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11-30-2007, 11:45 PM | #1 |
Registered Member
Join Date: Jun 2007
Posts: 28
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knocking mustang 5.0
i have an 89 coupe and just installed a new set of gt40 heads, e303 cam, and 1.7 crane rockers. when starting the car up for the first time there was a loud knocking noise. i thought the valves hit the piston since it was pretty loud, but the numbers show plenty of room for this combo. anyhow, i took one head off and found that everything looks fine and that there are no signs of the valves hitting. i put everything back together and still get a knocking. other mods are c&l 76 mm maf, bbk 70 mm tb, tf track heat upper and lower, and heads are port matched on both the intake and exhaust. i bought spark plugs based on a '93 cobra. even when i retard the timing it doesn't seem to have a possitive effect. any ideas?
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12-01-2007, 09:12 AM | #2 |
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Join Date: Nov 2006
Location: Naples FL
Posts: 106
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Re: knocking mustang 5.0
bent push rod? bad rocker? loose rocker? bent valve?
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ZEX |
12-01-2007, 11:57 AM | #3 |
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Join Date: Apr 2001
Location: Staging lane
Posts: 4,337
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Re: knocking mustang 5.0
Take off all of the rockers and pushrods and inspect eveything. Look for bent pushrods or damaged rockers. The rockers are pedistal mount right???
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92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer |
12-07-2007, 09:47 PM | #4 |
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Join Date: Jun 2007
Posts: 28
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Re: knocking mustang 5.0
i ended up finding out that it was just a timing issue. just backfiring...but now i have a couple other related issues. i can't seem to set the timing to 14 like it was before. at 14 i get backfiring and it won't idle or run well unless it is advance way to high at about 22-25. it doesn't seem to ping even though it is high, so i thought maybe the timing marker is off or something, but it looks to be at the same location as my friends coupe. i'm going to put it on the computer and start checking codes.
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12-11-2007, 12:00 PM | #5 |
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Join Date: Apr 2001
Location: Gallatin, Tn
Posts: 1,326
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Re: knocking mustang 5.0
Sounds like you a tooth off. Pull the dist, set engine to TDC, and restab it. Double check your ignition wires as well to make sure you don't accidentally have one crossed.
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12-11-2007, 10:37 PM | #6 |
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Join Date: Dec 2006
Location: new york
Posts: 482
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Re: knocking mustang 5.0
13726548 firing order and i think u point the rotor to the ft drivers side upper intake bolt its like 1 oclock
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347 stroker all forged,arp everything,stud mains w/girdle,7qt pan,full roller, custom cam, aluminum heads swirl valves 5 angle valve job.quick fuel 750,areomotive pump,cobras w/nitto drags,and m/t et drags for the track, ford racing 373 gears,centerforce clutch,tko500,underdrive pulleys,bassani x-pipe,flowmasters ^best et so far 11.6 1.61 60ft coming soon 9sec et's 1992 mustang gt 2001 gmc 1500 4x4 78 century boat 92 skidoo |
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