dead Crank sensor + tach signal?
Thread Starter
TECH Veteran
iTrader: (6)
Joined: Feb 2002
Posts: 4,766
Likes: 0
From: Phoenix, AZ USA
dead Crank sensor + tach signal? Is it possible to have a dead crank sensor but still have a tach signal?
In relation to my other post (about the engine not lighting off), I have a tach signal at both the scanner and my Autometer Tach (the Autometer is connected to the "white" wire out of the computer so the signal is comming through the computer) while I crank (~100RPM fluctuating....range 50-150 on a fast "swiching" of RPM).
To me this says the crank sensor HAS to be working because I don't THINK I could have a tach signal if the computer couldn't read the crank movement but I could be wrong.
As I said in the other post, I don't have ANY codes (other than the "MAF = no working" code because I am doing SD but that has been there for almost 2 years since I ditched the MAF).....
so?
really guys....I am
against a wall trying to figure this out..... 
In relation to my other post (about the engine not lighting off), I have a tach signal at both the scanner and my Autometer Tach (the Autometer is connected to the "white" wire out of the computer so the signal is comming through the computer) while I crank (~100RPM fluctuating....range 50-150 on a fast "swiching" of RPM).
To me this says the crank sensor HAS to be working because I don't THINK I could have a tach signal if the computer couldn't read the crank movement but I could be wrong.
As I said in the other post, I don't have ANY codes (other than the "MAF = no working" code because I am doing SD but that has been there for almost 2 years since I ditched the MAF).....
so?
really guys....I am
against a wall trying to figure this out..... 
