SnowDrifter
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- Joined
- Sep 5, 2016
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In a bit of a bind here. I'm off at school, away from all my tools except for this POS tuner that has very basic live data and code read function.
300 mile drive, all was good until 250 miles in. Had an occasional stumble every 5 minutes. Almost felt like thre torque converter locking/unlocking HARD. Checked tranny fluid level and ran through the gears, found no issues. Later on the issue seemed to reveal itself as an engine issue and not a trans issue
So I continue on my drive, it happens more and more often. In playing around, I put my foot to the floor, tranny selected the right gear, then I got no power and some RPM fluctuations.
I set some live data in my tuner to view MAP, MAF, TPS%, and total misfire count. Right when it cuts out, I get 1 or 2 misfires, then nothing. It idles OK, I didn't see anything odd in the live data. It just acts like a ***** when I try to give it gas, even in gentle driving. The issue got worse and worse as I drove.
As a quick update test, I unplugged the maf. No change.
Vehicle is a 2005 tahoe 5.3 gas, 116k. all maintenance up to date. Air filter/plugs/wires/trans fluid/filter/intake gaskets/knock sensors were done 4000 miles ago.
At the onset of trying issue, I noticed some spark retard but now that it's really bad, not any more. My little too doesn't have a graph function or appropriate refresh rate to see what the O2 sensors do when the stumale occurs. Fuel trims at idle look ok, however they jump to between 30 and 50 under load
If I turn off the ignition for 5 mins. The problem gets better for or a short period of time before it comes back.
Now since I'm away from all my diag equipment and tools it's a little difficult for me to do anything with this. I'm leaning towards fuel pump. Any ideas on things I can check? I'm a bit limited here as I'm away from all my diagnostic tools. Or barring all else, are there any reputable shops/people in Pullman WA?
See here for a snippet off the issue. It seems to be load dependent, not speed dependent. Doesn't matter what gear the transmission is in. Doesn't matter if I'm going 75(which I can only get to going down hill now) or 10mph. If I hit the gas, it does this. If I press the gas more, it goes from surging to just about nothing. The transmission will select the proper gear, then the engine doesn't chooch.
300 mile drive, all was good until 250 miles in. Had an occasional stumble every 5 minutes. Almost felt like thre torque converter locking/unlocking HARD. Checked tranny fluid level and ran through the gears, found no issues. Later on the issue seemed to reveal itself as an engine issue and not a trans issue
So I continue on my drive, it happens more and more often. In playing around, I put my foot to the floor, tranny selected the right gear, then I got no power and some RPM fluctuations.
I set some live data in my tuner to view MAP, MAF, TPS%, and total misfire count. Right when it cuts out, I get 1 or 2 misfires, then nothing. It idles OK, I didn't see anything odd in the live data. It just acts like a ***** when I try to give it gas, even in gentle driving. The issue got worse and worse as I drove.
As a quick update test, I unplugged the maf. No change.
Vehicle is a 2005 tahoe 5.3 gas, 116k. all maintenance up to date. Air filter/plugs/wires/trans fluid/filter/intake gaskets/knock sensors were done 4000 miles ago.
At the onset of trying issue, I noticed some spark retard but now that it's really bad, not any more. My little too doesn't have a graph function or appropriate refresh rate to see what the O2 sensors do when the stumale occurs. Fuel trims at idle look ok, however they jump to between 30 and 50 under load
If I turn off the ignition for 5 mins. The problem gets better for or a short period of time before it comes back.
Now since I'm away from all my diag equipment and tools it's a little difficult for me to do anything with this. I'm leaning towards fuel pump. Any ideas on things I can check? I'm a bit limited here as I'm away from all my diagnostic tools. Or barring all else, are there any reputable shops/people in Pullman WA?
See here for a snippet off the issue. It seems to be load dependent, not speed dependent. Doesn't matter what gear the transmission is in. Doesn't matter if I'm going 75(which I can only get to going down hill now) or 10mph. If I hit the gas, it does this. If I press the gas more, it goes from surging to just about nothing. The transmission will select the proper gear, then the engine doesn't chooch.