Mechanics

ENGINE SUCKING SOUND NO POWER PO172, PO300, PO420, PO442, PO300

2000 Saturn SC2 • 91,000 miles

Starts fine, runs when cold. But when it get warm dies makes a sucking sound no power but idols ok. Was sometimes running at higher rpms

i changed the throttle positioning valve. Got codes they are po172,300,420,442,300. Checked hoses. Maybe low fuel pressure.
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Todd3037
February 23, 2012.




Hi sounds like you have a vacum leak possibly a intake gasket leaking or base gasket on throttle bore
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Billymac
Feb 23, 2012.
Just to add to this one I have very rarely seen bad throttle position sensors go bad on those cars. The most common things I have seen on those cars is a bad coolant temp sensor they go bad all the time. They cause running conditions no starts etc. When they go bad they read way to cold of actual coolant temp. So when the coolant gets hot they run too rich way too much fuel. Also inspect the inside of the connector if the terminals are blue or green instead of silver replace the connector. The sensors are only 10 and very easy to change. Do you have a multimeter to do some testing?Also I have seen clogged cats do that when they get hot they have much less flow when they go bad. Also check the fuel pressure but I would start with the coolant temp sensor thats what I would check first.

Saturntech9
Feb 24, 2012.

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