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LT1 Camaro Spark Plugs / Plug Wires / Misfire Questions. PLEASE HELP! Posted By: QUICKB4C On: 06-14-2009 @ 22:29:01 Reply | Edit Hey everyone. I need some help regarding some questions with my car. The car is a 1997 Camaro Z28 with 70,000 miles. I'm a newbie to this sight but everyone recommended it. The guys in my car club said there are some good folks on here so I'm hoping they're right. I have not had any problems with the car and the car was running great. Now, at 70,000 miles I decided to do a plug change because I'm not sure when the last time was that they were done since I'm not the original owner of the car. I've done all the mods but the plugs looked original OEM. I bought a set of Bosche 2 Platinum plugs and replaced all the plugs. I took it out for a test drive and had a slight stumble loss of power at low RPM from starting rest to about 65 or 70 MPH. After that speed, it seems to "catch" and run and feel like it's running normal without a hitch. MINOR MINOR rough idle as well. Then it eventually threw some codes. I hooked my scanner up to it and scanned the ECS. I got a P0151, a P0300, and a P0305. For those of you experienced in the OBDII you know that's an O2, a random misfire, and a cylinder 5 misfire. I dismissed the O2 and cleared it because i used a lot of PB blaster on the exhaust and it was bank 2 sensor 2 which is post cat so I didn't see it causing much of problem. I came back home and pulled the number 5 plug, inspected it and RE checked all the plug wires as I checked them all when I did the plug change. I then read on several of these forums, where many people advised against using Bosche and the platinum plugs so then I went to the Chevy dealer and bought some direct AC Delco replacement plugs matching part number and everything from what came out of the engine. I put the Delco plugs in and went out for another test drive. It didn't stumble or misfire or lose power AS BAD but it did the exact same thing. I'm not sure what if anything a simple spark plug change could screw up to cause a misfire when everything was fine before. My only idea is that I might have broken a filament inside a wire moving the wires out of the way to pull the plugs out when I did the plug change. The wires LOOK great but as far as their resistance qualities and internal shape I'm not sure. They APPEAR to be the original OEM wires that came on the car new so I'm not sure they have ever been changed out. If not, then they are probably very brittle from the heat and I don't think it would take much movement to mess them up. I have already ordered a new set of AC Delco wires from the dealer and they will be in on Monday so I will put them on then. My questions are as follows: has anyone had similar issues after something as simple as a spark plug change? If you have or even if you haven't, does anyone have any advice about what could have caused it or what i should do? My oil dip stick has broken the little plastic piece up by the handle so I removed it to keep the piece from traveling down into the oil sump. I don't think this could happen but a friend of mine suggested maybe the problem is from doing the test driving without the oil dipstick in place because the system is not sealed anymore. Does anyone else think this is possible? I dismissed it but I guess anything is possible. And the other questions are more or less brand / type / preference questions. Does anyone have any recommendations or preferences about which spark plugs are the best for this year LT1? And does anyone have any recommendations or preferences about which spark plug wires are the best for this year LT1? Also, I heard so many horror stories bout the spark plug changing on an LT1 and I have to say the first time, I did agree it was a doosy, but now I've got it down to where i can change all 8 in 45 minutes. Does anyone have any suggestions or ideas or links to writeups on how to do an LT1 spark plug wire change? Help on this would be greatly appreciated! And lastly and again I'm repeating, does anyone have any idea what causes this or has it happened to you. Lots of LS1 experiences on the net, not a whole lot of LT1 experience. Please write back. :bang: -- 1997 Chevy Camaro B4C ... 469.9 HP naturally aspirated  evil:, SLP interceptor tune, 58 mm TB, Hypertech 160, K&N cold air, ZZ9 camshaft, Comp Cams chromoly p’rods, Comp Cams lifters, Roll Master dual roller timing chain, Spec State 5 billet steel flywheel, Denso O2 sensors, TPIS / air flow cylinder head for LT1, Borla cat, SLP pulley, Diamond custom forged pistons, Diamond Pro select rings, Lucas 42# fuel injectors, Moser 3.73:1 gears, Baer Eradispeed rotors, Hawk ceramic pads, lights, siren.Posted By: Calaban007 On: 06-14-2009 @ 23:20:28 Reply | Top | Edit What all have you changed so far? -- 
1995 Camaro Z28, M6, T-Top Conversion, CAI, SFC's & 1989 IROC-Z restoration in progress Posted By: QUICKB4C On: 06-14-2009 @ 23:47:37 Reply | Top | Edit only plugs. I put the Delco's back in after it happened the first time. It's still doing it. I ordered some new wires. They get here tomarrow so I'll probably put them in tomarrow =] -- 1997 Chevy Camaro B4C ... 469.9 HP naturally aspirated evil:, SLP interceptor tune, 58 mm TB, Hypertech 160, K&N cold air, ZZ9 camshaft, Comp Cams chromoly p’rods, Comp Cams lifters, Roll Master dual roller timing chain, Spec State 5 billet steel flywheel, Denso O2 sensors, TPIS / air flow cylinder head for LT1, Borla cat, SLP pulley, Diamond custom forged pistons, Diamond Pro select rings, Lucas 42# fuel injectors, Moser 3.73:1 gears, Baer Eradispeed rotors, Hawk ceramic pads, lights, siren.Posted By: Green97TAMachine On: 06-15-2009 @ 05:13:01 Reply | Top | Edit It's most likely just the wires. As they are the build resistance and get briddle, so whe you change plugs (like you said) you can break the wires inside the insulation. As far as plugs, there are 2 that most will reccomend you. Plain old Delco Platinum's OR NGK TR5/TR6's. I've used the NGK plugs in my old 91 RS (305) and my 97 TA and I've NEVER had any problems with them. I also put them in my DD (91 accord) and my girls car (99 accord v6). The NGK TR5's are also the cheapest/best band for the buck at $1.79 a piece. -- 
1997 Mystic Teal Trans Am Best Time: 13.984@102.99Mph  Posted By: Calaban007 On: 06-15-2009 @ 07:11:53 Reply | Top | Edit Yeh, I never change plugs without changing wires. Especially on an LT1 since it's a PITA anyway. I run NGK plugs and Jeg's branded wires on my Z28 and my IROC. $40 bucks shipped for a set of 7.5mm or larger wires is a great deal. I think Summit has their own wires now as well. Probably manufactured by a name brand company and just printed with Jeg's or Summit. Good Luck --
1995 Camaro Z28, M6, T-Top Conversion, CAI, SFC's & 1989 IROC-Z restoration in progress Posted By: dragonz28 On: 06-15-2009 @ 11:34:02 Reply | Top | Edit I've used Taylor wires and they lasted less than a year. I've used MSD wires with same results. So being the cheapass that I am, I went to Autozone and bought lifetime replacement wires for under $40 and just change the wires whenever they let go. I've probably replaced the lifetimes at least 3 times in the last 4yrs. I also run only NGK TR55s plugs which I got some the other day for 1.99 from O'riellys. I replace them bout once a year since they're so cheap. Also if you replace the 02 sensors, stay away from BOSCH! -- 94Z 12.993@102.11 1.72 60' Vig3200, 3.73s, PS Longtubes TDs, H-pipe, bullets dumped and a Madztune. 
Posted By: 95ttoplt1 On: 06-15-2009 @ 13:49:35 Reply | Top | Edit NGK's here as well. I have taylor wires with no problems so far. I had problems with the number 5 plug getting loose every now and then. Your problem is more than likely wires. They are a major pain to replace if you have the stock manifolds on as well. The dipstick is not the problem. --  Posted By: jjdynomite 
On:
06-15-2009 @ 14:23:43 Reply | Top | Edit
semi bandwagoner here. lol ngk plugs and whatever wires are on sale that time of year. -- lsxltx.com
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