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06-13-2004, 09:17 PM
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#1 |
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Registered User
Join Date: Nov 2002
Location: Lake Stevens Wa.
Posts: 25
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Hypertech detonation
Anyone out there have detonation probs W/ the Hypertech power programmer? It's a 97 w/ a 350 & 35"s. I just changed my 180 thermo for a 160 and it helped quite a bit but not completely. I also run 92 octane, sometimes w/ octane booster. EGR valve maybe? I haven't checked the timing yet. Thanks in advance.
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'72 Cheyenne/Super 20 4X4 (350) '97 Silverado Ext. Cab Z71 (350,6"susp,35"Mud TA's,Hypertech). '77 C10 stepside (402) '72 Lemans Endura conv. |
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06-13-2004, 10:01 PM
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#2 |
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Registered User
Join Date: Jan 2001
Location: Medicine Hat,AB, Canada
Posts: 194
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I was having problems with my stock Vortec detonating. When I pulled the plugs I found 3 and 5 were so coated I could barely see the electrodes. Arrgh! The dreaded intake manifold gasket thing. Are you using any oil? That was my first sign. Michael
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Michael 1971 GMC Suburban "Crusty" 2000 GMC Sierra 1500 2wd 1978 Scout II 1992 Passat Syncro |
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06-14-2004, 10:48 PM
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#3 |
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Registered User
Join Date: Nov 2002
Location: Lake Stevens Wa.
Posts: 25
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It hasn't used any oil, but it's still due for a plug change.
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'72 Cheyenne/Super 20 4X4 (350) '97 Silverado Ext. Cab Z71 (350,6"susp,35"Mud TA's,Hypertech). '77 C10 stepside (402) '72 Lemans Endura conv. |
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06-15-2004, 06:44 PM
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#4 |
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Registered User
Join Date: Mar 2003
Location: Columbus Ohio
Posts: 1,413
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I have a hypertech power programmer for my 98 350. I have no detonation problems. Hypertech actually calls for 93 octane in the manual that came with my programmer. If you are having problems, then I would give it a tuneup, check the EGR and run a good combustion chamber cleaner (schaeffer's nuetra, Fuel power, Chevron Techron, etc).
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