95 explorer back fires when starting.
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More Turbo
Joined: Apr 2018
Posts: 743
Likes: 59
From: pine city washington
95 explorer back fires when starting.
my friend just bought this truck and the fuel pump went out. so we changed it and the filter. we left the fuel line to the filter from the pump off and ran the pump for a second to flush the lines and a bunch of black stuff came out. so we changed the filter again and added more gasoline truck started right up after backfiring in the air inlet a few times then it ran smoothly for a few minutes then died again. it had sat in the guy's yard for five years before my friend bought it. but when he bought it we put a fresh battery in and tapped the starter and it fired right up and we drove it home then the fuel pump died and we replaced it. what would cause it to backfire into the air breather?
Lead Driver
Joined: Sep 2003
Posts: 7,018
Likes: 210
From: SoCal
If it backfired into the intake, there is a good chance that it blew off a vacuum line or plug. After that, the engine will run poorly, or not start, and may throw a check engine light. Check the vacuum tree near the back of the manifold by the driver's side for loose hoses or missing plugs.
As to why it backfires, it seems to happen more with the EDIS engines, when the "waste spark" fires a plug at the wrong time, combined with a bank-fired injection system that's constantly spraying fuel into the intake port whenever the engine turns. It happens on my 4.0L if I don't hold the starter long enough for the engine to fully catch. The backfire almost always blows off a vacuum line or plug.
As to why it backfires, it seems to happen more with the EDIS engines, when the "waste spark" fires a plug at the wrong time, combined with a bank-fired injection system that's constantly spraying fuel into the intake port whenever the engine turns. It happens on my 4.0L if I don't hold the starter long enough for the engine to fully catch. The backfire almost always blows off a vacuum line or plug.
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