Q: Q: Cylinder 1 misfire

asked by on

Truck is new to me. It has a misfire on cyl 1. I decided to change plugs and noticed a plug wire was off. I replaced all plugs and made sure all my wires were on & it started real hard & idled worse. If I pull the wire that had previously been off it starts easy & idles like it used too. I don't know how long it had been driven with the wire off. Truck had been sitting awhile before I got it because of a knock which was a cracked flywheel. Please help

My car has 170000 miles.
My car has an automatic transmission.

Hi there. From the description you have provided, two things come to mind. One, a blown head gasket between cylinders #1 and #3. Two, an intake valve not sealing ie; broken valve spring, burnt valve. Providing spark to the number one cylinder, allows the combustion process to take place, which is affecting other cylinder performance. A compression test and cylinder leakage test would confirm this possibility. Proper diagnoses should be performed. I recommend having your vehicle’s #1 cylinder misfire be diagnosed and repaired by a certified technician, such as one from YourMechanic.

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
  1. Home
  2. Questions
  3. Q: Cylinder 1 misfire

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

Q: Code 1349 P

Hey there. Try having the compression checked for each cylinder. I have had experiences where this code pops up due to a lack of compression from a burned exhaust valve. Also, are you using the right fuel? Using inferior fuel...

Q: Loud noise coming front front end.

You should have the tire n the left front checked to see if it is wearing incorrect causing the humming noise. The alignment on the front may be out from a loose upper or lower control ball joints or bushings....

Q: 99 GMC Sonoma carbeurated or fuel injected

Hi There, The 1999 GMC Sonoma 4.3L V6 motor is a fuel injected motor that came with what is called a Central Sequential Fuel Injection (CSFI) system. In this application, there is one main fuel injector (called a MAXI injector)...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.