cold start problem

Hi

It is RAM 92 5.9turbo.
When is cold like now close to frost, I need crank ~30second to start. When
they start, next start needs just one crank. I did check air heater system -
is not working (heating elements are OK).It is like computer is not giving
signal to relays. Do we have some temp sensor sending message to comp to
start air heating system? What fore is this KSB sensor on the intake
manifold? Do we have any cut-off fuel valve (sorry for my poor English)

 

I don't have any personal experience with that vehicle, but in general,
it could be that one or more fuel injectors is leaking, so that when the
vehicle sits overnight, fuel leaks out of the fuel rail into the
cylinder of the leaking injector (or injectors). When you go to start
it in the morning, the fuel pump needs a few seconds of run time to
re-fill the fuel rail and pressurize it, plus there may be air trapped
that has to be pushed out. Then, later, when you re-start, the fuel
rail has not had time to drain down enough to matter, so it starts OK.

Some vehicles also have a check valve in the fuel pump that can also
drain the system back into the tank if the check valve leaks, creating a
similar problem.

When it does finally start in the morning, does it run rough, and or do
you smell raw gasoline from the exhaust?

 

its a diesel Bill

 

Just seeing if you were paying attention.

Bill Putney
(To reply by e-mail, replace the last letter of the alphabet in my
address with the letter 'x')

 

Not likely, Bill. A '92 Ram 5.9 turbo isn't a gasoline engine
Normally we call it a Cummins B5.9 here in the US. I was thinking an
aftermarket turbo'd 360 too, until I saw him referring to grid air
heaters... ;-)

Not likely Raw diesel, maybe, but hopefully not gasoline! ;-)

 

Like Bill, I'm not really familiar with that engine, but I know the
general principles. Below a certain temperature, the grid air heater
should turn on. If they don't, it could be:

-The sensor that tells the system what temperature it is
-The ECM
-A bad connection
-A bad heater relay.

or maybe a few other things. I'd check out the temp sensor and the
relays first, then start looking for bad connections.

 

Air charge temperature sensor.

The KSB solenoid advances injection timing on a cold engine to reduce
white smoke. The KSB solenoid is controlled by the SBEC (computer)
based on input from the air charge temperature sensor.

There is a manual fuel shut off lever.

 

HI
what kind of electric fuel pump (in line) can I use with this engine?

George

 

If you're talking about a low-pressure "lift pump" then just about
anything that is rated for diesel and has adequate flow. Facet-Purolator
pumps are popular as lift pumps.

 

They display cods :12, 55
Any ideas?
Best George

 

12 and 55 are start and end of codes ... 12 means the battery was recently
disconnected/CPU lost power and 55 means end of codes. Without at least one
more code in the middle, these 2 will not be any help in troubleshooting
this issue.

Bob

 

That basically means "no codes". 12 means "battery disconnected
recently", or is always displayed if any other codes will be
displayed. 55 means "end of codes".