View Full Version : Surging
Timbo
24-03-2005, 07:31 AM
Hey, i own a 1990 TP SE magna auto , and when the engine warms up if i have the overdrive on the car begins to surge. When i turn the over drive off it stops doing it. I have spoke to my mechanics and they say it probably has something to do with the automatic transmission. I have also heard that putting genuine mitsubishi automatic transmission fluid in the car can stop the problem? Has anyone come across this problem, and if yes what would you recommend? Thanks
Aströn Boy
24-03-2005, 07:34 AM
http://www.aussiemagna.com/forums/showthread.php?t=16417
Automatic fluid thread.^^^
tho, unless ure using 4th gear, why have it on? but yeah, would be annoying to have either way.
Timbo
24-03-2005, 07:40 AM
I have the overdrive on because i travel 80kms a day to work on highway roads, and with it on it is supposed to give better fuel efficiency, etc. If u have any ideas for solutions to the problem it would be much appreciated
Aströn Boy
24-03-2005, 08:24 AM
well i barely now use my overdrive, revs are to low
but when i did id never actually put it on until just past 80kph, if you leave it off and 4th gear doesnt get used, which it seldom does unless exceeding 80 itself, then your making the car do more work, using more petrol and really just giving yourself a sluggish ride.
you can use it, im not saying you shouldnt, but only click it to on, when your about at 80ks with 3200rpm and the car wont seem to go anyfurther without some real throttle.
as for fixing your surging problem, it probably is just fluid, BXC7 (if thats his nick :redface: ) he reported a surging problem, replaced his fluid, and basically felt like new. so yeah,
as for fixing your surging problem, it probably is just fluid, BXC7 (if thats his nick :redface: ) he reported a surging problem, replaced his fluid, and basically felt like new. so yeah,
the surging problem is caused by the lock-up clutch (which just helps a little with fuel economy in overdrive). recently i've been having the same problem that you are describing and there's two ways to fix it - ideally solution #1 is better, but for a temporary fix - solution #2...
1) get the trans serviced - and use the mistu fluid (the mistu fluid has an additive that helps the clutch correctly operate)
2) disconnect your temp sensor so the TCU never locks the torque convertor in the first place. I did this for a while, then I got my trans serviced. the TCU doesn't engage the clutch when the motor is cold (or when it's sucked into thinking it's cold :badgrin:). there's two wires on the sensor (from memory - yellow/green and yellow/red - the one you wanna disconnect is the yellow/red)
if your gonna disconnect the wire, to make sure you disconnected the right one, check your temp guage - it should read the temperature still (also meaning that your radiator fans should work too! but make sure they work after disconnecting it to be sure by letting the car idle until it reaches operating temp... if they dont, connect the wire again)
the only consequnces of this is the lock up clutch doesn't operate (meaning no more surging) and maybe a little bit more fuel consumption... although i didn't notice much difference.
hope this helps,
Bill
Timbo
25-03-2005, 03:19 PM
Hey Bill, thanks for your reply. I will get my trans serviced and see if it makes a difference! thanks :)
AussieFella
26-03-2005, 05:37 AM
I had the same thing happen in my old auto, and i disconnected the torque converter lock up wire and it helped it for about 2 months, then it began to do it again on and off, could of been the fact that the transmission needed a service tho. Let us know how you go. :)
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