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When cold, the engine would start normally and idle normally, but upon pressing the accelerator there was no pulling power, until the engine had warmed up.

It felt as if the EFI was leaning out massively as soon as one pressed the accelerator.

Over time, the symptoms then became worse, even to the point that the idle was affected. Cold start was normal, but then after some 30 seconds the engine would die (just as soon as the cold enrichment period was over). A re-start would always work though.

I suspected the Mass-Air-Flow sensor but couldn't find anything obviously wrong.

The other likely suspect was the air duct leading up to the inlet-manifold plenum. Superficially, I could not see any obvious air leaks, but upon close inspection I noticed that the rubber collar-seal that is fitted inside the duct (at the plenum end) was brittle with age and starting to crack.

1.Perishedrubbercollarinair-duct.thumb.jpg.fc14087d9185cdf91225744975385bc5.jpg

2.Collarclose-up.thumb.JPG.e210e05c90e39609444db142c86f19b5.JPG

This seal is no longer available from Toyota, but it dawned on me that a short length of rubber hose could be used as a substitute.

 

I did this, and that solved the problem completely, and cold performance was back to normal.

 

Repair details are as follows:-

GATES 2-1/4" ID SILICONE TURBO HOSE   Code: GAT26136     (with a wall thickness of ≈4mm).

This is sold online by the centimeter, and 4cm is all that is needed.

3.Onlyneed4cm.thumb.jpg.a6afc5983eea8e7bff3061dc266f566d.jpg

 

To buy online, the link is:-

https://www.maxiparts.com.au/GAT24836-hose-silicone-2-1-4-and-quot?SearchID=2828731&SearchPos=2

Do tell them in the comments box that you only want 4cm, or else they'll think it's a typo.
Also insist on Gates with 4mm wall thickness, not the Tyco brand with the thinner wall of only 2.7mm).


It will be a very tight fit on the plenum-pipe, but by cutting some gentle scallops into one end of the silicone hose, and applying a smear of rubber grease, you will be able to get it to slide onto the plenum-pipe. [The scallops will act as expandable guide-fingers to get the hose started, and then the rest will follow fairly easily.]

4.Scallopedend.thumb.jpg.f18060f3b60fa3e0538c3d8ebf36ce6b.jpg

5.Hoseonplenum-pipe.thumb.jpg.de21c2c57582629664af1ea49cc5e0b2.jpg

 

The OEM air duct (minus its original internal collar-seal) will now be a snug fit, and a Tridon hose-clamp (52-76 mm) nicely finishes the job.

N.B. Whenever removing the air-duct for servicing, the silicone hose should remain on the plenum-pipe.

6.Re-fitAir-duct.thumb.jpg.a1422b59f04fd83d6b3c29e25c8986ef.jpg


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