Skip the auto shop - Our mechanics make house calls

Q: I replaced my tensioner and drive belt and the tensioner still jumps when its in gear. What could be the problem?

asked by on

The tensioner is new. The drive belt is new. The noise is still coming from the area of the tensioner. When the vehicle is in drive gear the tensioner vibrates. The car vibrates when its idling. I do not know what else to do.
My car has an automatic transmission.

Hello. You may need to approach this issue from two different angles. One of which is to figure out if the tensioner is mounted incorrectly. Make sure the retaining bolt or screws are dry and tight. If the pulley wiggles when the vehicle is off, or has any excess play, this issue isn’t necessarily the engine. It could be that the drive belt tensioner is loose. This may be due to the components being stripped, the bolt or screw being stripped, or various other damages. If the tensioner pulley is on tight, the issue may be excessive engine vibration. This may be due to running issues, or bad motor mounts. The first thing to do is check the durability of the new tensioner and its installation. If the tensioner seems to be mounted correctly, then turn your attention to checking for excess engine vibrations.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  • Home
  • Questions
  • I replaced my tensioner and drive belt and the tensioner still jumps when its in gear. What could be the problem?

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: How much wear denotes for a power steering belt change?

Hey there. The belt would need to be changed if it has signs of dry rot, cracks, or pieces of the belt missing. The mechanic will also note bad glazing on the belt surface. The last reason to replace the...

Q: Belt squeaks on start-up when cold or damp outside but squeak only last for few minutes

You should have the belt and tensioner checked to see if the belt is worn or stretched beyond its limit causing the tensioner to not keep it tight and allowing it to slip when damp or wet. Remove the belt...

Q: Too little flow on the EGR.

Have a certified mechanic check the operation of the EGR(exhaust gas recirculation) system. In many cases, the fault can come from an EGR valve that is not working properly or carbon build-up blocking the recirculation passages.

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.