Based on a bit of research, I am starting to wonder if it isn't the octane selector - in a perfect world this thing should need no adjusting. But having the selector out of sync with the timing would most certainly create a lot of pinging/rattling, but only when trying to accelerate - then the sound will go away when you let off the pedal. Something to consider.
Rattling sound that's driving me nuts
- Thread starter BigSur
- Start date
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If it has one, it is near the distributor vacuum advance unit, under a plastic cover, according to the maintenence manual. Adjustment is done as follows:
Align the setting line with the threaded end of the housing, and then align the center line with the setting mark on the housing.
Drive the truck at 16-22 mph in high gear on a level road.
Depress the pedal to the floor - a slight pinging should be heard, and go away as it the vehicle accelerates.
If the pinging is loud, or does not go away, retard the timing by turning the know towards the 'R'.
If there is no pinging at all, advance the timingby turning the knob towards the 'A'.
This is verbatim from the Chilton manual. Chilton may not be the best source, but who knows. This just may do the trick.
Align the setting line with the threaded end of the housing, and then align the center line with the setting mark on the housing.
Drive the truck at 16-22 mph in high gear on a level road.
Depress the pedal to the floor - a slight pinging should be heard, and go away as it the vehicle accelerates.
If the pinging is loud, or does not go away, retard the timing by turning the know towards the 'R'.
If there is no pinging at all, advance the timingby turning the knob towards the 'A'.
This is verbatim from the Chilton manual. Chilton may not be the best source, but who knows. This just may do the trick.
try this mate first is this noise only there while you are exelerating the throttle or once you get the revs up and keep them contant at a certain revs then is it only while driving or can you hear it while reving it in the engine bay .then take a long screw driver at least 350 to 400 long put the but to your ear and use the front as a stethascope all over the place on the vehcle where you can while wife or girfriend at the pedel, see what you come up with
60wag
SILVER Star
Do 62s have the funky idler pulley on the AC belt like the 60s? I've have the pulley make some odd noises since it spins intermittently.
edit: Another source of an odd rattling noise on 60s is when the rivots on the triple pulley harmonic balancer start to come loose. Eventually the front half of the pulley falls off and you loose two of the three accrwessory belts.
edit: Another source of an odd rattling noise on 60s is when the rivots on the triple pulley harmonic balancer start to come loose. Eventually the front half of the pulley falls off and you loose two of the three accrwessory belts.
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- Thread starter
- #68
OK...have and update. I went to toyota of richardson today and was ordering some parts and in talking with the parts guy he ended up going to the back and getting a master mechanic to come out and look at the 62. Well i drove him around and he took a listen and he couldn't figure it out. So we stop, i pop the hood and i pushed on the accelerator with my foot on the gas and he said "there's your problem, your pining". I can't tell a ping from a rattle at all. He told me to check all my erg stuff, VSV, etc. What's causing this is a octance problem (nice call Joshua). So that explains why i don't hear it as much in the winter cause they change gas in the warmer months and that is why i am starting to hear it again. So i am going to check all my octance effecting parts and go from there. I'll probably just buy new parts and be done with it. For it its good news cause its not my torque converter, main bearing or rod bears. It is something i need to address asap. I'll keep ya'll posted and thanks all for ya'lls help.
Wow - glad to hear it. I dont know if mine is still going to be making the ruckus when I get her out of the shop tomorrow - but at least suspicions are confirmed. Glad to be of some help - thats what forums are all about I guess!
- Thread starter
- #70
ok, so i ordered a new egr modulator and BVSV and installed those this morning and still got the pinging. Next is testing the EGR vavle. I tested the VSV and that is in good working order. I'll keep ya'll posted.
just a thought for once you have replaced your parts
alot of the old motors don't like reg 87 octane pump gas with the new up to 10% ethanol and thus pinging. i would try some super unl, its pricy but if the pinging goes away with super you might have to learn to live with it or dig into your wallet. there is alot of controversy about how things should run on reg pump gas ie if things are tuned right etc. etc. these motors were not designed on todays gas but if it works. thats all im saying. also try different brands there blends and additives are different and you might find that one brand does better. i think there are only three real sources of fuel but i have had vehicles that for no other good reason seem to like one brand over the other ie identical driving conditions, time of year, speed, weather, intown/hwy per tank, no changes in vehicle tuning and just simply better mpg.
alot of the old motors don't like reg 87 octane pump gas with the new up to 10% ethanol and thus pinging. i would try some super unl, its pricy but if the pinging goes away with super you might have to learn to live with it or dig into your wallet. there is alot of controversy about how things should run on reg pump gas ie if things are tuned right etc. etc. these motors were not designed on todays gas but if it works. thats all im saying. also try different brands there blends and additives are different and you might find that one brand does better. i think there are only three real sources of fuel but i have had vehicles that for no other good reason seem to like one brand over the other ie identical driving conditions, time of year, speed, weather, intown/hwy per tank, no changes in vehicle tuning and just simply better mpg.
- Thread starter
- #72
Well unfortunetly i has just put in a full tank of 87 octane gas about 4 days ago and i am at a half a tank now and once i am at the bottom i will put in some super unleaded. Could i put in some super unleaded now and mix half 87 and half super? Would that affect anything?
you will just split the difference octane wise but the mixes are truely not the same 87 is formulated a little different than 93 octane is just part of it. i would wait and just fill it up all the way. afriend o mine was going through the same issue in a 86 straight axle mini truck and found supper unl. made it run well, no pinging so when he can afford it thats what he puts in
hope it is as simple is that. the differnce in gas prices for a tank or two is likely less cost than starting to replace parts.
just my .02
Looks like 
jwest and 
kling-on win the guessing game
guess i should have been more specific with my answer as its what i was thinking at the time (more specifically octane knock or timing advanced too far.
)
jwest and kling-on win the guessing gameguess i should have been more specific with my answer as its what i was thinking at the time (more specifically octane knock or timing advanced too far.
)Ok. Got my rig back yesterday from the service shop in Limon, and drove it back to Wichita Kansas. No pinging or knocking! I spoke at length with the mechanic there. He said once they got the head gasket replaced and the engine fired up - it ran horrible - pinging and knocking like crazy. He found the timing was advanced to 20 or so. Holy Crap! The nominal for this engine is 7 before TDC. The theory is this; timing was out when I bought it, but not bad enough to make it obvious. when I got out on the highway and the engine was really having to work through the hills, the timing chain jumped - all the compression differences caused the head gasket to fail. Plausible. I had no problems with the engine on the way home - 486 miles later (and averaging 15 mpg!) still no pinging, or anything even remotely like what I was dealing with initially. So - IMHO, your problem (SUR) is most definately octane/timing related. Hope you get it sorted soon and dont have to deal with what I did!
