My truck ran fine all day untill tonight, when I started it up, it was obvious that i was misfiring. I drove it around a little, hoping to get a code that would lead me to which cylinder it is but i never got a code. Any Suggestions?

Thanks!

 

keep driving it until you get a CEL. It will come up. Sometimes take a while.

 

Alright thanks...i drove about 20 miles total

 

A cel should eventually present itself. But if you want to try to pin point it immediately you can run the engine at idle while misfiring and one at a time unplug (the electrical connector) the coil over plug one cylinder at a time. Each time you unplug one, that cylinder is no longer firing which will make a noticeable change in the idle causing a misfire. If you come across one that doesn't change the way it is idling, that is most likely the bad coil, same goes for injectors. One at a time unplug... wait and see if it changes, if not then plug it back in and move onto the next...etc. Until you find the one/ones that don't change.

 

I agree. Mine felt like the motor was gonna die and fall out before the cel came on with one cylinder misfiring.

 

I'll guess your talking about a truck. Do you know what size engine ? It's that deal under the hood with the propeller in front of it. I can't tell from here.

 

Like jbrew said a little more info will help. Like engine size, year of vehicle, mileage, is it even a Ford?

 

lol

 

Ya it is a 1998 F-150 4.6L wth 69,000 miles on it

 

you oughta put that in your profile in the user cp menu so it shows up on every post, like mine does there on the right.

 

OK i have no clue as to what this could be... i still havent gotten any codes and I went through and unplugged every single plug, when I did that the engine's idle decreased and got worse. But it did that on every single plug! I discovered that the misfire gets much worde in drive, reverse, 2, and 1 but in park its still noticable, but not that bad. Also when i have it in gear and I listen closely to the engine there seems to be a slight rattle, almost sounds like a knock.

 

Well i recently did the gotts mod last friday, it started doing this tuesday evening. So the first thing i did was remove the mod. I thought i might have fouled something in the air intake so i cleaned maf and throttle body and nothing has changed. Any suggestions?
Grant

 

He did it! , -good deal.