ryan_wagnon

Ok ive got a stupid question. What in the world is this in the pic. Im still trying to diagnose my problem. If you floor the truck from a dead stop it will surge in and out at WOT. Almost like the fuel is cut of and cut back on but im almost positive thats not it. Ive put new fuel pump, fuel filter, and distributor cap and rotor. Where should i look next. it does not feel like a common misfire or anything.[IMG][/IMG]

ryan_wagnon

could this be a problem as well? Not sure but these plugs look pretty tired. lol. Just don't want to spend a arm and leg to fix easy problem im thinking.[IMG][/IMG]

gmstrong

replace those plugs and wires.then go from there.
BTW the 1 module with the line going to the TB is the egr solenoid,i forgot the other part with the large harness.Who the f*** mounted the map sensor like that?check the vacuum from the map sensor to the back of the TB also.Why is everything rigged you have a spring on the thorttle bracket for what?

ryan_wagnon

don't ask me about the rigging dude that is how i bought the truck lol.

DR132

Definitely spring for some new plugs.

gmstrong

then i just feel bad for you.I would never have bought a truck rigged up like that.I dont even want to look at the lifter valley or in the heads probably 15 pounds of sludge.

ryan_wagnon

i think we narrowed it down to i bought a bad fuel pump ill find out saturday.

DR132

While you're at it go for a new oil pressure switch, they tell the fuel pump to run while oil pressure is being made. they can be a bitch to access but they do fail.

1994Vmax

iTrader: (4)

Oil pressure sender only commands the fuel pump if the fuel pump relay fails. Otherwise the truck will start just fine without the oil pressure sender even present in the circuit. Don't believe me and own a TBI truck, unplug the sender and start it. If everything is the way it should be the truck will fire up and run normally. I did this multiple times to show people on my TBI's years ago......

As far as the OP's problem. Could be fuel pressure related, which a gauge would tell. Or a combo or one of any other sensor on the truck nearly.

The original circled part is the Electronic spark control module, not to be confused with the pickup in the distributor. And of course the driver solenoid for the EGR valve on the backside of the same bracket.

gmstrong

doubt its the fuel pump if you hear it running then its fine it only needs 12 psi to be happy.