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Author Topic: What else to check? Rob [5LVENOM] ¯ Member # 2282 posted                              S-trim, E-cam, stock GT-40 iron headed longblock with 70k well maintained miles (95 cobra). I bounced it off the 6k pill and now it misses bad. Plugs looked good, except #7, black. Replaced all plugs, cap, rotor, still misses. I'm gonna get new wires sat., but I think I holed a piston or busted rings. Ignition and fuel systems are up to the task (MSD6AL,Blaster, FMS wires,cold NGKs, 255intank,T-rex,42s no FMU adj fpr) and it was tuned by Byron 6 mos ago, 11.7-1 A/F, 17* total timing. At that time I didn't have the MSD on the car, so @ 5K rpm, it was blowing out the spark. Is there anything else I should check before tearing it down? Pissed. Thanks -Rob Posts: 421 | Registered: Jan 2003  |  : AaronC ¯ Member # 86 posted                              not sure what it is, but if you think you've holed a piston or blown a HG then I'd have a leakdown test done before pulling anything apart. You can get a lot of valuable info from a leakdown test. Might start there. 93Pony can do it for you. PM him. Posts: 776 | From: woodland | Registered: Dec 2000  |  : BOUNTY HUNTER VERT ¯ Member # 2754 posted                              I had a simular problem to you on my 89 check the oxygen sensors. I hit my rev limiter hard and the car started missing and it finally turned out to be the oxygen sensors. After you change the 02s drive the car around 10 minutes and the miss should go away. Have you checked the compression??? [ July 19, 2003, 09:50 AM: Message edited by: BOUNTY HUNTER VERT ] -------------------- 89 Saleen vert Bounty Hunter racing http://www.corral.net/photopost/showphoto.php?photo=1324&papass=&sort=1&size=medium&thecat= Its all stock and slow wanna run. Posts: 899 | From: ca | Registered: Apr 2003  |  : Rob [5LVENOM] ¯ Member # 2282 posted                              Thanks for the replies, I'll do a compression test today, and go from there. Posts: 421 | Registered: Jan 2003  |  : 67aquafastback ¯ Member # 3090 posted                              Thats a good starting point compression test first. If it fails the compression test then a leak down test would not hurt to help pin point source Valves, headgasket or faulty rings or piston need any help let me know I have the testers Doug -------------------- http://f1.pg.photos.yahoo.com/bc/dougs289/lst?.dir=/house&.src=ph&.order=&.view=t&.done=http%3a//f1.pg.photos.yahoo.com/ Posts: 56 | From: Fiji | Registered: Jul 2003  |  : jmcclesk Moderator Member # 1355 posted                              call me I can help 916-395-6747 -------------------- Ford trained ASE master tech. Posts: 4024 | From: marrysville | Registered: May 2002  |  : Rob [5LVENOM] ¯ Member # 2282 posted                              #7 was 0 psi. F@#K! I'll be pulling the head soon, and hopefully its valve/valvetrian issue and not piston. Keep you guys posted though. 331 maybe? Posts: 421 | Registered: Jan 2003  |  :

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