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#18863 of 19336 Can I tow a Manual or auto Forester?
Oct 30, 2010 (5:47 pm)
OK everyone, thanks for your input. Although I did not get a definitive answer from a certified Subarua tech person I think there is enough evidence here for me to make a decision.
1) A Forester with manual transmission can be towed all wheels down, it can't be towed with the front Two wheels on a dolly.
2) No way shape or form can an Automatic transmission Subaru be towed for long distances (Unless ther drive shaft is physically un-coupled).
So I got a 2007 Manual shift Forester with 29,500 miles on it - guess what? on my first trip out today I find it has a transmission noise when I gently touch the gas at above 55 mph. Kind of a growling, or high speed knocking noise. The noise is not there if I go into neutral and touch the gas pedal, only when I am in gear (3rd, 4th, or 5th).
Anyone got any thoughts on this ? Yes I am going to take it back to the dealership where I bought it.
#18864 of 19336 Re: Can I tow a Manual or auto Forester? [foamy59]
Oct 30, 2010 (6:26 pm)
Car Talk had a person report, that he was towing an AWD vehicle. After 50 miles going up hill in the heat, the car caught fire. It started in the transmission area.
#18865 of 19336 Re: Can I tow a Manual or auto Forester? [foamy59]
Oct 31, 2010 (10:28 am)
What rpm and throttle input is causing this noise? Is it turbocharged (xt) or not?
#18866 of 19336 Re: Can I tow a Manual or auto Forester? [colin_l]
Oct 31, 2010 (6:39 pm)
RPM's can be anywhere from 2500 - 3500, throttle is just barely open.
I am sure it's not engine related because when I go to neutral at say 65 mph the noise goes away and if I put on a touch throttle the noise does not appear, if in gear 3,4, or 5 under exact same conditions the growling/rattling noise appears. Loudest when driving at 65 - 75 mph with very little throttle.
Frequency seems to be about same as wheel/drive shaft speed. I feel that is is a worn gear somewhere because when no power is transfering from the engine (Coasting) noise is not there, but when just powering on noise is worst (Back-lash between some gears??), and when hard powering noise is there but not so bad (Power overcoming gear back-lash ???)
#18867 of 19336 Re: Can I tow a Manual or auto Forester? [foamy59]
Nov 02, 2010 (6:04 am)
I wouldn't be so sure based on your test. Revving in neutral has close to zero load, and it is markedly different than accelerating or maintaining steady speed in top gear.
Gear whine is present at all speeds.
I'm not saying it is impossible that you have a transmission or other driveline issue, but I think it's also possible that you are hearing detonation. Detonation will not occur when revving in neutral but I will say that if it's occuring with light throttle in a higher gear it should also occur with heavy throttle in *any* gear.
Any noise when you give it 100% throttle?
#18868 of 19336 Re: Can I tow a Manual or auto Forester? [colin_l]
Nov 02, 2010 (7:25 am)
Thanks for your comments Colin:
I took it to the Subaru tech shop, he heard a few things and tightened up a couple of clamps and hose supports etc. and then we road tested it. On the road test I had problems making the noise again, so we assumed that there was some resonance noise that was fixed by tightening up clamps etc. The tech said if there were something like a bearing or gear damage he would definitely hear ti, it's not something you can miss. So we left assuming all was well - Not.
On the way home (15minutes) the noise cam back again, so it seems like something has to warm up before the problem can be heard. Will warm it up again and have the tech ride with me.
Your points - Detonation, most unlikely, I know this noise and it's nothing like that.
Gear wine - no, it is a definite growling with knocking noise.
#18869 of 19336 Re: Can I tow a Manual or auto Forester? [foamy59]
Nov 02, 2010 (8:07 am)
Interesting. Another item that it could be, since you mentioned it only happens when warm, is the cam/timing belt tensioner.
The tensioner has a hydraulic piston and when it starts to fail it often does make noise primarily when warm and under load. A few people, however, have noticed noise only at cold-start. My opinion is that it depends on if the tensioner is locked in place or if it loses tension and compresses.
#18870 of 19336 08 Legacy 30,000 tune up and mpg loss?
Nov 09, 2010 (3:39 am)
I make the same 600mile round trip all highway since the car was new. It consistantly got 32-33mpg even with snow tires in winter until this last trip.Variables all the same except in Oct. I had the 30,000miles tune up (spark plugs etc.) I got 29mpg, this time which concerns me. Any ideas?
#18871 of 19336 Re: 08 Legacy 30,000 tune up and mpg loss? [rebel71]
Nov 09, 2010 (5:59 am)
With electronic ignitions, the computer module is constantly checking the sensors and adjusting the timing for optimal performance. As the spark plugs wear, the computer adjusted the timing to maintain a constant mpg. When the plugs were changed the computer need time to reset. How long that is will, I do not know. Someone else in the forum will have to chime in.
#18872 of 19336 Re: 08 Legacy 30,000 tune up and mpg loss? [rebel71]
Nov 09, 2010 (7:18 am)
Phil is definitely on the right track, and this kind of variance could be normal depending on weather conditions, speed, driver aggressiveness, and so on. If there is a physical cause, though, my two guesses are fuel quality-- which you have very limited ability to influence-- and spark plug type & gap.
If they install the wrong plugs or have them set to the wrong gap they could affect economy. You probably would have a rougher idle, too.
My personal guess: normal variance.
But you can dig into some of these things if you want. I would start with a fuel system cleaner to rule out bad fuel. Chevron Techron is the best by far. (Everyone will copy it when the patent expires.)