Engine missfiring but no check engine light
11-28-2018, 10:20 AM
#1
Member
Thread Starter
Engine missfiring but no check engine light
Howdy y'all.
I have a question. 2 weeks ago my truck started cutting out and miss firing on my way home. I figured it was the spark plugs because it was getting close to 50K miles on the ones that I had in there. I pulled over and had my wife bring me my tools and some new plugs. I changed the 4 passenger plugs and got too cold to try and do the other 4 I figured I had 50% chance of getting the bad plug. Started the truck up and it sounded great. So I drove it home so I could warm up and then do the other 4 plugs. As I started speeding up to go down the high way it started cutting out again and since I was still 45 minutes from home I limped it there. I changed the other 4 plugs and one of the tabs on one coil pack broke on me so I bought a new coil pack. I have now changed that coil pack. Monday the truck rand great, Tuesday morning it rand great and lunch time it started cutting out again, and it did it again on my way home Tuesday, and now to today it cut out some at low speeds and ran great at 70 to 75 mph. I have no codes being shown but a buddy of mine plugged up his reader and wasn't calibrated for 2001 F150 but it said exhaust heater sensor bank 3 and bank 4 malfunction.
So my question is do you think that it could be my O2 sensors going out? Or is it something else. Thank you
I have a question. 2 weeks ago my truck started cutting out and miss firing on my way home. I figured it was the spark plugs because it was getting close to 50K miles on the ones that I had in there. I pulled over and had my wife bring me my tools and some new plugs. I changed the 4 passenger plugs and got too cold to try and do the other 4 I figured I had 50% chance of getting the bad plug. Started the truck up and it sounded great. So I drove it home so I could warm up and then do the other 4 plugs. As I started speeding up to go down the high way it started cutting out again and since I was still 45 minutes from home I limped it there. I changed the other 4 plugs and one of the tabs on one coil pack broke on me so I bought a new coil pack. I have now changed that coil pack. Monday the truck rand great, Tuesday morning it rand great and lunch time it started cutting out again, and it did it again on my way home Tuesday, and now to today it cut out some at low speeds and ran great at 70 to 75 mph. I have no codes being shown but a buddy of mine plugged up his reader and wasn't calibrated for 2001 F150 but it said exhaust heater sensor bank 3 and bank 4 malfunction.
So my question is do you think that it could be my O2 sensors going out? Or is it something else. Thank you
11-28-2018, 11:17 AM
#2
Senior Member
I'm going to say it's probably the coils.
Last edited by JCR 56; 11-29-2018 at 03:36 PM.
11-28-2018, 12:20 PM
#6
Senior Member
Yep coils, stick with Motorcraft plugs and either Motorcraft or Denso coils (only) and that problem with be a thing of the past.
Trending Topics
11-28-2018, 12:42 PM
#8
Senior Member
Replaced the coils with what coils? Plugs with what plugs? It does make a difference as Brew posted already.
11-28-2018, 04:29 PM
#10
Senior Member
