Question about Cadillac CTS

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My 2004 cadillac cts suddenly starts missing a few days ago. First i thought is was the plugs so i went ahead and bought six plugs and had them installed. The problem did not go away. So my Mechanic ran a test and it said that the car is misfiring from cylinder 1, 2 & 5 and then it said 1 & 5. However my mechanic said that there seems to be a leak in the vacuum and that could have bin the problem. However, he made the repairs to the vaccum but the problem is still there. I really need some help on this one and i think my mechanic does to. Thanks

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Hi

Thanks for using FixYa. Check the battery. If you do not have sufficient voltage and cranking power, the car simply won't start. Have someone attach booster cables to your battery if the engine seems to be turning over slower than normal. If the battery seems charged, and the starter motor still doesn't turn the engine, the problem may be in starter motor itself, or the battery cables. You can also test to see if the voltage is going thru to the starter motor, if not then cross jump the solenoid and start the car.
Remove a spark plug wire from spark plug and use an insulation handled screwdriver to ground the metal fitting inside the spark plug boot to the engine, and have someone turn the engine over while you watch for a spark. You should have the metal screwdriver shaft about an eighth of an inch from a clean metal surface on the engine, and be careful not to touch any un-insulated parts of the tool while testing the plug. If it is not spark, you have an ignition circuit problem. In addition to above, some related points to check are as under:-
1. The stall is likely caused by either a problem in the electrical system or in the fuel system. The engine stops running because it is not igniting gas in the cylinders, this occurs either because there isn't gas to ignite or because it lacks the electrical charge to ignite it.
2. Drive the car up and down steep hills. Does this change the performance of the engine, or cause it to stall? This might indicate a clogged fuel filter.
3. Does the car idle roughly and stall when at idle? If your car has a distributor, you may need to adjust the timing. With the right tools and know how, this is an easy and free task. If your vehicle has fuel injection, you can check the injector by using a screw driver or mechanics scope. The injectors will make a clicking/snapping sound if working. No sound would indicate a bad injector available at most DIY auto parts stores. Also check the ICM, idle control motor that controls the air mixture.
4. If your car has a distributor, you might consider changing the cap, rotor, wires and plugs. This is effectively a tune up. This can usually be done even by a relative novice to car repair, and take a couple of hours with the right tools. It seems counterintuitive, but the wires and distributor decay over time, and transmit less electricity. This tune up may solve the stalling problem -- even if not, your car should run better and get better mileage.
5. If your car diesels when you turn off the ignition, it often signals the need to replace the spark plugs. Dieseling describes the situation where you turn off the key, yet the car continues to run for a few seconds or longer, eventually sputtering to a stop.
Please do accept the solution if the issue is resolved or post a comment for further assistance.


Thanks
Rylee

Posted on May 06, 2010

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