[lpeters744]

I have a 2001 ll bean h6 118000 miles that has developed a strange rumble and a hesitation when accelerating from a stop.It does not happen untill the car is warm or it is hot outside.It also pulls slightly to the left.I have checked the Cv boots and all are still in good shape and have drained and refilled all the differentials. The transmission has also had newfluid and filter.The car does not bind at all in a sharp turn.Any thoughts on what else to check.

 

[1 Lucky Texan]

any repairs, maintenance or wrecks before you noticed this?

have the brakes been inspected and well maintained?

Is this rumble 'felt' or heard? Could you have someone (carefully) pace the car on foot during some stop-start tests and pin down which corner the sound comes from or front/rear/center of the car?

 

[Greghhh]

Without hearing it, one can only guess. A rumble upon starting out could be a bad motor mount or the engine bumping something. Pulling to the left when driving often is a tire or alignment issue. Some of the hesitation could be gas with less than 92 octane as that is what is called for this engine.

 

[cardoc]

Yep, too many things could cause a rumble and hesitation. Engine or transmission controls or a combination of the two as they work in conjunction.

Mechanically, if there aren't any codes, fuel filter, air filter, tps, maf, torque converter. If it runs fine cold and changes with operating temperature, heat expansion could be effecting the component that is failing. Look for the simple things first.

With the pulling, check your tire pressure. If it began suddenly, a low tire will make it pull. If the tire pressure is good, check the alignment. Be sure you have a trusted technician that will actually spend the time to align all 4 wheels.