Forum Moderators: open

Message Too Old, No Replies

My *new* car.

need some information

         

tonynoriega

3:16 pm on Jan 21, 2009 (gmt 0)

WebmasterWorld Senior Member 10+ Year Member



ok, so i bought a 2009 ford focus a few months back. 4 dr sedan, auto trans, basic model...

only 1985 miles on it.

last week started noticing my transmission was acting funny, and of course with my warranty, took it in to find that the Transmission Range Sensor failed. 5 days later i finally got my car back with a new one installed....

but you know how you can feel even the slightest change in your vehicles performance, or that little knock you know wasnt there the other day... you can just tell when your car isnt acting right (if you pay attention to those things.. most guys do, but thats not a knock to you ladies.)

anyway, i think that my rpm's are just too high during normal driving. im at 20k rpm at 40mph in normal acceleration. It just seems too high. My idle rpm is at 7500 and i dont recall it being that hight before my sensor failed.

now, i also read on some forum in a far away land, that another customer had the same issue, and his MPG decreased by 10-15%...

is there a way to find the detailed specs on this card to find the normal range of rpms to mph and idle speed rpms?

what im thinking is that with the sensor that failed, something else may have been screwed in the process, and they cant detect it, and my transmission is going to drive in high gear all the time, thus killing my MPG which is the reason i bought this damn car in the first place...

anyone got anything i can run with?

jdMorgan

3:27 pm on Jan 21, 2009 (gmt 0)

WebmasterWorld Senior Member 10+ Year Member



7500 RPM at "idle" is ten times too high, and if the service technicians don't acknowledge this, then you need to go elsewhere...

Or ask them to show you any other Focus on their sales lot that idles that high.

7500 RPM is so far out of range, that I almost suspect an additional problem -- a bad RPM sensor or engine-control module.

Look into "lemon laws" in your area as well, in case you can't get it fixed and need to return the car for a refund (or threaten to do so).

Jim

simonuk

3:35 pm on Jan 21, 2009 (gmt 0)

10+ Year Member



My idle is 600 RPM so yours is waaaaaay too high :-)

BeeDeeDubbleU

4:31 pm on Jan 21, 2009 (gmt 0)

WebmasterWorld Senior Member 10+ Year Member Top Contributors Of The Month



I think Tony probably meant 750rpm. I have a Ford Focus here in the UK. Is it more or less the same car?

tonynoriega

5:09 pm on Jan 21, 2009 (gmt 0)

WebmasterWorld Senior Member 10+ Year Member



crapy...yes i meant 750...just under the 1 in the tachometer.

but that still seems high.

and at 40 MPH i meant to say 2k... i must have added an extra 10k everywhere...sorry...

are my numbers still too high? i feel they are... any my gas guage is showing it... that needle is moving way faster than it did.

lawman

5:20 pm on Jan 21, 2009 (gmt 0)

WebmasterWorld Senior Member 10+ Year Member Top Contributors Of The Month



Whew. A focus revving to 20k rpms? Would've been a freak of engineering. :)

weeks

5:41 pm on Jan 21, 2009 (gmt 0)

WebmasterWorld Senior Member 10+ Year Member Top Contributors Of The Month



(if you pay attention to those things.. most guys do, but thats not a knock to you ladies.)

My experience is it's just the opposite--the ladies notice every little thing on everything. I've learned to listen.

tonynoriega

5:58 pm on Jan 21, 2009 (gmt 0)

WebmasterWorld Senior Member 10+ Year Member



well as you can see I wasnt paying attention to my post...

does anyone know what the transmission range sensor is tied to?

wheel

10:32 pm on Jan 21, 2009 (gmt 0)

WebmasterWorld Senior Member 10+ Year Member



Tony, I'm no mechanic, but the transmission range sensor has to be tied to the throttle somehow - something's got to tell the tranny when to drop down a gear if you put the hammer down. Doesn't it?

But with cars these days, it could be something as dumb as an oxygen sensor. Who knows. I suspect you'll have to diagnose this by calling the mechanic folks again.

bunltd

11:33 pm on Jan 21, 2009 (gmt 0)

10+ Year Member



We drive Thunderbirds & have a Festiva and have found forums to be invaluable for that type of question. (not to mention, you meet some really nice people)

There are fora out there for most models with great info and helpful enthusiasts. Since I can't link there, Google "ford focus forum" I'll bet they've got an answer.

zeus

11:40 pm on Jan 21, 2009 (gmt 0)

WebmasterWorld Senior Member 10+ Year Member



I can say this my bike does maxs 12.500 and thats pretty good at 200mph, a normal car max is about 5000.

swa66

7:35 am on Jan 22, 2009 (gmt 0)

WebmasterWorld Senior Member 10+ Year Member



Although you have it figured out, 20K RPM is way beyond normal working range for a mass produced piston engine. It's about the breaking limit for a F1 racing engine, redline being lower (when they were built to last _one_ race).

As to automatic gearboxes shifting sooner or later it depends a bit on "style" of the driver and settings. But the logic in most common gearboxes is very primitive: basically output RPM is measured and engine vacuum (together with a kick-down from the throttle and position of the lever). That input is "calculated" into shift points using what is basically a "mechanical computer" in the form of valves, gaskets and a hydraulic maze.

There of course have been some improvements to make it slightly smarter and to allow to have more gears than a handful, but the basic system is still the same.

Far smarter "automatic" gearboxes exist (e.g. Volkswagen's DSG gearbox: these are actually *dual* regular manual gearboxes used in a sequential manner under computer control) but they're not typically used in mass market products by the ailing US automakers.

tonynoriega

3:09 pm on Jan 22, 2009 (gmt 0)

WebmasterWorld Senior Member 10+ Year Member



i think im going to keep an eye on it this last quarter tank of gas.

then, reset my milage tracker counter with a full tank of gas. drive normally to and from work and do some calculations...

13 Gal / Miles counted... hopefully will give me a good estimate.

they rate at 35 hwy and 28ish city...if i even come close to that ill be satisfied...

if i see something like 15-20... i might lose my cool over at their service shop...

1900 miles and this happens? not on my watch.