Wait to start cycles once - Dodge Cummins Diesel Forum
89-93 Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect...NO ADVERTISING

 
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post #1 of 7 (permalink) Old 12-31-2019, 08:12 PM Thread Starter
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Wait to start cycles once

Stock 1989 cycles once upon starting and then blows rich smoke tell engine is warm. Sometimes on bumpy roads the wait to start will flash. I am in down to -10 degrees threw the winter.


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post #2 of 7 (permalink) Old 01-01-2020, 02:07 AM
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Stock 1989 cycles once upon starting and then blows rich smoke tell engine is warm. Sometimes on bumpy roads the wait to start will flash. I am in down to -10 degrees threw the winter.
Air temp sensor in the intake side of the head might be bad or have a poor connection. The early trucks only cycle when itís like 30F and below. There is also a simple computer under the hood itís a small black box that controls the grids.

You can just manually control the grids with a push button.
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post #3 of 7 (permalink) Old 01-01-2020, 06:18 AM Thread Starter
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Doesn't it need to continue cycling? tell its warm. Im Looking to get a new black box but am having a hard time finding one. Or if it os even the best route.

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post #4 of 7 (permalink) Old 01-01-2020, 07:27 AM
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It will cycle for a few minutes till you reach 20mph or so.

R12 in the summer, Webasto in the winter; cassette tapes & SAE-20078 all year.
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post #5 of 7 (permalink) Old 01-01-2020, 05:42 PM
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It will cycle for a few minutes till you reach 20mph or so.
I have seen it stated that the grids will cycle only to a certain speed, but I think that is only for 2nd Gen trucks. I have run a 89 1st gen system and my current 93 system and neither one will drop out at any road speed. It is based on engine temp and air intake temp from what I can discern from my own observations.

Farmtruck....as mentioned the Non-IC trucks (89-91) had the grid heaters set to come on a much colder temp then the later 91.5-93 trucks. My 89 system would not "actively" cycle the grid heaters, that is the WTS light would come on unless it was -15*C or colder, but even without the WTS coming on the system would still passively cycle the grid heaters which you could see by the volt meter dropping slightly during warm up.

The Black box's would need to be found used, and they don't come up very often. Do you have a constant ignition 12V to your KSB, that can cause excessive smoke as well.

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post #6 of 7 (permalink) Old 01-17-2020, 10:14 PM Thread Starter
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https://www.genosgarage.com/product/...4327029/winter. Bought this and dont even have a spot for it my understanding is it was on the top of the motor in the intake area

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post #7 of 7 (permalink) Old 01-17-2020, 10:47 PM
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https://www.genosgarage.com/product/...4327029/winter. Bought this and dont even have a spot for it my understanding is it was on the top of the motor in the intake area
You canít find a place for it because a non intercooled truck doesnít use that!!!! Genos listing of 89-93 is completely wrong it needs to be 91.5-93. Your ksb wiring is just a simple jumper wire from the FSS to the KSB thatís it. That system has nothing to do with the grids. If you suspect your air temp sensor is bad it is in the intake below the air horn.
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