spark plugs for a full top end ported engine - ZR-1 Net Registry Forums

phrogs · 08-09-2009

What are some of you using in your ported top end cars.

Mine has thottle body, heads, injector housings and plenum ported

I have the AC FR2LS plugs gaped at .35 in the car and I have a high idle and the car is running rough low on power one day I was driving and the car just felt wired It felt like I lost a cylinder very rough even at 65 in 6th gear the car is strugling shaking like a leaf in order to do 65 I have to be in 5th gear otherwise the car starts to shake itself to death.

I have newer accel injectors about 4,000 miles on them
older LT5 wires probably 25-30K miles on them and ac delco coils no idea the mileage its an old set I had on the self to replaced cracked screamon deamon coils that were on the car.
car has the chip DRM burned for it after the porting work they did.

Now tonight I pulled the plugs and looked at them all but one spark plug looked ok #6 was black the rest looked normal but I am running very rich black soot on my exhaust pipes I know im running rich.

so I swaped out #6 with another plug to see if it looks different tomorrow after I drive it to work and back home just to make sure that plug is working.

I drove it tonight removing every wire trying to locate a dead cylinder and everyone of them gets worse than it has been with them all pluged in so it seems all my cylinders are firing.

what you guys think?
do I need a hotter plug perhaps?
Im willing to try the cheap aproach first.

im going to keep messing with it but looking for ideas.

perhaps new plugs wires and coils and go from there?

08-09-2009	#1
phrogs Join Date: Jul 2004 Location: Kalamazoo MI Posts: 1,752	spark plugs for a full top end ported engine What are some of you using in your ported top end cars. Mine has thottle body, heads, injector housings and plenum ported I have the AC FR2LS plugs gaped at .35 in the car and I have a high idle and the car is running rough low on power one day I was driving and the car just felt wired It felt like I lost a cylinder very rough even at 65 in 6th gear the car is strugling shaking like a leaf in order to do 65 I have to be in 5th gear otherwise the car starts to shake itself to death. I have newer accel injectors about 4,000 miles on them older LT5 wires probably 25-30K miles on them and ac delco coils no idea the mileage its an old set I had on the self to replaced cracked screamon deamon coils that were on the car. car has the chip DRM burned for it after the porting work they did. Now tonight I pulled the plugs and looked at them all but one spark plug looked ok #6 was black the rest looked normal but I am running very rich black soot on my exhaust pipes I know im running rich. so I swaped out #6 with another plug to see if it looks different tomorrow after I drive it to work and back home just to make sure that plug is working. I drove it tonight removing every wire trying to locate a dead cylinder and everyone of them gets worse than it has been with them all pluged in so it seems all my cylinders are firing. what you guys think? do I need a hotter plug perhaps? Im willing to try the cheap aproach first. im going to keep messing with it but looking for ideas. perhaps new plugs wires and coils and go from there? __________________ JOHNNY P Currently own 90 ZR-1 #845 DRM 500 engine package 90 #226 Parts car Hit me up if you need anything.