1291 code

[9453]

NO TEMP RISE SEEN FROM INTAKE HEATERS Ok got that part now what I did was eliminate the heater (Ca. warm wheather) to get a little more flow, I left the solenoids hooked up and insulated the heater ends in hope of fooling the computer no luck so wondering what you guys do to keep from thrown this code

[Mopar1973Man]

Strange... My IAT sensor is not even hooked up I've got a 2.2K ohm resistor stuffed in the plug so the temp is always 140*F in the manifold so it never sees a rise or fall...

[flagmanruss]

P1291 - No Temp Rise Seen From Intake Heaters Energizing Heated Air Intake does not change intake air temperature sensor an acceptable amount. Monitor & Set Conditions Temperature rise from intake air heaters is monitored for first 15 seconds of engine operation. DTC may be stored if initial Intake Air Temperature (IAT) sensor reading is 0-66°F (-17.8 to 18.8°C), Battery Temperature Sensor (BTS) and IAT sensor are within 10°F of each other, time between end of preheat and engine run state is less than 30 seconds, engine is cranked for less than 5 seconds before engine starts, preheat is completed before engine starts, post-heat is active and no IAT sensor or intake air heater relay DTCs exist. There's extensive trouble shooting in our code section: http://forum.mopar1973man.com/threads/2618-P1291-No-Temp-Rise-Seen-From-Intake-Heaters Since I have the same resistor as Mike wired across a toggle switch as an IAT fooler... should I be turning it off (back to the OEM sensor) then to the fooler after a minute or so?

[Mopar1973Man]

I've got no switch on mine at all... But I've got no grid heaters either because the IAT temp is 140*F all the time. So yeah if you got the switched unit from Prowelder I would leave it off and let the engine warm up a mile or so and then kick it on then you can get grid heaters for cold start and then flip over to the fooler...

[flagmanruss]

I made up my own from a harness from Caspers, resistor & switch from Radio Shack, wire from an unused trailer harness... Diagram from http://forum.mopar1973man.com/threads/3231-MPG-fooler-Design-phase I had a project box but decided just to put the switch through the knee panel.