Q: Misfiring after replacing plugs and coils in 05 F150
After replacing the plugs and coils for maintenance, the truck misfires and doesn't idle correctly. We replaced all 8 plugs with motocrafts and all 8 powerpack coils. Truck ran perfect before the replacement but now won't idle and shakes horribly. Help me please.
My car has 125000 miles.
My car has an automatic transmission.
Recommended Services
| Spark Plugs Replacement | $113.11 - $716.47 | Get a Quote |
I would recommend starting with re-checking all of the plug wires to be sure they are properly connected. Misfiring and shaking may indicate that one or ore of them may not be firing due to an improper connection. If this does not solve the problem, you may also want to pull the spark plugs out to be sure they are properly gapped. In incorrect spark plug gap may also cause a misfire due to an irregular flash as it fires.
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
Oil leaking
Hi there. The engine, transmission, and power steering system all use an oil type fluid and the systems are prone to leaks, especially in the case of poor maintenance. If you need further assistance, I recommend you have a certified...
Opinion about Tesla
They are fast as lightning cars. I just met a guy who has one, and I was talking to him about the car and we gave it a ride. They are zippy, fast cars but they are pretty expensive. He...
Random misfire - 2004 Chevy Express 2500
Hello. Most of the time if you have a multiple cylinder misfire such as this, it is caused by a fuel system problem. If the fuel pressure is low, then this will occur. If the fuel pressure is fine, then...
Car jerks and slows down
Hey there. This may be a sign of a dirty or failing mass air flow sensor (https://www.yourmechanic.com/services/mass-airflow-sensor-replacement). The mass air flow sensor is a unit in the intake system that monitors air intake as it is mixed with fuel prior...
Dodge Challenger bolt pattern.
Hello. The stock bolt pattern for the Dodge Challenger is 5 x 115mm, 5 lug wheel with a medium offset. Using wheels with any other bolt pattern or too high or low of offset may result in improper fitment or...
Car struggles to accelerate
This may be a sign of a clogged catalytic converter. As you may already know, the catalytic converter converts toxic exhaust gases into less harmful pollutants that are suitable to be expelled into the atmosphere. When this is clogged, this...
On a 2008 enclave there is a p0018 code. How do you know if it's a failed sensor or timing chain?
Hi there. Locate the crankshaft position sensor and check for power to it with the key on. If there is power, then with using a paper clip to back probe the wiring with the plug installed on the sensor, check...
Rough idle when cold
Hello, As a general rule, car engines do not like cold weather and will generally require more fuel in cold operating temperatures. When you start your car in the morning and turn the key to on, the coolant temperature sensor...
What will happen when a Ford ecm diode goes bad?
The PCM power diode is put into the fuel pump and PCM relay power circuit to prevent power surge feedback into the circuit called flyback voltage then can be higher than normal operating voltage. The computer may get flyback voltage...
Related articles
A Buyer’s Guide to the 2012 Ford Focus Electric
In In 2012, the Ford Focus Electric model went a step farther than other eco-friendly cars. Instead of creating another hybrid model, Ford chose to offer a fully electric vehicle with a very impressive range of 76 city miles and...
The Top 5 Selling Cars in Kansas in 2012
Kansas Kansas sees a varied climate with all four seasons, which means drivers in the area choose a variety of vehicles. In years past, some of the front-runners have included the Ford F-150, Buick and Toyota Camry. 2012’s top five...
Ford Certified Pre-Owned (CPO) Car Program
Drivers Drivers in the market for a used Ford vehicle 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 to learn...
Browse other content
Maintenance
Estimates
Services