Question about 2003 Buick Rendezvous

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P0303 misfire misfire an shakeing an I put new plug an wire an same misfire

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  • 33 Answers

Unplug the #3 plug wire from the coil, have someone crank or start so you can check for proper spark from #3 coil tower (a test light attached to ground works well, get close to tower and spark should jump to test light) be careful don't get shocked. should jump a gap 3/4 inch and be blueish. If good spark possible faulty injector or burnt valve

Posted on May 11, 2014

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Posted on Jan 02, 2017

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SOURCE: have a2003 buick rendezvous 3400

you might not be getting a injector pulse signal at # 3 cylinder ? easy way to check this is with a noid light, it plugs in to the end of the connector and as crank the engine the light should flash. if it does not flash check wire harness for a open circuit from injector to computer ( e.c.m.) if thats alright possibly e.c.m. bad . if you cant find noid light you can use a digital volt meter. good luck

Posted on Feb 19, 2011

Wolfman304
  • 720 Answers

SOURCE: my 96 roadmaster has a

Hi,

Your vehicle's engine emission system is monitored by the On-board Diagnostic (OBD) computer.

Misfires can be caused by any number of circuits ranging from MAP, TPS, HO2, Injectors, Vaccuum leaks....and so on.....and so on.....

The misfire you speak of will have triggered the appropriate fault codes which will be stored in memory. As there could be numerous causes for this condition, you really should have your codes read by your local dealership.

Checking for fault codes only takes 15-25mins (depending on experience of the technician), and will quickly identify the suspected circuit/s.


Good luck...



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Error Code: P0303
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Vehicle missing,shaking,engine light comes on


Misfire could be a number of things:
a) spark plugs - change them if used over 15K miles - inspect/regap.
b) spark plug wires - change them if over 15K miles - inspect
c) ECM (electronic control module) - test with HEI (high energy ignition) tester.

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)
not firing at all.

The "Check Engine" light probably is coming on due the the misfire condition. Go to Pep Boys or
Advance Auto Pats, where they'll tell you (free) your codes causing the "Check Engine' light to be
lit - the code coming from your truck's computer will probably be one or more of:
P0300 - Random/Multiple Cylinder misfire detected
P0301 - Cylinder 1 misfire detected
P0302 - Cylinder 2 misfire detected
P0303 - Cylinder 3 misfire detected
P0304 - Cylinder 4 misfire detected
P0305 - Cylinder 5 misfire detected
P0306 - Cylinder 6 misfire detected
P0307 - Cylinder 7 misfire detected
P0308 - Cylinder 8 misfire detected
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Code 303 and 304 and check engine light plugs have not been changed 119.000 miles is it tune up time


P0303....Cylinder 3 Misfire Detected

P0304....Cylinder 4 Misfire Detected

sounds like a new set of HT leads and plugs wouldnt go amiss(fire wires) weird name that fire wires HT stands for high tension leads in proper english .

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2006 pontiac grand prix recevied code P0303, changed spark plugs, wires, and fuel injector. Car still shakes and check enigine light is still on. Acceleration is fine.


Spark plugs,wires and injectors, have nothing to do with your problem

PO303 is a misfire on cylinder #3
You may have an individual cylinder coil for that cyl or a coil pack for
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You may also have other issues that are causing the shaking

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are you getting fuel and spark at every cylinder?? Were the new plugs gapped??

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This could be a coil problem but i would start by changeing the plug wires and checking each plug.

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