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Old 02-07-2008, 01:30 PM
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silverado 350 Engine

Can some one tell me what causes an engine to not start in the humid air. I am trying to start my 98 silverado and it will turn over fine but not catch on. I know it have to do with the ignition. What could it be. In my vintage bug its the comb i believe of the coil and the points in the distributer that cause the engine not to catch in humid air. But with my truck its new technology

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Old 02-07-2008, 01:55 PM
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Can you hear the fuel pump running?
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Old 02-07-2008, 02:08 PM
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pretty sure that was replaced a while back however i can smell gas, meaning its flooded right. Your talking aback that sound that happens when you turn the ingnition to on right
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Old 02-07-2008, 02:27 PM
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new technology means humid air has nothing to do with it.

If your motor has fuel but no spark then there are many things that could be wrong,

1. security system is tripped
2. crank sensor is bad
3. ignition module is bad
4. coils, plugs, wires, distributor are disconnected

Then even if your engine has fuel it may not start because the fuel pump is not pushing enough pressure most EFI takes 50-70 psi to run if you only have 35 it won't start but it might smell like gas.

My advice would be to pony up the 70 bucks and hour to have someone diagnose it. Then replace what they say is wrong.
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Old 02-07-2008, 04:17 PM
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You didn't mention how many miles it has . If it has 100,000 or so and the cap rotor and wires haven't been replaced ,it would be about time to do it .
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Old 02-07-2008, 04:36 PM
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I have seen condensation form before underneath distributer caps and the moisture will keep one from fireing. I usually lift the cap up and spray the underside of the cap good with WD-40 to get rid of the moisture, put cap back on and then start it up.
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Old 02-07-2008, 09:01 PM
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But in MA, in the winter, the air can't be that damp...Can it?
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Old 02-07-2008, 09:24 PM
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Quote:
Originally Posted by Double_v23
But in MA, in the winter, the air can't be that damp...Can it?
If they are having a winter like us..... Yes

Shane
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Old 02-07-2008, 09:25 PM
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All I know from winter is cool dry air but I suppose things can be quite a bit different when you factor in the Atlantic Ocean.
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Old 02-07-2008, 09:45 PM
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We have had heavy rain the past couple days,none today though.
Shane
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Old 02-07-2008, 10:54 PM
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98 Silverados have a fuel pressure regulator the goes bad and sucks fuel through the vacuum hose that makes them smell like fuel. When it is hard to start, cycle the key on and engine off several times pausing for no more than 2 seconds. Do this real fast. If it is the pressure regulator it will start on the 4th key cycle. You can check if that is the problem by pulling the vacuum hose off of the regulator and look for any wetness after turning the key on engine off at least twice.
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