I recently replaced my lower intake manifold and install reconditioned Bosch fuel injectors 24# and four holes. I removed the valve covers and painted them. Everything back together per all specs. Truck was running like crap. I checked timing and it was ok. Then I watched the engine in the dark and saw a spark jumping from number four plug to a loose connection. I checked the plug for possible fouling and it was clean and gaped to specs. Since then I have a ticking rattle coming from the engine under low load. Nothing at idle and nothing at WOT. Can't hear anything at cruising speed.

I have tried various timing settings and the sound is still there when advanced or retarded. I have run all codes and have absolutely none. The truck did not make this sound before the replacement. To my untrained ear it sounds like a lifter. The manifold and injectors are the only thing changed. The manifold had been machined (so they say) and it looked it. The injectors are direct OEM replacement. Does anyone have a clue what I could check at this point? I realize a sound can not be reproduced in text or diagnosed but what I posted is the best I can do. Thanks for any ideas or help. Sandy

 

try swapping the plug/plug wire and see if you have an intermittent plug /plug wire problem?

 

For sure I will try that. Will be Wednesday. It just doesn't make sense so everything is suspect. Thanks for the idea. Sandy

 

If you can tell which side, try a long piece of rubber hose to ear, and check injectors, one could be loud open/close, dont forget wire routing

 

Good idea on checking the injectors. I will do that. The plug diagram does not match my 460.

 

#1 is just clocked different, maybe this one, rla2005 posted is better

 

Yes that's it. I think this one is for a distributor cap that already has number one marked on it.

 

Also, make sure the wires are routed correctly. To avoid spark crossing over. Some ford engines are sensitive to this.

 

Thanks .I know, #8 is one of those. I'll double check. Sandy

 

I have tried all the good ideas above and no luck. Don't slam me but I did replace the distributor just because. It has been leaking oil for a while and I had replaced the o ring and put a new gasket on top. Still leaking, so I bought a NEW Spectra Premium today and put it on hoping to fix the leak and hopefully the noise it is making if it was a timing issue.. Leak has stopped but noise is there but seems to not be as pronounced now. But it is still there. I guess at this point, unless someone has a suggestion to try, I will just drive it till it does whatever it's going to do. I did try some premium gas also. Thanks for all the suggestions and ideas and I will let you know when/if it bites the dust. Sandy