I'm getting very erratic CLT numbers on my air cooled type IV motor. I thought it was the cylinder head temp sensor, so I changed it. Problem still exists. After a certain period of running time, the CLT bounces up and down. Eventually it sits at 180.1F, and occasionally returns. I tested the new sensor off the car, outputs looks good up to 350F. Is there any reason why the reading would drop to exactly 180.1F? This is an issue since at 180F my warm up enrichment kicks in and dumps more fuel in. The sensor is calibrated properly, what could the issue be?
I could try to connect the sensor to the air temp channel, reprogram and see if the channel is bad... any other thoughts?
MS II v.3.0, code ver 2.6
Stock single wire head temp sensor.
Erratic CLT readings on a new sensor
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
Erratic CLT readings on a new sensor
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'72 914 2.0
MS II V.3.0, stock low imp injectors, PWM, Petronix points pickup + coil driver
MS II V.3.0, stock low imp injectors, PWM, Petronix points pickup + coil driver
Took a look at my thermistor file, appears that there are no entires above 346F in the table. So, any temp above 346 will return 180F as seen in table below. I tried entering in temp values above 300F, but the application won't let me. Any suggestions?
//-- Type = 0 (CTS) --
//-- Bias = 2490.0 --
//-- --
//-- Resistance tInput tComputed --
//-- ------------ ----------------- --------- --
//-- 4179.0 ohm 279.8K ( 44.0F) 44.0 --
//-- 317.0 ohm 355.9K ( 181.0F) 181.0 --
//-- 68.0 ohm 422.0K ( 300.0F) 300.0
#ifndef GCC_BUILD
#pragma ROM_VAR CLT_ROM
#endif
const int cltfactor_table[1024] EEPROM_ATTR = {
// ADC Volts Temp Ohms
1800, // 0 0.00 180.0 0.0
1800, // 1 0.00 180.0 2.4
1800, // 2 0.01 180.0 4.9
1800, // 3 0.01 180.0 7.3
1800, // 4 0.02 180.0 9.8
1800, // 5 0.02 180.0 12.2
1800, // 6 0.03 180.0 14.7
1800, // 7 0.03 180.0 17.2
1800, // 8 0.04 180.0 19.6
1800, // 9 0.04 180.0 22.1
1800, // 10 0.05 180.0 24.6
1800, // 11 0.05 180.0 27.1
1800, // 12 0.06 180.0 29.6
1800, // 13 0.06 180.0 32.0
1800, // 14 0.07 180.0 34.5
1800, // 15 0.07 180.0 37.1
1800, // 16 0.08 180.0 39.6
3460, // 17 0.08 346.0 42.1
3401, // 18 0.09 340.1 44.6
3347, // 19 0.09 334.7 47.1
//-- Type = 0 (CTS) --
//-- Bias = 2490.0 --
//-- --
//-- Resistance tInput tComputed --
//-- ------------ ----------------- --------- --
//-- 4179.0 ohm 279.8K ( 44.0F) 44.0 --
//-- 317.0 ohm 355.9K ( 181.0F) 181.0 --
//-- 68.0 ohm 422.0K ( 300.0F) 300.0
#ifndef GCC_BUILD
#pragma ROM_VAR CLT_ROM
#endif
const int cltfactor_table[1024] EEPROM_ATTR = {
// ADC Volts Temp Ohms
1800, // 0 0.00 180.0 0.0
1800, // 1 0.00 180.0 2.4
1800, // 2 0.01 180.0 4.9
1800, // 3 0.01 180.0 7.3
1800, // 4 0.02 180.0 9.8
1800, // 5 0.02 180.0 12.2
1800, // 6 0.03 180.0 14.7
1800, // 7 0.03 180.0 17.2
1800, // 8 0.04 180.0 19.6
1800, // 9 0.04 180.0 22.1
1800, // 10 0.05 180.0 24.6
1800, // 11 0.05 180.0 27.1
1800, // 12 0.06 180.0 29.6
1800, // 13 0.06 180.0 32.0
1800, // 14 0.07 180.0 34.5
1800, // 15 0.07 180.0 37.1
1800, // 16 0.08 180.0 39.6
3460, // 17 0.08 346.0 42.1
3401, // 18 0.09 340.1 44.6
3347, // 19 0.09 334.7 47.1
You do not have the required permissions to view the files attached to this post.
'72 914 2.0
MS II V.3.0, stock low imp injectors, PWM, Petronix points pickup + coil driver
MS II V.3.0, stock low imp injectors, PWM, Petronix points pickup + coil driver