92 7.3 IDI engine problems
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Well I checked the selector. It doesn't make a difference. How much fuel would you say comes out of the return line? I got better than 1/2 of a gallon idling and couple of blips of the throttle for about 3 mins. When the IP is bad, does it lose pressure or make to much pressure? Does anyone have a link for checking timing?
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im not sure about the amount of fuel but that sounds like about normal my guess then and im no expert is either bad fuel like water or something or something in the fuell system is plugged and i would look at doing a compression test maybe a valve isnt opening or closing properly sorry i couldnt help more also there is no timing chain or belt its all gears unless something skipped a tooth
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Thanks. Would a lifter cause the truck to use excessive fuel? I've advanced, and retarded the timing. With the timing retarded, it seems to run a little better, and not smoke as bad, but still looks like a steam engine going down the road. It also has a ticking sound. Like it has a lifter that isn't pumping up all the way. I think I'm going to buy new injectors this weekend and see what that does for me.
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From: Faibanks Ak.
Yes a lifter can cause a dead miss.
When you crack the inj nuts the miss will not go away, it will miss on the cyl you have loose. When you crack them and nothing changes then you have found the offending cylinder, there may be more than one.
When you crack the inj nuts the miss will not go away, it will miss on the cyl you have loose. When you crack them and nothing changes then you have found the offending cylinder, there may be more than one.
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I guess it could be? But, what puzzles me is the fact that the truck sucked so much fuel. I did a pressure test on the fuel pump and it was had a lower reading than you guys say it should be. I got a reading of 3-3 1/2 psi. I don't understand how a lower fuel pressure is allowing the truck to consume so much fuel. Even though I removed the return line from the selector valve, is there a another place in the return that can be holding to much pressure on the system?
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From: Faibanks Ak.
A bad fuel filter will make fuel mileage go bad, anything that causes a motor run bad will cause it to use fuel. When you did the pressure test did you also check the volume. I also think those pressure numbers are a little low.
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Ok. Found my problem with the missing and smoking. #8 cylinder has 0 psi compression. All the other cylinders had 400 to 440 psi. So, now what? I've read on other threads that it maybe valves. I loosened the rockers before I read the threads, and I still didn't have any compression in #8. Can there be something holding the valve open? Or do these burn like gas engines do? I have no blow-by in the motor, no coolant in the oil. I ready don't want to put the motor. I'm going to do a leak down tomorrow.
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From: So. Jersey
Ok. Found my problem with the missing and smoking. #8 cylinder has 0 psi compression. All the other cylinders had 400 to 440 psi. So, now what? I've read on other threads that it maybe valves. I loosened the rockers before I read the threads, and I still didn't have any compression in #8. Can there be something holding the valve open? Or do these burn like gas engines do? I have no blow-by in the motor, no coolant in the oil. I ready don't want to put the motor. I'm going to do a leak down tomorrow.
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Well. Found the problem with the engine. There's not head on the exhaust valve. I can pull the stem of the valve almost completely out of the head of the motor. Yea!!!! I have another project now
. Lucky I've got a guy that is going to sell me a engine that has all the machine work done and rebuilt heads for $200.00. I just need to buy the gaskets to put it back together. Then swap them out. Thanks to all of you guys that replied to my post and I'm sure that I'll be back. You're all a great bunch.
. Lucky I've got a guy that is going to sell me a engine that has all the machine work done and rebuilt heads for $200.00. I just need to buy the gaskets to put it back together. Then swap them out. Thanks to all of you guys that replied to my post and I'm sure that I'll be back. You're all a great bunch.
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