ok does a speed density motor have the esc in the memcial? and is the car supposed to have none, one or two friggen knock sensors? my haynes manual does not say which engines have esc module on the firewall or wich is in the memcial it just notes that it could have either one. and the wiring diagram shows 2 wires for knock sensors one white and one blue on opposite sides of the engine. well i have a connector on the white wire but on the blue one there is no connector just the wire. am i suppsed to have a knock sensor on both side? or just the one? this is a 91 z28 speed density motor with 305 to 350 swap.

 

i belive you have a memcal - my 91 tpi does. and you have ONE knock sensor.
but there is a difference between a 305 and a 350.

 

thanx tony. i knew there is a difference 305 to 350 sensors i just didnt know how many. but thanx for clearing that up about the memcal. i had read a bunch of posts about it but everyone i found was different or noone was sure about it and it just confused he crap outa me.

 

Yeah the maf cars use the esc module. The speed density ones do not. You should have one knock sensor with a dark blue wire. The 305 and 350 have different knock sensors. They are engine specific. All engines produce a different harmonic vibration when detonation occurs.

 

the knock sensor in my car is on the drivers side with a white wire. is it supposed to be on the pass side with the dark blue wire? like i said the haynes book i got is no help because it shows both sides in the wiring diagram. but it dosent specify which one i am supposed to have on my car.

 

I've got a proper wiring diagram for 90-92 speed density fbodies at the house. When I get home I'll post them here. Has someone been into this engine before? I don't think it matters what side of the engine its on.

Oh yeah, Throw that haynes manual away. Get a chilton and purchase a complete wiring diagram for your car for less than 10 dollars from www.ahdol.com

 

the connector for the knock sensor is white, at least it was on my 89, the temp switch for the aux cooling fan uses the same exact connector except it is black, again going by my 89. sounds like your wire for the fan switch may have come loose.

 

sorry it took so long. here ya go.

 

more

 

last one. These should help.

 

yeah my haynes book is like a coloring book compared to yours. and thanks for that. i think ihave it figured out now. and it also answred a ? i had about my cooling fans..
thanks a lot and if ya ever need to pick my brain or just bounce ideas off of someone feel free to ask.

 

Hey thats what the forums are for man. Good luck with your projects.