overdrive

svxAL · #1 03-28-2008, 11:53 PM

I got my car to the tranny shop today and they say that the overdrive is kicking in and out. they say it can be driven like that and sespect it to be my mafs. so I took it off and cleaned it with carb spray.(throttle body clean as well) and put a new cone filter on so everything would stay clean. same problem any clues on what to do if i put it in 3 it drives perfect. Is there any way i can disconnect the overdrive? please help?
thanks- Aaron

cruisen_15 · #2 03-29-2008, 12:29 AM

so you say you cleaned your maf with carb cleaner? thats probably not good, you should use actual maf cleaner, it can be found at shucks and pep boys, you can also take apart the maf and make sure the soderd pins are still intact, one of mine was broken and my car was acting all weird, fixed it and it drove alot better, dont know if that will help with the overdrive problem though

o your the guy off cardomain, i love your red two tone svx!!! i really want to do what you did!!! it looks really good!

b3lha · #3 03-29-2008, 01:06 AM

What they told you doesn't make any sense.

The MAF measures the air going into the engine so that the ECU (engine computer) can work how much fuel is required. It is not connected in any way to the TCU (transmission computer). They are completely separate systems.

I cannot see any way that your MAF can affect your transmission.

Have you tried checking the TCU error codes? (see howto documents or http://www.svx-iw.com)

svxAL · #4 03-29-2008, 10:40 AM

going to try that later today i will let you know what i find

svxAL · #5 03-29-2008, 02:38 PM

i did the exsiting test and all it does is just blink fast and dosent stop. then i treid the previoues promblems one and got a code 33 witch is vehicle speed sensor #2 whats next ?

nextse7en · #6 03-29-2008, 03:48 PM

Next is swapping out your tranny resistor, followed by TPS testing or swap with a known good one.

Trevor · #7 03-29-2008, 05:17 PM

Quote:

Originally Posted by svxAL

i did the exsiting test and all it does is just blink fast and dosent stop. then i treid the previoues promblems one and got a code 33 witch is vehicle speed sensor #2 whats next ?

The speed sensor is obviously a logical suspect item. On the basis of hard evidence, you must now place it at the very top of your list.

svxistentialist · #8 03-30-2008, 07:20 PM

Quote:

Originally Posted by svxAL

I got my car to the tranny shop today and they say that the overdrive is kicking in and out. they say it can be driven like that and sespect it to be my mafs. so I took it off and cleaned it with carb spray.(throttle body clean as well) and put a new cone filter on so everything would stay clean. same problem any clues on what to do if i put it in 3 it drives perfect. Is there any way i can disconnect the overdrive? please help?
thanks- Aaron

Aaron, are you sure they said the mafs?

Because it is more likely to be the TPS [throttle Position Sensor] or a faulty atf temp sensor.

Or even it could be the transmission computer.

For most people overdrive will mean 4 Range. Just to clarify, do these guys actually mean the car is not locking up in top gear? Or that the car is shifting back to 3 by itself??

Joe

svxAL · #9 03-30-2008, 09:17 PM

the car will be in the D position and when im going from 35 to 68 it will etheir jump up 250 rpms or drop down 250 rpms continuously i pulled the codes from the tcu and only could get a code 33 but that was from the previous codes I tried to delete this by the blue wire thing i read about the also tried to touch the battery cables but the code stays. I also have a code 32 for an oxygen sensor the the ecu gives me i t didnt even clear that ethier so i dunno what to do now. PLEASE HELP!!
thanks Aaron

JLHollowX13 · #10 03-30-2008, 09:42 PM

if the rpms are dropping and raising as you give it gas/let off on the gas that sounds like the torqe converter to me. it sounds like its locking and unlocking.

svxAL · #11 03-30-2008, 09:58 PM

well even if it was the why when i put it in 3 position i dont have a problem at all whatsoever

JLHollowX13 · #12 03-30-2008, 10:06 PM

yeah, thats a good question, i know mine jumps rpms in D, i cant remember if i does in 3 although im in 3 all the time, except on the highway....

Trevor · #13 03-30-2008, 11:53 PM

Quote:

Originally Posted by svxAL

the car will be in the D position and when im going from 35 to 68 it will etheir jump up 250 rpms or drop down 250 rpms continuously i pulled the codes from the tcu and only could get a code 33 but that was from the previous codes I tried to delete this by the blue wire thing i read about the also tried to touch the battery cables but the code stays. I also have a code 32 for an oxygen sensor the the ecu gives me i t didnt even clear that ethier so i dunno what to do now. PLEASE HELP!!
thanks Aaron

You have already received the help you require as per previous post:-

Quote:

Originally Posted by Trevor

The speed sensor is obviously a logical suspect item. On the basis of hard evidence, you must now place it at the very top of your list.

TCU codes 32 & 33 cover speed sensors 1 & 2.

svxistentialist · #14 03-31-2008, 02:38 AM

If it still holds that code it still "sees" that problem. Follow Trevor's advice. Fix the speed sensor problem.

If you do both the code should go away and the lock/unlock problem.

Joe

PS
BTW when in 3 range the gearbox does not lock up. That's why you don't hear or notice the fault in 3. It only applies to D4 range, that is, to overdrive. It's a feature to reduce fuel consumption at steady speed.