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vt loses power under acceleration, shudders/struggles to pick up speed...

CV6Z

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in the last week ive been having some drama's with my car its a VT V6 auto, im not sure whats going on but it seems to struggle under acceleration...very noticeable when going uphill put my foot down to give it some and its as though it has wet spark plugs - shudders as it picks up speed...but when coasting along its fine!!!! its only when you give it some that it shudders...

im thinking it could be the fuel pump playing up? as in not being able to pump enough fuel through when you accelerate up to speed???

though when i was coasting along i put it in neutral and gave it a few revs and it doesnt happen...its only when its in drive. could this be a sign that the gearbox could be the fault?

or should i be replacing spark plugs and leads? coil pack?


im stumped, so any help is heaps appreciated

cheers
 

Tree cutter

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Sounds like plug leads to me. Very common problem
 

CV6Z

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plug leads hey. will look into getting new leads this week n see if it still has this shudder problem....i hope its only plug leads..
 

Finnrizell

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Mate my vt is doin the exact same thing please tell me u figured it out???
 

graham7773

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My VT was doing the same thing and I just noticed that this thread is 4 months old. Have you fixed the problem yet?
 

Finnrizell

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Grahem mate mine is doin the same thing do u kno tha problem is?I've changed the Fuel filter the plugs leads coil packs and module MAF and it is still shuddering??
 

slowandlow

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check the injector o-rings are ok. maybee air is sucking in through the bases.
 

Finnrizell

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Tha fuel injectors ay?? Have u fixed it's mate?
 

Brett_jjj

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Id say it would be the plugs,leads or if they are ok,one of the 3 ignition coils.These coils can run fine with no misfire or spluttering until they get put under load (going uphill or when accelerating fairly hard) then they can break down and cause the misfiring or spluttering.You can test the 3 coils with a multimeter,but Ive seen them show to be ok,but still cause misfiring. I keep a spare new coil just for testing purposes,just get the good coil,and swap it with the 3 coils ,one at a time, and drive it each time,if the problem goes away,then that coil that was removed is the problem.Its best to replace all 3 coils at the same time.Ive found fitting 3 new coils makes a big difference to the starting ,running ,and fuel economy,even when the coils are not faulty and are just old.They must slowly loose their performance over time until they get to a point where they die and cause mifiring.
 

Finnrizell

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I've already swapped the whole coil packs and module wit 1 frm a VS I ave sittin ere it still doin it ay I dnt get it I'm thinkin fuel blockage ay would that course misfiring under pressure like it is ay
 
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