Tim_D
Active Member
- Joined
- Aug 28, 2017
- Messages
- 236
In a previous thread we discussed some issues I was having with getting my engine running correctly, after initial installation into a new chassis. Very helpful people helped me to establish I had fuel injector (minor) and MAF (major) issues. The car runs pretty darned well currently.
However, I do have a question with regards to idle quality. When first started (cold), idle is very smooth. Once it gets to operating temperature, it "hunts" between 650-750 rpm.
A little background on the engine:
Essentially stock with a few exceptions:
1. LT1 3" MAF sensor and translator
2. Accel 30lb injectors (42s and a chip to be installed soon)
3. K&N cone filter
4. A bunch of stock-level replacement parts, including plug wires, crank sensor, coolant temp sensor, air temp sensor, knock sensor, oil pressure sensor, every vacuum line, all gaskets, timing chain
Things I've verified include:
a) Vacuum reads 18-20in consistently (I have an aftermarket vacuum/boost gauge from Auto Meter, run from the MAP sensor port)
b) No SES codes
I understand that the stock chip uses open loop idle at cold, and closed loop at warm. Also that aftermarket chips generally use open loop idle always. Is this because of stock idle quality issues?
Thanks in advance -
However, I do have a question with regards to idle quality. When first started (cold), idle is very smooth. Once it gets to operating temperature, it "hunts" between 650-750 rpm.
A little background on the engine:
Essentially stock with a few exceptions:
1. LT1 3" MAF sensor and translator
2. Accel 30lb injectors (42s and a chip to be installed soon)
3. K&N cone filter
4. A bunch of stock-level replacement parts, including plug wires, crank sensor, coolant temp sensor, air temp sensor, knock sensor, oil pressure sensor, every vacuum line, all gaskets, timing chain
Things I've verified include:
a) Vacuum reads 18-20in consistently (I have an aftermarket vacuum/boost gauge from Auto Meter, run from the MAP sensor port)
b) No SES codes
I understand that the stock chip uses open loop idle at cold, and closed loop at warm. Also that aftermarket chips generally use open loop idle always. Is this because of stock idle quality issues?
Thanks in advance -