302 engine problems
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Junior User
Joined: Jul 2012
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From: Lockport
the vac solenoid for the egr has 47 ohms resistance but does not affect the idle when grounded. the egr valve affects the idle if I use a different vac source(heater control vac line)
Post Fiend
Joined: Apr 2004
Posts: 6,473
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From: Lafayette, IN
Okay, but you need to be checking voltages according to those links I posted. Also, you'll need a vacuum gauge/pump like this to test that the EGR valve is responding appropriately to vacuum:
I'd offer to let you borrow mine, but that's a bit of a drive from your place to mine.
Jason
I'd offer to let you borrow mine, but that's a bit of a drive from your place to mine.
Jason
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Joined: Jul 2013
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From: San Diego
Check your coil too. Those will sometimes crack internally, and as the coil heats up, the crack expands and the coil loses continuity. In these cases, the only thing that allows the engine to start again is to let it cool enough for the expanded metal to shrink again.
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Junior User
Joined: Jul 2012
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From: Lockport
have replaced: coil, plugs, wires, cap and rotor, icm, o2 sensor, vac lines, ignition assembly, all engine gaskets, pip sensor, as well as checked all wiring. have egr vac solenoid on order for tomorrow. have not looked at the eec though as its rusted t its bracket. the exhaust is not plugged as its currently free flowing with 2 glasspacks where the pre cat used to be. that's as much as I can think of at the moment.
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Junior User
Joined: Jul 2012
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From: Lockport
well its still running like ****. smells of oil and cant keep running. sadly im thinkin its gonna end up needing rings :/ I knew I should've replaced them while the engine was apart. it only acts up after the engine warms up and I was told that the situation sounds like rings.
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Joined: Jul 2013
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From: San Diego
Take it off, put a clean and new piece of hose in the input end and blow through it. It should have no resistance at all after the liquid comes out. You can also put a fuel pressure tester on there, start it up and rev it to see if pressure drops a lot as the rpms go up.
In my experience though, plugged fuel filters haven't caused idle problems, but manifest when you go to accelerate and it needs the extra fuel. That doesn't mean it's not the problem, but it isn't the first place I'd look. Fuel filter is only like $2 though, so I'd just change it if it hasn't been done in a while. There's probably some rust in the tank due to all that sitting it did, especially if it wasn't full of fuel during that time. Moisture will collect in the head space and cause it to rust from the inside out. You might do well to change the fuel filter every few months until all that crap gets sucked out of the tank. Keep the tank full too so the rusting process is halted.
In my experience though, plugged fuel filters haven't caused idle problems, but manifest when you go to accelerate and it needs the extra fuel. That doesn't mean it's not the problem, but it isn't the first place I'd look. Fuel filter is only like $2 though, so I'd just change it if it hasn't been done in a while. There's probably some rust in the tank due to all that sitting it did, especially if it wasn't full of fuel during that time. Moisture will collect in the head space and cause it to rust from the inside out. You might do well to change the fuel filter every few months until all that crap gets sucked out of the tank. Keep the tank full too so the rusting process is halted.
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From: Lockport
ok so i took the inline filter off and it was plugged solid. i took it to a friend of mine and he will be handling the tank and checking the in tank filter as well as testing the pump. i replaced both 10000 miles ago but i didnt replace or clean the tank. after thinking more the in tank filter may be clogged. the storm last night took out the tree behind my house so im gonne be busy for a few days.
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From: Lockport
im not sure why my messages are not showing up. -_- anyways the diagnosis was that the pump wasnt making enough pressure or volume. 35 psi tops and less than 5oz after 3 key turns. replaced pump, sock and tank. old sock was so plugged that the pump and engine kept running dry. truck now drives alot better but on another note i lost 4 quarts of oil on a 15 mile ride and its not leaking externally. onl thing not replaced internally was the rings.
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