[OCCAMSRAZOR32]

So my Dak. is throwing 3 codes, 1 = cyl 1 misfire, 2 = cyl 7 misfire, and 3 = random/ multi misfire. I dont know what is causing it. Changed plugs and wires about 2k ago and checked to see if I got spark and all is good. Changed cap and rotor 100 miles ago and it was happening before I changed that. Only thing I could think is bad injector. Any help would be great, thanks guys.

 

[Little Blue Guy]

Low fuel pressure, vacuum leak, I doubt 2 injectors would fail exactly the same time....bad O2 will sometimes cause this.....any number of things could be wrong....get someone with a scanner and look at data stream....don't go blindly throwing parts at it...will cost you more in the long run

 

[OCCAMSRAZOR32]

Yeah I think thats what were going to do. It starts to shake bad, lol.

 

[99Dakota]

the misfire is on the same side of the motor. the P0300 is because there is more then 1 misfire.

the 318 and 360 motors are known for bad heads which could cause this. try doing a compression test on those cylinder. then do a leak down test.

 

[Little Blue Guy]

Plugged cat will do this also...we had one where it affected all 4 cylinders on the same side.....just another option

 

[OCCAMSRAZOR32]

Alright, thanks for the help guys. Its super annoying!

 

[Little Blue Guy]

Alright, thanks for the help guys. Its super annoying!

If you don't get it fixed, it will destroy the cat converter

 

[ThisOldDak]

plugged cat? was that on a milti-cat setup or single? 97s only have one cat as far as I know.

 

[Little Blue Guy]

Yea..it was multi cat...my bad

 

[ThisOldDak]

I think a leaking plemum under the intake can also cause misfires since it would suck up a bunch of oil. but usually more random than 2 specific cylinders.

Has the ignition coil ever been replaced?

 

[Little Blue Guy]

I think a leaking plemum under the intake can also cause misfires since it would suck up a bunch of oil. but usually more random than 2 specific cylinders.

Has the ignition coil ever been replaced?

Leaking gasket under the plenum would suck air causing a lean condition, and a misfire.

 

[rlhass]

i would pull your spark plugs and take a look for a lean condition, or oil soaked plug. This will give you a direction to start heading. If you suspect a leaky intake,.. try spraying some starting fluid around the intake and see if the idle picks up. This will let you know its a intake problem.,.. get a scanner and read live data,.. this will be the best way to know what direction to go.

 

[biggradak]

Plugged cat will do this also...we had one where it affected all 4 cylinders on the same side.....just another option

would this cause the truck to start hard and run like shit? im thinkin a plugged cat is my problem too but i dont want to just start throwin money i dont have into a new exhaust if it isnt. PM me if you think you can help