Q: 1995 honda civic dx when starting in first the car jerks back and forth and sounds like its reving high then low then goes fine

asked by on July 25, 2017

when putting the car into first gear letting off the clutch and giving gas the car rpms sound like they are dropping and jumping back up car jerks as if its hesitating. when driving in a higher gear the car does fine until you let off the gas and apply gas again car jerks when doing so. i replaced the tps sensor checked the maf sensor by unpluging while the car is running and the car died so the maf is fine.
My car has a manual transmission.

This may be a sign of a faulty MAP sensor as the vehicle responds adversely to a load put on the motor (i.e. putting it in gear, making turns (which makes use of the power steering pressure switch) turning on AC or engaging the brakes). The Manifold Absolute Pressure (MAP) sensor senses engine load and generates a signal that is proportional to the amount of vacuum in the intake manifold. The engine computer then uses this information to adjust ignition timing and fuel enrichment. When the engine is working hard, intake vacuum drops as the throttle opens wide. The engine takes in more air, which requires more fuel to keep the air/fuel ratio in balance. When the computer reads a heavy load signal from the MAP sensor, it adjusts the fuel mixture to slightly more rich than normal so the engine can produce more power. The computer will then retard (back off) ignition timing slightly to prevent detonation that can damage the engine and decrease performance. This may also be caused by other closely related components such as a dirty or failing mass air-flow sensor, a faulty throttle position sensor or potentially a vacuum leak. I would recommend having an expert from YourMechanic come to your location to diagnose and inspect your vehicle.

Was this answer helpful?
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

Get a quote

What others are asking

Alarm goes off after replacement of battery - 1995 Saab 9000

This requires Saab-specific expertise to reset the alarm system. Check with your Saab dealer, an independent Saab repair facility, or a professional mechanic, like YourMechanic, with this Saab-specific expertise.

How do you adjust the position of the power seat?

Being able to adjust your seat is important for comfort, but it’s also essential for driving safely. You need to be able to adjust the seat so that you can reach the steering wheel and pedals easily, as well as...

My car turns off when driving or if left running it will turn off while idle.

A few different things will usually cause the vehicle to start and then die. A bad ignition coil can cause this if it is beginning to fail, resulting in intermittent starting problems. A dirty or faulty mass air flow sensor,...

Related articles

The Best Used Cars to Buy If You’re a Realtor or Real Estate Agent
If If you make your living as a realtor or real estate agent, you may have a number of considerations when it comes to purchasing a used vehicle. The most common considerations are budget, ability to transport people, and comfort....
A Buyer’s Guide to the 2012 Honda Fit
The The 2012 Honda Fit is a fuel efficient car that has lots of head and legroom for drivers and passengers alike. In addition, its five door configuration holds large items like skis, bikes, and surfboards for those who love...
2012 Toyota Corolla vs. 2012 Honda Civic: Which One Should I Buy?
Compact cars are the unsung heroes, slightly larger than a subcompact, but not quite big enough to be classified as a mid-size sedan. These vehicles have a small wheelbase of no longer than 109 inches with between 100 and 109...