97 Crew Surging issue

[glovemeister]

Hey guys,

Well this same issue has happened in the past. I'd be driving along and my truck would cut out and although not die, it would have drastically reduced power. I could hear the fuel coming and going in idle speed. So essentially the same pedal pressure to make it to 60 at one point in time would make the truck so 70 or faster when I heard more fuel going to it. It did it on a long road trip before for about 30 seconds and then was fine all the way home. It did it another time but really severe and I thought it was going to die and then it was perfectly fine. It happened again tonight and I could really feel it cutting out or losing power and then it would be no problem. I was even coming back into my town and got stopped and got a bad talking to by the deputy, but no ticket. Its weird I never ever speed, but the one time I am worried about my truck breaking down and hurrying home and I get talked to.

Oil is nearly due for its 5k change, here in about 300 miles. The first instance of this happening was at about 2k or so miles on the oil. It also had a new fuel filter and I did clean the FPR. I diesel up at one place only, and on many occasions it will run perfectly fine. It has ran good more times then it has ran bad I will say. I run Diesel Kleen, and also tcw3.

I did a cylinder contribution test with my AE here about a week ago and found no issues. I've got no leak in the valley. I do have a CEL but that is from a glow plug issue being burnt into memory.

So where should I start? My truck is reliable enough to make me think its ok for a long trip, but just enough mystery that I really do not want to risk breaking down.

[glovemeister]

Hey guys,


Well I ran for codes today am in my pickup now. I got code 1396 which is the same glowplug code I've been getting regardless of this issue. I opened my fuel bowl and emptied that. I didn't really see anything out of spec. I attempted to clean off the fpr through the inside of the bowl and I didn't get any crud there. I filled up the bowl with diesel kleen and sea foam. It started right up and I'm having no problems there. I looked at my AP sensor and it appeared to be ok. AE wouldn't let me check TPS so I suspect that is done through AP setting.

Here was my fuel filter after 4.7k miles. Is this bad?

[glovemeister]

Also, could there be a possibility that my chip could be causing this? It is a single stage 80 hp chip that a previous owner had a mech installed. My 1396 code has been illuminating when I pop out the brake pedal really hard. So I'm thinking that my chip could be a bit loose inside there causing these issues?

[Dannj]

have you put a fuel pressure gauge on the truck yet to test it?

[glovemeister]

In the mail. Well today I pulled the idm and shook it about, no water inside of it, or any way for it to get in. I also took a couple of driving session logs with ae. On my front tank, above the rollover valve there is a small 1/4 inch black hose that goes to the frame rails. Well when I was going to do the tank mod I removed a black circular plug piece that had a triangular entry point. I did this to see if it sped up fill ups. I left the back one alone.

I believe this issue has happened on both tanks, but could this cause some sort of an issue? I went ahead and put the plug back in, in case.

[glovemeister]

I read both of my data files and HPOP pressure looked good, as well as TPS.