JTSLP559

iTrader: (3)

ok so my 01 z28 didnt pass smog.. NO and HC were way high, so i figured maybe a tune up would help? it has 143.xxx miles on it, plug wires look original havnt took the plugs out yet though, what plugs should i run? ngk v powers? my car has pops or backfires when its cold and i take off for the first time. so hopefully this may take care of my issue.. any input would be greatly appreciated.

JTSLP559

iTrader: (3)

ok got the msds and ngk v power tr55s in. all of the plug wires on the passenger side came apart when i tried pulling the boot off of the plug, a couple on the driver side aswell, the plugs were whiteish with a hint of brown, not sure what that means.. i had alil race gas in there so the brown is probly that? the plugs didnt look too bad.. no black or nasty build up.do you think this might take care of my smog problem? gap is at .60

Petraszewsky

iTrader: (28)

Here you go:

http://www.classictruckshop.com/club...park/plugs.htm

JTSLP559

iTrader: (3)

hmmm i forgot to mention. it has the stock ac delcos in it, the diod or whatever you call it wasnt flat like pictured.. it was sharp and pointy.. like a mountain top.. is that normal? i dont remember ever seeing a plug like that..

Petraszewsky

iTrader: (28)

Yeah the A/C Delcos are pointy like that....What's you're diagnosis of the plugs? Was it lots of brown or do they fall under normal wear and tear?

black01_WS6

iTrader: (13)

also seafoam your car before you change the spark plugs- if you don't know what it is search should come up with a lot of threads.

Make sure you do this before you change the spark plugs. Also you can change out the fuel filter at the same time- its like 13 bucks or something and will help- change that out after seafoam as well.

You also may want to get your o2's read- if they are original they proabably need changed.

JTSLP559

iTrader: (3)

fuel filter was changed 100 miles ago, the plugs looked like they had ash lead deposit. which makes sense i had 5 gallons of 118 leaded in it.. however it failed smog horribly, my NO and HC were way high, like stated majority of the plug wires came apart when takeing out. il get a pic of the plugs.. but not bad IMO, still pops when cold when i hit the throttle or take off..

black01_WS6

iTrader: (13)

I would be checking your o2's. especially after running 118 leaded race gas thru it.

Why would you run that gas?

onebadazzls1ta

Leaded gas screws the 02's time to get some new ones, NOTE TO SELF dont run leaded gas in unleaded cars LOL. If I where to run race gas the max I'd put in was 110 unleaded.

puggerton03

iTrader: (1)

correct me if im wrong but the popping when letting off when the cars cold is from the air pump system. that is normal.

JTSLP559

iTrader: (3)

i was inside.. my drunk *** friend dumped it in my tank when i wasnt looking, i ran it in my yfz 450, if my 02s were bad wouldnt i throw a code?

JTSLP559

iTrader: (3)

ok took the car down with the new msd wires and ngk's, my NO was down to passing but barly, everything was better, however the my HC was at 37 and maxium allowed was 35, this was at the 25mph test.. any suggestions? chaning my oil maybe help?