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spark knock

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Old May 12, 2015 | 10:09 PM
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spark knock
I have a 89 f150. When warm I believe it has some spark knock. I have tried seafoam and It didnt really help. 91 octane helped slightly. I have not checked the timing yet, but it doesn't idle high or anything like the timing is to high. Also it kind of surges at idle sometimes, and it used to die when first started until I switches
 
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Old May 12, 2015 | 10:41 PM
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Which engine do you have? On my I-6 I was getting some spark knock until I disconnected my egr valve.
 
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Old May 12, 2015 | 10:49 PM
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Originally Posted by nwjones18
Which engine do you have? On my I-6 I was getting some spark knock until I disconnected my egr valve.
302, and I just reconnected the vacuum line about a week ago, it was still doing it with the vacuum line off
 
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Old May 12, 2015 | 10:58 PM
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Mine was doing that when I had a loose spark plug.
 
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Old May 13, 2015 | 04:32 PM
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I certainly wouldn't think of high idle being a symptom of too much spark advance. Knock is definitely a symptom. If it really is preignition ("knock"), then you've got too much spark advance given everything else (fuel octane, compression ratio, carbon deposits, etc)
 
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Old May 13, 2015 | 09:28 PM
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I will probably just retard the timing a degree or two this weekend and see where that gets me
 
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Old May 14, 2015 | 07:53 PM
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Tried playing with the timing and by the time it helped it was was to doggy to be drivable, so I put the timing back and pulled codes and got code 23 for tps? Can a tps cause spark knock?
 
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Old May 15, 2015 | 09:32 AM
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Originally Posted by 1990-f250
Tried playing with the timing and by the time it helped it was was to doggy to be drivable, so I put the timing back and pulled codes and got code 23 for tps? Can a tps cause spark knock?

Since the timing is not solving it, im going to run a bottle of techron fuel system cleaner through it, ive read good stuff about it.
 
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Old May 15, 2015 | 09:53 AM
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Originally Posted by 1990-f250
pulled codes and got code 23 for tps? Can a tps cause spark knock?
It's possible......the PCM relies on the TPS for accurate throttle position feedback. If the output is low it may not pull enough timing when it sees the value and rate of change.
 
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Old May 17, 2015 | 09:32 PM
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Well it all but just stopped the spark knock. I put techron in the tank and unplugged the egr. I have a check engine light now, but thats better than burnt pistons haha
 
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