This thread is for those that believe working on some of these yotas is a PITA.

this is what I am currently working on:

http://www.europeantransmissions.com...22diagnose.pdf

http://www.shinseiauto.com/japanese/...tzf4hp2204.pdf

http://www.e38.org/electran1.pdf

Can you say ewww.

Related thread on 3 boards (supposedly the top 3 BMW forums out there) (bimmerforums/bimmerworz/bimmerfest) combined 154 views no replies over 3 days. Can you say .


"92 535i Torque Converter not locking up? 1992 535i automatic (obviously)

Recently I have noticed highway mileage has dropped off quite a bit. From about 19pmg to about 15-16mpg.

I am suspecting the TC is not locking up. 60MPH RPM is about 2500 RPM. 70MP is about 3000ish.

Car also seems to buck a little with erratic throttle response with the cruise control on. Suspect maybe a fuel filter, TPS or fuel pump issue, but have not confirmed. Again no codes showing on message display and no CEL.

I have been led to believe researching this that the trans is also "load sensing" as well? Which leads me to a possibility of a vacuum leak. but since I am able to get the trans to down shift using the A/M switch while on the highway, I don't think that is it either.

There is no Transmission warning on the message display when driving but it does come on when the key is turned on/off without engine running, which I believe through my searching is normal?

Anyway I guess what I am asking is if the 2500RPM @ 60mph and ~3000RPM at 70MPH normal and if not does it sound like the TC is not locking up @ 60?"


So to the Yotatech haters that believe they get no help here, I would like to say: $$&*%##^*(&%%


I know alot of us have BMW's on here. I know it's a long shot, but IF you have any experience with the e34 or 4hp22 trans, by all means please chime in here.

 

ok first step, take vehicle to dare I say it, Cottman Transmission for their free TransCheck 21 PLUS® Service and go from there. Too much electrical junk on this transmission it's not even funny.

Appt. 1pm 10/13/10. updates to follow.

 

So? How was the appointment with the transmission shop?

 

heh:

his Snap On scanner he had was not able to hook into the trans but was able to into the motor ecu. It gave him several options (about 10) to chose as far as the transmission goes, of course he didn't know which one to use, so we just took it on a test drive. He said he didn't see anything wrong with it at all. Every shift was a quality shift. (of course I already knew that) And it is shifting into 4th ad dropping it into 3rd on the highway downshift (of course I already knew that).

The trans in this I believe is the ZF 4hp22. Not the GM 4L30E. The "tech" had mentioned the ZF trans does not have a lockup converter in it. So no lockup "5th gear". He said the 4L30E did however. Which I believe is what the 525 e34's got?

Anyway, reading and searching about the "sport and winter" modes on this, I have read that there should be a light on the dash that lights up to tell you your either in winter or sport mode. However, nothing lights up on the dash to indicate the A/M switch is in A or M position nor does it indicate sport mode when in M position and 3 / 2 / 1 shifter position. DO I have this wrong about the light or is something else going on here as well. BTW the switch itself seems to work properly. Just no light on dash. (Maybe just a bad bulb?)

He also said something really stupid to me while there as well. Which will go into the stupidest thing someone has told you about cars thread here shortly. He said in the fall the gas companies change the formula and something about the o2 level in the gas. hmmmm 87 octane is 87 octane, 89 octane is 89 octane. Federally they have to keep it that way. but OK whatever. He said that could be the cause of my gas mileage dropping off and his did like 2-3 MPG. That I can see but 5 or more? I don't think he drop in gas mileage is due to a "reformulation" of the gas in the fall, it's due to cooler denser air which will require a little more fuel to keep the same A/F. ratio. So now I am thinking does this guy even know what the heck he is talking about with the trans.

He did mention there is a shop here that specializes in VW's, audi's etc etc called EUROTECH. I will most likely at some point when I get time take it there and see what they say.

After some digging around I found this site:
http://www.gopnh.com/Transmissions.c...ion=%20ZF4HP22

looks like some manufactures are using lockup converters with this trans but if you scroll down a little and look for the BMW section, well, it says lockup "yes". Which brings me back to does this guy know what the heck he is talking about. And then there is also 3 converters used for a 92 BMW 535i application. Adding to the confusion. I hate going to a shop knowing more than them, because it is usually because I exhausted every possible scenario and cannot with my knowledge figure it out. And these idiots want to make it look like they know what they are doing and well compound the matter and confuse me even more. lol.

Same thing happens to me with computer tech support. Have a problem with my highspeed modem dropping connection and the ISP insists it's my router, well, tried hardwiring into it, wireless into it and hardwired directly into the modem and it drops there too. So what's the common denominator? The MODEM. lol.


So in short, didn't come out of there knowing much more than I already knew except for the possibility of this trans actually not having a lockup converter. I so so want to swap to a 5speed with this thing. lol.

 

On my 635csi (e24) with 4HP22E, three modes, I know different trans, there is a lock up TC. Have you checked fluid level? Also when was the last time the trans filter was changed. These tranny's are great when they work, but a RPA when they do not. Something else, check your tranny ecu connections for corrosion, a major problem on the 6er.

 

that trans is most likely the same one as my 535. I believe those e24's at least after 88 came with the same M30 3.5L I6.

I am pretty sure mine is the 4hp22 but there were several different versions of that trans.

trans fluid is a little high for my liking might drain some out and see what happens. Not sure how it got high, but its not milky at all.

thanks for the reply and some hints.

 

Here in the New Germany, oxygen enriched fuel (alcohol, methanol, no MTBE) is added for winter smog reduction. In my hunk of crap Honda, I loose about 80 miles to a tank until spring when they stop the additive. Can you watch the tack and count shifts? Torque convertor lock up around 40? Convertor lockup will pull RPM down like 300 rpms after it goes into high. Four speed trans and lock up: 4 times?

 

yeah I definately have 4th gear, I can confirm that by downshifting into 3rd with the shifter. but no rpm drop above 60mph which I believe where the lockup is on this. Haven't really checked at 40 though. 40MPH rpm seems kinda low for a lockup but I will check it out.

 

I just went on IDENTIFIX and there is only ONE complaint about torque convertor lockup but this had code 5 and 54 for lockup problem. The person checked the "throttle switch" on the side of the throttle housing. Resistance checks only, no voltage specs. Is this part of the TPS or a separate switch? There was no confirmed fix. Potential causes: TCM,throttle position sensor, open/short in harness. Sorry.

 

TPS came to mind. I know there is some sort of sensor (TCM maybe??) there that monitors for TC pressure, usually that gets tripped and throws those codes when there is low trans pressure from the pump. At least that's the way I understand it. Gonna have to check out that TPS though and make sure it's adjusted properly. Don't have alot of time during the day to look at it as the girlfriend drives it to work and WILL NOT drive the Yota. hahaha.

 

basically, the more north you go, the more ethanol they pump in the gas as an antifreeze. trust me, it's not so dumb what the guy said. As for the rest of what he said ... bah, transmissions are a black bag, especially autos. if you can't find someone who does it all day long on those models, you're going to hear a whole lot of crap.

that being said, i'll see what I can dig up today at work for you.

 

they cannot use by law anything more than 10% ethanol I believe. Maybe they use less in summer months etc etc. this makes more sense. but he said oxygen mixture.

Got some replies in the other forums confirming this thing has a lockup TC. And to maybe do a general tune up on this as well.

You guys think some stuff on ours are expensive check this out and these are AZ specials. lol.:

$99.99


$61.99


$21.99

 

I'd like to be more help xxxtreme, but this is one is out of my comfort zone.

 

hehe. hey congrats making the calendar BTW.

 

i can't even spell BM wubbleyou let alone help ya.

 

haha one of these days I will bring this car down to ya to see it. maybe when I don't need my tools. hahaha.

oh yeah you too on the calendar. good job.

 

and to you congrats.
there was / is a place on the Dallas highway 309 that does high end imports (mercedes, BMW, yugo)....looks like a little shack on the right when you are heading out that way...maybe a mile or 2 from Luzerne.....if I knew the name that might help.

how about Rayco?....gotta be someone there that knows what to do.

 

According to my info the auto may or may not have the lockup - 4hp22/24 does not but the 4hp22/24-eh does if that makes any sense. Likely your's does. That's as good of news as I can give right now because the diagnostics tells me to check for a restricted valve body or faulty solenoid. Still looking but the tune up stuff seems more likely at this point. It would explain the loss of power and the feeling of the converter not locking. Also look at your air sensors like o2 and maf (or map if equipped) they could also explain what you're finding. Those are where I'd start. Back to work I go

 

heh thanks. yeah I knew there was two different 4hp22's. I got to get under this car and see exactly what I got. running my vin does nothing really. the solenoid was mentioned on the other forums, but is likely if that were bad that it would throw that code.

 

if it's jammed and only partially engaging, maybe, maybe not. In 93 the computing on cars with code triggering wasn't so accurate. it could see a return or a signifigant enough voltage drop across a solenoid coil that it would think the solenoid was there but not check the engine rpm, input speed and output speed to verify. that sort of logic came in with OBDII