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HI my sx4 idles at 1500 rpms and when you put it in gear to back up it backs up at 20 miles a hour with out feeding gas . MY car has 48,000 on it and the trans fluid is burnt and very black. ANY HELP !!! Thanks MR RIFE
 

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Well your idle RPM is too high, thus the movement in gear at that speed.

The trans? Over worked from towing, style of driving or pending doom from internal parts failure, as that black condition isn't normal for that mileage. A trip to the Trans Specialist shop is my suggestion. A fluid change ASAP, at a minimum.

On the idle speed...a cleaning of the Idle Air Valve would be a good place to start. ;) That and inspecting the throttle linkage for issues.
 

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... MY car has 48,000 ..
Since no mention of where you live, is that km or miles?.ANd at what outside temperature ? Manual or auto?
..Max reply is totally factual and of course...it would even be worse if we speak km...
Idle on mine when warmed up is near 700..however when just started and cold, it is above 1000 or 1200..though not 1500 as I recall...
Is 2008 an electronic throttle or mechanical linkage ?....
..EDIT: Yeah..electronic..based on 2000cc gas engine manual...
check this out
www.avigex.ca/sx4/throttle.pdf
 

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Well in fact I checked that out to-day and initial rpm is over 1500, near 1700,,,outside temp -4°C, around 25°F. That is in neutral.
ONce in gear (Auto) rpm goes down to 1200...then below 1000 within less than 1 minute. Car had not been in use for 3-4 days.
 

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You are describing a cold start / fast idle scenario, of a typically normal operation!

Is this experience NEW to you? :huh:
 

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On this and the ClubSX4 forum, scorching of the AT fluid has been an on-going topic. Once it has been overheated and it's scorched, you can do nothing but have it changed, by a shop with the machine that can do a total flush and re-fill.

At about 20k miles, my AT fluid had not shown any signs of scorching, so I got Pro-Active and put in about 3/4 of a bottle of Prolong Transmission additive.
With the 1/4 bottle left, I put that in the Power Steering reservoir, to prevent scorching of the Power Steering fluid, , , another problem area.
Both the AT and the power steering use the same Dextron III transmission fluid.

Then at just over 40k miles, when I traded off my SX4, both fluids were still nice and pink, as good as new. NO signs of scorching at all.
And, I worked the crap out of that little car!

Well, that's how I dealt with the problem. Prevention is so much easier and cheaper than repairs.

Cheers Mates!
:cool:
 

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You are describing a cold start / fast idle scenario, of a typically normal operation! Is this experience NEW to you? :huh:
Yes..cold start..and I guess the thread starter is describing this situation too. ANd I know it is normal...specially in cold weather..it takes a bit longer to settle down. I just paid special attention to it today because of the initial question. IT causes no problem at all .
 

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I'm surprised it's even mentioned in this day and age.

Unless, the OP has never driven a car before. Because cars have had idle advance and Automatic Choke for about as long as I can remember and that's at least a half century. Before that we had manual Choke, which also raised the idle speed, for a cold start. Anyone remember that?.....cars with a manual choke???

As for backing up by itself, . , . the reverse gear is the lowest gear in the box, so it doesn't take much power from the engine to get the car moving in reverse.

Spring is HERE! Whoopee! It's about time.

:cool:
 
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