01 f550 hard start rough idle when cold - Ford Powerstroke Diesel Forum
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Old 02-15-2009, 11:36 AM
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Cool 01 f550 hard start rough idle when cold

2001 f550 4x2 manual transmission. the colder it is the harder to start. below 35 or 40 degrees will drain batteries and require jumping. it will pull start quickly. good batteries and starter. little or no exhaust smoke while cranking. runs rough, low power untill engine warms up. glow plugs draw 20 amps ea. scanner shows good fuel pressure when first started. fresh oil change with fuel filter. injector buzz test ok. fuel filter and hpop res full. starts and runs fine for the rest of the day. if it had bad injectors or o-rings could it run ok when warm. i also have an 03 powerstroke. same fuel, same oil no problems.
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Old 02-16-2009, 08:52 AM
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Quote:
Originally Posted by trucker-dawg View Post
2001 f550 4x2 manual transmission. the colder it is the harder to start. below 35 or 40 degrees will drain batteries and require jumping. it will pull start quickly. good batteries and starter. little or no exhaust smoke while cranking. runs rough, low power untill engine warms up. glow plugs draw 20 amps ea. scanner shows good fuel pressure when first started. fresh oil change with fuel filter. injector buzz test ok. fuel filter and hpop res full. starts and runs fine for the rest of the day. if it had bad injectors or o-rings could it run ok when warm. i also have an 03 powerstroke. same fuel, same oil no problems.
@ my old job, they have an F-550 with the same setup(4x2 6-speed) with the same problem. How long does it idle rough for?
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Old 02-17-2009, 07:29 AM
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about 15 minutes at idle
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Old 02-17-2009, 07:39 AM
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injectors are worn badly , sicking cold until warm, try pluging it in and see if its better
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Old 02-17-2009, 10:50 AM
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this truck is a water well pump hoist. only used when needed. only has about 80,000 miles on it. could injectors wear out that quick? ran several test today. dtc's 1211 1280 1282. also getting 0284 and cylinder rotational vel #8 - 7.9,#3 - 1.8, and sometimes #4 gives a slight reading. icp d/c 27.5
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Old 02-26-2009, 12:19 PM
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CHECK YOUR FUEL PRESSURE WITH GAUGE WHEN STARTING AND AD A CLEAR HOSE BETWEEN FUEL FILTER AND INJECTION PUMP TO CHEK FOR AIR BUBBLES

-MIN 45 PSI REQUIRED 56PSI IDEAL
-ICP READING IS TOO LOW 0.83 VOLTS REQUIRED TO START (YOU MENTIONED ICP D/C 27.5 OR 0.275 VOLTS?)
CHECK IPR DUTY CYCLE IS NO MORE THAN 20-23%. HIGHER READING INDICATES HPOP SYSTEM LEAK.
-ICP READING AT IDLE SHOULD BE 0.85-1.0 VOLTS

ROTATIONAL VELOCITY ON #8 AND SOMETIMES CYL. ON OPPOSITE BANK ARE COMON TO BE OFF BECAUSE OF ENGINEERING FLAW IN HYDRAULIC AND FUEL RAIL FLAWS IN HEADS. (NAVISTAR SCREWED UP BIG TIME HERE) ANY SLIGHT FUEL DEVIATION FROM SPEC OR BUBBLES IN FUEL WILL GIVE CYL#8 AND SOMTIMES OTHERS NO CONTRIBUTION ON COLD STARTUP PROPER HPOP PERFORMANCE ALSO CRITICAL. IPR DUTY CYCLE IMPORTANT.

ALSO CHECK THAT ENGINE OIL TEMP AND INTAKE AIR TEMP ARE WITHIN 5 DEGREES OF EACH OTHER AND WITHIN AMBIENT AIR TEMP FOR PROPER GLOW PLUG ON TIME.
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Old 02-27-2009, 03:20 PM
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I'm having the same problem. If I've got air bubbles between my fuel filter and injection pump, what is the cause. Thanks in advance.
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Old 02-28-2009, 02:05 AM
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bubbles indicate a leak in fuel line between fuel pickup tube in tank and inlet fitting at fuel pump.

when engine is not running, fuel leaks out and air replaces void in line. on startup, negative pressure (suction) more air is intrduced in fuel line. in any diesel engine, a small amount of air (bubble) can cause a stall when introduced to severall cylinders

especially psd's because of a fuel and oil rail problem not allowing proper flow to certain cylinders. particularly #8. any slight deviation from oil (hpop) and fuel pressure from specifications on these engines and performance issues show up.
that is partly why ford is going bankrupt repairing so many problems on warranty.

check for bubbles and make sure you get fuel pressure in the mid 50's
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Old 03-01-2009, 10:02 AM
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just found out my hpop is not building enough pressure. will let you know what happen when i change it.
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