Question about Pontiac Grand Am

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Engine (Quad-4) turns over,starts momentarily,then quits; this will happen over and over, but it will not continue to run???

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  • johnlrichard Jun 01, 2011

    When the car was last running it would lose power and set codes relating to misfire and knock sensor. During this time it also set a PO335 crankshaft position sensor code. From engine sound, I suspected the timing chain tensioner was bad. I changed the tensioner, and the timing chain guides, everything else looked normal. After doing this the engine would crank, but not start. Tried it the next day, and it would crank and start running for a second or so then die, I could try it again over and over, and it would start for only a second or so each time, then die. Next day it would crank but not start at all. Is the crankshaft position sensor likely the problem?

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Hello and welcome to FixYa!

As a first course of action, I strongly suggest that you check the spark plugs. If the spark plugs is corroded, got big gaps or covered with carbon this issue occurs. You may have fuel flooding and spark plugs have no enough current to burn the fuel. Please have the spark plugs replaced if found out faulty.

Hope this helps and thank you for using FixYa! Have a good one!

Posted on Jun 01, 2011

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Check if all of the plugs are getting spark. You can do that by pulling the high tension wire at the spark plug end and over the engine check if all are getting the blue arc. Check if the fuel filter needs changing. The fuel supply may also not be consistent, check during start up if fuel is being supplied to the lines via the filter or the hose to the engine also after the engine dies. Fuel may just be only at the start up and when idling supply is low or gone.
I am unsure if your year has the fuel pump already, it may be the fuel pump relay or the fuel pump has gone bad.
Try cleaning the intake with carb cleaners just to rule out dirt in the sensors and the manifold. Check for leaks in the vacuum hoses and air duct from the filter to the intake. It may also be the IAC valve or the EGR for the EFI variants, IAC especially if the idling after start up and before dying is rough. It may need cleaning or replacing.
If you still have the carb or it was converted to carb you may need to adjust the fuel and air by moving screws by quarter turns on the carb and taking note of the movements. It could also be the jets for the fuel which may need cleaning. Carb cleaner would do the job but for tough dirt you may have to remove the carb and clean the internals. During cleaning you may inspect the valves and the parts for wear.

Posted on May 27, 2011

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