Skip the auto shop - Our mechanics make house calls

Q: My car is racing in park

asked by on

OK I have a Nissan b15 and every time I start it the engine racing in park position. what do you think is causing that...

A: Hey there. This is usually a sign of a vacu...

Hey there. This is usually a sign of a vacuum leak or a faulty or dirty idle air control valve. The idle air control valve is a unit that reads the air coming into the motor as it is mixed with fuel prior to being injected into the motor. The computer uses this info to make adjustments to fueling. When this is not working properly, this may cause an imbalance in the air/fuel mixture causing a lean condition which generally will make a motor idle very high. The same effect is also true when you have an intake leak or some other vacuum leak that causes an increase in air intake relative to fuel supply. If you would like to have a precise diagnosis on this, a certified technician from YourMechanic can come to your car's location to inspect the high idle and follow through with repairs.

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

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Engine is hesitating during startup - 1989 Chevrolet K1500

Hi there. Check the static electronic timing with your ignition system. It seems as if the ignition timing is retarded and needs to be advanced. If your distributor is maxed out for advancement and will not move anymore, you will...

Q: my car cannot move even on drive or reverse. it is not responding to gears

Hi there. It sounds like there could be a serious transmission issue at hand. However, there are a few other possibilities: a broken shifter cable or switch assembly. Does the gear indicator change when the shifter is moved? If not,...

Q: Fuses getting no power.

Fuses are circuit protection devices. They are designed to blow when the current passing through exceeds the fuse amperage rating. Not all fuses will have power all the time; some will only have power with the ignition on. So, you...

Related articles

How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...