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GMC Safari/Chevy Astro Real World MPG

52 messages,  Last post on Mar 05, 2009 at 9:07 PM

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What is this discussion about? GMC Safari, Chevrolet Astro, Van

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#45 of 52 Re: gmc safari [partyd] by guyonearth Aug 05, 2008 (7:27 pm)
Replying to: partyd (Feb 21, 2008 3:24 pm) Where did you get a 5 speed automatic? They only have 4 speeds. (4L60E) Replies to this message: partyd (Mar 05, 2009 9:07 pm)
#46 of 52 Re: 2002 Poor Fuel Economy/Performance [lahainaohana] by guyonearth Aug 05, 2008 (7:32 pm)
Replying to: lahainaohana (Mar 06, 2008 8:57 pm) There are two knock sensors usually, one at the rear of the right head, one at the side of the left head, round objects about 2" in diameter that screw in. It is possible your distributor gear is worn out, throwing your timing off. The glowing exhaust IS NOT NORMAL. You need to find out if this is a result of timing problems or if your converter is plugged. If it is, replace it ASAP. If you don't, you will melt out the core, plug your exhaust, and risk burning exhaust valves out, which will be very expensive.
#47 of 52 Re: P1870 CODE Plus MPG very low [jouls] by guyonearth Aug 05, 2008 (7:38 pm)
Replying to: jouls (Jul 16, 2008 5:05 pm) 1870 codes are often caused by faulty valve bodies and can be fixed fairly easily. Of course most shops will say you need a rebuild, that is how they make their money. The 4L60E transmission used in these vans is very tough and rated for much more power than they have. With maintainance, They should easily last 250K or more. Replies to this message: jouls (Aug 07, 2008 3:45 pm)
#48 of 52 Real worl mpg / 97 Safari 2WD by tstorm Aug 06, 2008 (5:09 pm)
I averaged 15.9 mpg with my last tank, using the air just about the whole time and driving 90% in the city. I've gotten around 20 mpg on the hwy on trips but I drive 75 mph and I know slowing down to 65 would save some gas and get me closer to 23 mpg... the window sticker claimed the van gets 16/23 which is pretty close if you don't drive too fast.
#49 of 52 Re: P1870 CODE Plus MPG very low [guyonearth] by jouls Aug 07, 2008 (3:45 pm)
Replying to: guyonearth (Aug 05, 2008 7:38 pm) So do you really recoment that I get the Transmission down and clean the valve body?   I actually found on you tube a very nice videos on how to give maintenance to that Transmission.   I'm really going to do it.   BR/
#50 of 52 Re: 25 MPG! [guyonearth] by organfreak Aug 12, 2008 (7:22 am)
Replying to: guyonearth (Aug 05, 2008 7:20 pm) I filled the tank and set the trip odometer to zero. I made my trip, several hundred miles, then filled the tank again. Both times I filled the tank, I did not attempt to fill beyond the first auto-shuttoff of the pump. I divided the number of gallons put in into the number of miles I travelled. I triple-checked my math. I didn't believe it either, but there it was. I was hauling, maybe 800 pounds in the back.
#51 of 52 25 mpg? by 68ramair Mar 04, 2009 (7:11 pm)
I have had 3 astro/safari vans for about 10 years. Driven highway behind trucks to reduce wind at 45, 50, 60, 70, and many other speeds for many miles and many years. I have never reached better than 20 mpg.
#52 of 52 Re: gmc safari [guyonearth] by partyd Mar 05, 2009 (9:07 pm)
Replying to: guyonearth (Aug 05, 2008 7:27 pm) My brother rebuild the tranny and install parts from a different gm vehicle this was 4 years ago i don't remember the details but it work , it is the same electronic tranny  my rps are very low on the freeway , i also have new oxygen sensor and the van is been lower 1 inch

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