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jdl -> RE: 93 thunderbird running problems (3/11/2008 5:05:01 AM)
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quote:
ORIGINAL: goinstrong
Spraying carb cleaner in some throttle bodies will ruin them - instead be safe and use throttle body cleaner (different stuff - won't ruin any sensors or coatings). Start by checking fuel pressure like this: Get tool described below. Run engine. Shut engine and ignition off and remove keys. Get safety glasses and gloves on. Get a metal rod with a 90 degree end (like a 90 angle straight screwdriver) take cap off fuel pressure valve under hood on engine(usually black cap on intake fuel rail). This valve acts like a tire valve - ONLY it sprays HIGH PRESSURE fuel which can penetrate your skin (long rubber gloves would be good). Take screwdriver and quickly push in the tip of the valve (like letting air out of your tire) and quickly release. If fuel sprays out pressure and pump are likely good. If fuel trickles out pump may be bad or try ignition module on the engine distributor (if not distributorless ignition). Ignition also controls fuel pump. Check fuses also. You only need 3 things to start: fire , fuel and air. Air is always reintroducing itself when the car sits - so likely not that. Spark (fire)- even if you shocked your ass off the spark plugs could be fouled and not firing - double check that nothing (like burnt oil residue or carbon (highly burnt oil) chunk) is caught at the firing tip of the spark plug(s). Fuel - pump or computer are problematic here in most cases. Could also be a bent fuel line: trace the line from the tank and check for a kink or bad bend closing it off. Dirty fuel filter will also stop fuel flow (depressurize lines (like I described above) to check or replace filter). I've never had a Ford fuel pump actually crap out (even at over 200,000 miles) - it's usually the computerized circuits on the engine (subjected to high heat) that go first (like the distributor ignition module (bolted to the distributor with two TINY bolts) which also controls the fuel pump).
I've used carb cleaner--starter fluid--hair spray, once, never harmed any throttle-bodies. Using any spray can cause problems.
The way you told him to check fuel pressure is ridiculous! Yes, He can cycle the switch and press the valve, if gas squirts up, what does that tell him about pressure? Nothing.
He has to do the tests when the vehicle refuses to start, so how will it run???? When the vehicle refuses to start, he can, turn the key on, no crank, listen for the fuel pump, then bleed the pressure off the valve, don't recycle the key, then crank, then check for gas at the valve. If he has initial prime but nothing during crank, it will be obvious. That's an amatuer way to do it. Just to add, if your telling that person, that if gas squirts up, the pressure is ok???? I can't believe an intelligent person would say that. Good lord. Have a good day.
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