Fuel economy

708 Views 8 Replies 6 Participants Last post by smokin62, Apr 25, 2002

jakej1320

Discussion Starter · Apr 18, 2002

My 87 turbo regal is getting poor gas mileage. It runs pretty good, but I don't have any tuning tools. I'm sure it runs rich, because I smell gas sometimes, but it never knocks. Anyway, the drivers side header has a small crack on the middle tube, and it may be letting in extra O2 from outside, causeing the O2 sensor reading to be off. The injectors are green stripe from who knows where, but the previous owner put them in. Any thoughts on the topic?

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Turbo_Tim

· #2 · Apr 19, 2002

A thought would be a scanmaster from Ramchargers. The unit will allow you to track 0-2 counts, iac, coolant temps, knock, etc.

Spend a little money now, and reap the benefits later. I don't believe the cracked header would draw oxygewn in, because it's pressurised.

How bad is the mileage? Pull a plug wire at the coil pack, and see if the spark will jump 2-3" to ground. Pull a plug. You should be running ac-44's or the equivelent. 43's are too cold for your application (non racing) and will destroy mileage. 44's at .035 is ok.

And welcome to the board!

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firebird_1252

· #3 · Apr 19, 2002

about 2 weeks ago comeing home from e-town i got about 25 on the highway. i'd defintaly check the o2 sensor

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forzfed

· #4 · Apr 19, 2002

Originally posted by Turbo_Tim:

Spend a little money now, and reap the benefits later. I don't believe the cracked header would draw oxygewn in, because it's pressurised.

It will draw oxygen in only when you release the gas and the scavenging effect occurs. You probably don't smell extra fuel under full throttle, I'm assuming. Under boost conditions it ain't going to happen. Definitely get the headers fixed.

And like Turbo_Timmy said, "Welcome a board!"

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Turbo_Tim

· #5 · Apr 19, 2002

forzfed is right. (I was wwwwww, you know

)

Keep it simple, plugs, and wires. I keep an extra 0-2 sensor (AC Delco, purple wire) just to help elliminate it as a source of the problem.

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ncgreg231

· #6 · Apr 19, 2002

what gas mileage are you getting, exactly? I've seen 15.5mpg at the worst, and lately, 20mpg at the best on the highway. You might not be doing all that bad depending on what you are showing...

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firebird_1252

· #7 · Apr 20, 2002

like i said i got about 25+ mpg comeing home from e-town. goin down to MD i got about 25 with the ac on that was combo hwy and city and doin 75+ mph! i love my buick! but right now i'm gettin the best milage.. filled up tuesday and my guage still reeds full.. then again the car hasnt moved but still

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jakej1320

Discussion Starter · #8 · Apr 20, 2002

I'm getting about 12-15 mpg. I figure that the stock engine should do a little better than that. Any opinions on heated O2 sensors? The GSCA offers one at a reasonable price, would it be worth the little extra $?

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smokin62

· #9 · Apr 25, 2002

yeah I get around 12-15 mpg depending how much I get on the boost.

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