My car is drinking a ton of Gas any idea's why ? - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 09-22-2005, 01:34 PM   #11
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Default Re: mpg

Quote:
Originally Posted by SSEBONNE4EVA
You could also unscrew the 02 and look at the tip.
It should be a chalky grey color. If its dark charcoal color its running rich and probably needs changing.
Should we get a GM oxygen sensor or aftermarket? I'm going to check mine at 125000 miles and see if it shows the color it should. Thanks.
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Old 09-22-2005, 02:22 PM   #12
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Old 09-27-2005, 02:45 AM   #13
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I will do a proper MPG check as soon as I kill my current tank of gas (shouldn't take long).
The last tank 1/8 below the full mark, only gave me 240 km or 150 miles.
I think I might know what is causing this............The back brakes are starting to make noise & I think they are sticking. The ABS & traction control have been screwed since I got the car & I've been driving it as is but it just started making this noise.
The computer keeps throwing codes 25, 31, 33, 37, 45 & 61. These codes all relate to speed/abs sensors, inlet valve sensor & the abs pump motor.
I'm going to start with the brakes as soon as the rain lets up here.
I will post back and let you know what happens.

Thanks again for the help,
Dutch
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Old 09-27-2005, 11:15 AM   #14
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Do you know if those are old codes? If they are, do yourself a favor, disconnect the battery while your are working on the brakes (about 1/2 hr) in order to clear the codes. That way you can start with a fresh batch of codes and eliminate any false or old codes still held in memory. There is nothing like chasing a phantom code, but it does give you plenty of drinkin time!
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Old 09-27-2005, 02:58 PM   #15
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As for the sensor Gm parts direct is a good source.
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Old 09-28-2005, 01:50 AM   #16
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I checked the Bonne tonight for any codes and there were none.

While I had the scanner hooked up I checked the O2 sensor and it says that it'* running rich even while idling any ideas as to what could cause this ?
Does this mean that the O2 sensor is done or is it something else causing this ?

I didn't have a chance to pull the O2 for a visual inspection, as it was getting late but I will check it tomorrow night.

Any idea'* ?

Thanks again,
Dutch
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Old 09-28-2005, 11:23 AM   #17
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If its original and you have a lot of miles on the car, and the scanner is saying 02 rich,
you should look at replacing it.
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Old 09-28-2005, 11:54 AM   #18
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Cool...scanned!

The O2 should toggle quickly rich/lean if it'* only rich then..get the garbage bag ready...it'* had it.
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Old 09-28-2005, 09:37 PM   #19
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agreed.....
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Old 09-28-2005, 11:53 PM   #20
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Ok here are the scan results from tonights little misson.
Hopefully you guys can help me interpret these results & tell me if anything looks odd, as I'm new to this scan tool stuff.
The scanner is only picking up one code but I know there are more for sure (I always have a few relating to the ABS).
The scanner is an Actron (cheap scanner around $500).

History code:
58 Vats system

TPS Voltage at WOT (with the Key On, Engine Off) = 4.14 volts

The following is with the engine idling:
BLM (Long Term Fuel Trim) = 131
IAC Position = 47
Exhaust O2 = Rich
Idle Reqested RPM = 750
Integrator (Short Term Fuel Trim) = 128
Knock Retard (Degree) = 0
Loop Status = Closed
MAF (Mass Airflow) (gm/sec) = 1439
MAT (Degrees F) = 93
O2S (mili-volts) = 670
O2S Cross counts = 43
Spark Advance (Degrees) = 20
TCC Slip RPM (Torque Converter) = 256
Throttle (%) = 0
TPS Sensor (Volts) = .41

Do any of these results look wrong ?

Is the O2 sensor the source of my problem with gas consumption ?

Thanks in advance,
Dutch
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