Question for the gurus re:surging

[mexicanjoe]

Ok diesel gurus: lately my '89 7.3 n/a has decided it wants to develop a slight "surge" @ engine speeds over 1400 rpm. It happens at normal operating temps and is not very noticeable,but it is slightly annoying...however when I climb a hill or "get on it" ;the surging disappears.. also present is light blue smoke upon gear changes... me thinks :CDR or perhaps air intrusion.... what say ye, oh noble turners of wrenches?

 

[riphip]

If the surge seems like more power, I would look at air intrusion. First, if you have not tried already, get a new fuel filter and fill with ATF when you get home, run it for about 10 minutes & let sit overnight. Next morning, run it like you stole it to see if it clears up the "surge".

 

[MtnHaul]

If you try the ATF trick listen to the engine after you fill the filter and start the engine--you will notice the engine sounds/runs a bit different when the ATF hits the injectors. When I did this I shut off the engine about 30 seconds after the engine sound changed--seemed to help.

 

[johnnolanstrtgld]

I had this issue and it tured out to be plugged fuel filter and water seperator(racor filter). After replacing the surging went away.

 

[austin92]

Mine does something similar to that if I let it run low on fuel. Like almost touching E lol


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