

ill have to check it. Im starting to get most bucks worked out in the car. Thats and some clanking and the reving thing all thats left.

well at leats your getting bucks out of the car instead of putting them in. :)

man i just realised how crappy i typed that response what i ment to put was i am getting most of the BUGS out of the car. All thats left is this, some clanking(more than likely my diff mount) and the whole reving thing at 1500 and 2500RPM.

At very light gas pedal pressures (between engine braking and actually generating power) the engine will "putter" somewhat. There's a very fine line, but mine does the same thing (I think). On one side of the line is engine braking, on the other side is accelerating or holding a higher speed, but right on the fine line there's a unique sound. I never thought it odd, just a sound that the engine makes under certain load conditions.

-=Russ=-

The "puttering" sound is the engine running on only one rotor. When the throttle is closed, the fuel injectors are shut off to save gas, and then turned back on when the throttle is opened. To make this action a bit smoother one rotor's injectors are turned off (and back on) slightly before the other rotor's, so it is possible to hold the throttle at a point in between where each rotor's injectors are turned on and off.

Since the TPS is the critical component in the injectors being turned on and off, if the it's set properly this transition is less noticable.

This has nothing to do with the fuel filter...

thanks NZ i will have to check it later to day as its 1:15 AM now.

Thanks! I didn't know what exactly it was, but that makes perfect sense now.

-=Russ=-