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Old 02-26-2008, 12:51 AM   #1
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Default 02 Bonneville hard to start

This is kind of a unique problem that popped up recently. It starts just fine first thing in the morning or after work...etc. when it has been parked for a few hours. However, when I drive a short distance then shut it off and try to start it again, it will turn over but not want to start unless I feather the gas a little. Any idea what is going on here? Again it only happens when I start it cold, drive a few blocks, shut it down and then try to start it again.
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Old 02-26-2008, 09:16 AM   #2
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Classic symptoms of a leaky fuel pressure regulator. As the car starts to cool after shutdown, manifold vacuum pulls fuel through the vacuum line past the leaking diaphram of the regulator, and the fuel pools in the manifold.

Your next start will be rich for this reason. Feathering the throttle allows enough air to come in to compensate for the extra fuel. Try holding the throttle to the floor (this disables the injectors) and crank a couple times for a couple seconds to clear out that fuel and start again to see if that helps.

After driving, pull the vacuum line off the FPR on your fuel rail and smell it. If it smells like fuel (it shouldn't at all) replace it.

That'* the first thing that comes to mind.
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Old 02-26-2008, 11:58 AM   #3
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I agree... the fuel pressure regulator could be the problem. I had the same problem but it wasn't the fuel reg itself. It was the plastic vacuum line that runs to the reg. It was cracked. I was just beginning to check out the reg and when I pulled the vacuum line off it the other end came right off too. It was cracked almost all the way through where it comes out of the supply. Fixed the line and I've been 'good to go' for 10000 miles...
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