Always full fuel tank!!!!
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Author Topic: Always full fuel tank!!!!  (Read 17371 times)
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loreashlinn
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« on: June 01, 2004, 08:30:27 PM »

Sad Okay, so I have not been able to trade my 2001 Tek with the gremlins inside the electronics!  So, we have now had the BCM replaced and everything seems to work fine except for the fuel gage.  The service code according to our mechanic says that we have excess voltage, but where could that be coming from.  I would hate to have to replace more stuff than needed, so does anybody have a clue on what we should do now?  He's a great mechanic, but this thing has him puzzled!  

I never really hated my Aztek until all of these problems started.  I recommended them to everybody but now................  I just want a car that runs with no service lights or a light show with all of the guage lights! :cry1:

Thanks,
Lore
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JediSkipdogg
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« Reply #1 on: June 01, 2004, 09:17:28 PM »

First off.  Do you know how many volts it's pullin now?  How excessive it is will give me an idea of what the problem could be.  

Also, when he said it's pulling excessive voltage, was the car fully on with engine running?  If this is the case it could be a bad alternator.  Answer those questions and I can help ya out some more.
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Newfie Hauler
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« Reply #2 on: June 01, 2004, 09:22:29 PM »

The mechanic didn't by chance say that the fuel gage circuit had high resistance?  Did he give you the Diagnostic Trouble Code (DTC) by chance, if one was found?  I understand your fear on this one, because it could be a number of things, wiring problem, fuel level sending unit, instrument panel cluster or the Powertrain Control Module.  It appears that the electrical resistance readings for that circuit are very important (40-250 ohms).  They equate what the gage should be reading, based on how much fuel is in the tank.  If the readings are above that, I would suspect the IP cluster.  Also he needs to test the fuel level sender signal circuit for high resistance as well as the low reference circuit of the fuel sender for high resistance as well.  It appears that it should range anywhere from 40 ohms of resistance empty to a maximum of 250 ohms full.  It is possible that the sender float arm is just stuck and needs to be freed up.  That may cause a high resistance reading.  If all of those resistances are in the normal range, I would then begin to suspect the PCM.  Keep in mind that the wiring and connectors for all of these circuits could be part of the problem as well.  

I am even wondering if this may have been the root of the BCM failure your Tek had.  This circuit ties into the BCM from the instrument panel cluster through the PCM to the BCM.  A problem (short circuit) in any one of those circuits could have taken out the BCM.  I also checked out the BCM programming procedures to see if by chance he might have left something out in the programming.  It appears that he did not.

I hope that this helps.
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trouble
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« Reply #3 on: June 01, 2004, 09:27:53 PM »

There was also an article in the paper this week that gasoline that had excessive sulphur amounts in it would freak out the gas gauge. Several people were having problems with it in FL and LA.  
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Newfie Hauler
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« Reply #4 on: June 01, 2004, 09:35:45 PM »

Quote
There was also an article in the paper this week that gasoline that had excessive sulphur amounts in it would freak out the gas gauge. Several people were having problems with it in FL and LA.
Some of those fuels with a high sulfer content are not too good for the O2 sensors either.

I was just thinking about this one a little more.  I believe that there might even be a service bulletin on this issue.  Either that or I saw it in a GM Techlink article.  I will see if I can find it.
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loreashlinn
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« Reply #5 on: June 01, 2004, 10:18:18 PM »

:wave: Thanks for all of the quick responses!  I will take him a copy of all of them tomorrow morning and see if they might give him some ideas!

I will try and not give up on my Tek, they are really great kid haulers!

 Cheesy
Lore
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ANDE2004
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« Reply #6 on: June 02, 2004, 12:40:40 AM »

Loreashlinn

I would get to the bottom of this problem for one simple reason, and that is that it relates to the fuel level quantity indication and all of the electrical components that make up the system.
overloaded electrical components usually build up excessive heat, and everyone knows hot parts and fuel do not get along well.

I just HOPE its not the sending unit.

Good luck on your endeavors,,we are all pulling for ya!

ANDE
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kentekkie
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« Reply #7 on: June 02, 2004, 04:34:10 AM »

Anyone think it could be the battery itself?  I know mine had to be replaced along with the bcm.  Dealership just said they ran tests on the battery and it came up with errors and that either the battery killed the bcm or bcm killed the battery.
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chameleon-Kat
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« Reply #8 on: June 02, 2004, 04:48:44 AM »

Hhmm If I remember correctly the excess sulpher content was in Shell gasoline sold in gulf states and was bad enough on fuel gauges that they stopped selling it.  Ray
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Newfie Hauler
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« Reply #9 on: June 02, 2004, 06:14:21 AM »

Jedi,

I saw your posting and it has me thinking about the alternator as well.  I checked that information out and I guess we need more information from the mechanic.  Where is he reading the excess voltage?  What DTC, if any, were set?  I stumbled upon another possibility as well, the fuel level sensor (part of the EVAP circuit).  Typical voltage for that is0.8 volts at empty and 2.5 volts at full.  Any additional info that he can provide will help to narrow things down a bit.
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Zinnium
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« Reply #10 on: June 02, 2004, 07:26:59 AM »

if you did fill up at a shell station i would assume that is whats causing it.   We have a pressurized system and that bad gas would really mess up our system
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GH
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« Reply #11 on: June 10, 2004, 06:31:28 PM »

Speaking of always full fuel tank... or sometimes empty or half way...
The gas sold in the Tampa/St Pete Fl area with high sulfur content was more than just Shell. It was Chevron and Texaco also who admitted to this problem.
Whats worse is that I did not fill up at these stations and I now have this problem with the gas tank guage going crazy. And I know of people including myself who now have this problem who fill up at Hess. But Hess admits nothing.
Interesting that there are only 3 places in this area to fill a tanker truck and so many more gas stations. On top of the high sulfur gas... Gas delivered to Miami, parts of Jacksonville and the Tampa/Stpete area all contain an additive which is supposed to cut down on the emissions. If the gas didnt have so much sulfur maybe they would not have to use this additive.

So on top of my odometer not working now the guage is crazy. Had to push it down from an 8 story parking garage cause the tow truck couldnt go up. It finally started with the one gallon of gas he brought after we got it down on level ground.
After all this I still have not taken it in yet. Trying to figure out how Im going to get to work or if I should just take a day off.
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Newfie Hauler
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« Reply #12 on: June 10, 2004, 09:20:33 PM »

hrin,

Please keep me posted.  I am curious to know what they find.  Regarding transportation, does your dealer have a courtesy shuttle to take you to work and back when your Tek is ready?  Our dealers  here in Detroit have them, didn't know if yours does.

I think on your Tek, I am leaning more towards a problem with the cluster or the wiring to it.  It will be interesting to see what they find.

Usually the sulfur in the fuel messes with the injectors, spark plugs, O2 sensors or the EGR (if equipped).  I have never heard of it messing with the fuel gage or the gage's sending unit.  I suppose it is possible.

Newfie
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tomyo10
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« Reply #13 on: June 11, 2004, 10:21:52 AM »

I also had to get my gas gauge/sensor replaced because of the "always full" reading. In NW PA, we had a gas supplier with excess sulpher content, but that was not the cause of the gauge problem.
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loreashlinn
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« Reply #14 on: June 18, 2004, 11:03:39 PM »

:lol:  :cry1:

Well, the good news is that after an extended visit to the mechanic, I now have my Aztek back!  The bad news is that I had to have a new BCM, EGR value and the fuel guage/sensor all replaced.  

Bad news for me is now that I have sunk so much money in getting this ...... junk fixed, I can't afford to trade it in, yet!

Lesson learned..........never, ever buy a first year of production car!

Thanks for everyone that gave suggestions on trying to fix it!  I really did like it before all of this gremlins decided to invade.

Lore
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