redwolf624 Posted August 21, 2013 Share Posted August 21, 2013 i got to thinkin today which never ends well, i realized that i gapped my spark plugs for an 86 jeep comanche (bein that that's what i have) instead of a 93 GMC sonoma which is what my engine came out of, they're both 2.8 V6s but are the spark plug gap different? i'm just tryin to get every little thing right on my truck, and i was thinkin that maybe if i have the plugs gapped for a 93 sonoma my MJ will run a little more smoother :D always worth askin on here, Redwolf Link to comment Share on other sites More sharing options...
Keyav8r Posted August 21, 2013 Share Posted August 21, 2013 Call Advance Auto or NAPA and ask them if they show the plug gap for the vehicle the engine came from. Link to comment Share on other sites More sharing options...
redwolf624 Posted August 22, 2013 Author Share Posted August 22, 2013 Call Advance Auto or NAPA and ask them if they show the plug gap for the vehicle the engine came from. tried, the advance i normally go to had a stupid person answear the phone and didn't understand the question and napa was closed, tomorrow i gotta go out by a adv so i might swing into there and ask em, Redwolf Link to comment Share on other sites More sharing options...
Minuit Posted August 22, 2013 Share Posted August 22, 2013 I'm not a GM guy and certainly not a 2.8 guy but I think it's .045. Link to comment Share on other sites More sharing options...
redwolf624 Posted August 22, 2013 Author Share Posted August 22, 2013 I'm not a GM guy and certainly not a 2.8 guy but I think it's .045. ok, i'll run into the adv tomorrow when i get done with what i gotta do in that area, i know the manager there and he has had nothin but fords and GMs so he'll know for sure, i'm thinkin it should be the same for all 2.8 V6s but yet again what did everyone keep the same with em other than the shape, they all added their own tweak, Redwolf Link to comment Share on other sites More sharing options...
FrankTheDog Posted August 22, 2013 Share Posted August 22, 2013 It's not going to make any difference. Using the sonoma settings will be fine. Link to comment Share on other sites More sharing options...
Biotex Posted August 22, 2013 Share Posted August 22, 2013 You can generally run a .040 to .045 gap if it is a GM motor and you have an HEI ignition. If it is an older ford or jeep running the motorcraft ignition module, I'd run .035 to .038. If it is the even older prestolite module. I'd run no more than .035. What happens, is the larger the gap, the more spark energy you have. This puts the load on the coil and the module. If you add a dedicated ground to the modules (the black wire) you can help protect the module. The E-core style ford coils can handle up to a .045 gap, and are a good upgrade over the canister oil filled coils. I have no experience with the renix era and newer plug gaps, as I'm 'old school'. Link to comment Share on other sites More sharing options...
redwolf624 Posted August 22, 2013 Author Share Posted August 22, 2013 it's 0.045 for the engine i first had in my truck and for the engine i have in there now, Redwolf Link to comment Share on other sites More sharing options...
cz777 Posted October 2, 2013 Share Posted October 2, 2013 You can generally run a .040 to .045 gap if it is a GM motor and you have an HEI ignition. If it is an older ford or jeep running the motorcraft ignition module, I'd run .035 to .038. If it is the even older prestolite module. I'd run no more than .035. What happens, is the larger the gap, the more spark energy you have. This puts the load on the coil and the module. If you add a dedicated ground to the modules (the black wire) you can help protect the module. The E-core style ford coils can handle up to a .045 gap, and are a good upgrade over the canister oil filled coils. I have no experience with the renix era and newer plug gaps, as I'm 'old school'. this should be a sticky .....note on the plugs get NGK hands down with .40 should do the trick ..... Link to comment Share on other sites More sharing options...
jimoshel Posted October 2, 2013 Share Posted October 2, 2013 .041 for the 2.8 regardless of in a Jeep or GM Link to comment Share on other sites More sharing options...
gogmorgo Posted October 2, 2013 Share Posted October 2, 2013 The proper spark plug gap is always on the emissions sticker, no? Link to comment Share on other sites More sharing options...
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