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  #1  
Old 12-20-2017, 01:29 PM
Chris1019 Chris1019 is offline
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Default Evap emissions

I recently did a tune up and replaced tje fuel pump on my 2001 silverado witj tje 5.3 liter engine. At the same time i pulled a code for evaporative emissions. After the parts were replaced i still got this code and now occasionally a random cylinder misfire that i can feel. Would this system cause the misfire or are my coils going bad?
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Old 12-20-2017, 06:25 PM
zora zora is offline
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Default Re: Evap emissions

the evap code doesnt cause a misfire, you didnt list the code but typically replacing the gas cap is the first thing on the list for the evap code.
A misfire should give you another code, have you scanned again?
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Old 12-21-2017, 08:20 AM
Chris1019 Chris1019 is offline
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Default Re: Evap emissions

I got code 440 and later code 300. It doesn't come up all the time but I can feel a misfire as put my foot into the accelerator.
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Old 12-21-2017, 10:05 AM
zora zora is offline
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Default Re: Evap emissions

the p0300 indicates all cylinders are misfiring. The link below gives you a number of items to check.
Did you dislodge a vacuum hose or electrical connector when you did the tune up?
If you replaced spark plugs did you install the correct ones and gap them?

https://www.obd-codes.com/p0300
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