Question about 1995 Pontiac Bonneville
It started for about half a second then died and wouldn't start again.
Fuel pump? Listen for it to turn on when key is turned to on. May need to stand by the gas tank with the cap off. It should come on for a couple of seconds to pressurize the lines. If no noise, find the fuel pump relay under the hood and put your finger on it while someone turns key to on. You should hear it or feel it click. If not, need to check wiring in pump circuit. If it does click, but pump doesn't come on, check for power at the fuel pump connector at the gas tank. There should be power on the fuel pump wire when the engine is cranking. If not, again it's a problem in the wiring circuit. If it does have power and pump won't work, the pump has probably failed. The gas tank will have to be removed and pump replaced. Not recommended to buy after market pumps, spend the extra for genuine parts. It will save you grief.
If pump works and still a gas problem, check fuel pressure with a pressure gauge-should have around 40-50 psi. If good, check that fuel injectors are pulsing.
If not a gas problem, check for spark at the spark plug end of a plug wire. If no spark, ignition circuit will have to be diagnosed. Possibly a crank position sensor. Computer needs that sensor information to initiate spark.
Check for trouble codes from the engine computer.
Posted on Jul 19, 2013
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Posted on Jan 02, 2017
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