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misfire

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Chevrolet Forums >> Chevy Trucks, Vans & SUV's >> Silverado >> misfire

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misfire - 4/22/2007 5:40:16 PM

slvrpny

Posts: 3
Joined: 4/22/2007
Status: offline

03 1500HD crew 75,000 highway miles. Engine warning light comes on at 65mph and above goes off below 65. The code says misfire on #1 and #6. The truck has new plugs/wires the dealer checked the coils,injectors and sensors. The dealer suspects carbon build up on valves and the only way to confirm this is with a $600.00 tear down and then a $2000.00 plus valve job to fix the problem. I know there is an induction cleaner but the dealer doubts that it will work. What if I don't fix it? I burn quality fuel ( BP and Mobil) use full synthetic oil there is no reason I should be doing major engine work at 75,000 miles. Any other options? Thanks in advance.

Post #: 1

RE: misfire - 4/22/2007 5:59:37 PM

matador

Posts: 110
Joined: 7/5/2006
Status: offline

Is this a diesel?

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Matador

2006 Chevy Silverado Z71 5.3 4x4

(in reply to slvrpny)

Post #: 2

RE: misfire - 4/22/2007 6:39:16 PM

slvrpny

Posts: 3
Joined: 4/22/2007
Status: offline

Sorry 6.0 liter gas.

(in reply to matador)

Post #: 3

RE: misfire - 4/22/2007 7:29:15 PM

Hippie

Posts: 2
Joined: 4/22/2007
Status: offline

is there just a miss fire when cold or hot the 5.3 &6.0 have intake leak problems leaking vacuum causing
miss fire codes

(in reply to slvrpny)

Post #: 4

RE: misfire - 4/22/2007 9:56:38 PM

sm3earl

Posts: 152
Joined: 2/6/2007
Status: offline

Are you using crappy gas, IE arco, discount gas? because those cause lots of carbon to build up.

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-Shawn

2000 Chevy Silverado ext. cab 5.3L

(in reply to Hippie)

Post #: 5

RE: misfire - 4/22/2007 10:05:56 PM

slvrpny

Posts: 3
Joined: 4/22/2007
Status: offline

Only quality fuel (BP or Mobil). Light only flashes at 65 and above engine is hot. I don't know the codes but I'll find out.

(in reply to sm3earl)

Post #: 6

RE: misfire - 7/9/2007 12:43:43 PM

MCOLLINS72022

Posts: 1
Joined: 7/9/2007
Status: offline

so how do you know if you have a intake leak i have a 2004 2500hd with a 6.0liter in it and I am have a lean code po171 and p0300 random misfire code the frist thing i thougth was vac. leaks but did not find any. does any one have any ideas?

(in reply to slvrpny)

Post #: 7

RE: misfire - 7/9/2007 12:48:05 PM

sm3earl

Posts: 152
Joined: 2/6/2007
Status: offline

MCOLLINS72022,

Start a new post for more feedback.

_____________________________

-Shawn

2000 Chevy Silverado ext. cab 5.3L

(in reply to MCOLLINS72022)

Post #: 8

RE: misfire - 7/10/2007 7:08:51 PM

cj23

Posts: 19
Joined: 11/29/2006
Status: offline

Had same problem at about 70mph code read misfire change injectors on cylinder with the misfire no more problem. Since I know how to do it that's why I did mine's you may want to try a injector flush first.

(in reply to sm3earl)

Post #: 9