Question about 1998 Pontiac Sunfire
There is a series of different problems that may cause engine stalling right after cranking.
Check air intake, filter and MAF/MAP and IAT sensors. This sensors determine the amount of air to be mixed with fuel and injected in cylinders. If they are dirty or bad you can get the problem. Sensors are difficult to test, a rudimental test may be done disconnecting them one by one and cranking, if situation does not get worse (no start or more difficult to start), then problem was the sensor.
Try cranking with fuel cap off.
Check if fuel is getting to cylinders and test fuel pressure using an hand tool gauge (eg Racor ).
Use same gauge to test the vacuum system, placing gauge in middle of fuel lines and spraying carb cleaner on vacuum hoses.
Check crank sensor.
Check EGR valve.
Check IAC valve.
If you have not done it already, do a code scanning. This car is OBDII, the scan can be done for free at Autozone, or for a small fee at the dealer or at any garage.
Posted on Sep 16, 2010
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Posted on Jan 02, 2017
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