Q: Water pump is leaking, do I need to replace the timing belt, too? The car also has a misfire on cylinder 3.

asked by on October 27, 2016

I brought my car in to the shop for a valve cover gasket replacement (my dad was gonna replace my wires and found a bigger problem), and today they called saying it's leaking a little oil, but my car is "known for that"... And my water pump is leaking and when they replace that instead, they need to do the timing belt, too. This is going to cost $900. I'm really wondering if I should bother. The issue I was having was the engine misfiring every time I stepped on the gas and the code I got was misfire in cylinder number 3.

My car has 235000 miles.
My car has an automatic transmission.

Timing Belt Replacement $295.56 - $1284.62 Get a Quote
Spark Plugs Replacement $96.63 - $636.71 Get a Quote
Fuel Injector Replacement $379.42 - $3631.88 Get a Quote
Engine is misfiring Inspection $79.99 - $89.99 Get a Quote

Hi there. If the engine has too many miles on a timing belt, then a timing belt is suggested for replacement. The misfire for cylinder 3 could be caused by a spark plug failure, fuel injector failure, or a problem with the cylinder.

First, check for the fuel injector. Start the engine and disconnect the harness to the fuel injector for cylinder 3. If the engine sounds different, then the fuel injector was working. If the engine has no difference in sound, then the injector was not working and needs to be checked.

Next, check the spark plug for a solid blue / orange spark. If the spark is weak, the plugs and wires need to be replaced as a set.

To check the cylinder if it is getting hot enough to burn fuel, put a compression tester on cylinder 3 and crank the engine over. There should be more than 130 psi.

If you need further assistance confirming the misfire diagnosis, then a certified technician from YourMechanic, can come to your car’s location for a second opinion on the car.

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

What others are asking

Do you have to replace a serpintine belt if it gets antifreeze on from a waterpump?

Yes. Antifreeze will cause damage the rubber compound in the belts. If you do not replace it now then it will slip and may cause the water pump installer to not warranty the work.

Car jerks shifting into 2nd & 3rd & slows down

Hello. I would start by scanning the computer for codes as it sounds like a sensor problem. If there are no codes present, then the sensors need to be checked with the scan tool. If all of them are reading...

Horn stopped working.

The horn is powered by the fuse you changed out. The control is the horn button and it goes through the steering wheel and clock spring behind the steering wheel. The horn relay gets power from the fuse and control...

When accelerating from stop, rear end hops.

Hi there. Check the suspension and shocks on the rear of the vehicle. If the suspension is loose or the shocks are worn, then the axle will move around or bounce and keep the tires from being in contact with...

Loud noise at the front end

Without being able to hear the noise, it will be hard to make an accurate recommendation. If the noise is a rotational noise that changes intensity based on road speed then looking at tire wear patterns such as a cupping...

Misfire on cylinder #1

Hello. A flashing check engine light is an indicator that the computer has detected conditions that are harmful to the vehicle's emission system components. Continuing to drive with a flashing check engine light can result in damage to emissions system,...

My car is a saturn vue 05. It starts will shift all gears. But it's not moving when I put into gear. Even in natural it won't move

Hi there. Let's begin with the "N" position for the gear selector. That is neutral, or no direction meaning that the car does not move on its own power in that gear; only if you and possibly help from friends...

Check charging System light

The most common cause for the charging system light coming on is going to be the alternator. The battery is going dead due to the charging system is not recharging it and battery will go dead. In order to properly...

I started my car this morning and went to put it in drive. As soon as I took my foot off the brake to give gas it shut off completely.

This may be related to a couple of possible things. There is a component called an idle air control valve that monitors the air intake as it is mixed with fuel prior to being injected into the engine at low...

Related articles

Is it Safe to Drive With a Misfiring Cylinder?
An engine misfire can be caused by bad spark plugs or imbalanced air/fuel mixture. Driving with a misfire isn't safe and can damage your engine.
The Best Used Cars to Buy If You Live in a Tropical Climate
If If you live in a tropical climate, most of your vehicle purchasing concerns will be essentially the same as if you lived anywhere else – you want a car that looks good, offers decent gas mileage, and suits the...
What Is the Purpose of Engine Gaskets?
Engine gaskets work as seals to maintain pressure, hold fluids, and prevent debris from entering the engine. Gaskets are vital for engine performance.