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2000 olds bravada: check engine light..cap..rotor..it wont start

Customer Question
My 2000 olds bravada, 4,3...
My 2000 olds bravada, 4,3 vortec has been skipping and running rough in the rain. I took it to one of the chain auto parts stores that check engine light codes and they said it was miss-fire code. I replaced the plugs and wires last weekend and was going to replace the cap and rotor today, but it won't start. It cranks and cranks, but doesn't catch. I took the air induction off and could smell gas, so i don't think its the fuel pump. Could it be the coil? It has run since i replaced the wires, but it sat all day yesterday in the rain and won't start today. Where should I look next?
Submitted: 5 years ago.Category: Chevy
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Answered in 8 minutes by:
6/3/2012
Chevy Mechanic: Bill, Chevy Technician replied 5 years ago
Bill
Bill, Chevy Technician
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Hello,

Actually the cap and rotor are a common cause. Have you removed and inspected them yet? Remove the coil wire from the coil and check for corrosion at both sides. If you have a spark tester you may want to use it to check for spark at both the coil wire and at one or more of the spark plug wires. A spark tester is available at any auto parts store and they are not expensive.

I would check the coil wire first for corrosion. Sometimes they arc to the trans dipstick tube and cause a misfire. Check for evidence of arcing near the dipstick tube if the wire is routed where it touches it.

Bill

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Customer reply replied 5 years ago
But why does it happen predominately when it rains not when it's dry out? I have heard of a common problem with S series trucks that the lower half of the distributor cracks with time and causes the same issue? If that is the case do I need to replace the whole thing?
Chevy Mechanic: Bill, Chevy Technician replied 5 years ago

Because moisture even if it is just high humidity will help the high voltage to arc to where it isn't supposed to arc to. The good news is that definately makes it sound like a secondary ignition issue. I would definately check that coil wire and dist cap. I have had many S trucks and drive a 2001 with a 4.3 as my daily driver. There are not major issues with the 4.3 distributors other than occasionally corrosion and wear to the cap which usually doesnt show up until relatively high mileage. Back in the day distributor caps were replaced every 12,000 miles. :)

Bill

Bill

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