Toyota 4A-FE emissions problem. (1997 1.6 corolla)

[Huwbertus]

Just had an MOT done and has emmisions results as follows and am hoping somebody will be able to help me on here as am a little worried at teh results produced by the engine. Originally the car failed with a fast idle result of 0.5% (limit 0.3%)

Fast idle test
CO @0.2% (limit 0.3%)
HC @58ppm (Limit 200ppm)
Lambda @1.0 (Limit 1.03)

Natural idle test
CO @0.49 (limit 0.5)

Has only done just over 88000 and CO and Lambda are very high. Any ideas? Am I looking at adjustment, dodgy sensors, or an engine on the way out? Any help would be much appreciated.

Cheers
Huw

[That Daddy]

No1 suspect on one of these engines will be the Lambda probe(good chance its original)dont fit a cheap universal get an OE quality one from NGK/NTK from someone like http://www.scmf.co.uk/home.asp get your one tested 1st though because its expensive if diagnosed incorrectly but it certainly looks to be the case judging by those results.

[Huwbertus]

Cheers. Was thinking along the same lines. Been to main dealer and said nothing wrong I must be making it up.

Car has been running a bit rough. Erattic engine speed under light load (1st gear RPM would fluctuate by 500 without moving throttle on a flat road. Would idle steady.) and poor fuel consumption. Poor emissions at another garage stated the finger pointing.

Lambda sensor in the region of £100 from Toyota though. Is it a DIY job? I haven't even looked under the bonnet yet to find it for myself though.

Regards

[Deltaf01]

4AFE engine will likely have the expensive 02 sensor and you absolutely cannot replace it with the universal type as the signal outputs are not alike.

Cheapest place i got one from was Partco- blue print part but genuine Nippon Denso/ Toyota branded sensor in the box.
Blue Print Part number was: ADT 37002.
ND/Toyota part number was: 89463-20070.

Over £300 from toyota but *just* eek , £267 from Partco.

http://www.blueprint-adl.com

[Huwbertus]

Hoe do I tell the differance?

[Deltaf01]

Have a look on the O2 sensor body and get the part number off it is the easiest, or take the chassis number in to a toyota dealers and theyll tell you what its got.