Surging

[hippierick]

I am new to the forum and surging/shuttering problem that occurs at approx. 1500-1800 rpm; it feels as if you forgot to clutch a manual transmission car when letting off the gas. The car also falls on its face when at wide open throttle starting from a stop.

I have to date; replaced all coils with accel coil packs as someone else has posted, new plugs, and cleaned the MAF

The check engine light will come on after all codes have been cleared, and the code is misfire cylinder 6..........once again changed the coil pack and plug......still the same code.

I don't know????????? Any help is greatly appreciated.

 

[joegr]

How about just a little tiny bit of information about your LS? Believe it or not, they are not all the same.

Year?
V8 or V6?
Miles?

Did you check the electrical connector at injector #6?

What is the exact five character OBDII code that you are getting?

 

[hippierick]

Sorry about that..........

2003, V8, with 128K miles.

The connectors with broken clips have all been replaced, this includes cylinder #6.

Over the weekend the hesitation/surging is now ranging through the entire powerband; shaking at idle like a drag car with a moded cam.

I am not exactly sure what the exact code was, but the verable was "random cylinder misfire no. 6"

 

[WS6HUMMER]

Sorry about that..........

2003, V8, with 128K miles.

The connectors with broken clips have all been replaced, this includes cylinder #6.

Over the weekend the hesitation/surging is now ranging through the entire powerband; shaking at idle like a drag car with a moded cam.

I am not exactly sure what the exact code was, but the verable was "random cylinder misfire no. 6"

My wife's car is an 03 V8 with 110k on it. She has been telling me about how it would miss at times so I started swapping coils, changed the plugs, then tried a throttle body. The problem continued and got worse, eventually it started popping from the right side and would at times stall out and die. I discovered on the passengers side bank that the catalytic converter was melting and breaking up so I took out all 3 converters and the problem persisted. Since that bank got hot and melted the converter I new that it was not burning most of the fuel on that side of the engine so I thought the problem was in the timing. I pulled the valve covers today and found that the passengers side secondary tensioner had leaked down and wasn't even pushing on the timing chain. Pretty sure I found my problem, hope this helps.

 

[hippierick]

the problem.............one of the new motorcraft plugs was bad.