Lolo25 Posted January 10, 2019 Share Posted January 10, 2019 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 Quote Link to comment Share on other sites More sharing options...
JimCost2014 Posted January 10, 2019 Share Posted January 10, 2019 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. 1 Quote Link to comment Share on other sites More sharing options...
HeySkippyDog Posted January 10, 2019 Share Posted January 10, 2019 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.Sent from my SAMSUNG-SM-J727A using Tapatalk Quote Link to comment Share on other sites More sharing options...
Lolo25 Posted January 10, 2019 Author Share Posted January 10, 2019 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 Quote Link to comment Share on other sites More sharing options...
Lolo25 Posted January 10, 2019 Author Share Posted January 10, 2019 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 . Quote Link to comment Share on other sites More sharing options...
JimCost2014 Posted January 10, 2019 Share Posted January 10, 2019 (edited) 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 Quote Link to comment Share on other sites More sharing options...
HeySkippyDog Posted January 10, 2019 Share Posted January 10, 2019 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.Sent from my SAMSUNG-SM-J727A using Tapatalk 1 Quote Link to comment Share on other sites More sharing options...
Lolo25 Posted January 10, 2019 Author Share Posted January 10, 2019 Yea i will just do t ha e the found to take to a dealer .. Need question anyboday with issues lime this . Thanks Quote Link to comment Share on other sites More sharing options...
Lolo25 Posted January 10, 2019 Author Share Posted January 10, 2019 I will swap them out and see the change. Thanks for all the replys Quote Link to comment Share on other sites More sharing options...
14GMCZ71 Posted January 10, 2019 Share Posted January 10, 2019 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 Quote Link to comment Share on other sites More sharing options...
Lolo25 Posted January 11, 2019 Author Share Posted January 11, 2019 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 Quote Link to comment Share on other sites More sharing options...
JimCost2014 Posted January 12, 2019 Share Posted January 12, 2019 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? Quote Link to comment Share on other sites More sharing options...
Lolo25 Posted January 12, 2019 Author Share Posted January 12, 2019 If has just about 100k Quote Link to comment Share on other sites More sharing options...
JimCost2014 Posted January 12, 2019 Share Posted January 12, 2019 16 minutes ago, Lolo25 said: If has just about 100k Do you know if it has ever been serviced, fluid change? Quote Link to comment Share on other sites More sharing options...
Lolo25 Posted January 13, 2019 Author Share Posted January 13, 2019 Yes it has first service was done 50k .. Second was done at 95k .. Quote Link to comment Share on other sites More sharing options...
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