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Question

car is jerking and making poping sound when I start driving or depress the gas pedal with any force but once rolling it stops jerking.

Submitted: 90 days and 4 hours ago.
Category: Car
Value: $23
Status: CLOSED
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Optional Information

Year: 1998
Make: Lincoln
Make (other): Continental
Engine: v8

Already Tried:
don't drive.   The transmission is three years old.     

Posted by Ed 90 days and 2 hours ago.

Answer

Hello. From your description it sounds like there is an ignition misfire due to either a defective spark plug or ignition coil. Under a hard load a misfire is more likely to occur, and tend to go away under cruise conditions. If you can get the car to a shop that can scan for diagnostic codes, there will likely be a diagnostic code set that will indicate which cylinder is misfiring.

90 days and 1 hours ago.

Reply

okay and the poping sound is part of the same thing? Generally how much can I expect this to cost when I go to the shop in the morning?

Accepted Answer

The popping is probably related to a misfire. It is also possible that there is a lean backfire occurring due to a vacuum leak, but my experience is that on a Continental there is usually a defective ignition coil. If I am correct about the ignition coil, I estimate roughly 250.00 based on $100 for a coil and plug, and 1.5 hours labor.

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Expert: Ed
Pos. Feedback: 100.0 %
Accepts: 
Answered: 8/25/2009

Technician

10+ years servicing Ford, Hyundai, and other brands. State Inspection Mechanic.

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