Q: Serpentine belt constantly slips off

asked by on November 01, 2016

The serpentine belt on my 99 ford escort ZX2 constantly slips off. I have to put the belt back on at least 3 times a week. I've recently replaced it with a new belt and it still happens. I notice that every time I start my car, the belt slides off a bit on the tensioner. I'm not sure if the tensioner is misaligned or if it's broken and needs a replacement. Any help would be appreciated. Thanks in advance.

My car has 180000 miles.
My car has an automatic transmission.

Idler Pulley Replacement $108.97 - $399.46 Get a Quote

Hi. Most likely there is something out of alignment in your pulley system causing the belt to come off. The first thing to inspect would be the idler pulley. Remove the belt and check if the pulley wobbles. If so, the bearing is out and causing the pulley to be out of alignment. If you need to have the fault correctly identified and repaired, a certified professional from YourMechanic can come to your car’s location to inspect the car and follow up with repairs.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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


Experienced Mechanic?

Earn up to $70/hr

What others are asking

8000 first oil change
If your manual says to change the oil (https://www.yourmechanic.com/article/when-should-i-change-my-oil) at 8000 miles then this is the official manufacturer recommendation. You have the choice to change the oil and filter sooner, but you will still need to monitor the oil level...
Car cannot start, check engine light on
A vehicle that cranks but doesn't start indicates a problem with fuel delivery, ignition, or compression. A vehicle that doesn't crank at all indicates a problem with the starting/charging system or an internal engine mechanical problem. You said the Check...
Engine shuts off, white smoke coming out - 2001 Toyota MR2
Hello. White smoke (steam) makes me think that this is antifreeze. Check to be sure your radiator coolant level is not dropping. If so, could have internal leak to cylinder. A misfiring cylinder is caused by mechanical problems or an...
Check engine -- timing chain
Usually when an OBD-II error code is triggered by a damaged part or sensor, it is stored inside the ECM until the issue is repaired, but must be downloaded and cleared by using a professional digital scan tool. The check...
Car won't start after doing valve cover job.
Hi there. From the description you have provided, something was reassembled incorrectly. Not replacing the upper intake (plenum) gaskets should not have caused the vehicle's no start condition. Once that you have the plenum removed, carefully inspect all the components...
top up washer fluid
Hi -Filling the windshield fluid reservoir (https://www.yourmechanic.com/services/windshield-wiper-refill-replacement): Inside the engine compartment, towards the front of the engine compartment, in the corner there will be a flip cap with a picture of a windshield wiper. This is the wiper fluid reservoir...
Bad crankshaft sensors - would that cause the problem of poor acceleration? 1996 Chevy K1500
Hello - yes, a failed crankshaft or camshaft position sensor (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-crankshaft-position-sensor) can cause a "loss of power" situation. The ignition system has a limited fallback ignition timing scheme to allow the vehicle to run, albeit with little power, to get...
Where is the starter on a 2009 Jeep Patriot
On your car, the starter is below the air cleaner box and air tube. You have to remove those, as well as other components to access the starter. Once you have accessed the connections to the starter, test for power...
how to change the language in a 2016 jeep compass Uconnect Radio
Hi Darryl. You might want to watch this video (https://www.youtube.com/watch?v=dfm-goFg-qo) to learn how the UConnect language settings can be changed. Also, refer to your owner manual for additional instructions.

Related articles

A Buyer’s Guide to the 2012 Ford Fusion
Choosing Choosing a mid-size sedan for your family can be a tough call. There’s a lot of competition out there, including really popular models like the Honda Accord and Toyota Camry. Among all those, though, the 2012 Ford Fusion really...
The Best Used Cars to Buy If You're a Skier
When When summer ends, skiers start thinking about hitting the hills, and that means having to contend with winter driving conditions. Not just any vehicle is going to get the job done. We have evaluated several used ski-worthy vehicles, and...
How to Use the Ford Active Park Assist Feature
There There are few driving maneuvers as universally disliked as the parallel park (https://www.yourmechanic.com/article/how-to-park-your-car). Most people still remember that terrifying sequence of movements in their driving test. Even people who live in metropolitan areas, people who must regularly parallel park,...