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WHEN COLD/WET WEATHER VAN WONT START. ELECTRIC FUEL PUMP TURNS ON BUT SOUNDS LIKE NOT GETTING GAS. CAP AND ROTOR REPLACED SINCE TOLD MOISTURE IN IT. TRIED STARTING QUITE A BIT AND DRAINED BATTERY. RECHARGED BATTERY AND STILL SOUNDS LIKE GAS NOT GETTING TO ENGINE. THIS HAPPENS EVEN WHILE PARKED IN THE GARAGE THANK YOU
: Sounds like you have
attacked the problem pretty well. Check the fuses. Do a
"pin" check for power and ground to the ECM. When you
replaced the ECM, did you use a new prom? If not, you
could have a faulty prom. Check fuel pressure and using
a Noid light check the pulse at the injectors. For your
information, the injectors will have 12-volts and the
computer momentarily grounds them to open the injector.
Your problems may be caused
by a faulty ignition switch or starter solenoid. Intermittent electrical
problems are difficult to trace. We would suggest first
checking the ignition switch and next the neutral safety
switch You are close to the right
track but check the fuel pressure during the no start
condition as you may have a faulty fuel pump. You also
could have a vehicle speed sensor problem
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sounds like its time for tune up wires and rotor cap and such..with age they break down and moisture is shorting some of this out..to test this using a spray bottle spray these wire down and listen for a snapping sound from the coil..this is proof of the water getting the old wiers wet..(condensate moisture)
Before you replace the injectors have them do an injector balance test. Normally wet weather does not effect fuel system. Sounds more like you have a crank or cam sensor acting up.
Do a tune-up, Plugs, rotor button and distributor cap. Not sure if your model has a cap or coil pack. When you say fires off and on do you mean it starts off and on or you get ignition spark off and on. If you have a cap, the rotor button can get worn down and not make good contact with the contacts inside the cap. When engine rotates the rotor button rotates inside the cap which produces spark through your plugs wires. If you have a coil pack, it could be going bad. If coil packs get moisture within it and diffuses the spark from going into the plug wires. Moisture and wetness causes a lot of problems with the ignition system, so it's best to apply Di-Electric Grease to the coil pack, wire boots on both ends. The grease stops moisture from getting into the components and sparks from jumping to the moisture.
tsb remove dist cap ,clean out breather holes i replaced cap and rotor at the same time. chevy has the problem with the 4.3l astro,s and blazer i have both.fixed the problem when buying the cap and rotor the directions inside will also tell you how to fix
could be a defective distributor cap(crack in it allows moisture in...moisture displaces the spark from where it needs to go). You could try to replace the distributor cap and rotor.
You could have a bad cold start valve, go to an auto parts store and buy the cold start valve and replace it. you will see it on the intake manifold also pull off the air cleaner or hose and get a can of berry mans carb cleaner and clean the throttle plate inside and out then lube the throttle cables with Wd 40 then try it, if it starts your set, if not try pushing the throttle all the way to the floor and crank for 15 seconds then wait one minute then slightly press the gas pedal and try starting again this is how you clear flooded engine. If it starts you know that the throttle plate or cable froze shut and would not allow air into the enginecausing it to flood. also check that the O-ring is not missing on the distributor cap which would allow condensation to form inside the cap shorting out the plugs and allowing it not to run. if it does it again pull the cap and look inside the cap if you see moisture then you need to replace the cap and rotor and O-ring.
I'd Start With Checking The Spark Plugs, This Can Be Done By Pulling Them Out And Setting Them To A Ground And Trying To Start it Result Should Be Spark Obviously. With The Cold Weather Involved Id Try Cleaning My Valves If You Wanna Go The Easy Way Buy A Can Of Fuel Additive Injector Cleaner And Run It through A Full Tank Of Gas.
you likely have a bad cap and rotor when the weather gets humid and or very cold moisture can get into the cap and cause a crossfire condition(firing on mulitple/wrong sparkplugs) and will prevent it from starting.My 1996 chev silverado has done this to me 2 years in a row on one of the coldest nite of the season and both times a cap and rotor fixed the problem.(the first time i bought the cheapest one I could find...not so cheap now though!) Hope this helps!
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