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What kind of plugs? And boost problem

J

Jory

New member
Just bought a 98 gtp for cheap. This is my 4th one and I have a little idea of what's going on here but this car has a aftermarket pulley (how do I figure out what size) it has slp headers and a new cat and ubend delete I believe 180 tstat because that's what temp it sticks around. What kind of plugs should i be getting...But here's the problem. First off no boost... I tried looking for a vac leak cuz when the car is in park and u give it a little gas when the rpms drop it dips down to about 500rpm and sounds like it wants to die.. It doesn't ever die but it just about does... So what's the best way to search for a vacume leak.. I did by hand and didn't see anything noticeable wrong... Also I thought maybe the bbv is bad so I will be playing with that tomorrow.. Any other ideas? My stock Lego guage only says about half boost and this thing feels like a stock gt..
 


I can't upload a pic at the moment but it doesn't say what size it's a standard 6rip pulley bolt on style 1 main snout bolt and 6other bolts holding it on it looks like
 
O for the vacuum take a can of starting fluid and start spraying along the vac lines and have someone watch the Tom gauge in the vehicle. If it bounces up and down while ur spraying somewhere u have a leak
 


Yeah I unplugged the bcs and it made maybe a little difference nothing like what this car should be doing... And pulley says nothing on it at all
 
Still haven't gotten around to finding vacuum leak... Still no answer on what plugs to use.... How about auto lite 104s?
 
Take a read here for the plugs...

4) Spark Plugs - Change out those stock spark plugs with new ones to restore any lost power. Brands that most tend to go with are either Copper Core Autolites or NGK's. They range as follows in order from hottest to coldest plugs...remember...you want the hottest spark you can get away with...so running a super cold plug on a larger pulley to combat knock isn't the best plan...OEM replacement ACDelco's, AL606's, and AL605's are basically for stock cars or very small bolt-ons still running the stock S/C Pulley or modded N/A guys...you want to keep a hot spark. NGKTR55/AL104's for your 3.4" Setup, TR6's are a tad cooler...best used around the 3.25" pulley area, and AL103's...are for the extreme supercharged application...3.0" pulley or lower. Here is a picture to reference the firing order and the correct coil number if yours aren't numbered or you just need a quick reference picture: http://i33.photobucket.com/albums/d6.../plugwires.jpg

AC Delco Factory Replacements: Stock
Autolite 606: Stock
Autolite 605: 1 Heat Range Cooler
NGK TR55: 1 Heat Range Cooler
Autolite 104: 2 Heat Ranges Cooler
NGK TR6: 2 Heat Ranges Cooler
Autolite 103: 3 Heat Ranges Cooler
 


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