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Re: COIL pack / Engine shudder at High RPM questions?? Posted by SWEDECAR [Email] (#112) [Profile/Gallery] (more from SWEDECAR) on Sat, 24 Aug 2019 09:21:10 In Reply to: COIL pack / Engine shudder at High RPM questions??, Chris Cunningham, Sat, 24 Aug 2019 07:29:36 Members do not see ads below this line. - Help Keep This Site Online - Signup |
First make sure the engine have correct spark plugs. NGK PFR6D-10G.
A customer of mine picked up a pristine 9-3 in Texas that had been serviced just before, and they had installed the V6 spark plugs instead of the 4 cyl. Along the way, those taller spark plugs burned a hole in a piston and he needed a new engine.
Worn inner drive shaft joints can also create a shudder during acceleration.
A failing fuel pump can deliver too little of fuel during hard accelerations and create misfires. This is more common on the V6 though.
Anders
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