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Old 04-13-2010, 12:45 PM   #1
PGM
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ISM Hard Starting

Hi guys, ive got an ISM Cummins engine in a Sterling, and lately ive noticed that its real slow to fire up.

It seems to happen at random, and when cold its takes a lot of cranking to get it to start, (too much) and then when it starts it seems to fire up on not all cylinders, then after a second or two all the rest of the cylinders fire.

When the engine is warm during the day, it seems to start quicker, but still not as fast as my Cat's or Detroits.

My gut feeling is either the fuel non return valve, or the crank position sensor ?

A few years ago, I had a similar problem on a M11, and they told me that apparently the crank position sensors have 2 loops, and that when one fails it will run on the redundant loop, but it takes longer to start. Sounds good in theory, but could it be this ?

Or is it more likely to be the fuel non return valve, and if so, where is this ? on the pump or near the pump ?

Thanks

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94 Kenworth K100E Detroit 470hp.
94 Kenworth T650 Cat 3406C 425hp.
96 International S3600 N14 460hp.
09 Sterling LT9513 MBE4000 450hp.
08 Sterling LT9513 Detroit 575hp.
07 Sterling LT9513 Detroit 500hp.
07 Sterling LT9513 MBE4000 450hp.
07 Freightliner Columbia 120 Cat C15 550hp.
06 Sterling LT9513 ISM 425hp.
05 Sterling LT9513 ISM 425hp.
04 Sterling LT9513 ISM 425hp.
04 Sterling LT9513 Detroit 500hp.
03 Sterling AT9513 Detroit 470hp.

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Old 04-13-2010, 09:14 PM   #2
Johnp3
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I could not find my Cheat sheet on the sensor but the sheet says it is 1K to 2K Ohms. in the coils. If my memory serves me correct it is A to D and B to C and each wire to ground is to Infinity. You want to check the sensor for damage to the tip also. Just a thought!
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PGM (04-14-2010)
Old 04-14-2010, 01:56 AM   #3
french277
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Comment avec la vitesse de départ cela devrait être environ 200 TRS/MIN ou donc si sous vous peut avoir le temps très difficile pour obtenir cette course.

Cependant je sais que le capteur de post-ion de vilebrequin peut aller mal et aussi là un sur l'arbre à cames {je connais vraiment que les modèles postérieurs les ont mais tôt un je ne sais pas si c'est là}

L'autre possiblty vous pouvez avoir la serrure aérienne dans le système d'alimentation qui peut causer durement le départ aussi.

Par la voie quelle l'année modèle c'est ? ?

how with the starting speed it should be about 200 RPM or so if under you may have very difficult time to get this running.

However I know crankshaft postion sensor may go bad and also there one on the camshaft { I do know the later models have them but early one I don't know if that is there }

The other possiblty you may have air lock in the fuel system that may cause hard starting as well.

By the way what model year it is ??

Merci,Marc
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PGM (04-14-2010)
Old 04-14-2010, 09:46 AM   #4
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Thanks guys, its a 2001 model ISM.

As for the cranking speed, it cranks really fast, and plenty of battery power, the part that gets me is that when it does fire, it seems to not run on all cylinders until for maybe a second or two, then progressively more cylinders fire until it idles nice.

No active codes.

Think its the sensor ? I might find out what its worth, and just replace it and see if it does the Job.

Dont think it might be the non return valve in the fuel line and the fuel is draining back ?

If it was an airlock, would it start at all ? and its been like this for a few weeks now.

The truck was laid up for 12 months, but we have been working it daily now for a few weeks, and the problem remains.
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94 Kenworth K100E Detroit 470hp.
94 Kenworth T650 Cat 3406C 425hp.
96 International S3600 N14 460hp.
09 Sterling LT9513 MBE4000 450hp.
08 Sterling LT9513 Detroit 575hp.
07 Sterling LT9513 Detroit 500hp.
07 Sterling LT9513 MBE4000 450hp.
07 Freightliner Columbia 120 Cat C15 550hp.
06 Sterling LT9513 ISM 425hp.
05 Sterling LT9513 ISM 425hp.
04 Sterling LT9513 ISM 425hp.
04 Sterling LT9513 Detroit 500hp.
03 Sterling AT9513 Detroit 470hp.

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Old 04-14-2010, 03:52 PM   #5
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You need 195 RPM and two revolutions to start, If you check the fuel preasure it will be going by 75 to 135 ish plus. You can check the solenoid power you need at least 9 volts on starting and if you disconnect the wire you should have 7 to 8 Ohms resistance. If you are sucking air or having a drain back problem, get someone else to start it in the morning and you look in the fuel tank. If you get a large volume of air, then you need to set up a clear hose on the inlet, and put in a loop to see if it is draining back into the motor back in the fuel tank. Got to go!
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