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2005 Cadillac STS Base 4dr Sedan V6

2005 Cadillac STS
Trim Info:
Rear Wheel Drive, 4 Door Sedan, Mid-Size
17 mpg city / 24 mpg hwy
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July 24, 2012, 2:55 pm

Chima M

Question: jerking on second gear

while accelerating from a dead stop, the car bucks and jerks but recovers afterwards. it also happens when i need power to overtake, if i step on the gas pedal, it feels like the car stutters (i have to let go off the pedal slightly for it to recover). engine light was on but after the crankcase was flushed, it went away. i was told by firestone that i need to replace the engine coil, a spark plug and a plentum gasket? any help with this issue?

July 29, 2012, 8:40 pm

Elizabeth K

It sounds like your check engine light came on and when a shop had your car in to change the oil, they scanned the codes and then reset the light. Their diagnosis is an ignition coil, spark plug and an intake plenum gasket. The fault is still there, and given enough time, the light will come back on again.

Without knowing what the code is, what tests they ran or the results of those tests, I cannot say if their diagnosis is valid. If you get the codes scanned again and post them, I can point you in the proper diagnostic direction--or the code should be in any paperwork they gave you.

Or you can have it diagnosed at another shop to see if the conclusions they draw are the same.

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September 3, 2012, 2:57 pm

Chima M

i was told by Cadillac that i need to replace engine 2 spark plugs and a new ignition coil. as for the plentum gasket, i really dont know how to diagnose that

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