Engine/Transmission (1994 - 1998) crazy tach and shifting

[Swineheart]

I have just put some stage 2 injectors in my truck and a fluidamper. Now when I drive the truck I get a noise like a vacuum leak. the tach bounces all over the place, check engine light flashes, and the transmission shifts up and down all the time. any ideas what to look for?

 

[GrantP]

Not sure about the noise, but the rest of it sounds like the crankshaft position sensor. Did you get it hooked up again after the fluidamper install?

 

[Vaughn MacKenzie]

Did you get it positioned the right distance from the crank damper? I found a piece of cereal box carboard is about the right thickness to use as a feeler gauge. Don't use a metal feeler gauge, it can damage the sensor. Once you get your tach ironed out your shifting problem will go away.

 

[Missouri Mule]

Make sure the fluid damper has the notches or markings (non metalic) on it as the old damper. I have read other post where members had trouble with tach and fluid dampers.



If damper matches old one do as Vaughn MacKenzie suggested. I used 4 to 5business cards to set/measure gap.



As GrantP sugested check connector, make sure it is on good. Check to see if any piins are loose/bent.

 

[Swineheart]

Not sure about the noise, but the rest of it sounds like the crankshaft position sensor. Did you get it hooked up again after the fluidamper install?

I found that I had left a boost line to the water injection loose that was the noise I heard.

 

[Swineheart]

Did you get it positioned the right distance from the crank damper? I found a piece of cereal box carboard is about the right thickness to use as a feeler gauge. Don't use a metal feeler gauge, it can damage the sensor. Once you get your tach ironed out your shifting problem will go away.

I hope I didn't hurt that sensor I did us a metal feeler gauge. Do you think it maybe the tps from what I have read on other post it sounds like the same problem.

 

[Vaughn MacKenzie]

The TPS will cause shifting problems, but if the tach is not working perfectly the trans will act up no matter what. . . the PCM relies on a tach signal for controlling lockup.