Quote:
Originally Posted by GregWeld
AH HA!!!
Wiring always seems to come down to voltage/connection/grounds....
|
Exactly right... with the LS engines the wire connections and grounds are absolutely critical! I think a volt meter and some type of device that plugs into the OBDII port for reading codes is a must for diagnosing problems on the LS engines.
In my case there were no codes... so the problem was a bit more difficult to diagnose. I used a volt meter and found that the voltage to the fuel pump trigger was low. After two days of checking connections I found out the problem was a bad ground connection between the ECM and engine block.
Here is a shot of the ECM ground connection at the back of the engine next to the passenger side head. The problem I had was the bolt bottomed out in the hole before the ground was completely tight. The connection was tight but when I pushed on the wire hard I could move it. Another 1/8 turn on the bolt and there would not have been a problem
I ended up cutting 1/8" off the length of the bolt and then re-tightened, and this solved the low voltage problem. I also used star washers and some loctite on the bolt to prevent loosening of the ground connection.
Problem solved... thanks for the star washers Sieg.