1998 C1500 5.7 Misfiring Rough Idle

[anotherwagner]

I was driving down the interstate and sped up to pass a car once I started to slow down the CES light came on and the truck started to shutter really bad. I got it to a scanner and it said misfire Cylinder 6 and he suggested that i change the cap rotor plugs and wires since it has been a long time since it had been done. I did so and and the problem has continues. It idles real rough acts like it is going to die, then under power it smooths out a little but you can still tell it it where. Above 3000 the CES blinks until you slow down and the the scanner still says misfire cylinder 6. Any suggestions.

[MT-2500]

Originally Posted by anotherwagner

i was driving down the interstate and sped up to pass a car once i started to slow down the ces light came on and the truck started to shutter really bad. I got it to a scanner and it said misfire cylinder 6 and he suggested that i change the cap rotor plugs and wires since it has been a long time since it had been done. I did so and and the problem has continues. It idles real rough acts like it is going to die, then under power it smooths out a little but you can still tell it it where. Above 3000 the ces blinks until you slow down and the the scanner still says misfire cylinder 6. Any suggestions.

check compression and check for vacumn leaks or stuck egr valve.

[Schurkey]

Originally Posted by anotherwagner

I got it to a scanner and it said misfire Cylinder 6 and he suggested that i change the cap rotor plugs and wires since it has been a long time since it had been done. I did so and and the problem has continues.

Find another technician; someone who, when told the problem is on Cylinder 6, doesn't try to fix it on cylinders 1 through 5, and 7 & 8.

[j cAT]

Originally Posted by anotherwagner

I was driving down the interstate and sped up to pass a car once I started to slow down the CES light came on and the truck started to shutter really bad. I got it to a scanner and it said misfire Cylinder 6 and he suggested that i change the cap rotor plugs and wires since it has been a long time since it had been done. I did so and and the problem has continues. It idles real rough acts like it is going to die, then under power it smooths out a little but you can still tell it it where. Above 3000 the CES blinks until you slow down and the the scanner still says misfire cylinder 6. Any suggestions.

the valve springs. check compression. not uncommon.

[dirtautoguy12]

This is just something simple but also check that the spark plug wire to cylinder 6 is tight. And that the dist. Cap is tight too. Although usually if it's the cap or rotor it's multiple cylinders.