back in the 0087 club

[05_LLY]

I have a buddy with a stock lbz truck that hauls with the truck mostly, truck started doing this this spring and we cant fix it, put a new cp3 on it, put a lift pump on with new line all the way to the engine. Truck will do it in the same spot after the same haul every time, right after climbing a big long hill, it will start to throw a lil bit of black smoke and withiin a min after its in limp with a p0087, some times you reset its fine after others it will reset 5-6 times right after another? im at my wits end with it. WE shimmed the stock valve in it as well .

Lift pump, new line, new cp3, shimed valve, non of them has even changed the problem, let alone fixed it. The problem is definalty heat related just dont know what? maybe just a bad Rail sensor, thats prob gonna be our next try?

Any one finds a fix let me know, ill do the same!

 

[lotsofmiles]

Fuel lines. Stock vs parker

 

[RKTMech]

GM had issues with some of their LBZ fuel systems, parts in the pump would fail the vehicle could still run or not, but it would blow debris thru the high side of the fuel sys, possibly plugging the fuel supply ports in the fuel rails and damaging injectors. Check for plugged fuel supply passages in the driver side fuel rail and check the return rate of the injectors. Pay close attention to the front crossover fuel supply nipple of the driver side fuel rail vary small outlet hole doesn't take much to plug it up. Will still actually make full rail pressure at idle but wont allow enough volume at a load. TSB#08-06-04-029C DOC #2312651

 

[lotsofmiles]

I've got a FRP gauge going in too so I can watch it.
Haven't opened the box yet but I heard I have to splice into factory lines or buy an adapter somewhere?

 

[lotsofmiles]

Got back from another trip. Outside air temp was 80-90. I had a 6100 lb trailer and full of fuel in the bed tank(115 gallons). So conditions were close enough to compare to the trip with the 6 - 0087's.
Ran the factory tank down to 1/4 before I transfered any fuel. Fuel temps got up to 150-160 per efi and 120s on my gauge. Was running east on 80 thru ohio to 76 across PA then 70 to maryland, plenty of hills, nothing major tho.

No 0087s.

 

[05_LLY]

What are thinking fixed it, keeping the fuel cooler?

 

[lotsofmiles]

I think the new lines did the job.
Ran the fuel low and got it hot while towing no codes

 

[JD4440]

Crazy that line cause so much trouble. Might change mine out just to be sure it's not contributing to my problems.

 

[x MadMAX DIESEL]

Those lines only cause trouble if you don't have a lift pump...