95 s10 backfiring - S-10 Forum
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post #1 of 3 Old 07-21-2015, 02:50 PM Thread Starter
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95 s10 backfiring

I recently picked up a 95 s10 with 177xxx miles Its a 5 speed 4.3 vortec TBI? (Has a carb) Sorry I'm new to this truck. The truck idles fine and most of the time runs perfect, but sometimes it'll fall on its face and back fire leaving me with 0 power, it typically back fires around 2_3/4K RPM AND UP! the worst day I had with the truck I let it idle for 30 min in 100f weather before leaving work so it would be ice cold but it started back firing at any RPM range Was wondering if you guys had any insight on what this could be and maybe if that has anything to do with bad gas milage and low on power issues. Thank you

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post #2 of 3 Old 07-21-2015, 04:15 PM
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Re: 95 s10 backfiring

A 1995 TBI has no carb stock. Throttle Body Injection

Sounds like a weak fuel pump or plugged filter.

You should have 12-14 psi running. Less than 10 psi and you will have problems.

I'm not old, I'm ripe - My LS Jeep project
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post #3 of 3 Old 07-22-2015, 08:56 AM
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95 s10 backfiring

Sounds to me like it's actually running rich. Granted with my truck my injectors were literally pouring over the top and it would just stall out if you cranked it. And backfire at speed. Make sure the injectors aren't dripping or puddling over the top. Could be clogged, tbi needs rebuilding or injectors are clogged. That's the first thing I would check, if no leaks and it's spraying clean then check pressure. And I replace my fuel filter every time I change the oil it's a safe 15 dollars every 3000 miles imo. Also a bad egr could cause it too. Check you ignition timing and coil, if the timing is way off it can cause power loss and backfire.

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