I have a 1989 190e automatic, and have only recently begun driving it daily to work on the highway. I usually have to 'floor it' from the on ramp to the entering lane just to build up enough speed (30mph - 60mph).
I notice that at 70mph the tachometer reads about 6000rpm. Is that normal?
If not, is there a transmission shifting adjust procedure?
-Isai
In any gear there should be a linear relationship between mph and rpm.. Plot at least 3 points and see if there's a problem.'
NO
the case, minus a few cans!
At a steady 70 mph the engine should be turning between 2,500 and 3,000 rpm. If it really IS turning at 6,000 then it must be screaming as you drive.
Nope... not normal. should be around 2500 to 3000 RPM.
Not normal. You probaby have a vacuum leak, and the transmission is failing to shift into fourth.
No, are you still in third gear?
Might need more than that!
My '86 190e is doing just a hair over 3500 RPM at 70 MPH. I tested this today on my way to the airport...
What happens if you use the shifter to select gears? Does it seem to shift then?
El Sun, 17 Apr 2005 23:39:17 -0700, Martin Joseph escribió:
Since it is an automatic transmission I can only select the 2 or 3 gear. I live in a rather hilly area and on occasion shift into 2 gear to go up hills. Also I occasionally shift into neutral when going down very long but shallow hills. It always shifts fine into 2, 3, or D on a hill. I can even feel the difference between 3 and D on the top of the hill.
But everytime I go on the highway (in D) over 50 mph the tachometer keeps rising. I am not going to try shifting from D to 3 to D on the highway to try and force it. That would be suicide since I drive with a lot of traffic.
Any ideas?
But everytime I go on the highway (in D) over 50 mph the tachometer keeps
Do you actually hear the engine screaming away as the tach climbs? Maybe it's just a faulty tach reading?
Marty
El Mon, 18 Apr 2005 10:34:04 -0700, Martin Joseph escribió:
Yes, I actually hear the engine and it does get louder. I have noticed the economy gauge, at idle, is higher than it used to be (about 2/3). I talked to a local mechanic and he says the economy guage actually reads off the vacuum. Anyways, the car is in his shop for a transmission tune-up. I am waiting for a phone call from him with more specific details.
Any ideas here would be nice so I can compare it against his findings.
-Isaí
If you are saying that you can hear the engine winding up to higher RPM's once you have already reached highway speed, you are almost certainly looking at a new tranny or a rebuild...
I suppose this could also be caused by low tranny oil or poor transmission oil cooling.... but even if it's one of these, your current trans has probably been hammered to a point where it should be R&R'd
Hope I am wrong. Marty
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