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| 4.6 Tech (96-04) Discuss the 1996-2004 2-Valve GT & 4-Valve Cobra |
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05-02-2006, 01:00 AM
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#1 |
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Registered User
Join Date: Aug 2003
Posts: 56
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Cobra Engine Swap
Swapped out my SOHC to a 98 DOHC. Changed all electronics (MAF;injectors;wiring harness;CPU) and now the engine hesitates at about 4000rpm. Its not popping, it just lets up on the power then comes back. But if I am at a dead stop then I punch it the car doesnt hesitate at all. It only does it once your cruising and then get on it. I got a check engine light so I will get the codes tommorow but was wondering if anyone has suggestions. Also the idle seems to bounce when coasting.
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 MODS: Cobra body kit,98 COBRA 32V Engine,C&L inlet pipe,BBK single blade T/B, Walboro 255 fuel pump, MAC O/R X-pipe,MAC Catback, Steeda x2 Balljoints, Tokiko shocks & Struts,Bullit Shifter & Pedals, FRPP Gears, Cobra Brake Conversion,2003 Cobra Rims,FRPP underdrive pullies, UPR caster/camber plates |
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05-02-2006, 02:11 AM
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#3 |
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Registered User
Join Date: Aug 2003
Posts: 56
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whats that??
 Also i just installed new wires (FRPP) and put in new plugs (Platinum II). I think I remember hearing bad things about the FRPP wires a while back?
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MODS: Cobra body kit,98 COBRA 32V Engine,C&L inlet pipe,BBK single blade T/B, Walboro 255 fuel pump, MAC O/R X-pipe,MAC Catback, Steeda x2 Balljoints, Tokiko shocks & Struts,Bullit Shifter & Pedals, FRPP Gears, Cobra Brake Conversion,2003 Cobra Rims,FRPP underdrive pullies, UPR caster/camber plates Last edited by 98stangman; 05-02-2006 at 02:16 AM. |
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05-02-2006, 02:44 AM
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#4 |
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technology > displacement
Join Date: Jun 2003
Location: San Antonio
Posts: 4,671
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intake manifold runner control. closed at low rpm, open at higher, yours probably aren't opening. most people just delete them, but it sounds like thats your problem.
frpp wires are fine.
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05-02-2006, 03:22 AM
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#5 |
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Registered User
Join Date: Aug 2003
Posts: 56
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How do you delete them?? Do they just unbolt?? Where are they located??
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MODS: Cobra body kit,98 COBRA 32V Engine,C&L inlet pipe,BBK single blade T/B, Walboro 255 fuel pump, MAC O/R X-pipe,MAC Catback, Steeda x2 Balljoints, Tokiko shocks & Struts,Bullit Shifter & Pedals, FRPP Gears, Cobra Brake Conversion,2003 Cobra Rims,FRPP underdrive pullies, UPR caster/camber plates |
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05-02-2006, 03:41 AM
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#6 | |
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technology > displacement
Join Date: Jun 2003
Location: San Antonio
Posts: 4,671
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Quote:
IMRC Deletes
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05-04-2006, 09:08 AM
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#7 |
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member B.E.D. Racing
Join Date: Sep 2005
Location: Katy, Texas
Posts: 65
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Did you change your fuel filter?
How about your fuel pressure?
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97 Rio Red Cobra(Gone but not Forgotten) 2003 Sonic Blue Cobra 2005 Corvette Coupe 2008 Pathfinder |
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05-04-2006, 12:01 PM
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#8 |
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Registered User
Join Date: Jul 2005
Location: new braunfels
Posts: 167
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the imrc are stuck
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