Skip the auto shop - Our mechanics make house calls

Q: Car has a random misfire/jerking/hesitation only between 1200 and 1500 rpms, when it does misfire it does it 1 - 4 times

asked by on

Hello, I have a 2011 Nissan Altima 2.5 with 63400 miles. In the last 2 weeks it started to do a random mis/jerk/hesitation only one to four, not always, and this only happens between around 1200 to 1500 rpm. It seems to run fine at idle and at over 1500 rpm. I hooked up the computer to it and it reads “PASS” no error codes found. At first I thought it might be the transmission, I took it to the dealer, also got no error codes but said they tested the transmission further and told me it was not the transmission, that it was a coil going bad and they could not tell which one, suggested I keep driving the car until it got worse so they can find which coil was bad. I don’t know if to believe the dealer mechanic totally. Being that this problem is random and after learning a little more online, I think it might be vacuum related, not sure. Could you advise me on what could do this? Thank you, Mario

My car has 63400 miles.
My car has an automatic transmission.

A: The dealer could well be correct on this - ...

The dealer could well be correct on this - coils do go bad gradually sometimes, and "random misfire" is the common symptom. If the valve cover is leaking oil into the spark plug recess in the cylinder head, this can cause misfiring as well - the oil degrades the rubber boot over the plug, and provides an alternate current patch for the high voltage surge that creates a spark. I would recommend having your engine inspected for misfiring by a qualified technician, such as one from YourMechanic, to confirm there is a problem, get an accurate assessment of damage and cost estimate for 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: Won't crank.

Depending on if you overheated the engine and it still has the cracked radiator, then you may have more than one problem. You may have a problem with the crankshaft sensor if you are not getting spark. You said you...

Q: I replaced 2 spark plugs in cylinder 5 to fix a misfire.

Leaking valve covers on this engine allow oil down into the spark plug recesses as you note. Besides shorting the plug, the oil degrades the boot portion of the coil which plugs onto the spark plug, creating other opportunities for...

Q: Advice on buying a 4-wheel drive vehicle with minor and major repairs

Minor are the stuff like brakes, water pump leaking, radiator caps with holes in them - stuff that doesn't cost that much to fix and what you can easily do by yourself. But, if the transmission or the engine have...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...