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Old 02-07-2014, 10:56 AM
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Backfire?

I started my truck today and it chugged and died. It's cold So it's to be expected. I turned the key off then back on to cycle my glow plugs again and it back fired as soon as they came on. Truck started fine after but I've never heard it back fire? Is it normal? Could it of just ignited some fuel that was left from it trying to start?

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Old 02-07-2014, 11:34 AM
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Must of had an excessive amount of fuel sitting in a cylinder and when you cycled the glow plugs it ignited and if a valve was open gave you the backfire sound. It is pretty unusual to get enough fuel sitting in a cylinder to do that and be that explosive. Does this engine white smoke a lot when first started?
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Old 02-07-2014, 11:44 AM
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First start if it struggles I get a lot, if it fires up smooth it will smoke a little till it warms up a little. This is the only time it's ever backfired

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Old 02-07-2014, 11:46 AM
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Could starting with the chip turned up cause the excess fuel?

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Old 02-07-2014, 11:55 AM
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A backfire is unusual and yes having your chip turned up on a cold start is not recommended. My chip has a modified stock and fast idle position both of which work very well for those cold starts.
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Old 02-07-2014, 12:14 PM
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I'll try starting on high idle or my daily tune now, if I don't cycle my plugs on the first start on a cold morning the truck stumbles and coughs making a huge cloud of smoke. I t usually clears up a few seconds after giving it a little throttle. Figuring That's normal at 18 degrees

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Old 02-07-2014, 12:27 PM
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Don't start on high idle, the last thing you want is the rpms to jump up before the oil is circulating good. I always start in the stock position and switch to fast idle after about 30 seconds
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Old 02-07-2014, 12:36 PM
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yes it can absolutely spit back on a cold morning if doesn't fire right off , see it all the time , will not hurt at thing
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Old 02-07-2014, 12:48 PM
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Alright, I'll watch see if it hiccups anymore. Start it on my lowest tune as well

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