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Location:
Brisbane
Registered:
June 2005
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 transmission problems with mz20
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Mon, 25 July 2005 08:52
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hey all,
im having problems with the auto box in my soarer. when i purchased the car i noticed the engine oil was too full. i did an oil change to mobil 1 and the correct oil level and ever since my gearbox has been playing up. it doesnt disengage the torque converter when i come to a halt most of the time. has any body experenced simmilar problems or know what might be going on???
cheers
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Location:
East Maitland NSW
Registered:
December 2004
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Re: transmission problems with mz20
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Mon, 25 July 2005 09:20
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how do you mean is doesnt disengage the toque converter. If you are saying your car creeps thats normal. Some cars will do it more that normal because the stall of the converter is never 100% accurate. The average car is set to 800 stall but because of the inaccuracy in the manufacture it may be 50 either way meaning the car will creep on flat ground or it wont.
Is this what you mean?
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Location:
Brisbane
Registered:
May 2002
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Re: transmission problems with mz20
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Mon, 25 July 2005 09:33
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An engine oil change won't have any effect on the operation of the transmission, they are entirely separate components. Something else must have happened if your car's behaviour has changed.
I concur with the above; it's completely normal for an auto car to want to "creep" when stationary. The torque converter never disengages.
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Location:
Brisbane
Registered:
June 2005
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Re: transmission problems with mz20
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Mon, 25 July 2005 12:35
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I completely agree, i cant understand how changing the oil could affect the gearbox, but that is the only thing i have done. The behaviour of the box is not creep, it happens when im driving and i bring the car to a stop, say like at some lights. The car tries to stall itself. I can usually keep it going by double peddaling. It just feels like something isnt disengaging like it should (i can only assume from my limited knowlege of auto boxes that its the torque converter). THe car never had this problem until i did the oil change, and this is the only thing that i did to it. Bloody perculiar isnt it! Another thing, it was really really bad just after i did it. I topped up the engine oil to make sure it was at the right level and it seemed to ease the problem somewhat. It really has me quite bamboozled.
Cheers
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Location:
WA
Registered:
May 2005
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Re: transmission problems with mz20
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Mon, 25 July 2005 14:57
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could it possibly be some faulty electronics/valves, and in fact the lockup is engaging?
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Location:
Brisbane
Registered:
May 2002
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Re: transmission problems with mz20
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Tue, 26 July 2005 00:18
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Sounds more like the idle speed is too low. Check your IACV, it's probably full of gunk and needs a good clean.
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Location:
Brisbane
Registered:
June 2005
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Re: transmission problems with mz20
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Tue, 26 July 2005 00:36
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Thats interesting actually, cause i have notcied the idle is a bit lower than it was before. What is the aicv and where is it located? I asume its in the throttle body or something right?
Cheers for all the help too!!
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Location:
Montrose, VIC
Registered:
May 2002
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Re: transmission problems with mz20
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Tue, 26 July 2005 12:40
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You didn't stick heaps thicker oil in there, did you?
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Location:
Melbourne
Registered:
May 2002
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Re: transmission problems with mz20
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Tue, 26 July 2005 22:43
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id hazzard a guess that the engine is a bit tired and was running thick oil allredy, now you have gone and put Mobil 1 in there its a LOT thinner and its geting past the rings/stem seals ect, so you have probably oiled up a few things, i suggest you run a decent mineral oil (i use valvoline XLD) and just change it more frequently (8000 to 10000km), you may also want to get a few cans of carby cleaner and clean your PCV and idle related parts of the engine as well as maybe new plugs
Allan
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Location:
Brisbane
Registered:
June 2005
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 Re: transmission problems with mz20
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Tue, 26 July 2005 22:48
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Yeah, this all sounds pretty right to me. It was running just some valvoline mineral oil before, so your right it was probably significantly thicker. I changed the plugs when i did it as well, so if i just switch back and give the carbie a good clean then i spose that would be a step in the right direction. there goes $65 of mobil 1  Also, anyone experianced a reddish buildup on the ceramic part of their plugs? I have looked everywhere for a colour chart to get an idea of what it means, but nobody has a clue.
Cheers
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Location:
Melbourne
Registered:
May 2002
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Re: transmission problems with mz20
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Tue, 26 July 2005 22:50
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| MantisBoy wrote on Wed, 27 July 2005 08:48 |
anyone experianced a reddish buildup on the ceramic part of their plugs?
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previous owner was runing it on LRP ?
what engine do you have in it BTW ?
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Location:
Brisbane
Registered:
June 2005
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Re: transmission problems with mz20
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Tue, 26 July 2005 22:56
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Its the 7mgte engine, 3 litre turbo. Last owner and myself ran it only on premium unleaded. The only thing ive heard is that usually a red plug indicates a fuel additive, like octane boost, injector cleaner or some such. However i didnt put any of these things in the car since i put the new plugs in, yet the plugs are still red... curious eh!
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Location:
Melbourne
Registered:
May 2002
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Re: transmission problems with mz20
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Tue, 26 July 2005 22:57
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has anything been done about the head gasket? does it use water?
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Location:
Brisbane
Registered:
June 2005
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Re: transmission problems with mz20
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Tue, 26 July 2005 23:02
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Ok i dont know anything about the head gasket. The guy i bought it off told me it had a full rebuild, however im starting to suspect that he was spinning me a huge one. All things seem to indicate that the head gasket is a bit iffy. I noticed that once i did the oil change the oil was quite cloudy, indicating either some of the coolant is leaking through the head gasket or some similar. The car does not seem to use coolant at all, so im not sure. If it is leaking through its only a small amount. So yeah, im starting to suspect that i may be up for a new headgasket.
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Location:
Melbourne
Registered:
May 2002
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Location:
sunny coast, qld
Registered:
October 2002
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Re: transmission problems with mz20
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Tue, 26 July 2005 23:08
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I had the same problem in my 1g auto soarer. Adjust the kickdown cable on the auto a bit and see if that helps. Fixed my problem.
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Location:
Brisbane
Registered:
June 2005
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Re: transmission problems with mz20
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Tue, 26 July 2005 23:34
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rigthio, sounds like a plan. Wheres the kickdown cable located? And what places can order in new gaskets for the soarer? Ive tried repco they cant get shit. I found a kit on the net with what looked like good stuff..
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Location:
sunny coast, qld
Registered:
October 2002
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Re: transmission problems with mz20
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Tue, 26 July 2005 23:42
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you can adjust the kickdown cable where it is attached to the throttle body. What gaskets are you after?
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Location:
Brisbane
Registered:
May 2002
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Re: transmission problems with mz20
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Tue, 26 July 2005 23:46
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| MantisBoy wrote on Wed, 27 July 2005 08:48 |
I changed the plugs when i did it as well, so if i just switch back and give the carbie a good clean then i spose that would be a step in the right direction.
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Location:
Brisbane
Registered:
June 2005
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Re: transmission problems with mz20
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Tue, 26 July 2005 23:48
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Well, the head gasket i suppose. If i do that i will probably need to do the intake manifold and exhaust manifold gaskets too, as well as a few little misc ones like injector seals and stuff right?
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Location:
Central Coast, NSW
Registered:
February 2005
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 Re: transmission problems with mz20
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Tue, 26 July 2005 23:49
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| Norbie wrote on Wed, 27 July 2005 09:46 |
| MantisBoy wrote on Wed, 27 July 2005 08:48 |
I changed the plugs when i did it as well, so if i just switch back and give the carbie a good clean then i spose that would be a step in the right direction.
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hehheheh
he probably meant to say "give it a good clean with carbie cleaner" not give the carbie a good clean
at least I hope so, anyway..
the idea of a carburetted 7M is just odd! LOL
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Location:
Melbourne
Registered:
May 2002
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Re: transmission problems with mz20
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Tue, 26 July 2005 23:49
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well we can assume he ment carby cleaner on the throttle body 
repco can get you most of the gaskets... just use a genuine toyota head gasket
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Location:
Brisbane
Registered:
June 2005
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Re: transmission problems with mz20
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Tue, 26 July 2005 23:53
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yes well, my bad. I meant clean the "throttle cleaner" with "carbie Body" obviously....
Anyhoo, cheers for the help guys. Ill grab a new gasket i think and give her a bit of maintenance. I assume doing the gasket is gonna be an asshole of a job though, but what the hey, i got a manual
Cheers again!
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Location:
Melbourne
Registered:
May 2002
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Re: transmission problems with mz20
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Wed, 27 July 2005 00:44
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| MantisBoy wrote on Wed, 27 July 2005 09:53 |
yes well, my bad. I meant clean the "throttle cleaner" with "carbie Body" obviously....
Anyhoo, cheers for the help guys. Ill grab a new gasket i think and give her a bit of maintenance. I assume doing the gasket is gonna be an asshole of a job though, but what the hey, i got a manual
Cheers again!
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nah thats easy its the oil drain and feed line that is a bitch! i suggest you replace that with a flexable hose kit from one of the supra performance online stores or get one made.
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