Some pinging, some dieseling

Mosquito · Post by **Mosquito** » Mon Nov 28, 2005 9:19 am

Okay, so the new Tercel (87 w/ 113k) is getting just a little pinging under load, and diesels about every fourth time I shut off (not a lot, just an extra "cough"). It's got a carb, not fuel injection. What's the common wisdom say:

(1) Timing is too far advanced.

(2) Carbon on the pistons.

(3) Both.

(4) Neither, or others.

I'm going to do a tuneup myself, but if y'all think it's carbon, I want to do the old hot rodder trick, running some water/ATF fluid through the carb before I swap the plugs, PCV valve, etc.

Typrus · Post by **Typrus** » Mon Nov 28, 2005 11:53 am

I'd give a good cleaning a shot. You could try yours, my, or Takza's method. Both Takza and my own are in the repair section. Mine is the Seafoam treatment, Takza's is the decarboning process.

Mosquito · Post by **Mosquito** » Mon Nov 28, 2005 1:43 pm

Typrus wrote:I'd give a good cleaning a shot. You could try yours, my, or Takza's method. Both Takza and my own are in the repair section. Mine is the Seafoam treatment, Takza's is the decarboning process.

I'm going to try a combination of the two. First, I'm going to spray Chemtool into the carb (not so sure about plugging the vents with my finger, though--just need it to backfire through the carb once and you'll never do that again!), then I'm going to do the slow drip of water/ATF through the passenger side of the carb. If that doesn't do enough, I'll try some seafoam in the tank, but I haven't been able to find a local source for it.

After that, a tuneup.

Typrus · Post by **Typrus** » Mon Nov 28, 2005 7:10 pm

Napa was the first place I found it. Now all local auto shops have the stuff.
You don't spray it down the vent tube while running. You do it with the engine off. Then you allow it to sit for a long period of time.

Mosquito · Post by **Mosquito** » Mon Nov 28, 2005 7:56 pm

LOL, sorry, I misread!

Gasoline Fumes · Post by **Gasoline Fumes** » Mon Nov 28, 2005 11:22 pm

Make sure you have good spark plugs. I'd use NGKs in a 6 or maybe even 7 heat range. Avoid Bosch.

Post by **ARCHINSTL** » Tue Nov 29, 2005 1:08 am

I would have to agree about the NGK brand. I was using Bosch, and just last week switched to the NGK "stock" plugs, BPR5EY-11 (all that the local Advance stores carry in stock), and actually noticed a difference in smoother running. I had been skeptical, but am now a believer. I presume that the hotter plugs would give even better results in our high-mileage motors.
Tom M.

Mosquito · Post by **Mosquito** » Tue Nov 29, 2005 8:20 am

Are NGKs stock plugs? Not Nippon Denso? I was just going to go with what Mr. Toyoda intended. . . . Any real reason not to?

Typrus · Post by **Typrus** » Tue Nov 29, 2005 12:25 pm

I think NGK wasn't around when our cars came out?
They are both good, and both will chew on Bosch, Champion, or the others, but I think NGK is a slight above. The NGK and Denso Iridium plugs are supposed to be wonderful.

Post by **ARCHINSTL** » Tue Nov 29, 2005 12:41 pm

Both NGK and Denso are in the Owner's Manual.
Specifically, for all Cali and Canada w/AT :
_____NGK BPR5EY11
_____Denso W16EXR-U11
And for USA/non-Cali and Canada w/MT :
_____NGK BPR5EY11 or BPR4EY
_____Denso W16EXR-U11 or W14EXR-U11

It does not explain the difference, or when to use the cooler plug (or a hotter one either, for that matter).
Tom M.

Gasoline Fumes · Post by **Gasoline Fumes** » Tue Nov 29, 2005 8:24 pm

Typrus wrote:I think NGK wasn't around when our cars came out?

NGK Spark Plugs (USA), Inc. was established in 1966 as a subsidiary of NGK Spark Plug Co, Ltd., of Japan. And they started in 1936 in Japan. I know these Tercels are old, but....

Gasoline Fumes · Post by **Gasoline Fumes** » Tue Nov 29, 2005 8:31 pm

ARCHINSTL wrote:Both NGK and Denso are in the Owner's Manual.
Specifically, for all Cali and Canada w/AT :
_____NGK BPR5EY11
_____Denso W16EXR-U11
And for USA/non-Cali and Canada w/MT :
_____NGK BPR5EY11 or BPR4EY
_____Denso W16EXR-U11 or W14EXR-U11

It does not explain the difference, or when to use the cooler plug (or a hotter one either, for that matter).
Tom M.

The "5" is colder than the "4." I don't know much about Denso's part numbers.
NGK part numbers:
http://www.ngksparkplugs.com/techinfo/s ... berkey.pdf