22R pinging and dieseling? - Toyota Nation Forum : Toyota Car and Truck Forums
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post #1 of 4 Old 05-24-2019, 07:11 AM Thread Starter
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1992 22R
370,000KM’s

Hi guys.

Owned my 22R (great engine, love it) for 2 years and the pinging has gradually gotten worse.

No pinging when I purchased the car. 6 months later I noticed it. It started off very very minor in 5th gear under load at roughly 2-2.5k RPM, but now it essentially does it under load in any gear at any RPM under 2k and it is quite bad, I’m afraid to put my foot down. The car also has started to occasionally diesel when shut off for a cough or two.

I’ve checked the timing, 5 degrees when plugged, and 12 when normal. I’ve even retarded it back to 0 degrees which is apparently the factory standard. It did fix the ping, but was very underpowered and hesitated when under load. I’ve since reverted it back to 5 degrees. It’s a nice amount of power at that.

91 octane in my country is the minimum and cheapest grade you can buy so I run it on that. 95 and 98 which are the only two other options stops the pinging but are far too expensive to justify running the car on all the time.

I’ve replaced the distributor, dizzy rotor, spark plugs and leads about 6 months after purchasing the car It ran like a champ when I did so!

My next step is the PCV valve (waiting on parts to arrive from Toyota) and giving the carb a clean with spray (possibly hot spots?). Will soon be replacing the timing chain too as for high mileage. Also I’m not sure any of that will sort it.

Any recommendations from here? Thanks.

Last edited by Tyz987; 05-24-2019 at 01:40 PM. Reason: Typo
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post #2 of 4 Old 05-24-2019, 12:42 PM
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I would pull the plugs and send an endoscope down into the cylinders to see how badly they are carboned up.

You could use some water to decarbonize the combustion chambers. I used a 2 liter plastic soda bottle as my dispenser. I eventually went with one of those personal misting sprayers.

Here's my thread on how I did it. You might want to pull the catalytic converter (if you have one) just so it doesn't git all that gunk stuck into the converter.
https://www.toyotanation.com/forum/6...my-engine.html

1998 T-100 SR5 2WD auto, Roadmaster Active suspension, dual oil catch jars, AC mod, aero cap, lower aero package, 67% grill block, aero single wheel trailer
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post #3 of 4 Old 05-24-2019, 02:56 PM Thread Starter
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Originally Posted by BamZipPow View Post
I would pull the plugs and send an endoscope down into the cylinders to see how badly they are carboned up. <img src="https://www.toyotanation.com/forum/images/smilies/wink.gif" border="0" alt="" title="Wink" class="inlineimg" />

You could use some water to decarbonize the combustion chambers. I used a 2 liter plastic soda bottle as my dispenser. I eventually went with one of those personal misting sprayers. <img src="https://www.toyotanation.com/forum/images/smilies/wink.gif" border="0" alt="" title="Wink" class="inlineimg" />

Here's my thread on how I did it. You might want to pull the catalytic converter (if you have one) just so it doesn't git all that gunk stuck into the converter. <img src="https://www.toyotanation.com/forum/images/smilies/wink.gif" border="0" alt="" title="Wink" class="inlineimg" />
https://www.toyotanation.com/forum/6...my-engine.html
Hi thanks for replying. I’ve got an hour or so before I need to head to work so I hope I’ll get a quick enough reply as I see you’re online!

Can you tell me if this is the correct outlet to do your procedure from? It says “to carb” on it but when I take it off, plugged or not, RPM doesn’t change. I also don’t want to put water in there if it’s not the correct place. Cheers.
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post #4 of 4 Old 05-28-2019, 10:47 PM
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Since yer carbureted, I would just spray it directly down the throat of the carb since the throttle plate will be open when you've got it at 2500 rpms.

1998 T-100 SR5 2WD auto, Roadmaster Active suspension, dual oil catch jars, AC mod, aero cap, lower aero package, 67% grill block, aero single wheel trailer
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