1996 e350 460 dies under load code 542
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Trailering
Joined: Mar 2012
Posts: 22
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1996 e350 460 dies under load code 542
I'm having a hard time figuring this one out. My brother came into town the other day and drove his 96 e350 motorhome. It has an intermittent stumble at idle and dies when you stop at a stop sign. I pulled the plugs and did a compression test, it looked good. The plugs were pretty rusty so we replaced them along with the wires, cap and rotor.
The van had been sitting for a while so next i tested the fuel pressure. It had a hard time building pressure while not started and the pressure while running and pressure regulator unplugged was around 31 psi. Next i checked the codes and it came up with code 542 secondary fuel pump so we dropped the tank and replaced the pump.
the van still runs the same.
To recap:
-new plugs
-new wires
-new cap
-new rotor
-new fuel pump.
Its still throwing code 542.
Any help would be very much appreciated.
thanks
The van had been sitting for a while so next i tested the fuel pressure. It had a hard time building pressure while not started and the pressure while running and pressure regulator unplugged was around 31 psi. Next i checked the codes and it came up with code 542 secondary fuel pump so we dropped the tank and replaced the pump.
the van still runs the same.
To recap:
-new plugs
-new wires
-new cap
-new rotor
-new fuel pump.
Its still throwing code 542.
Any help would be very much appreciated.
thanks
Laughing Gas
Joined: May 2021
Posts: 1,177
Likes: 362
From: Anderson, California
Just curious.
My '95 Suburban with 6.5L turbo diesel was notorious for "oil pressure sending unit" failures.
So often they would fail, that I always carried a new one on board and the special slotted socket to remove and replace while on the road.
Your Van may have something similar not sending power to the lift pump (primary or secondary).
Codes are just a "Default" to get a mech started on his exploratory mission, I've found.
So, there are even the "Roll-over" sensors which may play a part, who knows. ??
I would check voltage to both pumps with key-on and Running. Might be a start.
The 6.5L turbo diesel had a Lift pump frame rail mounted that would push fuel to the high pressure injection pump.
Interestingly enough, if that engine had a vacuum pump leak, the default code was "Injection pump", way off base.
Good luck solving the mystery.
My '95 Suburban with 6.5L turbo diesel was notorious for "oil pressure sending unit" failures.
So often they would fail, that I always carried a new one on board and the special slotted socket to remove and replace while on the road.
Your Van may have something similar not sending power to the lift pump (primary or secondary).
Codes are just a "Default" to get a mech started on his exploratory mission, I've found.
So, there are even the "Roll-over" sensors which may play a part, who knows. ??
I would check voltage to both pumps with key-on and Running. Might be a start.
The 6.5L turbo diesel had a Lift pump frame rail mounted that would push fuel to the high pressure injection pump.
Interestingly enough, if that engine had a vacuum pump leak, the default code was "Injection pump", way off base.
Good luck solving the mystery.
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tabijan
1968-Present E-Series Van/Cutaway/Chassis
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Jul 7, 2014 10:32 PM
