2014 1500 silverado 5.3

[Lolo25]

Hello i had just put up a post ..on 2014 silverado hasitation hard shifting seems like miss fire smothly pressing on the peddle hasitation at 70 75mph 

Also at varies at difrent speed

first code p0308 came up ..

 

Replaced coil and spark plugs 

Truck has abput 100k on it.

Need some help on trouble shooting the problem 

I repostes this up againg new to the forum dont knw how to work this 

[JimCost2014]

21 minutes ago, Lolo25 said:

Hello i had just put up a post ..on 2014 silverado hasitation hard shifting seems like miss fire smothly pressing on the peddle hasitation at 70 75mph 

Also at varies at difrent speed

first code p0308 came up ..

 

Replaced coil and spark plugs 

Truck has abput 100k on it.

Need some help on trouble shooting the problem 

I repostes this up againg new to the forum dont knw how to work this 

Did you replace the plug wire? You have a misfire on cylinder #8. 

[HeySkippyDog]

The code indicates an ignition problem on cylinder #8. You say you replaced the coil pack and the plug.

1. Are you certain you replaced the parts for the #8 cylinder?
2. You did not mention whether you changed your plug wire or not. Try swapping wires with another cylinder's wire (at both ends, not just one) and see if the problem follows where the #8 wire went.

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[Lolo25]

Thatnks for the reply and no i ha e not replaced the wire on #8 

I had the #8 just cleard code 

Check inguine light haven't poped up yet 

But sure can fill the hesitation and hard down shifting or shifting on #2.3 and speed vearies 

[Lolo25]

No i di t not changed the spark plug wored but yes did reply the spark plugs a around..

 

Yes did replced coil on #8

Still having same problem othere thing i can think of could be injector .

 

[JimCost2014]

7 minutes ago, Lolo25 said:

Thatnks for the reply and no i ha e not replaced the wire on #8 

I had the #8 just cleard code 

Check inguine light haven't poped up yet 

But sure can fill the hesitation and hard down shifting or shifting on #2.3 and speed vearies 

I would get it checked out soon, driving with a misfire can destroy your catalytic converters very quickly. 

Edited January 10, 2019 by JimCost2014

[HeySkippyDog]

Try swapping wires over from another cylinder. Let us know if the issue follows to the cylinder with the suspect wire. If it does, you need a new plug wire for #8.

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[Lolo25]

Yea i will just do t ha e the found to take to a dealer ..

 

Need question anyboday with issues lime this .

Thanks 

[Lolo25]

I will swap them out and see the change.

Thanks for all the replys 

[14GMCZ71]

Also check to see if the following recalls have been performed on your '14:    ( Don't know if all of these are applicable to your VIN or will help your current situation - I'm going off my '14 GMC. )

 

14192 - Reprogram Transfer Case

 

15304 - Reprogram Transfer Case Module

 

 

[Lolo25]

Hell guys tha thanx for that help narrowing down my problems no more check ingine hasitation and hard shifting on 2/3 gear .are still there ..been srinving in manuel mode once shifting in to third i get lac of powere high rpms 

 

Which makes me think is the trasmission starting to sleep on does gears every othere gear is smoth no problem at all 

 

Code p0308 no longer stored or light coming on did replaced thay specific coil witch took away the problem 

 

Will be taking it to a transmission specialist for this 

 

Thanks everyone. For them opinions/help

 

 

[JimCost2014]

7 hours ago, Lolo25 said:

Hell guys tha thanx for that help narrowing down my problems no more check ingine hasitation and hard shifting on 2/3 gear .are still there ..been srinving in manuel mode once shifting in to third i get lac of powere high rpms 

 

Which makes me think is the trasmission starting to sleep on does gears every othere gear is smoth no problem at all 

 

Code p0308 no longer stored or light coming on did replaced thay specific coil witch took away the problem 

 

Will be taking it to a transmission specialist for this 

 

Thanks everyone. For them opinions/help

 

 

Good luck, glad to hear one of the problems has been solved. How many miles on the truck?

[Lolo25]

If has just about 100k 

[JimCost2014]

16 minutes ago, Lolo25 said:

If has just about 100k 

Do you know if it has ever been serviced, fluid change?

[Lolo25]

Yes it has first service was done 50k ..

Second was done at 95k ..