First off, this is my first post on this site. I have been a life time Chevy owner, all Extended cab 4x4's and Trailblazeers for my wife. This is the first Tahoe I've owned, I bought it while in Dallas, TX for a winter vehicle here in Ohio.
I love the room and the way it handles, I bought it with 146k on the OD expecting to put a new transmission in. It now has 156k, I had an upgraded tranny installed a couple of weeks ago when I lost Rev, 2nd and 4th gear.
I started driving it again and noticed a "miss" after leaving it at the airport for a business trip (I had topped off the fuel tank before I left). When I returned home I noticed it running rough on start up at idle and it stumbled under acceleration. It runs fine once it is warmed up but had a miss while sitting at idle. I thought it might have been bad gas.
Yesterday I stopped by the parts store and had them hook up the code reader. It was showing a miss on # 6 cyl. I bought all new plugs and wires and two cans of Seafoam (after reading here). I ran the Seafoam through the PCV last night and other than some grey smoke it didn't seem to do much.
I started changing out the plugs today. For some reason number 6 cyl was hard to remove (rust) where the others came out easy. Also, it had a different plug in that cyl., AC Delco 41-993 / 12607234 instead of the Ac Delco 41-993 / 19256067.
Could this be the problem? Is this a hotter or cooler plug? If there was a problem in the past, why would this plug have helped?
This vehicle has run great up until the transmission problem and I bought it at a fair enough price and great condition. I am not afraid to put some money into it, I just want it reliable.
I came in to check on what torque setting to use on the plugs and thought I'd post the question. I am heading back out to finish changing the plugs and wires, I hope this resolves the issue. I will update this thread with the initial results.
Thanks in advance for any input,
cgs500
I love the room and the way it handles, I bought it with 146k on the OD expecting to put a new transmission in. It now has 156k, I had an upgraded tranny installed a couple of weeks ago when I lost Rev, 2nd and 4th gear.
I started driving it again and noticed a "miss" after leaving it at the airport for a business trip (I had topped off the fuel tank before I left). When I returned home I noticed it running rough on start up at idle and it stumbled under acceleration. It runs fine once it is warmed up but had a miss while sitting at idle. I thought it might have been bad gas.
Yesterday I stopped by the parts store and had them hook up the code reader. It was showing a miss on # 6 cyl. I bought all new plugs and wires and two cans of Seafoam (after reading here). I ran the Seafoam through the PCV last night and other than some grey smoke it didn't seem to do much.
I started changing out the plugs today. For some reason number 6 cyl was hard to remove (rust) where the others came out easy. Also, it had a different plug in that cyl., AC Delco 41-993 / 12607234 instead of the Ac Delco 41-993 / 19256067.
Could this be the problem? Is this a hotter or cooler plug? If there was a problem in the past, why would this plug have helped?
This vehicle has run great up until the transmission problem and I bought it at a fair enough price and great condition. I am not afraid to put some money into it, I just want it reliable.
I came in to check on what torque setting to use on the plugs and thought I'd post the question. I am heading back out to finish changing the plugs and wires, I hope this resolves the issue. I will update this thread with the initial results.
Thanks in advance for any input,
cgs500
Last edited:
one part number is probably just a replacement part number. They ac-delco number is the same. If anything I say a previous service work did not think it would come out with doing damage so it was left in there when others were done. It might just be over aged by now.
