Help!! I have a excursion v10 Problem Need experts
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Help!! I have a excursion v10 Problem Need experts
I Have a 2000 excursion 2 valve 6.8L v10 Been in garage for 1 year as I tried to fix it. it just was missing real bad and found all clips on fuel injectors and c.o.p broke, found 13 followers bad, 10 lifters bad. Replaced timing chain seals and seated valves, new gasket etc. Did not touch short block, new high volume oil pump. it ran just fine purred like a kitten before. Short of misses. Now I start it after all this and white smoke which was partly bad gas but that's fixed. but back fires every so often and when it starts it has to turn over and over with no apparent compression, doesn't start till battery almost drained. when it ran out of gas it backfired pretty loudly. Also scanner is saying bank 1 is rich. I am thinking timing was set wrong but i don't know for sure. Is there a way of checking timing without taking it all back apart? Looking for all and any ideas Please!!!!! and or what to check?Please help!!!! it had always started fast in the past fyi
Fleet Mechanic
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There is no way that I know of to check the timing chain without taking the front cover off. But these are an interference engine so it would not have to be off much and you'd end up with bent valves or broken pistons.
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Hi Brian,
The scanner saying "Bank 1 rich" is often misleading. What can happen is that the electronics detect a rich condition and attempt to lean out the cylinder in that bank. A slight leaning doesn't change the test sufficiently to look normal so the bank is leaned a bit more. This can repeat until the bank is leaned to the systems limits.
You're having trouble starting the motor and a severe leaning of the motor could explain that. So could a faulty O2 sensor.
The place to start is to connect a good scanner/analyzer to the motor and checking the O2 sensor voltage and fuel trims.
The scanner saying "Bank 1 rich" is often misleading. What can happen is that the electronics detect a rich condition and attempt to lean out the cylinder in that bank. A slight leaning doesn't change the test sufficiently to look normal so the bank is leaned a bit more. This can repeat until the bank is leaned to the systems limits.
You're having trouble starting the motor and a severe leaning of the motor could explain that. So could a faulty O2 sensor.
The place to start is to connect a good scanner/analyzer to the motor and checking the O2 sensor voltage and fuel trims.
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Thank You both!!!!!!!
Thank You both!!!!!!!
BassFantasizer I can get those and you can tell me and idea of what maybe wrong? I dont know how to read fuel trims. I know one was way off.
Dweber85rc so if it was one tooth off btdc or atdc it would not cause this?
Thank You Both!!!
BassFantasizer I can get those and you can tell me and idea of what maybe wrong? I dont know how to read fuel trims. I know one was way off.
Dweber85rc so if it was one tooth off btdc or atdc it would not cause this?
Thank You Both!!!
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From: Las Cruces New Mexico
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Fleet Mechanic
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I am not 100 percent if 1 tooth off either direction would cause this kind of issue. I do know that they are interference engines and if it is off too much your putting in a new engine. If you are not sure if it was timed correctly the only course of action is to pull the cover and recheck it.
MUST GO FASTER!!!!
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From: Arizona
I am not 100 percent if 1 tooth off either direction would cause this kind of issue. I do know that they are interference engines and if it is off too much your putting in a new engine. If you are not sure if it was timed correctly the only course of action is to pull the cover and recheck it.
At the very least he will learn how good his compression is... of isnt. If the compression is very low, or is completely gone for some cylinders, then he need not waste his time tearing it apart, its *****ed, just pull it intact and find a rebuild shop, or a crate motor, etc.
