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09-07-2010, 09:11 AM
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Dark Knight
 
Join Date: Nov 2009
Location: Albuquerque, NM
Posts: 5,759
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My Cars Idle Sounded Like it Had a Heavy Cam.....But it doesn't
My car has been having trouble holding idle for a while now. Today it sounded like my 71 comet at idle which has a very heavy cam'd 302. Too bad my Mach doesn't really have a cam and isn't running right instead, but it still sounded sick!
It also hesitates while driving. Has backfired a few times. And sounds like its missing off and on. My guess is the coils because thats the only thing left I haven't changed other then the fuel system components. But it still runs strong, and doesn't feel like its running on 6 or 7 cylinders all the time at WOT. My question is what coils should I go with. Their has been so much debate on the search I don't even know what to do. Is there something I can datalog to check? It hasn't thrown any codes, at all. What I've Already Done: New TPS sensor New EGR sensor Cleaned IAC and MAF Checked vacuum lines Replaced the front O2 sensors New NGK spark plugs New Fuel Filter New Battery New Battery Terminals Mods MRT H Pipe SSS Catback MAF Adapter with Cone Filter (No MAF Screen) XCAL3 Tune from VMP Miles 70,000 Problem solved see post 7 
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Vortech V2 S-trim, E85, A2A Treadstone, Comp cams, built engine, full exhaust, built rear, built 4r70, more mods. Tuned by me with SCT Advantage Last edited by Mach828; 09-07-2010 at 08:48 PM. |
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09-07-2010, 09:22 AM
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Shitin 'n Gitin
 
Join Date: Mar 2007
Location: Pasadena, MD
Posts: 1,416
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Re: My Cars Idle Sounded Like it Had a Heavy Cam.....But it doesn't
you can check to see if its the coils at idle, its real easy, pull the coil covers off both sides (then hook the intake tube back up) and pull the coils off the spark plugs, when you find the one that doesn't change the idle at all, thats your bad coil.
you also might want to take your car in to have the tune checked out.
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2003 AB Mach -- 442/435 @ the rear ALL MOTOR -Race Gas FRPP BOSS 5.0 block, 10.6:1 compression, Manley H-Beams; Diamond flat-top pistons, P&P heads W/ 5-angle valve job & ARP Head studs, PP upper/lower intake, Comp Stage 2 N/A cams, FR500 springs, valves, and followers, Tube K with coilovers and Bilsteins, Kooks, Stingers, 2.97 T-56 Magnum, 31 Spline Superior axles & Auburn-pro dif, built battle boxes, KB BAP w/ 39lb injectors, and 4:10's. |
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09-07-2010, 10:05 AM
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#3 | |
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Dark Knight
Join Date: Nov 2009
Location: Albuquerque, NM
Posts: 5,759
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Re: My Cars Idle Sounded Like it Had a Heavy Cam.....But it doesn't
Maybe I should just take it to have it dyno tuned. I'll try your coil test. If that doesn't seem like the issue, i'm taking it to get a custom tune.
Quote:
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Vortech V2 S-trim, E85, A2A Treadstone, Comp cams, built engine, full exhaust, built rear, built 4r70, more mods. Tuned by me with SCT Advantage |
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09-07-2010, 01:08 PM
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Dark Knight
Join Date: Nov 2009
Location: Albuquerque, NM
Posts: 5,759
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Re: My Cars Idle Sounded Like it Had a Heavy Cam.....But it doesn't
Any other ideas?
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Vortech V2 S-trim, E85, A2A Treadstone, Comp cams, built engine, full exhaust, built rear, built 4r70, more mods. Tuned by me with SCT Advantage |
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09-07-2010, 02:21 PM
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Mach1 member
Join Date: Aug 2003
Location: East Haven, CT
Posts: 3,349
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Re: My Cars Idle Sounded Like it Had a Heavy Cam.....But it doesn't
Vacuum leak.
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2011 Mustang GT Grabber Blue Automatic 2003 Mach 1 Whipple 2.3 718 rwhp 735 rwtq @25 psi SOLD |
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09-07-2010, 02:43 PM
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never ending project
 
Join Date: Dec 2003
Location: Columbia, SC
Posts: 605
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Re: My Cars Idle Sounded Like it Had a Heavy Cam.....But it doesn't
Quote:
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tuned by ProDyno in Fort Mill 540 hp (5200 rpm) 490 tq I/W 15% OD pulley Vortech V2SQ forged S/B by VT performance Cobra tank with twin GT pumps BBK Long Tubes, custom O/R X w/ magnaflow mufflers 18"x9" AFS Mach 1 wheels Dimpled and slotted rotors MM front coil over kit with Bilstein HD struts MM adjustable LCAs and adjustable pan hard bar MM hd torque arm /removed factory upper arms Rebuilt 3650 / new syncros and shifter forks / Hurst BP RAM HD 950 dual disk clutch and FRP alum d/s |
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09-07-2010, 08:42 PM
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#7 |
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Dark Knight
Join Date: Nov 2009
Location: Albuquerque, NM
Posts: 5,759
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Re: My Cars Idle Sounded Like it Had a Heavy Cam.....But it doesn't
So I was looking around and I tugged on a small ground wire that bolts to the front of the car between the radiator, just above the head light. It pulled out of its connector with almost no effort and the car shut off. It was rusted and corruted to all hell inside. Changed the wire and connector, along with the bolt, and problem solved! Score! YAY!
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Vortech V2 S-trim, E85, A2A Treadstone, Comp cams, built engine, full exhaust, built rear, built 4r70, more mods. Tuned by me with SCT Advantage |
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09-07-2010, 09:09 PM
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Registered User
Join Date: Mar 2010
Location: Albuquerque, NM
Posts: 1,746
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Re: My Cars Idle Sounded Like it Had a Heavy Cam.....But it doesn't
Lucky. I was about to suggest that your MAF might be bad.
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