Lurching and Hiccups

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BG1988

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Mine is at least daily.
HV battery worn out most likely run the engine for 10min But no more then 15 min (hood open in park watch RPM 600rpm when charging 500 when done....
 
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tiktok4321

tiktok4321

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HV battery worn out most likely run the engine for 10min But no more then 15 min (hood open in park watch RPM 600rpm when charging 500 when done....
That's my best guess, too.
 

j91z28d1

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I just figured that that all the two modes have an occasional jump lurch thing? Mine is just so rare that I have never been able to tie it directly to a certain condition of going into or out of autostop etc. It just feels like someone hit your back bumper and pushed you forward when it happens LOL. Maybe we can start a poll of how many two mode owners have the jump lurch thing and how often. Put me in for "yes have it" and approx every 6 weeks Hahah


mine has only done it a few times, but every time it's after its been parked outside of a restaurant or store for a while in the baking 100deg sun, hop in, ac is maxed out trying to cool it off, both seat cooling on and stop at a read light within a min or two, it goes into auto stop, if light turns green before it starts the engine on its own, it will bump if I take off a hard at all.

when I was looking at the hybrid battery voltages on a scanner, all I could watch while driving was the min and max pack voltage. they showed very close at first when it goes into auto stop but get wider pretty quickly when taking off in electric mod. my guess one or 2 seem to be pretty hurt and drain much quicker than the rest of the packs. so I'm counting the bump up to battery is struggling really badly when it does it.

new pack is on my list of things to do when they come back in stock. but seems it could be a while.
 

BG1988

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mine has only done it a few times, but every time it's after its been parked outside of a restaurant or store for a while in the baking 100deg sun, hop in, ac is maxed out trying to cool it off, both seat cooling on and stop at a read light within a min or two, it goes into auto stop, if light turns green before it starts the engine on its own, it will bump if I take off a hard at all.

when I was looking at the hybrid battery voltages on a scanner, all I could watch while driving was the min and max pack voltage. they showed very close at first when it goes into auto stop but get wider pretty quickly when taking off in electric mod. my guess one or 2 seem to be pretty hurt and drain much quicker than the rest of the packs. so I'm counting the bump up to battery is struggling really badly when it does it.

new pack is on my list of things to do when they come back in stock. but seems it could be a while.
i just manually restart it into M4(DO note it will mess up the bushing on the transmission cable that connects to the trasmssion mine is modified to permanently work with a washer and twist ties NO way i'll spend 400$ to fix it... when i can just go to the dollar store and get zip ties and a washer for under 2$ ) yeah i keep spares in the SUV

apparently there is an app for that you can manually restart the engine using a OBD2 blutooth dongle and MyVoltHold app I have not confirmed the my volt app to work on the tahoe hybrid but someone claimed it did work this *may* cause a check engine light though... but is normal for that to happen when hacking your SUV
 
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tiktok4321

tiktok4321

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Had my #1 coil go out. I replaced it and the lurching seems to be all but gone. But I also replaced the brake sensor switch because my cruise control was super intermittent. Mechanic told me that switch could have fixed the issue as it ties a lot of the various computer systems together.

Incidentally, my mechanic checked the hybrid battery and it had no faults.

I don't know what I did to fix it - or even if it is indeed "fixed", but it's a much more pleasant vehicle now! Even my wife will drive it in "D" again.
 

BG1988

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Had my #1 coil go out. I replaced it and the lurching seems to be all but gone. But I also replaced the brake sensor switch because my cruise control was super intermittent. Mechanic told me that switch could have fixed the issue as it ties a lot of the various computer systems together.

Incidentally, my mechanic checked the hybrid battery and it had no faults.

I don't know what I did to fix it - or even if it is indeed "fixed", but it's a much more pleasant vehicle now! Even my wife will drive it in "D" again.
sounds good i'll replace my coils as well they're 14 years old 109k now... worth a shot right?

got my new o2 sensors today :D i'll put them in soon
 
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tiktok4321

tiktok4321

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sounds good i'll replace my coils as well they're 14 years old 109k now... worth a shot right?

got my new o2 sensors today :D i'll put them in soon
Are you having ANY issues with your cruise control?
 

BG1988

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no issues with that, The Tire pressure sensors need replacement though
 

Dirtrunner702

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Hey there,

The symptoms youre describing are the same that we had when our 2008 hybrid 300V battery pack was shot. The batteries that go first are the ones in the middle of the pack. I confirmed this by calling a local hybrid shop and they had the software to read the voltage and load on the pack. All the wierd quirks went away with a new pack. It was about 2200 bucks back in 2016. The only time we see high revs now is after some time and the pack is warm. Were in Las Vegas so what I did to help air flow to the pack was to cut slits in the plastic under the middle row on the driver side. Yes you hear the blower a little more but it can actually move more air that way. In theory will extend your battery life by keeping it a little cooler.
 
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