Q: Number #1 cylinder misfire?

asked by on

Hi, I have a 1999 ford crown Vic 4.6 .The #1 spark plug black with gas, I put new plug coil and new injector . 2miles later black and car smells gas. Someone told me it could be a bad Pcm but only the one plug, all the others are good. Help!
My car has an automatic transmission.

Hi there. As you already know, replacing components without proper diagnoses can expensive and time consuming without resolution. Assuming, the engine is mechanically sound, good cylinder compression and valve train properly opening and closing, circuit tests need to be performed. A pulsed electrical signal should be seen at the injector connector and ignition coil connector, during engine cranking. There are noid lights available for testing both signals. It is fairly common for the retaining tab on the coil connector to break, thus not securing the connection to the primary side of the ignition coil. I recommend having your vehicle’s #1 cylinder engine 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. Number #1 cylinder 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: off road rav4 vs honda crv both first gen or second gen which one would be more suited from the two brand

To answer your question requires field and performance data which to my knowledge has not been collected and published and thus does not exist. Some informal (non scientific) analyses have been published such as the one at this link. In...

Q: how do you shut off the door warning chime when door is open and truck ignition keyis in accessory on my 2003 Ford F-150

Instructions covering one common technique to disable the door chime are posted in this video. Note that this is an amateur video and thus does not include the steps in the factory service manual to disable the air bag which...

Q: My car is making a knocking noise and there's a fuel leak

Hi there. From the description you have given, there are apparently a combination of problems with your vehicle. The fuel leak needs to be addressed first, this is a safety concern. Not knowing the area of the fuel leak requires...

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...