Engine RPM
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Senior User
Joined: Dec 2012
Posts: 151
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From: Richlands NC
Engine RPM
What is ideal engine RPM while cranking to get the motor started? While cranking I won't get over 200 RPM. The engine sputters and puffs smoke but fails to light. Absolutely everything else required for a start has been attained ie: ICP pressure 800+pis ICPv .28 IPR% 49 FICM sync yes, CKP/CAM sync yes, Exhaust back pressure is good. FICM V12 L12 M48 (from dieseltechron)
Injectors/PCM passes all test KOEO no faults whats DTC what so ever. Batteries are good and alternator is brand new. Batts put on trickle charge over night.
I have used all the awesome info from this forum to eliminate all the usual suspects and have read that the engine RPM need to be around 250. I may get 160-180 RPM and the starter is OEM not reman.
What do you all think.
Injectors/PCM passes all test KOEO no faults whats DTC what so ever. Batteries are good and alternator is brand new. Batts put on trickle charge over night.
I have used all the awesome info from this forum to eliminate all the usual suspects and have read that the engine RPM need to be around 250. I may get 160-180 RPM and the starter is OEM not reman.
What do you all think.
Thread Starter
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Senior User
Joined: Dec 2012
Posts: 151
Likes: 0
From: Richlands NC
I'll check it out. Would it stop the engine from starting though it is spinning between 160-180rpm
Fleet Owner
Joined: Apr 2012
Posts: 27,307
Likes: 549
From: Spanaway
Take the tension off the belt and see if you can turn the A/C compressor
by hand. If you can't then take the bolt out of the center of the A/C
compressor clutch and see if you can spin the pulley. It you can then
re-apply the tension to the belt and try starting it. You can run that
way if needed.
Sean
by hand. If you can't then take the bolt out of the center of the A/C
compressor clutch and see if you can spin the pulley. It you can then
re-apply the tension to the belt and try starting it. You can run that
way if needed.
Sean
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Senior User
Joined: Dec 2012
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From: Richlands NC
A/C compressor is not the problem, I removed the belt and checked the pulley and it spins freely
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Thread Starter
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Senior User
Joined: Dec 2012
Posts: 151
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From: Richlands NC
Fuel pump is actually good. Didi blue spring upgrade and have a mechanical gauge attached to regulator. Puts out 62+ psi KOEO and during cranking
Freshman User
Joined: May 2014
Posts: 45
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I had a truck like this the other day. Was working on it for a buddy. Truck wouldn't crank or anything. Starter was bad. Put a new starter in. It would crank and everything needed to start was achieved but it wouldn't start. I told the owner and he was like yeah it does that, hit it with some ether. I tried explaining to him it was a bad idea and waited till he arrived and let him do it. It fired right up. He says his truck will not start after sitting for a while, like weeks at a time, with out ether. I would not advised this at all. Just sharing my experience. I would think it would have to be something fuel related.
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Senior User
Joined: Dec 2012
Posts: 151
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From: Richlands NC
You and me both. I will be looking for a twisted fuel line tomorrow. Even though fuel comes out of the banjo when disconnected from the block it may still be restricted by some blockage
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