My car is drinking a ton of Gas any idea's why ? - Page 3 - 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 09-29-2005, 12:17 AM   #21
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I'm not saying your O2 isn't bad, it could be. But something else could actually causing it to run rich. Leaky injectors, fuel pressure regulator leaking fuel into the vacuum lines that gets sucked into the intake, or not relieving pressure like it should at low throttle.

Ignore the code 58. It'* a known bug with 92.
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Old 09-29-2005, 07:09 PM   #22
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Thanks for the input, I will check what you mentioned.

Thanks,
Dutch
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Old 10-01-2005, 03:07 AM   #23
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Just for clairification sake the scan tool is showing the O2 as reading "Rich" at idle & all the way through acceleration (not just at idle).

I don't see any injectors leaking but I will check that and the fuel pressure regulator. What is the best way to check the Fuel Pressure Regulator ?
After I changed the Gas tank, Pump, sending unit & filter I checked the fuel pressure at the fuel injector rail and it seemed normal (40 something psi)

Thanks for the input,
Dutch
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Old 10-08-2005, 03:19 AM   #24
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After testing a bunch of the sensors I ended up changing the O2 and MAP sensors last night.
The Idle seems to be more stable now (before it was low and iratic, around 750 -1100).
The gas consumtion seems to be a little better but still higher than normal.
Today I went through aprox. 10 litres for 85 kms.

Any ideas what else could be causing this ?
Did anyone take a look at the scan tool results that I posted on the previous page ? Anything look abnormal ?

Thanks again,
Dutch
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Old 10-08-2005, 09:18 AM   #25
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Dutch, If you could, fill your fuel tank to full. Reset the tripmeter to zero, or write down your odometer reading. Then drive the car to use that full tank of gas, refill the tank to full. Take note of how many liters it required to fill tank, divide kilometers by liters, this is your km/liter, or mpg. Actually, multiple fill ups is a little more accurate, however this will serve as a quick indicator of fuel consumption.
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Old 10-08-2005, 01:31 PM   #26
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I've been trying to hold off on filling up because the price of gas in Toronto has been insane lately (91 Octane $1.20 - $1.40 / L). On top of that I've been going to the gas station almost nightly, due to the amount the Bonne is eating.
I will fill up tonight and write down the km'*.

Thanks,
Dutch
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Old 10-14-2005, 01:27 AM   #27
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Ok the mileage test is in...........sorry it took so long (waited for the price of gas to come down to a resonable price)

I did the recommended method of tank up, drive until a half tank remained, then refill.

For 233 km = 31.5 litres OR 145.6 miles = 7 gallons

This works out to be:

7.4 km / Litre OR 20.8 miles / gallon


This is better than what I was getting before, but its still not right.
Prior to this I changed the O2 & the MAP sensors as they were faulty.

Anyone know what the MAF is supposed to show as far as grams/sec of airflow ?
My MAF is showing 1400-1600 gms/sec on the scan tool at idle............I think thats really off and may be the remaining cause of my problem, but I'm not 100% sure.

Anyone have any ideas ?

Thanks again,
Dutch
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Old 10-14-2005, 03:27 AM   #28
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20.8? Mixed City/Highway, that might not be far off.

For City only, that'* excellent.
For Highway only, that sucks.
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Old 10-14-2005, 12:15 PM   #29
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Yes, do tell us if thats all city, combined, or highway?
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Old 10-14-2005, 08:47 PM   #30
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Around 1/3 is highway it should be 1/2 but morning rush hour on the highways are grid-locked, so its a slow crawl. The rest is city driving.

Dutch
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