Question about 2002 Buick Century

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My car jerks/ hiccups when I accelerate, and the engine shakes when I turn it on.

My check engine light is on for cylinder 1 misfiring. Just replaced my heater core because I wasn't getting heat and now I am starting to get a burning smell from the engine.

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  • Expert
  • 79 Answers

Timing belt jumped a tooth?,causing burning smell from engine overheating?????????. Out of ignition timing causes erratic/missing/jerking and possibly die. All this " may be " a coincidence from heater core repair.

Posted on Jan 01, 2014

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

cadman000
  • 607 Answers

SOURCE: my car is jerking while accelerating and reaching certain RPM

I would look for a fault in the ignition system such as a cracked spark plug. Might need a scope check to put your finger on the problem

Posted on Apr 06, 2009

fastboyz
  • 674 Answers

SOURCE: 99 buick Lesabre

hey thanks for bringing me up to speed. ive been working on many other problems but with your great explanation i remember.
we need to check the compression on that cyl. and compare it to the compression on 2 other cylinders your choice.
but before you do this get a can of carb cleaner . and with the car idling spray around the intake manifold in the area of #6 cyl. what we are looking for is a small vacuum leak that would also act like this. with the engine idling and spraying around the intake the engines idle sould not change and if it does when you spray you have an intake leaking.
let me know how it turns out.
later
paul

Posted on Sep 23, 2008

SOURCE: heater core replacement

OK, Ifound the problem with mine. Dont unplug your air dryer. I checked the 2 hoses coming out from the heater core and still one was hot and the other not hot. The top one comes from the radiator fill tank and the bottom one comes out of the core and goes around to the front and into the water pump. I disconnected both close to the core and could runwater through both directions so upon further examination, I disconnected the hose at the water pump and no water flow. The hose was plugged up with something. Once I cleared it with a hanger and reconnected it I had water flowing through the core and great heat. Hope this is your problem too as it is aneasy fix

Posted on Oct 23, 2008

blubanshee
  • 48 Answers

SOURCE: heater core replacement

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You have to remove the entire front of the heater case to change thecore. This usually looks a lot easier in print than it actually IS.Theinstructions say to remove the lower part of the dash for access; usually youdon't have to remove the entire dash for this type of service, althoughsometimes it makes things easier if you loosen and remove any components notmentioned in the procedure that are in your way.
This kind of repair can be frustrating, as it involves working in tightplaces and with 1/4 drive extensions and universal sockets to get all thefasteners out, but it IS possible.Here is what I have for the factoryprocedure. I don't know of any shortcuts to make the process easier; if you can'tget it off, perhaps removing the dash completely for more room would be aviable option...


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Posted on May 27, 2009

matney68
  • 426 Answers

SOURCE: 98 buick lesabre 3.8, engine misfires. coil for #1& #4

coil packs go out but before replaceing just look under the wire where it hooks up and see if it is rusty or corroded.sometimes just one side goes out which I find kind of odd but it does happen,

Posted on Nov 10, 2009

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Engine sputters and hiccups when driving


Sounds like you have a cylinder misfire. Is check engine light on ?, Have you had the vehicle somewhere to get a code scan? My assumption is that you have an ignition problem that is causing the rough idle and jerk feeling while driving.
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Misfire could be a number of things:
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The shaking tells me that the engine is running on less than its normal compliment of cylinders - the shaking is produced by the imbalance caused in the engine by one (or more) cylinder(s)
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The "Check Engine" light probably is coming on due the the misfire condition. Go to Pep Boys or
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P0302 - Cylinder 2 misfire detected
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P0304 - Cylinder 4 misfire detected
P0305 - Cylinder 5 misfire detected
P0306 - Cylinder 6 misfire detected
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When the light is blinking it means the car is actively misfiring (which is why it's shaking and running rough). When this happens, pull over immediately and shut the car off. Running with a misfire can damage the engine.

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