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Old 04-23-2013, 01:28 AM
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Strange Sounds

Hello all, I've got a 350SBC 95 year model with swirl port heads...anyway, the other day I was cleaning my truck out and I had my system on (sub,amp,cap) with only the accessory on. After some time I figured I better check to make sure my truck would still crank. After starting the engine and making sure all was ok I shut it off and proceeded again to only have the music on. After some time again my truck would not start ok I figured my battery was dead so after jumping it my truck started only this time it was weird. Normally, my truck rumbles and idles around 6-700RPM (headers,dual flow masters) but now, it doesn't want to start on its own during cold starts. I have to pump the gas pedal to get it to start and when it does start, it idles at 500RPM and once it warms up it goes up to 600RPM. After that, it'll start fine just no rumble, it's quiet, almost like a new car. Anyway, to make matters worse, there is a strange rattling sound coming from the bottom end of the motor that happens at random times (stopping, after revving engine, holding gas pedal at about 1000RPM range) I've checked the plugs and changed the wires, advanced the distributor about 2degrees, ran fuel system cleaner, checked all vacuum lines, changed fuel pump, changed fuel filter, checked injectors, checked battery, starter, and alternator...all of these are fine. I also noticed a great but of condensation at the end of the tailpipe even after the engine was warmed up and having run the engine a good bit. It doesn't stall while normal driving, no hesitation, great launches, but if I tap the pedal and let it go quickly in Drive or Reverse, it'll stall.
Any other ideas?

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Old 04-23-2013, 03:14 PM
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Sounds like the carb has developed a slight flooding issue either from trash in the needle and seat, too high fuel pressure, or float set too high.
Also check it for vacuum leaks.
With the truck at idle, shine a light down the carbs throat and see if you see any fuel dripping out of the boosters. If so, the timing is too low and the idle is set too far open to compensate creating a slight flooding issue at idle.
Dripping boosters can also be caused by fuel pressure being too high.
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Old 04-23-2013, 08:37 PM
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Sorry I forgot to mention

I the 95 Gen 1 has a TB while idling it has a steady stream with a slight dripping mixing in out of the injectors I opened up the throttle plate and all is clean I will admit I don't have the o2 sensor installed but I have been driving without one for over a year now with no issues...
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