electrical problem transmission flaring?

[MrIgor]

If someone can start their hummer, and disconnect the negative cable from battery tell me if the gauges on dash, stereo work etc.. ( the truck will not shut off). Trying to test out my alternator.


Also If I disconnect my MAF I see no difference in idle or acceleration.

[jsbihn]

Ok, not sure why you are checking the ALT in regards to your transmission issue.... but then again who would think that a MAF would cause issues either....

With that said, if you unplug the MAF the ECU will get signals from temps, rpm, barometric pressure, and tps sensor readings to make a calculation of what amount of fuel should be injected. As long as the engine isnt all out modified and running iwith a new program, it shoud actually run pretty well without the MAF. Of course, if weather conditions, pressure, elevation, etc. change, the MAF will make the ECU adjust alot better then trying to caluclate which will make the engine run better.

Given, I am wondering if you drive the vehicle with the MAF unplugged do you still get the in between shift surges? I would think that if you didnt, it would be definitely the MAF and though it is cleaned could be signs it is bad.

[MrIgor]

Originally Posted by jsbihn

Ok, not sure why you are checking the ALT in regards to your transmission issue.... but then again who would think that a MAF would cause issues either....

With that said, if you unplug the MAF the ECU will get signals from temps, rpm, barometric pressure, and tps sensor readings to make a calculation of what amount of fuel should be injected. As long as the engine isnt all out modified and running iwith a new program, it shoud actually run pretty well without the MAF. Of course, if weather conditions, pressure, elevation, etc. change, the MAF will make the ECU adjust alot better then trying to caluclate which will make the engine run better.

Given, I am wondering if you drive the vehicle with the MAF unplugged do you still get the in between shift surges? I would think that if you didnt, it would be definitely the MAF and though it is cleaned could be signs it is bad.

if i unplug maf, i dont get any check engine light or error codes (i scanned the truck)




If I start truck and disconnect positive or ground from the battery in about 30 seconds my speedometer and stereo start turning off and on... but wont die.

[New York City]

I swear I am having the same identical problem.
And I do mean identical.

Everything you have stated.


How much did it cost you to get programmed at the dealer?

[jsbihn]

Igor,
I am wondering if when you had your tranny replaced did you have the oil pump for the tranny replaced.
As I mentioned in NYC's post it could be the pump... could have been the whole time.
Also, I would think that if you have disconnected your battery and the truck runs and cycles thats good. Maybe your Alt isnt as strong as it should be and it pulls a little from the battery (which I have heard that this is really the case in the H2), so if so I would think that the electricals would start to cycle on and off without the battery because the Alt isnt making the juice it needs to.

(again this is a common thing from what i heard. the alt is under-powered and it will suck from the battery, so of course another reason why alot of people with extra lights, extra electronics or stereo systems go through lots of batteries.)

hope this helps

[MrIgor]

The problem has been narrowed down to the MAF sensor. If you unplug it the transmission shifts good. If you plug in the MAF it slips

[jsbihn]

Glad I could help narrow it down to fix.