Q: Just replaced spark plugs and wires in my car and now it sputters at an idle in park.

asked by on October 16, 2016

Smells like it's burning rich, when I press the gas it sounds healthy, the rough idle I had before with the old plugs is gone, it seems to try and sputter, try and sputter, kind of like a Harley, but it doesn't give any check engine lights. The car is a 98 that was using a 97 distributor and spark plug wire set up. I called my dad and he told me to check the gaps, what else could it be if that's not it? How do I know the spark plugs are working properly?

My car has 220000 miles.
My car has an automatic transmission.

Engine is sputtering Inspection $94.99 - $114.99 Get a Quote

Hello and thank you for your question. To check the spark plugs, simply remove one spark plug at a time and place it on the ground somewhere away from the engine’s belts and away from the spark plug hole.

Start the engine and see the color of the spark. If there is a strong spark and it is blue, then the spark plug is good. Check all the plugs for the same symptoms. Then, get a spark plug tester and put it into the spark plug wire without the plug. Put it to ground with about 60 thousands (0.060 on the gauge) and see if there is a spark.

If no spark, then adjust the tool with rubber pliers and see when the spark will apply. If the spark starts to show up less than 30 thousands (0.030 on the gauge) then the coil is not producing enough power for the spark plugs and wires. I recommend having a professional, such as one from YourMechanic, check out the engine management system and determine why the engine is sputtering.

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


Experienced Mechanic?

Earn up to $70/hr

What others are asking

Car vibrates when stopping.
Your problem is a common one. The vibration/pulsation you feel when braking is possibly due to warped rotors. Rotors are a smooth machined metal surface that your brake pads make contact with when you apply your brakes. When the rotor...
Engine rebuild or swap.
If your RX does indeed need and engine then you will have options depending on if you want it rebuilt, or replaced with a new, rebuilt or new unit. All of these variations will have their own costs depending on...
Car clicks when starting
If there is a click when you try starting it then you need to see where the click is coming from. I typically start by checking to see if the clicking is coming from the starter. If the starter is...
Beep/alarm no longer work on key fob
I can think of two possible causes of this issue. One could be that the security system on your vehicle uses a separate siren from that of the horn and this siren has gone bad. The second possible cause of...
Grinding noise but not pads
Some common possibilities are a faulty outer CV joint on the axle (https://www.yourmechanic.com/services/axle-cv-shaft-assembly-replacement), a defective wheel bearing (https://www.yourmechanic.com/services/wheel-bearings-replacement), and/or interference between any rotating component (rotor, hub, etc) and fixed components such as the brake splash shield. There are other possibilities...
clutch pedal droppedto floor
There are a limited number of issues that can cause the clutch pedal to drop to the floor, and stay there. A failed clutch pressure plate, failed clutch master/slave cylinder, malfunctioning clutch pedal assembly, or having air in the clutch...
Running lean on bank 2
Hello and thanks for writing in. Code P0174 relates to a lean fuel condition which is typically caused by a faulty mass air flow sensor or potentially a vacuum leak beyond the mass air flow sensor causing the reading of...
My honda civic 96 won't start cause of the alarm. How can i take out an aftermarket alarm system and make it turn on again?
Hi there. You might want to read this article for starters (https://www.yourmechanic.com/article/how-to-disable-a-car-alarm). Since this is an aftermarket alarm system, you'll need to find the fuse that the system is installed and remove that for starters. Unfortunately, this is not a...
WHY WOULD I BE GETTING OIL IN MY INTAKE SYSTEM ON A 2016 FORD FUSION 1.5l TURBO
Many times on turbo engines if the PCV system is not working properly, the engine will get oil in the intake system. I would recommend having your vehicle inspected for a potential warranty repair with the PCV system on your...

Related articles

A Buyer’s Guide to the 2012 Subaru Forester
People People love SUVs, but more and more people have been looking for an alternative to the large models that suck up a lot of gas. One of the best options to consider is the Subaru Forester; it’s a great...
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...
Ten Sports Cars That Double as Good Daily Drivers
The best daily driver is a car that's reliable, usable, and still fun to drive. Popular daily sports cars include the BMW M3, Subaru WRX, and VW GTI.