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#1
08-03-2010, 09:22 PM
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91 Mercury Grand Marquis Bucking Issue
Ok here we go. Recently did valve cover gaskets obviously removed the upper plenum to get to the passengerside valve cover. Re-installed did Spark Plug Wires and Plugs. Started car up idles great! Going down the road at 20-25% open throttle vehicle bucks on accel. Re-Checked firing order and sparkplugs everything good there. I will add that I did clean the IAC valve with carb cleaner dont know if that would make a difference. Driveside valve cover was leaking oil dont know if MAF sensor may have sucked in some oil or what. Do you guys think an IAC will cause this problem if its not FUEL or SPARK? Checked vaccums and intake for leaks no leaks found. Any help would be great!
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 The Best Auto Repair Service in Central FLvisit http://www.AutomotiveServiceWorks.com 
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#2
08-03-2010, 11:31 PM
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Re: 91 Mercury Grand Marquis Bucking Issue
Check the EGR/DPFE system. If EGR valve is not opening, restricted, or stuck open, it will cause a bucking sensation at light throttle.
__________________
 2000 Mercury Grand Marquis LS - 119k / 14.89s @ 92.11MPH [ pictures | videos ] > Dual Flowmaster Delta 40s / J-Mod / PI Intake Manifold & Cams / Marauder Air Box & 80mm MAF / 3.55 Trac-Lok > Bumper Tuck / Steeda UD Pulleys / CVPI Zip Tube / Ported & Polished Plenum / BBK 70mm TB > BOC 93 Octane Tune / Headlight Relay Upgrade / 17mm rear stabilizer bar / Heinous Aluminum Billet Rear Control Arms > CVPI aluminum driveshaft
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