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Onetonbb74s K5

1 ton k5 built for wheeling and camping.
Overview Gallery Discussion
Sierra trek was a successful trip, only smashed a bump stop, good trip IMO. Made it all the way to the top @ meadow lake. Now to prep for blazer bash. Tearing down the front end this week to see if water made it in the hubs, the river crossing brought a little water in the cab.

Curising in with fourdyce lake in the background...
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Tires peeled the inner fenderwell, cut out the carnage and stripped the hubs down looking for water intrusion.

Passenger side hubs and bearings were good, repacked them anyways. Get to the driverside and water made it inside and hammered my bearings. Must have been the rubicon trip back in June, never cleaned them out...doah. new bearings are in order again...

Pass side inner fender before...
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After...
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Driver side bearings...although I could run them, they feel rough and there fairly cheap so Im replacing the bearings and hub seal.
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Probably take steel wool to the spindle and make it look perfect again...
 
Everything was fine until the last couple miles of Flat Iron Mesa, Blazer kept dying and would restart fine...did the a couple dozen times and made it to the road where it wouldnt start at all. Pulled over in the brush on the side of hwy 191 and got a ride from @red EOD back into town. Grabbed the towrig and winched it on the trailer and headed back to camp.

Swapped out the fuel pump and it seemed to run fine, the next morning I took it to breakfast, then 7 miles out of town to run Crack and Back trail or the golden spike trail and as I was climbing up the Gemini Bridges trail it hesitated...didnt necessarly die, but no power and would not rev without stuttering...pulled out of the group and headed back to the staging area where @Bent77 gave me a ride back to camp to grab my towrig once again...
 
I swapped out the dist. Module because I had one and the stuttering continued. Just left it on the trailer and bombed home the next morning.

At home, I unloaded the blazer and it ran fine, jammed down to our pond and back about a mile one way and no problems...let it idle for 15 minutes and shut it down...ran codes.
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These are new to me codes, but I havent ran the scanner on this rig since i've lived here, so about 4 years...usually the egr code comes up.

The next day I ran it again down to our pond and crawled up a nice ledge and it started sputtering again...limped it back to the house. Swapped the fuel filter, same sputtering. Swapped the map sensor, same sputtering, swapped the entire TBI unit and same thing. Since I had all these parts laying around I figuered might as well...Im not sure where to start next, but the speedo and o2 sensor are next to be replaced, have to buy an O2, need to check the factory speedo cluster under the dash.
 
Don't think the lack of a speed signal would be the cause. Had an 89 suburban with a broken speedo for years and it drove fine.

Any junk in the fuel tank floating around?
 
onetonbb74 said:
I swapped out the dist. Module because I had one and the stuttering continued. Just left it on the trailer and bombed home the next morning.

At home, I unloaded the blazer and it ran fine, jammed down to our pond and back about a mile one way and no problems...let it idle for 15 minutes and shut it down...ran codes.
View attachment 314348
These are new to me codes, but I havent ran the scanner on this rig since i've lived here, so about 4 years...usually the egr code comes up.

The next day I ran it again down to our pond and crawled up a nice ledge and it started sputtering again...limped it back to the house. Swapped the fuel filter, same sputtering. Swapped the map sensor, same sputtering, swapped the entire TBI unit and same thing. Since I had all these parts laying around I figuered might as well...Im not sure where to start next, but the speedo and o2 sensor are next to be replaced, have to buy an O2, need to check the factory speedo cluster under the dash.
Click to expand...
To me it looks like o2 sensor or wiring
 
On the trail in Moab and then not again until the ledge at your pond, only happening off camber / on inclines?
 
It seems to happen switching from open to closed loop. I tried an o2 sensor, nothing changed.
 
I have a spare harness and ecm, didnt think of that, worth a shot.
 
I swapped my spare ecu, pulled the fuel pump sending unit and didn't see any cracks, swapped the fuel pump again and put a new screen on it (might as well). Replaced the fuel pump relay, changed spark plugs (AC delco cs43ts), cap and rotor...Went for another test run, seems better, power to do donuts and went down some steep ledges to the pond and floored it back up to my house.
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Had it on the scanner reading data the whole time.
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Im going to pull the engine harness and clean it up, inspect and re-install. I feel like there is something going on back there. Scanner lost communication breifly once I got back and parked it. I did get communication from the speed sensor, so thats good. It is way off but at least its reading.
 
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