91 (302),getting codes 34&63
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Joined: Apr 2011
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91 (302),getting codes 34&63
91 f150 xlt lariet (302) she runs rich and jerks when driving. getting codes 34,63,122 replaced tps,evp sensor,plugs & wires, dist. & button,tab,pcv,cleaned throttle body, ran lucas in tank. HELP?
Elder User
Joined: Feb 2008
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From: ohio
Did you check the fuel pressure with a guage? Did you also unhook the battery for about 20 min after changing out the sensors? Also check fuel pressure regulator on the fuel rail,pull the vac hose to it and see if fuel comes out of the nipple,when they are bad it pulls fuel threw the vac line
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New User
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F.P. regulator
checking fuel pressure regulator, Should i relieve fuel system pressure to check for fuel in the (air hose @reg.) just wanting to do it right so i will get accurate results. need this truck running
Fleet Owner
Joined: Oct 2005
Posts: 20,786
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From: Kentucky
No, do not release the pressure. In fact I would suggest you cycle the key to the Run position 3-4 times before checking to build some pressure. Bill, aka subford, suggests to ground the fuel pump signal to get the pump to run full time. Cycling the switch a few times then checking should also work just fine.
Fleet Owner
Joined: Oct 2005
Posts: 20,786
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From: Kentucky
Define "Pressure is good". What is the value at idle with the vacuum line attached? with the vacuum line removed?
What did the vacuum line look like? Did you smell or see fuel?
What codes are you getting now?
FWIW you should be getting either 2 or 3 digit codes, not both.
What did the vacuum line look like? Did you smell or see fuel?
What codes are you getting now?
FWIW you should be getting either 2 or 3 digit codes, not both.
