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Hummer H2For those who like a little more gleam to their Hummer, the H2 offers a similar rugged look as the H1, but as a lower cost, and with more added features, making it almost a massive luxury SUV.
Have you watched the fuel pressure while driving? Take out the two upstream 02 sensors and test drive it to see if the open sensor holes will restore your lost power.. If so ,your catalytic converters might be plugged.
Thanks again guys! I have done everything as per your advice and still the same.
The only thing I have noticed is that my H2 seems to dramatically improve every time I unplug the - battery. As a matter of fact, both times I have previously replaced the KS, the H2 drove great at first. Coincidence??
Any idea why unplugging the battery helps my KS nightmare??
I left it disconnected for a few hours this afternoon and then drove it for just a few miles. Great throttle response and power but, as it has happened before, I’m pretty sure it won’t last very long.
I will try to get it diagnosed with a tech2 because my obd scanner seems to not cut it.
When you disconnect the battery for a bit all of the learned long term fuel trims as well as a few other things get reset in the ECU tune....
Exactly! So the long term parameters learned by the ECU are messing things up. Hence it might be indeed a tune issue? I guess the current tune, that the ecu is reading after each “reset”, is what is causing all the performance issues. Or... the the tune is in ECU itself?
The tune is in the ecu itself. I doubt the tune itself is the problem but I guess that is possible if someone put a custom tune on it at some point that was adjusted for some performance accessory that is no longer installed. I think more likely is some sensors data is not reaching the ecu or it is giving a way out of range value and the ecu is overcompensating for it. Probably need to get a Tech 2 connected and start looking at sensor values to make sure the various sensors are all within spec on the range they are reporting. A bunch of them on the vehicle like MAF, IAT, TPS, CPS (cam and crank position). Just one of those tough ones to diagnose.... could even be a ground for one of the sensors is poor, voltage issues, fuel pressure, intake leak, etc.
Thanks again guys! I have done everything as per your advice and still the same.
The only thing I have noticed is that my H2 seems to dramatically improve every time I unplug the - battery. As a matter of fact, both times I have previously replaced the KS, the H2 drove great at first. Coincidence??
Any idea why unplugging the battery helps my KS nightmare??
I left it disconnected for a few hours this afternoon and then drove it for just a few miles. Great throttle response and power but, as it has happened before, I’m pretty sure it won’t last very long.
I will try to get it diagnosed with a tech2 because my obd scanner seems to not cut it.
this is happening to me …..exactly the same thing...….you have to let off the pedal to accelerate, stomp it to the floor and it will hardly move, has trouble shifting, knock sensor code thrown...….disconnect the battery and it runs like perfectly until it does it again randomly …..a day later, a week later , whenever …..same thing everytime
12-14-2018, 08:26 AM
