Do you have access to Cat ET? If not, can you read the diagnostic codes off of the monitor? Prob going to need ET to see what the output of the HPCR pump is during cranking. Do you know what RPM the engine was turning when it “ran away”?
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Cat 236d engine problems
- Thread starter paxfam1
- Start date
In do not have ET. The engine was turning around 3000-3500. When this occurred there was a squealing/screeching noise and it billowed black smoke out the exhaust my thought was it died because it plugged the DPF.
As far as codes go, the only one it set was engine horsepower over specification (something along those lines). The key was turned off within 10 seconds of this and it continued to run for about a minute and then slowly shut down. It ran perfectly smooth the whole time.
As far as codes go, the only one it set was engine horsepower over specification (something along those lines). The key was turned off within 10 seconds of this and it continued to run for about a minute and then slowly shut down. It ran perfectly smooth the whole time.
Nige
Senior Member
Not E459-2 by any chance was it.?
That's the one!
Nige
Senior Member
I’ll send you some information on a PM but it will be tomorrow before I can do it.
Thank you!
Ok so I found that it will start and run if I cap the fuel supply to cyl #1. Doesn't set any codes, but it won't throttle up. It will only run at about 700 rpms. Hooked #1 back up and plugged the remaining cylinders. It wouldn't start with cyl#4 capped. With cylinders 2 and 3 capped I got the same results. Started and ran, but no throttle response. It appears the pump is weak.
So I have a couple questions.
Is it possible the ECM could continue to fire the injectors with the key off? Just trying to figure out why this thing ran away,. There's definitely some oil coming out of turbo and the turbine is loose. Just seems so unlikely to have a turbo and a fuel system failure? Thoughts........
How does the ECM control injection pump pressure, Is it duty cycling the regulator on the pump?
So I have a couple questions.
Is it possible the ECM could continue to fire the injectors with the key off? Just trying to figure out why this thing ran away,. There's definitely some oil coming out of turbo and the turbine is loose. Just seems so unlikely to have a turbo and a fuel system failure? Thoughts........
How does the ECM control injection pump pressure, Is it duty cycling the regulator on the pump?
Nige
Senior Member
Those symptoms would appear to point to a major issue in the HP fuel system although it is strange there are no Codes generated.
It doesn't add up, but I agree. How does the ECM control injection pump output? Id like to verify ECM has control before hanging a HP pump on it.
thepumpguysc
Senior Member
- Joined
- Mar 18, 2010
- Messages
- 7,518
- Location
- Sunny South Carolina
- Occupation
- Master Inj.Pump rebuilder
I’m confused.. is the injection pump a hi pressure CR pump w electronic injectors.?? Or the small PFR pump w mechanical injectors.?
thepumpguysc
Senior Member
- Joined
- Mar 18, 2010
- Messages
- 7,518
- Location
- Sunny South Carolina
- Occupation
- Master Inj.Pump rebuilder
Ok thnx
I cannot locate that spec in SIS. In my opinion, you really need to get ET hooked to this machine so you can see what’s actually going on. Have you pulled the intake hose off to see if you had engine oil there? I don’t know of any delayed shut-down options on this machine so I would think the injectors would shut down as soon as keyswitch power was off to the ECM.
I agree, ET would simplify things. However my closest dealer is over 100 miles away, and a service call starts at 1000$. If I can verify the ECM inputs to injection pump, I am comfortable putting a pump on it.
There was oil in the charge pipe and the turbine is loose in the compressor housing. So it's getting a turbo.
DPF Is plugged and will either get cleaned or replaced.
There was oil in the charge pipe and the turbine is loose in the compressor housing. So it's getting a turbo.
DPF Is plugged and will either get cleaned or replaced.
. I missed this bit, this is what I needed to know. I'll hook my scope onto the SCV and check duty cycle from ECM and amplitude of the SCV
mjanko
Member
What did you ever figure out with this machine? I have a 236d and pretty much having the same issue as you. But mine started shortly after I had the dpf filter cleared