Club 80-90 Forums

Are there any inexpensive gas emission testers out there?
I've searched my cod off but can't find any thing under a ton.

I only want a CO tester
and was wondering if a domestic tester would work.

I have a gunson gastester (halfrauds were the cheapest at the time...)
It works very well... but needs a long warm up and after use time... so handy to have a good spare battery to connect it to whilst buggering about with the vehicle you are working on...
It also needs to be placed in a stable position and NOT moved while stabilising and using... as it upsets the "calibration"... little technique to help it clear quicker are to "puff" down the tube to clear "dirty gasses"... and not leaving up the tailpipe for too long either....

On the whole, it does the job for sensible money, just need a little patience and care...

Yes simon I looked at the gunson.
I was wondering if there were any other gas testers.. worth looking at

and could you use a domestic tester that measures CO in the air?

CO meters are a load of cobblers in my opinion, you only get a 1/4 of the picture.
To accuratley set an engine up you need to be seeing what ALL the gasses are doing, not just one.

CO2 is a good indicator of engine condition.
CO is just a by product.
HC can also tell you a lot about engine condition, but also tells you about the timing being out or any air leaks.
O2 says a lot about the efficiency of your engine, any holes in the exhaust, or poor combustion.

lambda is the most useful, or AFR as it used to be called

Thing is with CO, you can have it reading right, but all the others can be well on the pi$$, you need to see everything to understand whats going on.
Find a friendly garage and see if they will get you a print out, better dropping them a fiver rather than wasting money on a machine that basically tells you knob all.

I agree Si it aint the total solution, but it can be a useful aid in final setup...

I had a great chap round the corner from me in IoM...
But nearest "understanding" garage to me in France was 23 miles away......... all the others just said "go to VW".........

What I am gonna do is something like one of these:-



http://www.demon-tweeks.co.uk/products/ ... =STAST3401" onclick="window.open(this.href);return false;

This is a cheaper one for about a ton, but the advantage with both is that as you drive you can see what the engine is doing. More accurate than setting up at tick over.


http://www.demon-tweeks.co.uk/products/ ... R/PDTM4007" onclick="window.open(this.href);return false;

Tinley Tech do a lpg conversion with a stepper motor controlled by a lambda probe for tuning the lpg system.

The gauges are the same price as workshop ones, and just require a nut welding into the exhaust system for the lambda probe. Great for diagnosis, and fine tuning with the AFM or lpg set up, and what peace of mind.

You will need a wideband lambda sensor for these too.. another £75+..
I have a similar (more basic) item fitted to my caravelle...

The stack gauge comes with one. And the nut for welding.

Thats a pretty good price then... £185

thats how the company who inspected my LPG system set it up, after the intial setting up he fixed the probe into the exhaust and had the display unit on the dash, drove it several miles tweaking it on sevral occaisions untill he was staisfied that the mixture was correct over a range of driving conditions. Useful peice of kit and interesting thread!

syncrosimon wrote:What I am gonna do is something like one of these:-



http://www.demon-tweeks.co.uk/products/ ... =STAST3401" onclick="window.open(this.href);return false;

This is a cheaper one for about a ton, but the advantage with both is that as you drive you can see what the engine is doing. More accurate than setting up at tick over.


http://www.demon-tweeks.co.uk/products/ ... R/PDTM4007" onclick="window.open(this.href);return false;

Tinley Tech do a lpg conversion with a stepper motor controlled by a lambda probe for tuning the lpg system.

The gauges are the same price as workshop ones, and just require a nut welding into the exhaust system for the lambda probe. Great for diagnosis, and fine tuning with the AFM or lpg set up, and what peace of mind.

some nice gear there Simon... thanks