Q: My rpm needle moves down a little then up when im at a red light.

asked by on July 18, 2016

Hello when I'm at a red light for more than 45 seconds my rpm needle starts moving down a little then up and my steering wheel starts to vibrate a little. I changed spark plugs and ignition coils but that didn't solve it. NO hose leaks or check engine light. I was wondering if Its my throttle body or idle control valve or possibly something else? Maybe fuel filter or transmission filter?

My car has 51000 miles.
My car has an automatic transmission.

Oxygen Sensor Replacement $108.80 - $869.59 Get a Quote
Idle Control Valve Replacement $146.15 - $920.51 Get a Quote
Car idle is rough Inspection $79.99 - $89.99 Get a Quote

Many early 2000’s Jaguars, including the X-Type and X-Type (R) had issues with faulty O2 sensors, air fuel sensors, and ignition sensors that would cause similar symptoms to what you’re experiencing. However, an idle control valve that is dirty could also cause RPM to lower after frequent idle time as well.

A good bet would be to contact a local ASE certified mechanic and ask them to complete a diagnostic scan of your idling issue. This should give them an error code that they can trace the source of the ignition problem you are experiencing.

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

Car cranks, but doesn't start

Cranking and turning over are essentially the same, so I will assume that it cranks but won't start. There are many variables that go into diagnosing a no-start condition. The fuel pump is just one of many things that can...

Car horn honking by itself

Your clock spring is likely faulty and shorting. The clock spring is the device between the steering wheel, and steering column. It allows you to control the functions of the steering wheel, and turn the steering wheel, while holding all...

2004 Nissan Xterra how much would it cost me to replace the fuse box engine 3.3 liter, speaking in mechanics installation wage?

Claimed by Robert Tomashek

Car runs rough, with choking sound - 2008 BMW 528i xDrive

I'm not sure what you mean by "choking sound." If by that you mean "wheezing", this could be an air leak in the intake - loose or leaking vacuum hose - a common problem with high mileage engines. The Service...

There is an 04 Dodge Ram 2500 w/ 260,000 miles on it for a good price and it's mechanically sound, should I buy this truck?

As you know, with any car the life expectancy of it depends largely on the maintenance schedule the owner has maintained, the driving conditions it is subjected to, the driving habits of the owner and many other factors. Often times...

U-joints and tie rods bad.

Since you don't list your symptoms or reasons for thinking this, the best advice I can give you is to have your vehicle inspected by a trained professional. The technicians at YourMechanic will be able to diagnose and repair any...

Multiple warning lights but car runs fine

Hello. You may have different problems occurring here. Since the Check Engine Light is on, I would scan the computer for codes first. The codes will give me a good idea of where to start with the diagnosis. Due to...

Motor skips a beat only when idling.

Hello - most likely, the idle air control valve is a bit gummed up and is sticking ever so slightly when it becomes the key control at a stop light. Cleaning or replacing it should resolve the "stoplight stumble." ...

Check Engine Light is on - code P0405

This code could be caused by the EGR valve, the EGR valve position sensor, a wiring or connector issue, or even a problem with the PCM. P0405 is set when the PCM sees a voltage reading below .35 volts. So,...

Related articles

The Importance of Warming Your Car Before Driving
Scandphoto / Shutterstock.com Many people feel that it’s important to warm a vehicle up before driving off. This has long been the dominant school of thought, dating from when cars had carburetors and many would not run...
How Long Does a Timing Chain Last?
A timing chain is a metal chain, as opposed to the timing belt which is made of rubber. The chain is located...
A Buyer’s Guide to the 2012 Jaguar XF
The The Jaguar name alone represents luxury, performance and prestige in the world of high-end vehicles. The XF was completely retooled in 2009, a sign of the premium carmaker’s efforts to draw in younger consumers and attract a whole new...