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Old 08-13-2005, 08:36 PM
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pinging

is pinging a result of to much advance or retardo

seems like my motor is pinging once in a while. i notice after i fill up with gas then after a few mins it will get smoother again for a little while and go back to pinging off and on time to time.

probaly doesnt matter as most engines would be the same but its a 88 chevy 2.8L MPI

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Old 08-13-2005, 08:40 PM
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Too much advance....................or low octane gas.

Try some premium.........if you can afford it. Regular was 99.9/litre here today.
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Old 08-13-2005, 08:43 PM
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right on thanks

yeah regular is 98.9 and premuim goes for 109.9

BTW what would happen if you run to high octane in a engine?
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Old 08-13-2005, 08:46 PM
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Quote:
Originally Posted by montea
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BTW what would happen if you run to high octane in a engine?
You waste your money......can't hurt it.
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Old 08-14-2005, 02:27 AM
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Might be cheaper to retard your timing a tad, or try switching fuel brands
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Old 08-14-2005, 01:45 PM
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i already tried the brand change, first was using 7-11 as they are a couple blocks away then went to esso and now im only using petro.

today im going to go out and set the timing back a couple of degrees and see what it does.
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Old 08-14-2005, 03:00 PM
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Pinging is pre-detonation. Your spark plug is igniting the gas slightly before your piston gets all the way to the top. As your piston is still trying to complete its upward travel the explosion from igniting the air fuel mixture is blowing it back down... there fore the ping..It is just like hitting your piston with a hammer. It is really hard on an engine. Retard your timing just a little and see if it helps, if not try a higher octane gas.
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Old 08-17-2005, 12:22 AM
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backing the timing down a little like 1 degree? i moved it down to 9.5 degrees from 11 and i still getting pinging but it doesnt alway ping. i was going down the street and it was pinging then came to a stop and took off again and no pinging... then it started doing it again alittle later on. think i should back it down another degree or is the higher octane my only choice? factory timing supposed to be 10 degrees.

also is there other things besides fuel and timing that could cause pinging?

Thanks again

oh also the engine is supposed to have 8.9:1 compression ratio
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Old 08-17-2005, 04:55 AM
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Quote:
Originally Posted by montea
backing the timing down a little like 1 degree? i moved it down to 9.5 degrees from 11 and i still getting pinging but it doesnt alway ping. i was going down the street and it was pinging then came to a stop and took off again and no pinging... then it started doing it again alittle later on. think i should back it down another degree or is the higher octane my only choice? factory timing supposed to be 10 degrees.

also is there other things besides fuel and timing that could cause pinging?

Thanks again

oh also the engine is supposed to have 8.9:1 compression ratio
I am not trying to be a smart a**
but are you really hearing a ping or valve lifter just making noise
I had a lifter in a 1977 425 c.i. caddy that would act up from time to time
I had to let others (auto heads)listen with me to verify the noise.
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Old 08-17-2005, 10:23 AM
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very well could be a lifter for all i know, is there a way of finding out besides letting a auto head check it out?

what kind of damage could happening with a ticking lifter?

Thank you
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Old 08-17-2005, 04:33 PM
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Actual pinging occurs under acceleration. It sounds kinda like a little rattle sound when you accelrate or are under a load, pulling a hill etc.. A lifter would be more like a clicking type sound. You would hear the lifter at anytime, idleing, coasting, light acceleration, etc.
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Old 08-17-2005, 08:30 PM
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Quote:
Originally Posted by montea
very well could be a lifter for all i know, is there a way of finding out besides letting a auto head check it out?

what kind of damage could happening with a ticking lifter?

Thank you
The lifter was some-timey
Some-times under heavy throttle
Never at idle( thats why I made the statement in earlier post of lifter)
Some-times taking off from green light.
Network with others that have mechanical skill and knowledge in your area
Two heads together ,will add up to a solution
I Just want to help u out and adjust it or get it fixed.
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Old 08-17-2005, 09:30 PM
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well i finnaly was down to 1/4 tank so i filled up with premium 91 and wow did that make a differnce, it runs smoother, engine/exhaust sounds better, quiker throttle response and power, and no pinging/ticking yet. but i only drove home from the station so it was only a 5-10 min drive.
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Old 08-18-2005, 05:16 AM
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Quote:
Originally Posted by montea
well i finnaly was down to 1/4 tank so i filled up with premium 91 and wow did that make a differnce, it runs smoother, engine/exhaust sounds better, quiker throttle response and power, and no pinging/ticking yet. but i only drove home from the station so it was only a 5-10 min drive.
I have had problems with different types of low grade gas at certain stations
I make it a normal rountine to fuel at certain stations with a certain type of (hi-test)or High octane fuel.
I found a good article
http://www.consumeraffairs.com/news04/ia_gas.html
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Old 08-19-2005, 12:10 AM
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Henry: FYI:
There's no such term as "pre-detonation."

Pre-ignition is the term you identified.
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