93 V8 4.2 / AT
07-10-2009, 09:06 AM
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93 V8 4.2 / AT
93 V8 4.2 AT
I've been having this intermittent problem for a couple of years . It's one of those problems I've never seen any reference to .
Here is the problem .
Car runs great for the first 20 mins and then the speedometer sputters back and forth to what ever speed you are doing 0 - 60 mph ( car is now at operating temperature ). A couple minuets after that the speedometer drops to O and just stays there . The Speedo then stars to sputter up and down again but there is a difference …. the engine then turns on and off like you were turning the ign on and off ? This all happens very quickly not enough for you to pull the car onto the side of the road . If you're in Stop and Go traffic then sometimes you will have to restarted the engine . This funky stuff only happens for a couple of mins and then the car runs great. What is it ? I hope you're not reading this and thinking you have the answer …. It's the Speedo transmitter ( G68 ) that is causing the problem . The Speedo transmitter is on the ZF4HP24A Auto Trans by the mulit switch . This sensor picks up the rotation of the LH driveshaft and sends the signal to TCU & or the speedometer . These sensors are build/designed like the ref / rpm / abs sensors running on other parts of the engine and chassis . As we are all aware that these sensors get heat cycled and eventually die a slow death. Not sure how this all ties into the end result of the car cutting out, but I do know that it is related to Heat .
Other than that the new tires and rim combination has worked out great . Tonight I'm picking up my and installing my new K&N filter. Next week I'm getting some exhaust modification done . One of the mufflers is coming off and new stainless steel pipes will be added .
Well that’s my news . Superdave .
I've been having this intermittent problem for a couple of years . It's one of those problems I've never seen any reference to .
Here is the problem .
Car runs great for the first 20 mins and then the speedometer sputters back and forth to what ever speed you are doing 0 - 60 mph ( car is now at operating temperature ). A couple minuets after that the speedometer drops to O and just stays there . The Speedo then stars to sputter up and down again but there is a difference …. the engine then turns on and off like you were turning the ign on and off ? This all happens very quickly not enough for you to pull the car onto the side of the road . If you're in Stop and Go traffic then sometimes you will have to restarted the engine . This funky stuff only happens for a couple of mins and then the car runs great. What is it ? I hope you're not reading this and thinking you have the answer …. It's the Speedo transmitter ( G68 ) that is causing the problem . The Speedo transmitter is on the ZF4HP24A Auto Trans by the mulit switch . This sensor picks up the rotation of the LH driveshaft and sends the signal to TCU & or the speedometer . These sensors are build/designed like the ref / rpm / abs sensors running on other parts of the engine and chassis . As we are all aware that these sensors get heat cycled and eventually die a slow death. Not sure how this all ties into the end result of the car cutting out, but I do know that it is related to Heat .
Other than that the new tires and rim combination has worked out great . Tonight I'm picking up my and installing my new K&N filter. Next week I'm getting some exhaust modification done . One of the mufflers is coming off and new stainless steel pipes will be added .
Well that’s my news . Superdave .
07-11-2009, 04:54 PM
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I would love to know the same thing, My 1990 has done that a few times ? but it has not done it since I replaced both the crank sensors not that that had anything to do with it ...lol
07-13-2009, 12:36 PM
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9 things about the Speedo transmitter
1) you need to have small hands like a child to take the part out .
2) the part is on the Drivers side of Transmition , front near the LH axel flange
3) cost is $57.00 CAD for the Part .
4) install wrong ST = 2x the speed on the speedo . The cut off for my cars speedo is 225 KPH ask me how I know this :-)
5) part numbers 012 409 191 G or 012 409 191 A
6) the Transmitter is snapped into place , no real hardware used to attach !!
7) The ST has plastic finger that holds it into place .
8) the electrical connection has be taking off first before you try to remove it ST .
9) time to do the job about 1/2 hour .
1) you need to have small hands like a child to take the part out .
2) the part is on the Drivers side of Transmition , front near the LH axel flange
3) cost is $57.00 CAD for the Part .
4) install wrong ST = 2x the speed on the speedo . The cut off for my cars speedo is 225 KPH ask me how I know this :-)
5) part numbers 012 409 191 G or 012 409 191 A
6) the Transmitter is snapped into place , no real hardware used to attach !!
7) The ST has plastic finger that holds it into place .
8) the electrical connection has be taking off first before you try to remove it ST .
9) time to do the job about 1/2 hour .
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