mrpositraction

Does anyone know if the tuning on these motors pulls boost if the spark isn't what it should be? (or conditions cause by poor spark)

Here is why I ask!

I just changed my stock plugs (that were already gapped to 0.30") at 45,000 miles with another set of stock plugs gapped at 0.30" again.

Before the plug change I would usually see while at WOT in the mid-rpms about 16-17 psi of boost.

After the plug change in the same conditions I am seeing 18-19 psi of boost while at WOT in mid -rpms.

Is there anything to explain this or just crazy coincidence?

Joewee3.5

Very interesting. Makes me want to change my plugs lol.

mrpositraction

Well I thought of one scenario on the drive home from work tonight that would make this happen. I had to work around where I tied into the vacuum line. Had it been leaking a little bit around that I very possibly could have bumped it and "sealed" it up.

All I know the truck idles better and seems to run smoother, though, it could just be in my head.