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Old 10-04-2018, 07:27 PM
v8volvo v8volvo is offline
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Join Date: Jun 2009
Location: Montana, USA
Vehicle: '86 745, '83 764
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No bubbles in the return line is good but did you see that when the engine was running well or when it was malfunctioning? Since you have an intermittent problem you want to watch for things changing when the engine changes how it runs.

If you saw no bubbles in the clear return line when it was running properly there still might be an intermittent air leak or restriction that would be visible when the engine is acting up but not when it runs correctly. Did you check to make sure the new fuel filter didn't get installed on top of an extra O-ring from the old filter?

On some engines replacing the IP without timing tools can work out OK but because there are so many variables that affect timing on these engines, you are less likely to get lucky on one of these. The dial indicator tools are cheap to get online and are probably common in shops where you are. Why not check the timing and make sure it's right? Even if it isn't the cause of the particular problem you are dealing with, incorrect timing can cause many other problems including hard starting, excess smoke, bad fuel economy, overheating, or blowing the headgasket or causing other serious engine damage if too far advanced. It's easy to check it and worth doing.

You can post a picture of what you are dealing with and that will let folks here help you more.
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86 745 D24T/ZF 345k lifted 2.5"
83 764 D24T/M46 155k
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