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#212492 - 01/16/11 09:19 AM 04 GP Knocking
kmaggart Offline
Junior Member
Registered: 01/16/11
Posts: 1
Our 04 GP recently started knocking so we switched to premium fuel. That solved the problem for a while but now it's missing, hesitating, so on like a madman. No engine codes, just terrible mileage and running.

It's been a great car but now has 150k+ on it and this has started.

Going to do the standard tuneup but wondering if anyone else has seen this happen and what you did to correct.
#212532 - 01/19/11 12:30 AM Re: 04 GP Knocking [Re: kmaggart]
72chevman Offline
Registered: 09/27/07
Posts: 1575
Loc: Where Dorthy,Toto & Wicked Wit...
Does it have original plugs & wires? If so WOW! Get ACDelco wires from and any quality (autolite, ACDelco, NGK) double platinum or iridium plugs. PVC & fuel filter would be a good idea too. As far as fuel, find a station that sells "Top Tier" fuel and use that if you can. I'm very surprised you can hear the knocking.
03 GT, STB, GM HD sway bars, 35% tint, GE893(37watt)fogs, Flowtech Terminators, 180 T-stat, ZZP DP & PCM, Ceramic PLOG & Crossover, 18" glasspack, 2007 17" Mustang Bullits 235/55/17 Pirelli PZero Nero, 12" R1 D\S rotors, gutted air box, GTP radiator