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1989 mercruiser starts then wont after you shut it off help

S

sledaddict82

New member
"i have a 5.7 1989 mercruiser.

"i have a 5.7 1989 mercruiser.It starts just fine after sitting about a day or so but after running it for a while (idles fine) then shutting off it will not start again! it will crank over just fine and it's getting gas and has spark, but will not start! it has plenty of juice on the battery. Anyone have any idea? i could use them ASAP thanks."
 
""and has spark," Wha

""and has spark," What does it look like? White or light blue? Will it jump 1/4"? Try another coil.

Try these tests when it happens.

Tests for Thunderbolt Ignition:

W/ignition key on AND BILGE WELL VENTILATED OF GAS FUMES!!!

#1 - Connect your voltmeter neg. lead to the engine ground and pos. lead to the white/red wire terminal at the dist. It should read 12 volts.

#2 - If 12 volts is present, remove the coil spark wire from the distributor and connect it to a spark gap tester to ground. Remove the white/green lead from the dist. terminal. Turn the ign. key to on and strike the white/green lead to ground. If there is spark, replace the ignition sensor in the dist.

#3 - If there is no spark, substitute a new coil and repeat test #2. Now if you get spark, install a new coil. NO SPARK, replace ign. amp.

#4 - In #2, if there is No voltage present, disconnect the white/red wire and check it again for 12 volts. If 12 volts is present, replace the ignition sensor inside the dist. cap. If no 12 volts present w/it disconnected--ignition amplifier is shot and must be replaced."
 
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