LS1UltraZ

iTrader: (3)

Ok just got the FLPs in... however getting P0300 trouble code for an engine misfire on ATAP. It says 7 missifires per cylinder? Is there a plug wire not on??? Is that what will cause that code? I am currently checking all the wires but they seem to be on as well as they can. HELP! Thanks Guys.. off to the the car again.
Sean

LS1UltraZ

iTrader: (3)

??? TTT ??? <img src="gr_eek2.gif" border="0">

Sean

BadMonkey

iTrader: (1)

I had the same problem as well, among other things, anyway it turned out to be a loss wire. Recheck all you wires and then check again that is more or less your problem. If it was anything else you would have more codes. Good luck

[ December 11, 2001: Message edited by: bd mnky ]</p>

LS1UltraZ

iTrader: (3)

Ok so it should be the wires/plugs and not the o2 sensors correct? I have checked and rechecked the wires/plugs and even switched wires around yet i still get misfires on cylinders 2 and 7. 2 still hangs around 30 and 7 gets as high as 2000 at times. CAR SEEMS SLUGGISH, low on power-- yaknow like im running off 7 cylinders. Also has a rough idle like a mild cam. SES light still flashes after flashing the PCM and driving around for a relearn. THIS SUCKS! Any more ideas!?!?! <img src="graemlins/gr_guns.gif" border="0" alt="[guns]" />

Sean

99WhiteSS

Maybe check the coil packs on those cylinders...contact "Valvegod" (find his posts in the Classified section) on LS1.com, he can get you individual coil packs for a low $22/each.

-Kris

LS1UltraZ

iTrader: (3)

Ok thanks man.. im gonna go switch two coil packs and see if it changes the cylinder missfire.. then i will tell be able to tell if i need two new onees i guess. Thanks for the info.

Sean

LS1UltraZ

iTrader: (3)

Just switched a coil pack from a non missing cylinder to the missing #2 cylinder, and it still showed up on number two. So since i have switched wires and coils around... hmmm it would HAVE to be the PLUG i suppose. There are no other variables i dont think that would cause a misfire trouble code. Damn it i didnt want to do the plugs <img src="graemlins/gr_punch.gif" border="0" alt="[fight]" />
Sean

BadMonkey

iTrader: (1)

When I installed my slp's I had the same problem. If it was your O2 you would get a code for either low resistance (i had this do to a splice) and a lean condition. I replaced and respliced my O2 harness and got rid of the other two codes, and then checked my plug wires to find one of them to my coil pack not seated properly. Maybe it could be a plug or maybe you damaged a coil wire when removing them, they are a bitch to get off. Try swapping coil wires as well as inspecting the plugs. While you check the wires reset the PCM as well. Hope this helps. I am no expert but thats seem to be the problem when I installed mine.

ShooterSS

iTrader: (3)

I got the exact same error code after my Vig3200 install. Seems like Cylinder 2 also. P0300 was the SES I was throwing but it was a solid SES. I've already got new MSD wires and NGK TR55 plugs so HOPEFULLY that takes care of the problem. If not, coil packs next. <img src="gr_stretch.gif" border="0">

What should I gap the NGKs at? Anyone?

Thanx. <img src="gr_stretch.gif" border="0">

LS1UltraZ

iTrader: (3)

Hmmm thats weird that u got it after your converter install.. i just had a my ST3500 put in but no codes were thrown for 2-3 days. Then i did the header install.. and BLAH the misfires have shown up and and the car seems very low on power. Switching plugs as we speak, even though they look fine. So if its not coils, wires, plugs... what the hell would it be???? What would cause a misfire? I know it means there is a lean condition.. too much gas not enough o2. I dont know what to do here.

Sean <img src="graemlins/gr_cry.gif" border="0" alt="[whiner]" />

cdm98z28

There has to be a bad connection somewhere. Plugs and wires and even coils rarely ever go bad just from installing something. The car wasn't running, so its unlikely one of those items would just suddenly go bad. I would take a look at the plug wire/coil pack connections. If you have stock wires they click TWICE when pushed into the coil. Try checking the harness for all of the coil packs. For that matter check everything that had to be reconnected after the headers were in. Good luck.

LS1UltraZ

iTrader: (3)

Ok i switched plugs from cylinder 1 and 2 to see if it was the plug in #2 causing a misfire. Well #2 still misfired, and now number 1 is acting up WTF <img src="gr_images/icons/mad.gif" border="0"> I will check to make sure i get 2 clicks and make sure the coil packs get securely clicked in.. but i have already done that.. Looks like im screwed by an invisible problem and now my car is slow <img src="gr_sad.gif" border="0">

Sean

cdm98z28

Keep your head up, you'll find it eventually. Like I said, check all connections, including the O2 sensors. I think there is an extender harness on those, so take a look from underneath the car.

cantdrv65

iTrader: (3)

Remeber, the Big 3. Fuel, Spark, Compression.

LS1UltraZ

iTrader: (3)

Ok i have checked absolutely everything, switched wires, coils, plugs, 02 sensors, all harnesses.. everything is fine. I think my PCM must have gone kaboom, since it just wont read off of those cylinders.. especially #2. I even took the spark plug wire completely off of cylinder #2 and it gave the same amount of misfires, aproxmiately 3K. So it just isnt reading it at all i suppose. I think ill be taking my chances at the dealer and see what they can do under warranty.

Sean <img src="gr_sad.gif" border="0"> <img src="gr_sad.gif" border="0"> <img src="gr_sad.gif" border="0">

BLUZBUNNY

What do I know, I'm just a chic, but.... My 2002 Z28 has been at the dealer for 2 days, and had the techs calling Chevy for answers. They wouldn't tell me much. The SES light went on, and over 2000RPM's I was getting a flashing SES. The car was running very rough, and was miss-firing on least one of the cylinders. At one point, there was lots of white smoke coming out of my exhaust, and the car died while I was in bumper to bumper traffic. I think the mechanic was as puzzled as you seem to be. They were getting all kinds of codes, too. All they could come up with, was the possibility that I had gotten a bad batch of gas. Don't laugh. They asked if I had gone to a Speedway for my gas recently. No way. I must have gotten it from a Shell the other night. They ended up running all the gas out of my car, flushing the tank, and cleaning the injectors. They still weren't sure if that would do it. It's running fine now. Another thing. I asked them to put Mobil One in when they changed the oil, and said that unless the specs called for it, they would have to charge me the difference. I said go ahead. They gave me regular oil anyway. The Service rep also argued with me, and said that I should be putting 87 octane in my tank. I told him that I would use nothing less the 93, and that it's in the manual for Z28's. It just goes to show you that we know more about our cars than most of the salesmen, and service guys do. Jody <img src="gr_stretch.gif" border="0"> <img src="graemlins/burnout.gif" border="0" alt="[Burnout]" />

[ December 12, 2001: Message edited by: BLUZBUNNY ]</p>

BadMonkey

iTrader: (1)

Check all your wires to the coil pack, maybe one of them was possibly pulled when you disconnected it, look in the plug as well maybe a pin is pushed back, it sounds more like a wire problem. Absolutely make sure everything is in its place the dealer will charge you. <img src="gr_eek2.gif" border="0">

[ December 12, 2001: Message edited by: bd mnky ]</p>

BYBYC5

not to be the bearer of bad news but i had the same problem with #5 and now after giving up and ignoring it i now have a hole on #5 piston (pics to follow soon) ps is recently used the bottle, but the unknown misfire use there prior to that so becarfull and dont abuse it till u absolutly fix it <img src="graemlins/gr_guns.gif" border="0" alt="[guns]" />

BYBYC5

not to be the bearer of bad news but i had the same problem with #5 and now after giving up and ignoring it i now have a hole on #5 piston (pics to follow soon) ps is recently used the bottle, but the unknown misfire use there prior to that so becarfull and dont abuse it till u absolutly fix it <img src="graemlins/gr_guns.gif" border="0" alt="[guns]" />

BYBYC5

not to be the bearer of bad news but i had the same problem with #5 and now after giving up and ignoring it i now have a hole on #5 piston (pics to follow soon) ps is recently used the bottle, but the unknown misfire was there prior to that so becarfull and dont abuse it till u absolutly fix it <img src="graemlins/gr_guns.gif" border="0" alt="[guns]" />