Engine knock

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Whoa Nelly, Lighten up Frances, Easy there Cobra!
I just read this twice to see where Doug was being a d%#@. I must say, I don't see it. All I see is you going off.
#1 Doug was merely stating the obvious in his first post, NEED MORE INFO, which you have NOW provided.
#2 the loose change thing is no BS, been there, could have sworn it was engine noise at first.

Couple of things, I agree with MTNRAT, OEM on the wires and plugs. And Wilesy has a good piont about fuel. If you are using cheap gas then try something better, or bump up to the PLUS stuff. If that doesn't help at least it will eliminate that as the source. You have to put gas in anyway so it can't hurt.
Hope you find the problem
 
dryfly said:
It's a pinging noise that happens under light acceleration. I upgraded the wires to NGK's and the plugs to iridium NGK's.
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That is NO upgrade. And by the way you DID NOT state "ping" in your earlier post. You cleary stated "knock".



Back off while you still have a chance.

Your original explanation of your problem SUCKED.


You sir are the Smart Ass here.
 
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If none of you can read idaodoug's smartass reamarks......his first response and his second for that matter----loose change imbetween my shifter boot, and don't see that he is being a dick....than your blind. That wasn't a quick jab at the newbie, it was lip. I appreciate those who were doing what I've seen before....offering suggestions, or if you need more info than ask, not berate the poster. BTW I don't care if he stared this board, I'm not going to curl up in the corner when I ask for help and get this kind of BS in return.
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Ok, I read it. Didnt see any smart ass remarks from IdahoD, just some q's to get more info from you. And to me they seemed resonable to ask. The change thing, you never know it could happen. Myself being a technician for Lexus you see a lot of odd stuff happen, so like IdahoD was trying to acomplish he just wanted more info!

You sir are the Smart Ass here.
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I think CruiserDan is right here. Your the one that asked for help, lighten up and listen to what people are saying, you might be able to fix the problem that way.
 
Nobody thinks this doesn't sound like a smartass......? "Instead of a BTT shouldn't we institute a BTB for such a dearth??" That does not sound like "We need some more info."

Next I read "Do you need to be spoon fed every suggestion?" Once again, smartass.......And I haven't even REPLIED yet.

How can you guys read that and not "see" any smartass remarks, regardless of who said it. Either your not reading everything or you don't care.
 
Dry,

Unless your knock (now ping) has disappeared while I was repacking my bearings, you still need some advice. There are a lot of good people here who'd like to help you, and so would I. What say we move on from what's becoming a pointless pissing match and see if together the forum can provide you with some help on your ping.

DougM
 
Finally, a decent suggetion. Well, too start anew....as previously stated:

It is......
1997 FZJ80 with 91k miles
new NGK iriduim plugs and ngk wires about 3 or4 months ago
The problem just started, ie.....it happened well after the new plugs and wires
The ENGINE IS pinging, it is not an exhaust hanger or loose change.
It does this under light acceleration or from a stop.

Further...the cleaner's I have tried have been two cans of Sea Foam and Red Line.
It might be my imagination, but it seem's to be worse when the engine is at operating temp....doesnt seem to happen when the engine is cold. Any more questions......JUST ASK.
 
Since the problem developed after plugs and wires (not immediately though), it could be carbon buildup as a result of the new plugs/wires and poor/incomplete combustion, and this might be further supported since you say it happens more when the engine is warmed up. As stated earlier, the OEM are as good as they get. I tried non-OEM at one point and didn't like the results so went back and things did improve. Might also consider OEM dist cap and rotor--the aftermarket ones are crap IMO.

As for the carbon, I don't know if Seafoam will help with this--maybe it depends on how you add it (intake or gas). 3M makes a decarbonizer I've used as PM and I'm sure there are others too. I also agree that trying a higher octane fuel may improve things. Check timing too--be sure to jump the diagnostic port when checking.
 
You did not mention the baseline timing. Have you checked that? It should be 3 degrees BTDC with the data link connector shorted. If it is advanced that could be your problem. Either that or you may possibly have a lean condition.
 
I am interested in this thread (not for the pissing match) since i have a very similar problem. I have put new Iridium plugs, OEM: plug wires, rotor and cap along with M1 oil change and cleaned the K&N (which will soon go the way of the trash). I do not have a timing light to check my timing. I also run 93 octane fuel here in NC. I really noticed it the other day when pulling out my buddies stuck cheep, when riding slowly down the trail, any time the engine would be in low RPM range and lugging so to speak it would start pinging. With RPMs up it was fine.

also noticed when exiting the trail there seems to be a flat spot in the low rpm range. Only thing i could figure is it's the knock sensor retarding the timing because of the pinging as the truck seems to fall on it's face off the line.
 
That sounds like too much spark lead.
 
Timing too far advanced.........Sorry, been in the car business too long and the slang spills out sometimes...... :doh:
 
concretejungle said:
I am interested in this thread (not for the pissing match) since i have a very similar problem.
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Me too. Pinging when light on the throttle, just started about 1 month ago.
Guess I should check the timing this weekend too.

wd
 
I have checked the timing yet, but I always run high octane gas. I use to have an 85 4runner that did this too. I replaced the headgasket on it, but while I was in there I scrapped all the piston heads free of carbon. Problem was gone when I buttoned it back up.

Assuming it's not the timing, can it be decarbonized without taking the head off?
 
Gentlemen,
Seems we all have it. :cheers:
Concrete I have a timing light you are welcome to borrow.
I obviously have not used it. :frown:
Dry - as for gas, high grade is just wasting you money. :D
I used to do that also.
I now use regular and after the system adjusted it is no worse maybe even better.
Someone here also suggested using a plugs one setting cooler to help with predetonation.
I have never done this but it sounds good.
As for me, when I get around to it, I will replace the dist cap and rotor, plug wires and plugs with OEM.
Oh and it will get worse as it gets hot out.
:flipoff2: Later ladies,
 
concretejungle said:
I'm waiting for others to tune in, but i think several here had really good results with Redline cleaners.
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Well, I've brought this topic up on several ocassions over the last year to year and a half here, as I've been living with an intermittent pinging ever since I bought the rig.

I've done Redline, cleaned MAF, cleaned throttle body, new VSV for EGR, new modulator, new plugs, un-advanced timing amongst some other things. It's better but I still get it from time to time. Seems like big fluctuations in outside air temp bring it back. I get the feeling the on board computer has this thing living right on the edge, so if I get the right ambient conditions (probably along with some carbon build-up here and there in the wrong places), I gets pinging.


There's your answer. Now l for one... want to hear some more pissing match... and some cowbell :popcorn: :flipoff2:

:beer:
Rookie2
 
if i am not mistaken, all of the trucks who have posted with pinging symptoms on this thread are 1995-97, heavy on the 97s.

Interestingly, all of the trucks posting with overheating symptoms shutting down the AC on steep hills in dusty's thread are 95-97s as well.
https://forum.ih8mud.com/showthread.php?t=48301&page=2&pp=30

Could we be seeing something to do with the wire air flow management and the super smart later ecu here causing or not recognizing a lean condition making them run lean (and hotter)? Christo has mentioned it before to explain why the 97s in particular seem to blow h/g's more than any other year. Certainly, Landtank's mileage tells me the 95-97s are stingier with the fuel than my 93 :rolleyes:. Anyone with a 93 or 94 have any pinging? I am sure there are plenty of carboned up 93-94s out there including mine and we have had longer to get that way and less sophisticated fuel management to deal with it.

Anyway, just thinking out loud. I probably missed a 93 or 94 there so don't all pile on.

Also, still thinking out loud, don't the 95-97's have only a single o2 sensor in front of the cat managing airflow? Could an o2 sensor performing below par but not failing cause this? Seems less likely to happen with the dual sensors on the 93-94 averaging out the signal.
 
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