Reddtarga
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3SGE pinking
Pinking under acceleration.
One of the MR2 club members asked me what would cause this on his '90 model NA
He has just had a timing belt change, new water pump etc, and distributor reco to stop an oil leak.
He says the problem was not there before the work was done.
Btw the spark timing has been properly checked, and it still does it even using 98 fuel.
Anyone got any ideas?
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dasic1
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Re: 3SGE pinking
2013/12/03 15:31:48
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sounds like the timing belt might not be installed correctly
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Reddtarga
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Re: 3SGE pinking
2013/12/04 12:46:42
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Thanks Andrew, that's what I would have thought too, unless anyone else has any ideas.
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Shaz
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Re: 3SGE pinking
2013/12/04 13:43:17
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Mine sounded like it was pinging for a while too. I had the spark plugs changed that helped a bit, then also had the leads changed when the new clutch went in. Fixed......
Altho you probably already checked them.
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Reddtarga
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Re: 3SGE pinking
2013/12/04 13:53:56
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Thanks Shaz, I'll pass that info on to the owner.
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track_mr2
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Re: 3SGE pinking
2013/12/04 14:19:36
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How do you know its actually pinging? Is it just making a pinging noise because I'd be very suprised if it is actually 'pinging' (detonating).
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Reddtarga
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Re: 3SGE pinking
2013/12/04 17:59:08
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track_mr2
How do you know its actually pinging? Is it just making a pinging noise because I'd be very suprised if it is actually 'pinging' (detonating).
AFAIK pinging and detonation seem to be defined differently. Anyway a stock gen2 3sge should not even give light pinging, even on 91 RON, so something is out of whack. Although I know the gen3 motors can have a problem with pinging and run best on 98 RON.
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artymr2
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Re: 3SGE pinking
2013/12/04 21:01:31
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Pinging, detonation, pre ignition. My understanding it is all essentially the same thing, uncontrolled combustion occurring prior to actual ignition timing and can be very damaging if prolonged under high loads , especially on turbo engines.
It's most likely to occur at revs where peak torque is developed and is a unique and distinct sound.
If you timing is too advanced it will cause it. Are your temp sensors all ok? Even if your base timing is ok if the ecu thinks the engine is always cold it it will alter the actual timing.
Are Spark plugs the correct heat range and gap? Maybe you have carbon build up which can cause it.
Does it do it all the time? Only during certain conditions? Easy to turn it on and off with throttle application? Would be worthwhile confirming correct cam timing as it is odd the problem only surfaced post replacement.
Cheers
Black SW20 GT Turbo T-top 
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track_mr2
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Re: 3SGE pinking
2013/12/05 08:19:02
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Because MR2 NA's don't run very high compression or have particularly agressive cams and tuning it is really hard to have them pinging. When most people say there car is pinging it really isn't, its just a rattle noise comming from something like a cracked exhaust bracket or timing belt cover etc....
Worst possible case considering they just had the timing belt done is the cam gears aren't aligned properly but that will give you an odd noise all the time not just under heavy acceleration plus your car will be noticably slower.
If your not dropping any power it will be something else.
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MR2
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Re: 3SGE pinking
2013/12/06 16:10:45
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Sound like the timing is advanced....try backing off the dizzy abit
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wiz
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Re: 3SGE pinking
2013/12/06 22:55:36
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Reddtarga
track_mr2
How do you know its actually pinging? Is it just making a pinging noise because I'd be very suprised if it is actually 'pinging' (detonating).
AFAIK pinging and detonation seem to be defined differently.
Anyway a stock gen2 3sge should not even give light pinging, even on 91 RON, so something is out of whack.
Although I know the gen3 motors can have a problem with pinging and run best on 98 RON.
Yeah----you are right there, my '97 Gen 3 used to ping on light throttle when cruising but not under load. This was pre '98 ron days, but once I got the higher octane into it the pinging all but vanished. I also replaced spark plugs with ones which were one stage colder and this fixed the problem totally. If his plugs were changed during repairs this may bear looking into in case they were the wrong heat range as someone mentioned earlier. The obvious one of course is the timing belt may be one cog out & probably is worth checking as well. These earlier models were not renown for pinging however as they had lower compression than the gen 3.
post edited by wiz - 2013/12/06 22:59:07
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Reddtarga
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Re: 3SGE pinking
2013/12/07 13:20:17
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Thanks for the comments everyone.
The owner has booked the car in to check the cam timing as a first step.
I will be interested to find out what is causing the problem, and will post up the results.
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Gatesys SW20
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Re: 3SGE pinking
2013/12/22 10:10:52
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did you find out what was the cause?
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Reddtarga
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Re: 3SGE pinking
2013/12/23 10:30:33
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I haven't heard from him yet, but will post when I know.
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