wont idle / help please

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wont idle / help please

Post  ape550 on 28th May 2014, 22:37

New member so I appreciate any help here! I recently purchased a 66 Falcon with a 429 in it. It started up nicely without even touching the throttle. Idle great after a brief warm up. Heard a rattling sound around cyl 1 & 2 area of valve cover. found very loose rocker and neverless a bad cam lobe and lifter. not knowing what was in it I pulled it apart and found a comp cams 305H10 cam. I called and ordered the exact same replacement with a set of lifters. right away it ran shitty. will not even attempt to idle with throttle stop screw letting it go below 1500 - 2000 rpm. double checked everything, even pulling front cover again and checking timing marks. compression is 220 - 240 on all cyl. plug wire routing correct. nothing had been altered on the carb. did find almost white plugs on cyl. 1,5,and 8. vac leak around manifold???? I used exact same part number intake gasket as well but who knows. has offenhauser port o sonic single plane. has been port matched. 750 dbl pumper. only thing diff is cam lifters and gaskets. gonna try to smoke the intake tomorrow I guess. Thanks for any ideas.

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SOUNDS LIKE you wiped a lobe off the cam

Post  capncruncher1965 on 29th May 2014, 00:26

THATS why I think iam going roller in my new build
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Re: wont idle / help please

Post  dirt_worker on 29th May 2014, 00:31

How are you valves adjusted? Maybe too tight?
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I AGREE dirt worker

Post  capncruncher1965 on 29th May 2014, 00:36

IT JUST nerve racking breaking in flat cams nowdays LOL
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Re: wont idle / help please

Post  Dave C. on 29th May 2014, 01:10

Vacuum leak.

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Re: wont idle / help please

Post  ape550 on 29th May 2014, 09:54

valves were set a 1/2 turn past zero lash. Have already been backed off a 1/4 turn to check that theory. Sure it has to be a vac. leak somehow. Will update on tonites findings.

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Re: wont idle / help please

Post  Dave C. on 29th May 2014, 10:07

Assuming "bad" means the lobes are down on it. If so you'll have metal in the engine . I'd tear it down.

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Re: wont idle / help please

Post  69F100 on 29th May 2014, 13:13

ape550 wrote:valves were set a 1/2 turn past zero lash.  Have already been backed off a 1/4 turn to check that theory.    Sure it has to be a vac. leak somehow.      Will update on tonites findings.


Get the vacuum leak fixed bad vac leak will not let it idle worth a flip but make sure you have the cam broke right before you try idling or you going to be changing the cam again.
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Re: wont idle / help please

Post  ape550 on 29th May 2014, 13:25

I'm gonna hook up the smoke machine to the intake tonight. I pray I find a leak!! If it's not I am at a loss. I have double and triple checked everything else. Idled and ran so nice before even with one cylinder down.

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found it!!!!

Post  ape550 on 29th May 2014, 21:54

Well well well. feel like a dummy. don't know how it happened but the vac. port at the bottom rear of the carb was uncapped. I never touched the carb during the cam change. that's why I didn't inspect it closely. live and learn. Idles just like before now.

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Re: wont idle / help please

Post  Dave C. on 29th May 2014, 22:39

 cheers 

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