high idle [Archive] - Diesel Place : Chevrolet and GMC Diesel Truck Forums

: high idle


alan46
10-10-2004, 10:03 PM
What is the normal rpm idle for a 95 6.5 with a standard 5 sp. Mines up in the 800 rpm . thanks guys

Texas Diesel Guy
10-10-2004, 10:59 PM
800 is too fast, are you reading this on the dash tach or a scanner?


Sounds to me like a temp sender has gone faulty, Intake Air Temp, Coolant, or Fuel are the likely 3. Get the truck up to operating temp with a scanner installed and see what those 3 sensors read.

alan46
10-10-2004, 11:02 PM
TDG This is on my dash tach.

Texas Diesel Guy
10-10-2004, 11:03 PM
Does it always idle this fast? hot or cold? Does the engine sound like its idling faster?

alan46
10-10-2004, 11:05 PM
TDG , this is standard , warmed up , but it does't sound fast .

tahoe2dr
10-10-2004, 11:08 PM
Doesn't the tach on these trucks take a signal from the alternator? Or am I thinking of another make? If so, is your alternator the correct P/N? Just stabbing at thin air here.