Stalling Cadillac

MRB646

MEMBER
2001 CADILLAC STS
V8
FWD
AUTOMATIC
138,650 MILES

I have a 2001 Cadillac STS. When driving along, it will suddenly stall out and not start again for about 20 minutes to a half-hour. During this time it will crank over fine with lots of cranking power but just will not catch. After the 20-30 minute rest it will start fine and keep running.

1 Reply

RASMATAZ

MECHANIC
75,992 POSTS

Next time it refuses to start don't wait for it to make up its mind-do below immediately to determine if its fuel or spark problem

Get a helper disconnect a sparkplug wire or 2 and ground it to the engine atleast 3/16 away from ground-have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, Do you hear the fuel pump come On when you turn key on? If not check fuel pump fuse and fuel pump relay if okay-check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, coil's resistances, cap and rotor, distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it and keep testing