Q: Do I need a crankshaft position sensor
Car runs fine at traffic lights it idles a little rough,,had tune up ,mass airflow sensor replaced
My car has 170000 miles.
My car has an automatic transmission.
Recommended Services
| Fuel Injector Replacement | $400.56 - $3968.30 | Get a Quote |
| Idle Control Valve Replacement | $162.54 - $1028.01 | Get a Quote |
| Clean Throttle Body | $109.17 - $370.59 | Get a Quote |
| Car idle is rough Inspection | $94.99 - $114.99 | Get a Quote |
Typically a bad crank position sensor will prevent your vehicle from starting. Your rough idle could be due to a vacuum leak or possibly a dirty injector, or maybe even an idle air control valve or throttle body that needs cleaning. If you notice the problem getting worse, I would recommend having a certified technician, like one from YourMechanic, come to your home or office to diagnose your rough idle and make the necessary adjustments or 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
What others are asking
Car has sat for a month and won't start
It's not uncommon for your battery to be drained down if your car sits for a month without starting. Modern vehicles have a lot of technology which requires a lot of computers. Those computers have what is called keep alive...
wont shift into 3rd gear
At this age of the car, you will likely need a transmission rebuild. The bands that wrap abound the planetary gear assembly typically crack. Of course, checking the transmission fluid level (https://www.yourmechanic.com/services/transmission-fluid-service) and condition of the car while running in...
Sudden drop in gas mileage
There are multiple factors that can affect your gas mileage (https://www.yourmechanic.com/article/how-to-easily-increase-your-gas-mileage-by-jason-unrau). Some of these factors would include: how clean the air filter is, how well fuel can flow through the fuel filter. If the fuel filter is doing its job,...
Valve lash is good,check rod bearings. Engine taps under load.doesnt tap when in neutral and revving engine. Timing off 1 tooth?
Hello. Check intake vacuum at idle to "guess" as to the status of the timing. If below factory spec., for example if as low as 15 inches or so (vac. gauge reading), you might be off a tooth. Really, the...
My cooling fans aren't working properly I think ...P
The cooling fans (https://www.yourmechanic.com/parts/cooling-fan-assembly) work according to relays that detect temperature and cause them to turn off and on. When these relays are not working properly, this will cause them to come on all the time, not at all or...
When a/c was on, steam from under hood and a/c went warm on a hot day and on another day came out cool for a several minutes
The source of the steam should be the first thing repaired. It is highly probable that once the leak is repaired, the A/C system will begin to work again. There are two fluid sources under the hood that can create...
No compression but spark is there, fuel goes good. What is happening? The car only cranks and doesn't start.
Hi there, thanks for writing in. Unfortunately, if there is no compression, you have internal engine failure. This could be piston ring failure. Generally, a used engine would be the order for the repair as the cylinder walls could be...
I want to put a straight pipe with no muffler on my 2005 Chevy Silverado and keep the catalytic converter
Removing the muffler will not decrease the horsepower, but instead it will create less back pressure on the engine, making the engine breathe a little more. Make sure that the exhaust will not be too loud for the zoning laws...
Power window switch not working 2006 Chevrolet Impala
Hi there - check fuses/relays for the power windows first. If fuses and/or relays are good, your symptoms suggest that the power window master switch (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-power-window-switch) on the driver door panel has failed. I recommend a power window master switch...
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...
The Best Used Cars to Buy for Families
If If it’s time for you to search for the top used cars specifically for families, check out the list we’ve put together of the top five. The list of must-haves Typical items that families are looking for in their...
Mitsubishi Certified Pre-Owned (CPO) Car Program
If If you have been shopping for a used Mitsubishi vehicle, you may want to check out cars under their certified pre-owned program. Many manufacturers have a certified pre-owned (CPO) program, and each one is set up differently. Read on...
Browse other content
Estimates
Maintenance