i have a 91 w350 the intake heater is not working checked the solenoids it is good i dont no how to check the timer but the wate to start light does work what controls it or is there something bad to go out

 

Intercooled or non-intercooled? The controllers are totally different.

How did you check the solenoids?

 

I took mine out this summer and so far I haven't missed them.

 

it has a intercooler i ran a jumper to the bat and can make it work just cant get it to work from inside

 

I am kind of a hacker so I would just hook up a manual switch and forget all the automatic crap. If it is below freezing, I would use the heaters. Sometimes, when it is really cold it would be better to have a manual switch than to have to wait while the heaters recycle. Sure would fix the voltage fluctuation


Just don't forget to switch it off or you could burn out the grid heater.

 

well Im dont wont to hack on my truck i wold like it to work the way it is suppose to work

 

When the WTS light comes on before a cold start (engine temp below 50 f), do you get a 20 second light or just a quick "bulb check" light?

 

the light dont stay on 20 second just 3 or 4 second at the most

 

Replace the air temp sensor.

 

is that the sender on the intake with two wires ?

 

One of them. You want the one closer to the front, the back one is the KSB switch.

 

My air intake heater is working but seems to be cycling far more rapidly than it should (or than it used to). Is this also a symptom of a bad intake sensor?

 

No. The PCM only looks at the air temp when you first turn the key on, from there on the info is ignored on our primitive old system. If the grids turn on on a cold start and don't turn on on a warm start then the IAT is OK.

Is the WTS light flashing?

 

i changed the censor with another truck that works did not help my truck

 

No, the WTS light is working perfectly and the heaters come on fine (for about 20 seconds) when I start the truck cold in the AM. From there until the truck warms up the heaters seem to cycle about every 5 seconds.