My 94 ECRB Sierra 4x4.

[94Sierra4x4]

Well I pulled the plugs, 4 of 8 had oil on them, couple were pretty fouled up. I cleaned them up as best I could.
Not sure what my options are now, but I don't think I'll be putting much money into this motor.

 

[94Sierra4x4]

Picked up a FlowMaster 40 Series muffler today. 3" in 3" out SI/SO. Haven't added any pipe behind it yet, will later tonight. Sounds great though.

You must be registered for see images attach

 

[Tony_SS]

I had a single flow on my 90 Suburban... no cat, y-pipe and it sounded good to me too.

 

[94Sierra4x4]

Yeah stock manifolds, stock y-pipe. No cat, not sure if I truck even came with a cat, my pops can't think of it having one either. Anybody know better? haha.
Need to get a new clamp for the remaining pipe. It's on there but might hear a leak, threads on one side of clamp gave out.

 

[94Sierra4x4]

Must say - adding the fm40 has increased my fuel mileage, low end, and top end. Smoother throttle response, and freedom to be able to go over 2500 rpm and not go deaf. Mind you, having 8ft of straight 3" pipe is not a recommended set up. So anything should have been an improvement lol.

 

[94Sierra4x4]

Couple pics from fishing trip this morning.

You must be registered for see images attach

Picked up buddies aluminum boat from one of our camping/fishing spots.

You must be registered for see images attach

 

[94Sierra4x4]

Just adding this here so I can keep track of tune up part #s for my truck. Also if anyone reads this, feel free to recommend alternative & superior replacement parts. Thanks.

Plugs:
ACDelco CR43TS

Plug Wires:
ACDelco 718D

Serpentine Belt:
ACDelco 6K938 - would someone double check this is the correct belt? There's a bunch of different ones for just extended cab, or 4x4 without a/c. But I'm XC 4x4 with no a/c. Not 100% sure, and I've had problems with parts stores giving me the wrong belt on a few occasions.

Fuel Filter:
ACDelco GF652



Full TBI Rebuild kit.
Air Filter

 

[94Sierra4x4]

AC Delco CR43TS, Spark plugs gapped at .035"
Fram Fuel Filter.

Swapped out my Air-Aid intake for stock with choke collar removed.
Added valve cover breather.

Still runs the same. Sputter at lower rpms, slight miss. TBI Rebuild next I believe.
Also, when warmed up @ idle, oil pressure sits quite low. Oil pressure stays around 275 when warming up, drops to about half that, 135ish.
Found an oil leak running down onto pass. side of the trans bellhousing today.

 

[94Sierra4x4]

New ACDelco spark plug wires.
New Fram PCV valve

Swapped out the old 6" air cleaner studs for 4" ones.

 

[bambam78]

Just wondering, if you drive the truck and get it warm does the spitting and sputtering go away? My fuel pump was wreaking havoc with mine, hard start, sputtering, no power, replaced the pump and she runs like a new truck

Just a thought