Cranks a long time before starting - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 01-28-2008, 10:50 AM   #1 (permalink)
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Cranks a long time before starting

My 1999 PSD seems to crank a long time before firing up. I am talking 4-5 seconds. Is that abnormal ? If so what do I do about it. I have had 1 other PSD (1997) and Cummins in the past and they always fired right up.

Thoughts ?
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Old 01-28-2008, 01:39 PM   #2 (permalink)
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What no comments yet ??
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Old 01-28-2008, 01:50 PM   #3 (permalink)
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4-5 sec seems just a little long. Mine usually fires after 4-5 compression cycles (guessing 2-3 sec), but sometimes takes longer when it's real cold.

You might have a slight leak in your HP oil system that's delaying the pressure buildup to 500 psi before the injectors are activated. Or it might be a GP issue, which is easy to check. Go up to the FAQ subforum and take a look at the Hard/No Start thread.

If you have a scan tool that will monitor engine parameters, you can check the HP oil pressure by monitoring ICP while cranking.
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Old 01-28-2008, 02:40 PM   #4 (permalink)
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Originally Posted by klhansen View Post
4-5 sec seems just a little long. Mine usually fires after 4-5 compression cycles (guessing 2-3 sec), but sometimes takes longer when it's real cold.

You might have a slight leak in your HP oil system that's delaying the pressure buildup to 500 psi before the injectors are activated. Or it might be a GP issue, which is easy to check. Go up to the FAQ subforum and take a look at the Hard/No Start thread.

If you have a scan tool that will monitor engine parameters, you can check the HP oil pressure by monitoring ICP while cranking.
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Old 01-28-2008, 05:54 PM   #5 (permalink)
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Fill your sig. in.. Where are you from, cold weather????? Being in a cold environment will affect it and the type of oil you are running in the cold weather. Try switching to a lighter oil if still experiencing hard starts
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Old 01-28-2008, 06:10 PM   #6 (permalink)
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Sorry about the Sig. I am in Kenmore, WA just north of Seattle. The starting issue happens regardless of weather though.
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Old 01-28-2008, 06:55 PM   #7 (permalink)
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Quote:
Originally Posted by perryt View Post
My 1999 PSD seems to crank a long time before firing up. I am talking 4-5 seconds. Is that abnormal ? If so what do I do about it. I have had 1 other PSD (1997) and Cummins in the past and they always fired right up.

Thoughts ?
My dad has a 2000 xl extended cab that has had a long crank since he had it, had 120k when he bought it, never dove into it, but I suspect HPOP oil system problems with it also. He had a no start hot problem. Obvious ipr ring problem, took it out and sure enough had a burnt out o ring, put a new ipr in it because he wan't to just replace the valve while he was there, starts fine hot, but still cranks long.

Only two possibilities if you ask me, low compression, or hpop build slow. I want to replace his hpop but he doesn't want to spend the jingle right now. He DOESN"T have low compression though, it starts fine no matter what the weather, just cranks long. Especially since I put the db electrical starter on, my 97 has always fired on about the second time around, can hardly turn loose of the key before it fires......
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