Chevy Colorado & GMC Canyon banner
Cancel

2015 Colorado z71 65,500 miles.. Spark knock last 200miles..switched to premium 93 spark knock/ping gone .. ??

1546 Views 4 Replies 3 Participants Last post by  Medic55, 
M
I just dropped of my Colorado at the dealer.. I've noticed the last few hundred miles I was getting a loud pinging/rattle metallic sound that I kept thinking was a headshield. I checked every inch of all the heatshields and they were all tight. Its gotten so loud that I can hear it over the radio now. I put in premium gas 93 and within the first 30min of driving with primum the rattle sound disappeared. Also I've noticed my gas mileage has gone up 6-7 mpg since adding primum. I found a bulletin about a ECM TCM update so I printed it out for the dealership. Unfortunately its out of warranty now. Has anyone here had the same problem and has the ECM update fixed your issue?
Reply
Save
Like
1 - 5 of 5 Posts
Tom S.
You have a 5 year 60K mile warranty on the engine, so even if you're a little past, the dealer / GM may cover this in whole or part. Talk to them.
Reply
Save
Like
2017Z71
The premium gas is probably masking a problem with a sensor going bad. (MAF, O2, knock, IAT)
Reply
Save
Like
M
So I picked up my truck and they did a PIP5303 update on the ECM/TCM. One the issues noted on that bulletin was spark knock. Once driving off the lot I couldn't believe how different the truck responds now. It is so much more responsive and has so much more pick up. When entering the highway from the onramp I used to have to really step on the gas or It was like it was stuck into low of a gear I just assumed that was normal I guess. I still have primum in there now so I wont know if this fixed the engine ping/spark knock until my next fill up.
Reply
Save
Like
M
Although the truck is driving so much better. I just filled up with 87 and the spark knock/engine ping came right back. Anything I can try before bringing it back to the dealer? It’s out of warranty and it’s going to cost me a fortune I can imagine. I put my scanner on and no codes or stored codes.
Reply
Save
Like
1 - 5 of 5 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Chevy Colorado & GMC Canyon
ColoradoFans.com is the best forum for the Chevy Colorado community to discuss the truck’s reliability, diesel or transmissions problems and more.
Full Forum Listing
Explore Our Forums
General Truck Chat 2nd Gen Chevrolet Colorado Forum / 2015 GMC Canyon Technical Questions / Tips / How To 2nd Gen Engines and Technical Discussion 2nd Gen Electronics, Audio, and Lighting
Top