ohiostate454 Posted September 28, 2012 Share Posted September 28, 2012 I know everyone here hates GM but I just happen to have a 99 silverado and i have been working on it since I got it from my grandpa a few months ago. I have done some body work and done some slight performance upgrades plugs throttle body spacer cold air intake. Which leads me to my problem. Shortly after putting the Specter cold air kit on I noticed when it is cold out that I get some spark knock, the computer was suppose to adjust its self to make the new system work (according to GM). I want to put dual thrush's on it my buddy gave me but I also don't want to make the knock worse. anybody got any ideas on what to do? I asked on a silverado forum but they all act like your an idoit and offer no help cause all other forums suck. Hopefully one day I will actually have a Manche to call my own and ask some Comanche specific questions :thumbsup: :MJ 1: . Any help would be great tho thanks Link to comment Share on other sites More sharing options...
knever3 Posted September 28, 2012 Share Posted September 28, 2012 Have you bought a programmer yet? The computer can't just auto adjust if it doesn't know if upgrades have been added. I don't hate GM, they have the largest aftermarket and they are cheap to work on. I won't go there as to why. Maybe the spark knock was already there but not noticeable with the stock intake. First off buy a 3M fuel injection pressurized cleaning system, have a shop connect it and disable the fuel pump and run it off the pressurized can until the truck quits. Re-enable the fuel pump and buy some AMSOIL Pi fuel injection cleaner for two tanks of fuel back to back. This should clean the injectors the combustion chambers and the intake. Also check or replace the pcv valve. Then think about the programmer, you still need one. Link to comment Share on other sites More sharing options...
mvusse Posted September 28, 2012 Share Posted September 28, 2012 Or go to a higher octane gasoline... Link to comment Share on other sites More sharing options...
Automan2164 Posted September 28, 2012 Share Posted September 28, 2012 What kind of plugs did you 'upgrade' to? Rob Link to comment Share on other sites More sharing options...
ohiostate454 Posted September 28, 2012 Author Share Posted September 28, 2012 Right now I am trying out those E3 plugs they are about a year old. The programmer is on the list I just am working on saving up the money driving 36 miles to school one way 4 days a week and working at subway doesnt leave a whole lot of room for money saving lol. I thought about the higher octane gas but I just spent 90 bucks in unleaded to fill up I ran the higher octane once when it was cheaper and didnt notice much of an improvment. I was going to run injector cleaner and maybe some oil additive but I didnt know what was the good stuff was and what the stuff that will hurt it in the long run was. Link to comment Share on other sites More sharing options...
Pete M Posted September 28, 2012 Share Posted September 28, 2012 I don't hate GM, I just hate the 2.8 engine blocks that GM sold Jeep. :yes: and the aztek. I hate the aztek. and GM's insistence on IFS in their big trucks. hate that too. Link to comment Share on other sites More sharing options...
Automan2164 Posted September 28, 2012 Share Posted September 28, 2012 I would put Delco plugs back in it and see what happens... I'm always surprised about how picky some engines are about brand of plugs. Rob Link to comment Share on other sites More sharing options...
ohiostate454 Posted September 28, 2012 Author Share Posted September 28, 2012 I might just have to do that I agree with the A**TEK and gms no soild front axles. Had a fiero with the 2.8 though and didnt mind it. hopefully I can just find a Comanche and only drive my silverado in the winter Link to comment Share on other sites More sharing options...
Pete M Posted September 28, 2012 Share Posted September 28, 2012 but that was a "GM" block. the conspiracy theory is that there's something wrong with the "Jeep" blocks... Link to comment Share on other sites More sharing options...
Zenobian_84 Posted September 28, 2012 Share Posted September 28, 2012 I would go with Rob's advice; some engines in the GM family are picky about those Delco plugs, I've seen it before. Oh, and it is a conspiracy Pete. "Truck" Code Engine my rear end! Those clods at AMC were too lazy to check the goods GM was dropping off at Kenosha I tell you! :yes: :fs1: Link to comment Share on other sites More sharing options...
richasco Posted September 28, 2012 Share Posted September 28, 2012 Put regular plugs back in, those E3 plugs are a gimmick to seperate you from your hard earned money. You should think about putting the stock air intake back in as well. Colder air decreases fuel atomization. Also since no one else has mentioned it, if you are serious about saving money sell the truck and get a suitable commuter car. You will be suprised at how much money will be left in your bank account when you don't spend it commuting in a full-size truck. Link to comment Share on other sites More sharing options...
mvusse Posted September 28, 2012 Share Posted September 28, 2012 Had a memory lapse that got jogged by some of the previous responses. X2 (or 3 or 4) on the AC Delco plugs. I had a 94 Suburban with a 350 and it seemed to hate any spark plug except the stock AC Delco ones. Link to comment Share on other sites More sharing options...
knever3 Posted September 29, 2012 Share Posted September 29, 2012 I have installed the e3 plugs in my new stroker motor, we'll see how they work out. A good point to mention is what heat range of plug they selected, my stroker might run better on the e3's because of heat of a higher compression. A stock high mileage might not. e3 plugs are an EXCELLENT design but without the proper heat range plug they are no better than stock. Link to comment Share on other sites More sharing options...
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