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  #1  
Old 07-16-2008, 05:23 PM
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Default Bucking/Jerking on hard acceleration?

I have no check engine light on and no codes coming up. The mechanic replaced the ignition control module. It is still happening. Can it be the coil packs or random misfire without an error code? Any othe ideas? 1997 a4 1.8t
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  #2  
Old 07-16-2008, 07:56 PM
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Default RE: Bucking/Jerking on hard acceleration?

no... if it was misfiring it has to throw a code... its afederal standard and required by law.

has your battery gone dead since this has been happening...?
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Old 07-16-2008, 08:04 PM
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Default RE: Bucking/Jerking on hard acceleration?

No dead battery.. I just went out and looked around... The tubes connected to the air filter housing are sputtering.. drivers side fan on...passengerside fan is off. My temp gauge never moved above quarter way but now gauge is at half except when I went on highway
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Old 07-16-2008, 08:52 PM
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Default RE: Bucking/Jerking on hard acceleration?

hi guys my car is doing the same after just spending $2200 at a dealership....jerking under acceleration, but no codes thrown. Could this be bad plugs?, Just had one coil pack replaced and the others appear to be fine
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  #5  
Old 07-16-2008, 08:56 PM
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Default RE: Bucking/Jerking on hard acceleration?

what do you mean by sputtering...?
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Old 07-16-2008, 08:57 PM
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Default RE: Bucking/Jerking on hard acceleration?

cause a vacuum leak will give the same symptoms as misfire
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Old 07-16-2008, 08:58 PM
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Default RE: Bucking/Jerking on hard acceleration?

My mechanic said not plugs or coils without engine light and error code. His online troubleshoot program led him to ignition control module (ecu). That didnt work. He said he also checked for vac leaks?
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  #8  
Old 07-16-2008, 09:00 PM
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Default RE: Bucking/Jerking on hard acceleration?

>>sputtering meaning if u feel the tube coming in and the two after the split they are pulsating
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  #9  
Old 07-16-2008, 09:03 PM
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Default RE: Bucking/Jerking on hard acceleration?

is there a whooshing or sucking sound...? 1.8T i notorious for vacuum leaks...

post your VIN number so i know exactly what generation of 18.T i'm dealing w/...
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Old 07-16-2008, 09:05 PM
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Default RE: Bucking/Jerking on hard acceleration?

Sometimes a whale like noise
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  #11  
Old 07-16-2008, 09:11 PM
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Default RE: Bucking/Jerking on hard acceleration?

How can I find a vac leak?
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  #12  
Old 07-17-2008, 11:08 PM
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Default RE: Bucking/Jerking on hard acceleration?

Did you try cleaning your throttle body? Thats an inexpensive easy thing to do to start with.
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Old 07-17-2008, 11:08 PM
 
 
 
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2008, acceleration, audi, boost, bucking, car, charger, hard, highway, jerking, leak, leake, misfire, sputtering, vacuum


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