Spark knock

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Aug 6, 2007 | 06:48 PM

roadrunner doug

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Spark knock

I have had a apark knock and missing problem about 6 months now.It is only under load.The motor misses and knocks.I have been running mid grade fuel lately and seem s to help.I had done a tune up to help,I thought it was a miss.I was told to watch the routing of plug wires on a 351.Spark jump.So I changed them.Any ideas.WE did a fuel ijector and throttle body cleaning also,and fuel filter.Thanks

Aug 6, 2007 | 06:57 PM

mstrelectrician

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From: north carolina

check your ignition timing, around here gas seems to be of a lower quality more and more. Plug wire looms may help. If all else fails check your timing chain, total engine timing.

Aug 6, 2007 | 07:11 PM

roadrunner doug

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My buddy said that if we reset the timing the computer will reset it back.The truck has 160.000 on it.Do you think it will help???Thanks for the responce.

Aug 6, 2007 | 07:39 PM

92F150Flare

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From: Goose Creek SC

Welcome to FTE

Do you have any codes? Go here and check for codes

http://www.fordfuelinjection.com/?p=13

My 5.0 was missing under load......Might have been pinging too....i'm too hard of hearing to know......

Anyway......I got the plug wire routing info and re-routed my wires (new ones) and it stopped.

Here's the info..
https://www.ford-trucks.com/forums/6...e-routing.html

Believe me.....you have to follow it........try that and see.

At 160k your timing chain could be going bad......causing it to be out of time some. Get a timing light and check it, see where it is and if it's where it's sposed to be. Resetting the computer isn't going to change the timing if it's a bad chain.

Good Luck
Bob

Aug 6, 2007 | 08:27 PM

roadrunner doug

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Thanks,does that apply to the 5.8 or 351 the same???

Aug 7, 2007 | 08:13 AM

92F150Flare

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From: Goose Creek SC

Look at the different pics that bobcf put in there....the 1,3 and 1,5.......both 5.0 and 5.8.

Aug 7, 2007 | 05:48 PM

lostin90s

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From: Central PA

I'm workin on same thing without miss. Clean Iac and check egr for sticking as well as check for vac leaks . What they told me to do in injection forum .I just did get to do yet .