New 91 Celica All-Trac owner

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Re: New 91 Celica All-Trac owner

Postby nemo@nautilus.net » Sat Aug 15, 2015 5:34 pm

I pulled the wheel, opened up the drivers side fender plastic guards & chopped out the 'resonator box' connected to the air intake. This brought up the airflow into the filter box. Check those Turbo intake hoses - they turn to shit as the plastic/rubber ages, fractures & sucks unmeasured air - heat takes it's toll.

You'll do yourself another favor by whacking out the center exhaust resonator. 8)
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Last edited by nemo@nautilus.net on Sun Aug 16, 2015 10:10 pm, edited 1 time in total.
Twin ST185 Celica Turbo (winning) show chassis, completely overhauled. Red 1990 & White 1992 All-Tracs. :rofl:
See detailed photos in this site's Gallery: http://www.alltrac.net/phpBB2/gallery/album.php?album_id=241 :?
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Re: New 91 Celica All-Trac owner

Postby Rallly » Sun Aug 16, 2015 9:58 pm

Rallly wrote:
nemo@nautilus.net wrote:I highly recommend the BOSCH distributor rotor and cap, as they are 'Made in Japan' and higher quality that many others I've dealt with.

Also - check you Turbo intake hoses for brittle cracks. Air leaks will foul up your air/fuel calcs and create the sluggish conditions you are describing. These hoses are no longer made by Toyota, but I bought 2 silicone sets (red & black) out of Hong Kong. (eBay is your friend.) :rofl:



I will look into getting some new silicone hoses and couplers. Should the air filter box be air tight? I guess that doesn't really matter since the beginning pipe is open under the headlight?

Ya man, ever since I did an engine shampoo, it's been running like shit after startup for about 3-5mins.




I used an Oem cap and rotor, ngk wires, and oem iridium plugs. Smoother up high rpms but still have down low stumbling at startup, and that squeak rattling sound when I hit the throttle. Also I should mention I only got 330kms on a full tank of gas and smells very rich at idle. Very poor mpg in my opinion. I have eliminated that notion of the oem intercooler having a leak. All good there. Wish I could find that squeak rattle! I can hear but can see it lol. I wish a CEL would arise so I could check on the OBD scanner... I still think you on the right track with vac leak or bad cold start injector. Aside from that issue I still don't feel as though the turbo is kick on properly... At wide open throttle with a stock All-Trac, does feel like a secondary "punch" of power when the boost gauge begins to climb? I wish there was a way to do a boost leak test. Supra MKIV seems easier to work with haha.

Any Ideas's nemo?
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Re: New 91 Celica All-Trac owner

Postby nemo@nautilus.net » Sun Aug 16, 2015 10:26 pm

Pull the large turbo intake hose assembly and visually inspect it. Where it connects into turbo (curved area) is where heat & vibration break it.

Don't inspect vacuum hoses, replace them. They are cheap & a split hose will drive you crazy finding it.

Forget about the cold start injector.

*ANY* vacuum hose leak will kill engine performance - esp idle.

When that turbo kicks in, you should def feel it push you back in the seat. I get roughly 300 miles to a tank of 91 octane fuel. About 25-30 miles less in stop/go city traffic.

Take samples of your vac hose sizes into an auto parts shop & buy bulk to refit the whole engine. ASSUME (correctly) all rubber has rotted under the hood. And it has. Trust me, hindsight is 20/20. You should have a vac hose routing/connection diagram sticker under front right lip of hood. :bangshead:

It also wouldn't hurt to search eBay for Toyota service manuals for your chassis. There are 3 total. Sniff for best pricing, as service shops consider them obsolete after 25 years & no factory parts support. Don't pay extortion prices either. I scored a complete set for like $35-$45.

For turbo intake hoses, search eBay for 'Autobahn88 Silicone Intake Turbo Boost Hose Fit Celica GT-Four ST185'. These come in Red, Black & Blue from Hong Kong. eBay is your friend.

I also have recommendations for hi/low HID lighting & sealed beam glass lens conversion kits. Also some bad-ass JDM yellow HID fog light bulb replacements. Front blinkers and front sidelights got blazing amber 20 watt & 10 watt LED replacements, and clear lenses. Looks very very clean with zero bulb heat to damage new lenses.
Last edited by nemo@nautilus.net on Sun Aug 16, 2015 10:51 pm, edited 1 time in total.
Twin ST185 Celica Turbo (winning) show chassis, completely overhauled. Red 1990 & White 1992 All-Tracs. :rofl:
See detailed photos in this site's Gallery: http://www.alltrac.net/phpBB2/gallery/album.php?album_id=241 :?
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Re: New 91 Celica All-Trac owner

Postby Spectra1 » Sun Aug 16, 2015 10:43 pm

If his problem was just a vacume leak it woukd run rough all the time not just for a few minutes on start up.
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1990 Toyota Celica

Re: New 91 Celica All-Trac owner

Postby nemo@nautilus.net » Sun Aug 16, 2015 10:53 pm

Hoses REALLY affect idle when cold, then computer tries to adjust for leakage after warmup. If you can see very small cracks in the hose surface when stretched, junk 'em & replace.

See my add-on edit above.

There are several large vac hose conn behind engine manifold. Very tight squeeze between manifold and firewall. A real bitch to reach & work on. If you have one of those jacking with you, it'll be all sorts of crappy for running engine.
Twin ST185 Celica Turbo (winning) show chassis, completely overhauled. Red 1990 & White 1992 All-Tracs. :rofl:
See detailed photos in this site's Gallery: http://www.alltrac.net/phpBB2/gallery/album.php?album_id=241 :?
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