what vacuum line are you sucking it through? do you suck it through then let it sit for a little while, then drive it? or do you suck it through and drive it immediately after?

 

Ever seen the smoke fest it causes??? LOL check it out on you tube...
Like I said for mine to do that for an hour shows how bad the carbon build up was in mine. Shops charge a fortune for this service.

 

You can use the vacume boster or the fuel pressure regulator vacume source

 

Let it sit 5-10 min then turn it back on and drive it. Bunch of how to's of sea foam on You tube

 

alrighty, i'll do that tomorrow if i can get some time to spend on it.

 

so it seems the seafoam has done it's magic, but it was also suggested to me that the intake gaskets might be blown. how often does that happen? i'm not as familiar with the intakes on the truck motors as i am with an ls6 intake or a carbd intake with ls6 gaskets. i've had these manifolds off before to do knock sensors and never thought twice about reusing intake gaskets. the idea was suggested by a shop forman from one of my local shops. he says they do a bunch of them, yet i've never heard/read about them being an issue? what you guys think?

the reason i'm still wondering about this is because i'm thinking of doing knock sensors and maybe a deep clean on the top end of the motor while the intake is off. more as a preventative maintenance deal than anything else

 

I change my fuel filter around ever 10k-15k. My truck is really sensitive with its fuel. With out looking at mileage I can tell when its time for a fuel filter change on my truck. For $15 bucks and 10 minutes its an easy fix that may help you out.

 

oh for sure, i just never had to change them that often. well, it's got some seafoam in the tank right now, so i'll change it right before i put more fuel in it. good idea.

 

So did it take care of the pinging? It may be that the knock sensors are not detecting knock and it's staying in the high octane table. There's some vehicles that are really sensitive and some that don't pick up knock even if it's audible. The vehicle has a high and a low octane table if it picks up the knock it goes into the low octane table and if it still picks up knock it will automatically remove timing through knock retard. That is if the knock sensors are doing there job

 

i have not heard audible ping since i did the seafoam. i'm still considering doing knock sensors/harness/intake gaskets anyways since it's got 90K miles on it now.