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Car Forum / Volvo Cars / August 2006Volvo 1988 740 GLE Low gas mileage.
I have a 1988 Volvo 740 GLE Wagon. It runs very rich. It does something like 18mpg or so in the city and around 23mpg or so on the highway. I changed the O2 sensor, the spark plugs are relatively new, the gas pressure regulator, the fuel filter. I have tried additives to clean injector but all this just went in vein. Does anyone have any clues as what to investigate? What might be the problem? I like the car very much and hope that I can drive more often but I only try to take it in longer trips because of its bad fuel economy. The car has 150Kmiles on it. Any help will be very much appreciated. > I have a 1988 Volvo 740 GLE Wagon. It runs very rich. > > Any help will be very much appreciated. Have you checked the AMM / MAF? zencr...@comcast.net wrote: > > I have a 1988 Volvo 740 GLE Wagon. It runs very rich. > > > > Any help will be very much appreciated. > > Have you checked the AMM / MAF? I have changed the Air Mas Meter since the previous one was busted. What is MAF? (Excuse my ignorance). > zencr...@comcast.net wrote: > > > I have a 1988 Volvo 740 GLE Wagon. It runs very rich. [quoted text clipped - 6 lines] > > What is MAF? (Excuse my ignorance). MAF is Mass Air Flow Sensor. This part of the Air Mass Meter. So, are you suggesting that the sensor inside it is probably not working properly? By the looks of it, it has that thin wire connected when I hold it to light while the older one was not. So, may be I should check it. Do you think it is worth it to get to a dealer to get me detailed diagnostics? How much would they get probably? Does anyone have any estimates? Or, I just get it to someone to do Fuel Injectors induction? I know of a friend's 1989 740s GL doing 27-29mpg on the highway and definitely better than 18mpg in the city. I have a 1990 volvo 740 GLE 16V. The insert that originally came with my car says that it gets 18mpg city and 24mpg highway. For a car that weighs almost four thousand pounds, that does not seem to bad. I usually buy $15 dollars of gas, which makes me feel better because I don't have to give so much of my money, and then drive for 115 miles. > > zencr...@comcast.net wrote: > > > > I have a 1988 Volvo 740 GLE Wagon. It runs very rich. [quoted text clipped - 20 lines] > I know of a friend's 1989 740s GL doing 27-29mpg on the highway and > definitely better than 18mpg in the city. > I have a 1990 volvo 740 GLE 16V. The insert that originally came with > my car says that it gets 18mpg city and 24mpg highway. For a car that > weighs almost four thousand pounds, that does not seem to bad. I That car should about 2900 pounds (~ 1300 kg).  SignatureSakari Ailus http://www.iki.fi/~sailus/ > > I have a 1990 volvo 740 GLE 16V. The insert that originally came with > > my car says that it gets 18mpg city and 24mpg highway. For a car that [quoted text clipped - 5 lines] > Sakari Ailus > http://www.iki.fi/~sailus/ Wrong, owners manual says 3965 lps/1800kg for my 16 valve. > > > I have a 1990 volvo 740 GLE 16V. The insert that originally came with > > > my car says that it gets 18mpg city and 24mpg highway. For a car that > > > weighs almost four thousand pounds, that does not seem to bad. I > > > > That car should about 2900 pounds (~ 1300 kg). > Wrong, owners manual says 3965 lps/1800kg for my 16 valve. I think that figure is maximum allowed weight of the car including passengers, fuel, cargo. Just the car itself weighs around 1300 kg, as far as I know. SignatureSakari Ailus http://www.iki.fi/~sailus/ >>>> I have a 1990 volvo 740 GLE 16V. The insert that originally came with >>>> my car says that it gets 18mpg city and 24mpg highway. For a car that [quoted text clipped - 7 lines] > passengers, fuel, cargo. Just the car itself weighs around 1300 kg, as > far as I know. Sounds about right, most 200 and 700 series are 2900-3300 lbs empty or around 4,000 with a full load. I am investigating a similar matter. My 1987 740 GLE was getting about 27-28 mpg until recently when I fixed the A/C. My next tank of gas lasted only about 200 miles in the city. It might be just a one-time thing, maybe someone swiped a few gallons, but I'll be keeping an eye on it to see if things like A/C really suck out the mileage. > I have a 1988 Volvo 740 GLE Wagon. It runs very rich. It does something > like 18mpg or so in the city and around 23mpg or so on the highway. [quoted text clipped - 11 lines] > > Any help will be very much appreciated. >I am investigating a similar matter. My 1987 740 GLE was getting about >27-28 mpg until recently when I fixed the A/C. My next tank of gas [quoted text clipped - 17 lines] >> >> Any help will be very much appreciated. I have a similar problem with my '95 940 (nonturbo). The BEST I get around town is 18-19 miles per gallon. That is with AC. Not using it is not an option in my part of the US. The few months a year (about 3) I don't use the AC mileage only goes up 1-2 mpg. Thats interesting; I get about 19 city and 22 highway and didn't realize that was low for the 740 GLE. Anything you recommend I check? > I have a 1988 Volvo 740 GLE Wagon. It runs very rich. It does something > like 18mpg or so in the city and around 23mpg or so on the highway. [quoted text clipped - 11 lines] > > Any help will be very much appreciated. hi folks.... Your mileage is at the low end of the range I'd advise my customers to accept but there are many variables. Automatic trans....less mpg, A/C......less mpg, deferred maintenance....less mpg. If you are truly running rich pull the dipstick and smell the oil. Oil contaminated with excess fuel will have an acrid odor. Excess fuel vapor from a rich condition will also throw off the O2 sensor, causing it to adjust too lean leading to incomplete combustion and lower fuel efficiency. Possibly change oil combined with the O2 sensor. Mass air flow problem less likely especially if it runs reasonably well otherwise. EXCEPT, we purchased [once only] several reman MAFs from an otherwise reputable firm which had faulty ambient temperature circuits. They started and ran just fine but had poor mileage. Which leads to.... Coolant temperature sensor issues. Think choke. A CTS can degrade and convince the ECM that engine temp is 20 or 30 degrees less than actual. Just like a partially stuck choke will degrade mileage so too will a CTS out of range. Should you take it to a dealer or specialist ? I'm biased, of course, but generally understanding the electronic systems and strategies are beyond the knowledge of an otherwise skilled home mechanic. I have numerous customers perfectly capable of doing brakes, timing belts, clutches, etc. who [wisely, in my estimation] put electrical/electronic management systems in other hands. pat hayes preferred fleet medford, oregon I've owned my car for about 6 months now, and it's spent most of that time at a mechanics or on jack stands while it was being restored. In the last 2 months I've made 10-15 mile trips, but tonight I made a 90 mile run. I think the mpg is back to around 25 on the highway, with the A/C running wide open. That's the 8v 4-cylinder non-turbo, finely tuned. I don't know what caused the short run mpg's last week, maybe it evaporated in the 110F heat or some kids swiped some gas. > hi folks.... > [quoted text clipped - 28 lines] > preferred fleet > medford, oregon > I have a 1988 Volvo 740 GLE Wagon. It runs very rich. It does something > like 18mpg or so in the city and around 23mpg or so on the highway. [quoted text clipped - 11 lines] > > Any help will be very much appreciated. How do you know the car runs very rich. > > I have a 1988 Volvo 740 GLE Wagon. It runs very rich. It does something > > like 18mpg or so in the city and around 23mpg or so on the highway. [quoted text clipped - 13 lines] > > How do you know the car runs very rich. I have no idea what is the exact term means but this is the expression of an at-home mechanic that I know. > > I have a 1988 Volvo 740 GLE Wagon. It runs very rich. It does something > > like 18mpg or so in the city and around 23mpg or so on the highway. [quoted text clipped - 13 lines] > > How do you know the car runs very rich. I have no idea what the exact term means but this is the expression of an at-home mechanic that I know. I have a 1993 Volvo 940 (non-turbo) with around 136,000 miles, B230F engine. With the air conditioning constantly running, I get 18.6 MPG. Without air, I get 20.5 MPG. On the highways (averaging 75-80 MPH) I'm lucky if I get it up to 21 MPG. It leaks about a quarter-sized drop of oil each night, not sure if this is a problem or not. I am Canadian where we purchase gasoline by the liter (close to a quart) which is an idea that I am not proud of but that's Government for ya! Currently we are paying $1.31 per liter for Premium with an octane rating of only 93. At 4.5460 liters per Imperial Gallon that comes to $5.96 per Imperial Gallon. I have an American Volvo so the odometer reads in Miles. Currently it has 112,000 miles on the clock and is a 94 940 turbo wagon with an automatic non lock-up transmission. Been keeping a track on the mileage lately and the current results over the past 10 weeks are a low of 19.63 MPG city and a high of 29.86 MPG Highway averaging 55 to 60 MPH on the highway.(no air conditioning and I do have roof racks). Please note that figures are based upon an Imperial Gallon, the unit by which we use to purchase gasoline before the Government had a Vasectomy. According to some of the posts here I am doing quite well but I still wish I could do just a little better. I wonder if some of the folks here who are not doing so well with their gas mileage are leaving their ventilation selector set to defrost all the time where the air conditioning is on by default or are driving down the highway with their windows open (excess drag). > I am Canadian where we purchase gasoline by the liter (close to a quart) > which is an idea that I am not proud of but that's Government for ya! > Currently we are paying $1.31 per liter for Premium with an octane rating of > only 93. At 4.5460 liters per Imperial Gallon that comes to $5.96 per > Imperial Gallon. I wish it'd be as cheap here as well. ;) Currently the price of 95 octane (RON, I think) is 1,35 EUR (1,75 USD) per litre. And that's the cheapest octane rating. > Been keeping a track on the mileage lately and the current results over the > past 10 weeks are a low of 19.63 MPG city and a high of 29.86 MPG Highway [quoted text clipped - 3 lines] > Please note that figures are based upon an Imperial Gallon, the unit by > which we use to purchase gasoline before the Government had a Vasectomy. ??? Litre is an SI unit which is cool. Gallon is funny as such already, yet there are more than one definitions. :-) Comparing MPG figures requires conversion from one gallon to the other... Here in Finland (as most of Europe I guess) the mileage is measured as litres per 100 km. > According to some of the posts here I am doing quite well but I still wish I > could do just a little better. I wonder if some of the folks here who are > not doing so well with their gas mileage are leaving their ventilation > selector set to defrost all the time where the air conditioning is on by > default or are driving down the highway with their windows open (excess > drag). I have a 240 sedan with manual transmission and B200F. On summer I get about 7,7 l/100 km (on highway or smaller roads on countryside at 85 to 100 km/h, 50 to 62 mph, a bit in city as well) or 30,7 MPG (US gallons). SignatureSakari Ailus http://www.iki.fi/~sailus/ > I am Canadian where we purchase gasoline by the liter (close to a quart) > which is an idea that I am not proud of but that's Government for ya! [quoted text clipped - 20 lines] > default or are driving down the highway with their windows open (excess > drag). Maybe, but our '88 240 just returned an all-time low of 18mpg in 3/4 city, 1/4 highway driving, with gentle throttle and no A/C. Volvos just aren't especially thrifty. The only thing you can try to improve your already above average mileage is to inflate the tire to about 4psi (or metric equivalent!) below the *maximum* load pressure. That should give you at least 1mpg more if you are running 6-10 psi below it now. |
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