pcm or tranny questions
#1
pcm or tranny questions
Hello Everyone,
It's been awhile since I've been here. I should have continued a previous post with all the things I've done but searched for 15 minutes or so and said the hell with it...lol
Anyway, basically I have the engine in good shape. I now believe most of my earlier issues were coming from the present problems. As I'm driving, I will feel hesitation while driving a constant speed. For a very long time, I assumed it was an engine issue. After kinda replacing most everything above the pistons and crank, I have decided that I have either a short in my "ecm" or "pcm" or, I have serious issues with my tranny. This is what it's doing...
Driving at a steady speed anywhere between 35 and 60, I have what seems to be a misfire. I'm almost certain it's not a misfire. I believe a ground short in the pcm that happens erratically or something about the tranny. Anyway when driving the issue happens and it seems like a miss but the tach rpm raises about 200 rpms every time you feel the so called miss. That's pretty much the problem. Any input would be appreciated.
Thank you
It's been awhile since I've been here. I should have continued a previous post with all the things I've done but searched for 15 minutes or so and said the hell with it...lol
Anyway, basically I have the engine in good shape. I now believe most of my earlier issues were coming from the present problems. As I'm driving, I will feel hesitation while driving a constant speed. For a very long time, I assumed it was an engine issue. After kinda replacing most everything above the pistons and crank, I have decided that I have either a short in my "ecm" or "pcm" or, I have serious issues with my tranny. This is what it's doing...
Driving at a steady speed anywhere between 35 and 60, I have what seems to be a misfire. I'm almost certain it's not a misfire. I believe a ground short in the pcm that happens erratically or something about the tranny. Anyway when driving the issue happens and it seems like a miss but the tach rpm raises about 200 rpms every time you feel the so called miss. That's pretty much the problem. Any input would be appreciated.
Thank you
#2
First, what year and mileage and are there any mod's to your Blazer. Second, any CES/ MIL codes and what are they? Third, when does this 'misfire' happen: When the engine is cold or fully warm? When driving on a level hwy or when driving up a hill?
#4
Hello Everyone,
It's been awhile since I've been here. I should have continued a previous post with all the things I've done but searched for 15 minutes or so and said the hell with it...lol
Anyway, basically I have the engine in good shape. I now believe most of my earlier issues were coming from the present problems. As I'm driving, I will feel hesitation while driving a constant speed. For a very long time, I assumed it was an engine issue. After kinda replacing most everything above the pistons and crank, I have decided that I have either a short in my "ecm" or "pcm" or, I have serious issues with my tranny. This is what it's doing...
Driving at a steady speed anywhere between 35 and 60, I have what seems to be a misfire. I'm almost certain it's not a misfire. I believe a ground short in the pcm that happens erratically or something about the tranny. Anyway when driving the issue happens and it seems like a miss but the tach rpm raises about 200 rpms every time you feel the so called miss. That's pretty much the problem. Any input would be appreciated.
Thank you
It's been awhile since I've been here. I should have continued a previous post with all the things I've done but searched for 15 minutes or so and said the hell with it...lol
Anyway, basically I have the engine in good shape. I now believe most of my earlier issues were coming from the present problems. As I'm driving, I will feel hesitation while driving a constant speed. For a very long time, I assumed it was an engine issue. After kinda replacing most everything above the pistons and crank, I have decided that I have either a short in my "ecm" or "pcm" or, I have serious issues with my tranny. This is what it's doing...
Driving at a steady speed anywhere between 35 and 60, I have what seems to be a misfire. I'm almost certain it's not a misfire. I believe a ground short in the pcm that happens erratically or something about the tranny. Anyway when driving the issue happens and it seems like a miss but the tach rpm raises about 200 rpms every time you feel the so called miss. That's pretty much the problem. Any input would be appreciated.
Thank you
Maybe pull the trans pan and take a look for material? When mine shelled there was so much material in the pan getting sucked up against the pickup that it would howl and start slipping. Stop and then would fall off and would move again for a little bit. Trans was rebuilt (again) and the problem disappeared, so I assume the "misfire" had something to do with the trans.
Last edited by LesMyer; 09-08-2017 at 01:38 PM.
#6
Well, I stated earlier that I was leaning toward the tranny for a fix but...The other afternoon I was preparing to pull out of the parking lot from work and started feeling the so-called misfire issue or transmission issue,(who knows) but I was sitting still.
I believe for everything I've already done to it, another 200 bucks for a computer might not be a bad choice.
Exactly how is this exchange done? I think you send it in with the vin number and the mileage. I also think I read somewhere about pulling a knock sensor. After everything has been exchanged and installed, will I still need to see a dealer for some kind of reset?
Btw, I've noticed when this issue is happening, my rpm jumps about 200 rpms for just a second. Sometimes my antilock brake light and my emergency brake light also come on for no apparent reason. Usually I'm running down the road about 45 mph.
Thanks
I believe for everything I've already done to it, another 200 bucks for a computer might not be a bad choice.
Exactly how is this exchange done? I think you send it in with the vin number and the mileage. I also think I read somewhere about pulling a knock sensor. After everything has been exchanged and installed, will I still need to see a dealer for some kind of reset?
Btw, I've noticed when this issue is happening, my rpm jumps about 200 rpms for just a second. Sometimes my antilock brake light and my emergency brake light also come on for no apparent reason. Usually I'm running down the road about 45 mph.
Thanks
Last edited by Graveyard; 09-15-2017 at 02:05 PM.
#7
Well, I stated earlier that I was leaning toward the tranny for a fix but...The other afternoon I was preparing to pull out of the parking lot from work and started feeling the so-called misfire issue or transmission issue,(who knows) but I was sitting still.
I believe for everything I've already done to it, another 200 bucks for a computer might not be a bad choice.
Exactly how is this exchange done? I think you send it in with the vin number and the mileage. I also think I read somewhere about pulling a knock sensor. After everything has been exchanged and installed, will I still need to see a dealer for some kind of reset?
Btw, I've noticed when this issue is happening, my rpm jumps about 200 rpms for just a second. Sometimes my antilock brake light and my emergency brake light also come on for no apparent reason. Usually I'm running down the road about 45 mph.
Thanks
I believe for everything I've already done to it, another 200 bucks for a computer might not be a bad choice.
Exactly how is this exchange done? I think you send it in with the vin number and the mileage. I also think I read somewhere about pulling a knock sensor. After everything has been exchanged and installed, will I still need to see a dealer for some kind of reset?
Btw, I've noticed when this issue is happening, my rpm jumps about 200 rpms for just a second. Sometimes my antilock brake light and my emergency brake light also come on for no apparent reason. Usually I'm running down the road about 45 mph.
Thanks
#8
Hey Les, how's it going?
Yeah, I saw a rebuilt for 129.00. I've already spent much more than that plus more labor than that would take to change out. I believe they had a 20% re-stock fee plus shipping but it would eliminate that at least.
Later
Yeah, I saw a rebuilt for 129.00. I've already spent much more than that plus more labor than that would take to change out. I believe they had a 20% re-stock fee plus shipping but it would eliminate that at least.
Later
#9
sounds like the same place I used. Nice people. Good luck.