The Macinist
Newbie
I replaced the plugs in September, maybe 1000 miles ago. I am running AC Delco. Don't remember the number, but it is whatever is spec'd stock.I have a few questions for you, and they may or may not solve your problem. First, how long ago did you replace your plugs. If you don't mind me asking, which brand and part number did you use?
If I were you, I would use only AC Delco plugs. It's also recommended to run plugs that are 1 heat range colder than stock to avoid detonation. I'm currently running AC Delco R42TS (stock would be R43TS, the second number indicates heat range).
Canepa design did the installation when it was new. They had a system where people would bring them a new Suburban, check the boxes for the upgrades they wanted, and they would build it. I'm sure they tuned it. They are a high-end tuner. They build race cars and such.Second, do you know if the truck had a custom tune installed with the supercharger? You said it was installed when new, so how long has this thing been on?
I know. That was disappointing. I will get there. The truck doesn't get driven much.Third, sounds to me like you have some other serious issues going on. Oil on your plugs, burning through oil pretty fast, smoking under throttle. I'd say it's time for a rebuild. At the very least, I would do a compression test to see if your valves/piston rings are still good.
And just curious, how much boost are you currently putting through the motor? How many miles are on it?
I have no idea how much boost. 105k miles.
OH, and I almost forgot, is your coil currently mounted to the intake manifold kind of underneath the throttle body? That's where my kit had mine relocated, and I found that it was overheating the coil and giving me a starting issue. I know you said you swapped coils, but just something that I had an issue with that may or may not help.
That's where the coil is. Pretty much under the throttle body, slightly off to the driver side. The throttle body is mounted sideways behind the supercharger, almost up against the firewall.
Thanks for everybody's help here. I talked to the mechanic who works next to my shop today. He said the pickup coil is a common problem on these too.
I just took the Burb out for a test drive and it is running strong. Still blowing a fair amount of smoke though.