H3 H3 2007 - RPM issue

[rizvikashan]

I have hummer H3 2007 mileage 150,000 KM

so far no issue

Yesterday I was coming from long road trip and noticed RPM is not stable
On 120Km/ph I can hear noise of acceleration but vehicle is not moving as I m pressing gas pedal only RPM is going up also cruise control doesn't work.

I checked with local mechanic he said it seems transmission issue. During ascending it's not moving unless you give more race. Also on reverse it's taking time and more accelerate to move. Mechanic check the transmission gear fluid has smell and there's no error came in computer test.

Any advice would be much appreciated.

Rizvikashan@hotmail.com


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[4speedfunk]

Make sure your brake lights are working properly. Cruise Control issues can be caused by a faulty brake light switch. My 08 did the same thing you describe at only 2400 miles. The dealer replaced the faulty brake light switch, and its been fine since.

 

[ZoroTheGreat]

I'm also experiencing similar issues when climbing a hill at around 60-70 mph. I'm loaded up with about 300 lbs of gear and 2 extra passengers on top of me. Also have a front steel winch bumper with a winch and 35" KO2's. All of this together weighs down the 2007 Base H3 of mine. I have to really put my foot down to get it to shift into 2nd gear at 60 mph just to accelerate at maybe 1 mph every 2-3 seconds. It's pretty slow and I was wondering if a PCM tune would help.


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[rizvikashan]

Make sure your brake lights are working properly. Cruise Control issues can be caused by a faulty brake light switch. My 08 did the same thing you describe at only 2400 miles. The dealer replaced the faulty brake light switch, and its been fine since.

Brake light is working fine
Computer test is okay, there's no error
Tomorrow planing to see other workshops to diagnose. Maybe gear sensor under the oil pan


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[rizvikashan]

I'm also experiencing similar issues when climbing a hill at around 60-70 mph. I'm loaded up with about 300 lbs of gear and 2 extra passengers on top of me. Also have a front steel winch bumper with a winch and 35" KO2's. All of this together weighs down the 2007 Base H3 of mine. I have to really put my foot down to get it to shift into 2nd gear at 60 mph just to accelerate at maybe 1 mph every 2-3 seconds. It's pretty slow and I was wondering if a PCM tune would help.


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Tomorrow planing to see other workshops, seems transmission issue or gear sensor under the oil pan.. computer test is okay without any error.


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[ZoroTheGreat]

Tomorrow planing to see other workshops, seems transmission issue or gear sensor under the oil pan.. computer test is okay without any error.


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What tire size are you running? I think the 35's really take a hit on the i5 when going up hill. Regearing isn't an option because of the front diff housing so the only thing I can think of is a tune. Looking forward to your findings.


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[rizvikashan]

What tire size are you running? I think the 35's really take a hit on the i5 when going up hill. Regearing isn't an option because of the front diff housing so the only thing I can think of is a tune. Looking forward to your findings.


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[rizvikashan]

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[rizvikashan]

maxxis mudder buckshot 285/75r16


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[deserth3]

Sounds kind of normal to me. Those tires look heavy and you were near max load. These aren't speed demons

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[Happy Hummer]

You could always drop the trans pan and change the fluid & filter. Check the trans over.

 

[alrock]

Does sound like it could be a transmission issue. You can check the smell of the transmission fluid yourself - it's obvious if it's burnt.

Yes, the H3 doesn't accelerate well with a load or 35s or a roof rack, etc. but the accelerator still responds even with that load. If there's a delay, that points to a drivetrain issue. It could be as simple as a speed sensor in the transmission (though that's not my first guess) or it could be a failing transmission.

 

[rizvikashan]

Does sound like it could be a transmission issue. You can check the smell of the transmission fluid yourself - it's obvious if it's burnt.

Yes, the H3 doesn't accelerate well with a load or 35s or a roof rack, etc. but the accelerator still responds even with that load. If there's a delay, that points to a drivetrain issue. It could be as simple as a speed sensor in the transmission (though that's not my first guess) or it could be a failing transmission.

Does speed sensor has relation with cruise control? Because cruise control doesn't work, even I tried to go in 140kmph it is not working.


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[rizvikashan]

Does sound like it could be a transmission issue. You can check the smell of the transmission fluid yourself - it's obvious if it's burnt.

Yes, the H3 doesn't accelerate well with a load or 35s or a roof rack, etc. but the accelerator still responds even with that load. If there's a delay, that points to a drivetrain issue. It could be as simple as a speed sensor in the transmission (though that's not my first guess) or it could be a failing transmission.

There's smell is transmission fluid.


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[rizvikashan]

There's smell is transmission fluid.


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4 workshops mechanic confirmed it's a transmission issue, torque converter not working also third gear is slipping, its need to overhauling gear assembly.

Tomorrow I am planing to go transmission specialist best workshops as they all are closed because of Weekend here.

After confirming with those workshops I will go for assembly repairing.

So far every mechanic advised not to buy second hand assembly it's recommended to overhaul my own gear assembly, now I will compare the cost apple to apple and will take decision accordingly, I am very sad [emoji22]


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[alrock]

Agree - either rebuild your own transmission or get a remanufactured one from a reputable source. Don't buy a used transmission.

 

[rizvikashan]

Agree - either rebuild your own transmission or get a remanufactured one from a reputable source. Don't buy a used transmission.

I just spoke to my friend he advised me to change transmission oil filter along with solenoid, may be it can click I am bit confuse to spend money on this step or go straight forward on assembly repairing [emoji848]


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[Happy Hummer]

hmmm.... this is a tuff one. I think i'd go the rebuild route.

 

[Clark]

I had an rpm issue and my speedometer suddenly worked at 20 mpg. I pressed on my gas peddle and I wasn't going
anywhere. also my check engine light came on too. A good friend of mine who is a wizard mechanic advised me to change my transmission speed sensor. And to
my surprise it worked. and to be safe I changed my tranny oil and filter and she's running great.

 

[rizvikashan]

I had an rpm issue and my speedometer suddenly worked at 20 mpg. I pressed on my gas peddle and I wasn't going
anywhere. also my check engine light came on too. A good friend of mine who is a wizard mechanic advised me to change my transmission speed sensor. And to
my surprise it worked. and to be safe I changed my tranny oil and filter and she's running great.

Well in changed transmission oil and filter and it works back to normal mode. [emoji23]

Mechanics are thief here


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[rizvikashan]

I just spoke to my friend he advised me to change transmission oil filter along with solenoid, may be it can click I am bit confuse to spend money on this step or go straight forward on assembly repairing [emoji848]


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It's done just changed transmission
Oil and filter [emoji23]


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[rizvikashan]

Does sound like it could be a transmission issue. You can check the smell of the transmission fluid yourself - it's obvious if it's burnt.

Yes, the H3 doesn't accelerate well with a load or 35s or a roof rack, etc. but the accelerator still responds even with that load. If there's a delay, that points to a drivetrain issue. It could be as simple as a speed sensor in the transmission (though that's not my first guess) or it could be a failing transmission.

Done just changed transmission
Oil and filter [emoji23]


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