Turbo 4age tercel

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SirFoxx
Top Notch Member
Posts: 335
Joined: Sun Feb 05, 2017 5:42 pm
My tercel:: 1981 Toyota Tercel w/ 7age

Re: Turbo 4age tercel

Post by SirFoxx »

Paul wrote: Tue Jan 23, 2024 8:53 am Could these be early "low impedance" injectors? This article has an interesting section on injector outputs:
https://marstechnicalsolutions.com/blog ... ng-the-4-0
no. Im using high impedence rx8 injectors
1988 DLX 4wd Tercel Wagon w/ weber (RIP)
1985 4wd Tercel SR5 (RIP)
1986 Base 2dr Hatch (RIP / PARTS)
1986 DLX 4wd Tercel Wagon with ???
1985 DLX 2dr Tercel Hatch w/manual swap
1981 2dr Toyota Tercel w/7age (RIP)
1981 3dr hatch Toyota Tercel w/Turbo 4AGE
1981 3dr hatch Toyota Tercel SR-5
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Nordical25
Top Notch Member
Posts: 303
Joined: Tue Feb 08, 2022 11:49 pm
My tercel:: 2 4wd 1987's. One with 4a, other with 3a
Location: Finland

Re: Turbo 4age tercel

Post by Nordical25 »

SirFoxx wrote: Tue Jan 23, 2024 5:52 am
Mechanically the engine is okay (well, not really. theres a bunch of slop in the piston-to-cylinder due to the machine shop fucking up the bore -- not enough to cause piston slap, but more than there should be). I am still leaning towards this being an ecu issue, or a coil pack issue.

No, I dont have a spare 4age head. Compresssion is great across all 4 cylinders, so i highly doubt theres a head / block problem.
Ok, I see. Could you transfer this misfire into another cylinder by swapping parts in both injection + ignition? Theoretically that should be possible.
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SirFoxx
Top Notch Member
Posts: 335
Joined: Sun Feb 05, 2017 5:42 pm
My tercel:: 1981 Toyota Tercel w/ 7age

Re: Turbo 4age tercel

Post by SirFoxx »

Nordical25 wrote: Sun Jan 28, 2024 2:10 am
SirFoxx wrote: Tue Jan 23, 2024 5:52 am
Mechanically the engine is okay (well, not really. theres a bunch of slop in the piston-to-cylinder due to the machine shop fucking up the bore -- not enough to cause piston slap, but more than there should be). I am still leaning towards this being an ecu issue, or a coil pack issue.

No, I dont have a spare 4age head. Compresssion is great across all 4 cylinders, so i highly doubt theres a head / block problem.
Ok, I see. Could you transfer this misfire into another cylinder by swapping parts in both injection + ignition? Theoretically that should be possible.
ive already played the musical parts game, and the misfire remains. like i said, i cannot track what cylinder the misfire is on so i cannot see if moving parts causes the misfire to move.
1988 DLX 4wd Tercel Wagon w/ weber (RIP)
1985 4wd Tercel SR5 (RIP)
1986 Base 2dr Hatch (RIP / PARTS)
1986 DLX 4wd Tercel Wagon with ???
1985 DLX 2dr Tercel Hatch w/manual swap
1981 2dr Toyota Tercel w/7age (RIP)
1981 3dr hatch Toyota Tercel w/Turbo 4AGE
1981 3dr hatch Toyota Tercel SR-5
User avatar
Nordical25
Top Notch Member
Posts: 303
Joined: Tue Feb 08, 2022 11:49 pm
My tercel:: 2 4wd 1987's. One with 4a, other with 3a
Location: Finland

Re: Turbo 4age tercel

Post by Nordical25 »

SirFoxx wrote: Mon Jan 29, 2024 6:55 am
Nordical25 wrote: Sun Jan 28, 2024 2:10 am
SirFoxx wrote: Tue Jan 23, 2024 5:52 am
Mechanically the engine is okay (well, not really. theres a bunch of slop in the piston-to-cylinder due to the machine shop fucking up the bore -- not enough to cause piston slap, but more than there should be). I am still leaning towards this being an ecu issue, or a coil pack issue.

No, I dont have a spare 4age head. Compresssion is great across all 4 cylinders, so i highly doubt theres a head / block problem.
Ok, I see. Could you transfer this misfire into another cylinder by swapping parts in both injection + ignition? Theoretically that should be possible.
ive already played the musical parts game, and the misfire remains. like i said, i cannot track what cylinder the misfire is on so i cannot see if moving parts causes the misfire to move.
Oh, I see. Then maybe you could get some help from AE86 or MR2 forums. I think that these guys especially AE86 guys should know injection + 4AGE pretty well.
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SirFoxx
Top Notch Member
Posts: 335
Joined: Sun Feb 05, 2017 5:42 pm
My tercel:: 1981 Toyota Tercel w/ 7age

Re: Turbo 4age tercel

Post by SirFoxx »

Well, good news. I choked down the price of new, quality hitachi coil packs, and i think that fixed my misfire. I've been driving it the last few days with the old packs, and once it warmed up the engine would not misfire. However, with the hitachi coils, there are no more misfires, even when dead cold! I will continue to drive it, see how she does.

Next steps for the car will be adding a catch can, and modifying the valve covers for larger breathers. The factory breather is waaaaaay too tiny for the engine, especially when there is blow by. Also still need to get an air filter for it...
1988 DLX 4wd Tercel Wagon w/ weber (RIP)
1985 4wd Tercel SR5 (RIP)
1986 Base 2dr Hatch (RIP / PARTS)
1986 DLX 4wd Tercel Wagon with ???
1985 DLX 2dr Tercel Hatch w/manual swap
1981 2dr Toyota Tercel w/7age (RIP)
1981 3dr hatch Toyota Tercel w/Turbo 4AGE
1981 3dr hatch Toyota Tercel SR-5
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