IP retarding off idle?
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IP retarding off idle?
Is it at all possible that an ip is so worn that the pump retards off idle? Any pedal position above idle and the motor gets really quiet. Had the pump cranked up a good bit to give 1250* when working hard. But there was too much black smoke under power and I couldn't stand it. Now with the pump turned down i get alot of blue smoke at idle and right off idle. Replaced the CDR valve with no smoke improvement. Still gets 20 mpg though highway... So the motor about dead or ??
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the pyro is right in the right cylinder bank manifold...yea, 1250 is bit high, but I figure that the oil cooler jets on the pistons will keep things a bit under control... Now my max temp is 800* to keep smoke down. The injection pump looks original and the truck has 240,000 on the odo. I looked at the plate and couldn't find any rebuild info, which makes it seem like the ip could be original... With this kind of mileage is putting a new pump and injectors like putting a new basket on an old horse?? Kind of not worth it because the motor could be trash tomorrow??
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everything is gray colored on the motor including the ip, which leads me to think it is all original. Could the blue smoke be because of injectors popping at the wrong time from wear? I failed to mention it consumes about a gallon of oil between changes... when the oil is low the motor makes a loud ticking noise on decel...
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From: Nutter Fort, WV
Actually what may be causing the grey smoke is the fuel injectors are poping early and also probably not closing off completely.
Whaen you change the return lines, do all of them at once and replace the return line O rings at the same time.
If you replace the IP and/or injectors, get the ones for the 93 - 94 7.3 turbo engine since you have a turbo. Direct bolt in replacement.
Whaen you change the return lines, do all of them at once and replace the return line O rings at the same time.
If you replace the IP and/or injectors, get the ones for the 93 - 94 7.3 turbo engine since you have a turbo. Direct bolt in replacement.
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the smoke is definately blue though. its grey until warm, like any cold diesel but once its warm and at idle the smoke is not heavy blue but blue enough to faintly see it go past the window. It's a grey blue though if you stomp on it from a stop with a load and its faint but disappears once moving of course... Is it possible to have a quick IDI that doesn't smoke?? Quick is relative...by quick i mean... will my 0-60 still hover around 30 seconds empty and will it strain up small hills requiring a downshift?? The air quality laws here are very stringent, not to mention any slight amount of smoke and people get mad...
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Hello powerstroke6ltr. My experience has been that blue smoke is usually crank case oil....black is over fueling for the conditions....grey smoke until it gets hot is incomplete combustion......after it get hot is a sign of water.................
regards,
crossbones
regards,
crossbones
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My engine was smoking blue last year just like you have described. After I changed the IP and injectors in October the problem went away. (I had tried replacing the CDR - didn't fix anything). I have read on this forum that the IP timing sometimes starts to drift internally when the pump is worn out. I realized that mine was wearing out, so I changed it - what a difference!! Lots more power, and actually sounded more like a diesel.
Hope this helps you
Guy
Hope this helps you
Guy
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Originally Posted by powerstroke6ltr
that sounds exactly like my problem. If you put the throttle to the floor did it get really quiet but the diesel clatter came back the more you let the pedal return??
. Oh yeah, and it doesn't shake the truck as much at idle either
Guy
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<a href='http://media.putfile.com/MOV07031'>Click here to watch 'MOV07031'</a>
w/o the retard lever pushed
<a href='http://media.putfile.com/MOV07032'>Click here to watch 'MOV07032'</a>
w/ plunger pushed in...less smoke
w/o the retard lever pushed
<a href='http://media.putfile.com/MOV07032'>Click here to watch 'MOV07032'</a>
w/ plunger pushed in...less smoke
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