engine pinging
- Thread starter 85fj60
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You could have some carbon build up. That'll do it too. Check your plug condition and see what's going on there. It'll tell you a lot.
Personally, I love sea-foam for removing carbon build-up.
I recently ran a can through my 87 and you should have seen the smoke screen in front of the auto-parts store! I had people offering to give me a ride home because they thought my motor just blew!
I recently ran a can through my 87 and you should have seen the smoke screen in front of the auto-parts store! I had people offering to give me a ride home because they thought my motor just blew!
Pskhaat
Tourer
How much advanced is your timing? if at all? Sure it's to spec? Try some high-test fuel in there and see if the sound goes away. You may need to retard your timing with the new rebuild.
Second the sea-foam. Definetely fun to do, one trick I have used is to open up the spark plugs and inject the sea-foam directly into the chamber after it has stalled (stall it by following the directions on the can). Of course this is pointless on a rebuild.
Second the sea-foam. Definetely fun to do, one trick I have used is to open up the spark plugs and inject the sea-foam directly into the chamber after it has stalled (stall it by following the directions on the can). Of course this is pointless on a rebuild.
You might have a higher compression ratio due to a milled head, decked block or overbored pistons. If this is the case, and if egr is working properly, you may simply have to run premium.
Otherwise, look into a lean running carb.
If it is carbon buildup, I've used a product called "Sea Foam". You can get it at
NAPA. The directions are on the can.
BTW, you could also be losing egr anywhere from the exhaust manifold, egr pipe-cooler, flex pipe.
Otherwise, look into a lean running carb.
If it is carbon buildup, I've used a product called "Sea Foam". You can get it at
NAPA. The directions are on the can.
BTW, you could also be losing egr anywhere from the exhaust manifold, egr pipe-cooler, flex pipe.
60wag
SILVER Star
My 2F has had some minor pinging episodes since the rebuild, (stock except 0.050" head shave, bored 0.020" over). I've played with the timing and found that even slightly retarded (3 BTDC) didn't help. I've been thru the emissions stuff, egr, hac, spark advance, etc. All are working correctly. 91 octane usually fixes the pinging, but NOT always. I decided to try some lower temp plugs. I had been running some Autolite 65, I think. I got some Densos with the 20 temp rating. Toyota rec's 14 for the 2F and 16 for the 3F. So far I'm running 85 octane and no pinging. I can't say its positively solved it but it seems to help. The plugs cost something like $14 delivered.
i too recently had mine rebuilt -- .040 bored + desmogged. Jim C recurved the distributor and rebuilt the card and i'm running into the same problem. i've backed off on the timing 2 degress and then 2 more and it didn't solve the problem. If i run 93 octant the problem pretty much goes away.
I'll do a search for these plugs and give them a try.
I'll do a search for these plugs and give them a try.
60wag
SILVER Star
I'm running W20EXR-U11 Denso plugs. I got them from drivewire.com. They are listed as stock for an 88 Pontiac Grand Am LE. There are several cross ref tables that I found on the web. Try Denso, Champion, Autolite or any other plug manufacturer.
I had the ping on hills too.
I had a HEI dist.
I found that the vacuum advance was hooked up wrong. I hooked up the vacuum hoses as they should be for the HEI and the ping went away.
As you had all the hoses of I bet one or more hoses are in the wrong ports.
I spent many a hours getting the hoses replaces as they were cracked. THen when I desmogged I spent more hours getting them right.
I had a HEI dist.
I found that the vacuum advance was hooked up wrong. I hooked up the vacuum hoses as they should be for the HEI and the ping went away.
As you had all the hoses of I bet one or more hoses are in the wrong ports.
I spent many a hours getting the hoses replaces as they were cracked. THen when I desmogged I spent more hours getting them right.
I too have a really bad pinging problem after a head rebuild and Jim C carb rebuild and complete desmog. I've got the dist set at 7 BTDC and dumped octane booster into the tank. Still pinging bad. Hard to get up to 55 mph. I'm using Splitfire plugs.
Help!
CWB
Help!
CWB
Pskhaat
Tourer
First things first. Retard the timing even more so, and plug the advance air line. Then go drive. It may be slightly laggy, but see if the pinging goes away. Do the sea-foam treatment next (it may have questionable results, but is fun 
). If the pinging goes away it may have been due to carbon build-up and/or timing issues. Also, ensure you are not running lean, enrichen the carb just a little bit and see if some pinging may go away.
). If the pinging goes away it may have been due to carbon build-up and/or timing issues. Also, ensure you are not running lean, enrichen the carb just a little bit and see if some pinging may go away.You can and will foul plugs right after a rebuild, the engine uses quite a bit of oil right off the bat. I had a couple problems on my rebuild till I switched too Autolite 65's and put a couple thousand miles on the motor. Retard the timing a few degrees, it helps break the motor in faster, and it depending on fuel octanes may help the pinging.
carbon deposits, I Sea Foamed my 82 fj40 and the pinging is gone, I upped the octane to mid grade for a tank, now I am back to low octane. I do alot of stop and go in town driving.....not enough freeway time to blow the carbon out.
couple questions related to carbon deposits. 1) what's the relationship to carbon buildup and redetonation 2) this is a new rebuild....can carbon build up very quickly or does it take a long time.
With 93 octane i'm running good on the highway -- 75 mph <-- which is pretty much flying in a 60. But back it down to 89 and it starts pinging when i get close to 3K RPMs or start climbing hills.
With 93 octane i'm running good on the highway -- 75 mph <-- which is pretty much flying in a 60. But back it down to 89 and it starts pinging when i get close to 3K RPMs or start climbing hills.
[quote author=pvaman link=board=29;threadid=17020;start=msg171628#msg171628 date=1086748431]
1) what's the relationship to carbon buildup and redetonation 2) this is a new rebuild....can carbon build up very quickly or does it take a long time.
[/quote]
No such thing as "redetonation" with regard to pinging, afaik.
Carbon can cause pinging in 2 ways. The common thread however is heat.
First, carbon buildup raises compression pressure and therefore heat in the combustion chamber causing premature detonation.
Secondly, carbon particles on the piston head can begin to glow red hot and ignite the combustion process prematurely. This is called pre-ignition.
Rebuilds with overbored pistons, decked blocks and milled heads already have increased compression ratios and generate more heat anyway. I can't necessarily say they develop carbon buildup more quickly, but rather that the effects of slight increases in heat are greater and more quickly noticeable.
Seems there are two conflicting theories behind spark plug temperature. Maybe Toyota knew that the 2F's were prone to carbon buildup and decided to spec a hot plug in order to help burn off the carbon. On the other hand, hot plugs themselves can help cause detonation.
For a rebuild, all things being equal (functioning egr, no lean condition, good gas, etc.), like the others have suggested, compensating with a colder plug seems to be a good idea.
1) what's the relationship to carbon buildup and redetonation 2) this is a new rebuild....can carbon build up very quickly or does it take a long time.
[/quote]
No such thing as "redetonation" with regard to pinging, afaik.
Carbon can cause pinging in 2 ways. The common thread however is heat.
First, carbon buildup raises compression pressure and therefore heat in the combustion chamber causing premature detonation.
Secondly, carbon particles on the piston head can begin to glow red hot and ignite the combustion process prematurely. This is called pre-ignition.
Rebuilds with overbored pistons, decked blocks and milled heads already have increased compression ratios and generate more heat anyway. I can't necessarily say they develop carbon buildup more quickly, but rather that the effects of slight increases in heat are greater and more quickly noticeable.
Seems there are two conflicting theories behind spark plug temperature. Maybe Toyota knew that the 2F's were prone to carbon buildup and decided to spec a hot plug in order to help burn off the carbon. On the other hand, hot plugs themselves can help cause detonation.
For a rebuild, all things being equal (functioning egr, no lean condition, good gas, etc.), like the others have suggested, compensating with a colder plug seems to be a good idea.
pvaman said:
Considering all of this, isn't it feasible that if the EGR isn't functioning correctly, you'd get the pinging also? Or would a bad EGR be apparent in other symptoms? (considering that the EGR is there to bring down combustion chamber temp)
Just speculating here...
