|08-09-2007, 01:23 AM||#1|
Join Date: Dec 2003
Location: Fullerton, CA
2003 VUE 2.2L
Stopping for gas; engine stumbles on restart
I've been having a problem lately where my 4cyl Vue has a lot of trouble restarting. It seems to happen every time I stop at the gas station; the engine is still warm (not overheated) and it will often take two attempts before it catches. It always starts (so far), but it may take a bit of cranking and giving it a little gas.
However, cold starts have no problem, nor do I have trouble after the grocery store (still kinda warm).
Any idea what could cause this?
Silver '05 FWD V6 Automatic
Replaced Blue '03 FWD I4 VTi
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|08-09-2007, 05:28 AM||#2|
Join Date: Oct 2002
Location: San Antonio, Texas
2008 Astra XR
2008 SKY Red Line
Re: Stopping for gas; engine stumbles on restart
Probably a fuel problem. Because the symptoms are similar, it may be overfueling due to something like leaky injectors or regulator or underfueling due to a faulty pump check valve. Hard to say as an absolute since a very dirty air filter can exhibit similar issues. I also wouldn't automatically rule out an ignition fault.
At the next opportunity, before you crank the engine, put the throttle on the floor and keep it there while you crank the engine. This cuts off fuel. If the engine starts easier, then you have a good idea that you are overfueling at start up. If this does nothing different, then it may be underfueling due to the check valve or pump. You could test this by turning the key from stop to run two of three times to prime the injectors before starting the car. Only way to start a proper diagnose this is with a pressure gauge. If this test does have an affect, then you'll likely want to get the car to a shop for a proper diagnosis and repair.
And pumping the pedal does nothing. That's a carry over from the carburetor days when doing so made the accellerator pump shoot fuel down the venturi into the intake manifold. Electronic FI does this same thing as soon as you turn the key to the "run" position and as you're cranking it.
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