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  #1  
Old 09-29-2013, 06:15 PM
cpenn493 cpenn493 is offline
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Default 3.0L Sputtering on Start

Hey All. I've got a '96 with the Vulcan 3.0L OHV (5-speed). Roughly every month or so, I'll go to start it and it will start fine but then immediately settles into a sputtering idle where the tach bounces from 100-500 rpm. Then, not responding to any throttle to pop it up out of the sputter, it usually stalls. However, unlike the other threads I've read, this happens immediately after startup, not after 5 or 10 minutes of running or at a certain throttle level or speed. I'll try to start it a second time, and it will usually repeat the sputter for 5 seconds or so but then the revs pop up and it eventually settles back to a normal idle, as if it were a cold start. Finally, after the thing's finally running, it smells like unburnt gas from the exhaust. Any suggestions? Is this clogged injectors? A vacuum hose or throttle body problem? Open to any suggestions.
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Old 09-29-2013, 06:32 PM
4x4ranger99 4x4ranger99 is offline
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  #3  
Old 09-29-2013, 07:07 PM
rangerlocal rangerlocal is offline
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Default Re: 3.0L Sputtering on Start

Clean the IAC valve. It's probably sticking. Also try cleaning your throttle body if it's never been done before.
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Old 09-29-2013, 11:41 PM
LilRanger93 LilRanger93 is offline
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Default Re: 3.0L Sputtering on Start

Might be the fuel pump if it isn't the IAC or throttle body.
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  #5  
Old 09-30-2013, 07:25 AM
rangerlocal rangerlocal is offline
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Default Re: 3.0L Sputtering on Start

And don't forget that fuel filter!
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  #6  
Old 09-30-2013, 10:41 AM
aurikai aurikai is offline
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Default Re: 3.0L Sputtering on Start

All the suggestions here are Spot on with what I would look at in the same situation.

Also check that the electrical connector on the IAC is good. I was having hard starts too. On mine I found I could change the idle RPM by pressing down or to the side on the IAC connector. Popped it off and found corrosion on the prongs. Cleaned it up and that behavior stopped. So far my hard starts havent returned. Worth a look since it takes all of a minute!

As for the unburnt gas smell, assuming your IAC is the culprit, thats likely because the engine was starving for air so you were running rich while it was stumbling. If the smell goes away after a minute or so, then it should be nothing to worry about.
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