Emissions Tester

I have one of the Gunsons 'professional' emissions testers I have been thinking of selling for a while now (only got one petrol vehicle left, and that's got EFI so takes care of it's self :)

The tester I have is the top dogs bollx model.. from gunsons, it's an emissions tester, and engine diagnostics machine, it's the green shoe box sized tester (they do smaller one that's got less features etc.. used to be the yella one)

Mines got a digital display, and as well as emissions does RPM, Dwell angle, and voltage.. from 2 to 12 volts, i've extended the tube on the probe on mine.. and put a 12 volt power supply on it so it used to sit just inside the garage door, and I could drive any vehicle in, turn the power supply on and shove the probe up the exhaust, (standard you have to connect it to the cars battery, a pain when you want to quickly test 4 cars emissions and not plan to adjust them.. as each time you disconnect the power, you have to wait for the unit to warm up again and calibrate it (just a knob to turn to calibrate)

There's a long wire for the connection you make to the ignition coil to use the tester to set the dwell angle, measure rpms and all that,

I'll have the instruction book about somewhere, but I can't guarantee I have it handy.. I can print out how to use it if wanted.. it's pretty easy, i prolly have the box for it somewhere in the garage too (mind, im my garage the holy grail could be in there, but can i find the bugger :)

Anyway, if you goto

half way down the page, the "Gastester Professional, reference#4121"is the one I have.

Anyway, make me an offer if you like,

Gary AT Kampenwagen DOT co DOT uk is my e-mail addy, replage the obviouse.

I got the cheaper one (also green now) cost me £60 I think. It has a digital readout and used along side a Gunsons colour tune I've no need for the extra bits and bobs. I also use a rev counter but have it so I can fit it to whatever I'm working on rather than as part of the above kit.

I also use a pipe for balancing carbs but one day hope to have a proper balancer.

Lee D

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Just a little hobby site about Landies :-) ________________________________

oh yeah, i also have 2 colour tunes, somewhere i have the gunsons carb balancer.. biggest POS i ever spent a tenner on, i got a proper german made carb balancer.. moving vane type thing, looks like a snail ,very good and accurate, cost about 60 euro's at a VW show, timing light, compression tester and so on, all will be surpluss to requirments as diesels have no use for any of this (just a DTI and the adaptor is all i need :)

guess i'll bung the lot on ebay over the next few days then, prolly do a job lot, just thought i'd offer them on here for a 'reasonable' ofer first.

On or around Sat, 3 Jan 2004 14:57:17 +0000 (UTC), "CampinGazz" enlightened us thusly:

not wishing to pour cold water... I've got the next model down, and while it's OK for basic idle settings of CO, (and obviously, in the case of your one, for dwell angle and stuff) so far as I can tell the CO metering is the same as the one I have, and it's not good enough for proper tuning of an LPG system.

Works fine for petrol things on carbs before the MOT mind, which can save a silly failure.

Just thought I'd say. I got mine hoping I could use it for tuning the LPG system, and it won't really.

On or around Sat, 3 Jan 2004 18:16:00 +0000 (UTC), "CampinGazz" enlightened us thusly:

what sort of timing light?

What's the thoughts on taking a circuit like the one given here as a lambda sensor tester:

and hooking it up to a lambda sensor from a scrappie, and using that as an emissions tester (fixed at either extreme = too low or too rich, oscillating or central = OK)?

AndyC

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+-------------------------------------------------------------------------+ |Andy Cunningham aka AndyC the WB | andy -at- cunningham.me.uk | +-------------------------------------------------------------------------+ | - Everything you wanted to know || about the P38A Range Rover but were afraid to ask. |+-------------------------------------------------------------------------+"And everything we want to get/We download from the InternetAll we hear is/Internet Ga-Ga/Cyberspace Goo-goo" -- from "Radio Ga Ga"/"We will rock you"

Thanks, checking and adjusting the gas-powered Discovery is one of the main reasons I wanted one.

Cheers Gary

What do you need to fiddle with LPG systems then?

On or around Sun, 04 Jan 2004 12:28:12 +0000, Paul Everett enlightened us thusly:

IME, a better analyser. I take mine up to the local garage, and get it put on the crypton thing.

some LPG stuff requires a suitable laptop and stuff, these being the electronic controlled types.

but the ordinary one requires setting at high(ish) revs, and I've not found the small gastester things to be able to do that.

works fine at idle speeds.

i'll admit i've never used mine on a lpg'd vehicle,

but i have used it at high speeds, when i first fitted the twin carbs to a beach buggy i had, they were way out of whack on the jets, and the local carb specialist wanted 200 for a half day on the dyno to sort it out,

i put the gas tester in the passengers seat, angled to i could see the display while driving, connected to the battery.. no probs as it's behind the drivers seat, stuck the probe up one of the exhaust pipes, and wired it in.. mainly to keep the rubber tube to the co tester from being in the hot gas stream, the tube i have on my tester is about 10 foot long, so that was easy to do,

i then waited the 5 or 10 minutes for the machine to settle down and be calibrated to the 2% co level (that's how you calibrate these.. each time it's turned on) and went for a drive,

i soon found i was leaning out massively at about 2400 rpm, then richening up a lot over 2700 rpm, (while at idle i had a normal CO setting of around

1.2% (32 year old engine here)

stoped, changed the probe to the other pipe (twin exhausts, totaly seperate for each cylinder bank) and drove the same route again, this time the carb leaned out even further than the first one, but still at around 2400 rpm,

i went to the carb specialist and told him what's i'd found out, and he sold me a set of jets to try, tried them, and went back with the new figures, anotehr set of jets tried again, and i had the best fueling i'd get by setting her up like that,

i wanst interested in power output, just that she didnt lean out at speed, air-cooled engine and all that, that's a very bad thing to happen.

i'll admit that i never used the co tester to do high speed while sat in the garage, having open exhausts and the garage door pointing to a house accross the road kinda ment i couldent run her for that long before he came over and threatened to wrap a pic axe handle round my head :)

On or around Mon, 5 Jan 2004 13:36:06 +0000 (UTC), "CampinGazz" enlightened us thusly:

I think the pump works by using exhaust pulses, and probably it depends on the engine and the exhaust system. You can hear it operating, and it works better at some speeds than others, and probably it depends on frequency.

variable results, anyway. worked well enough for idle as I said. The LPG systems are typically set at about 3000 rpm, and for some systems you require something that gives accurate readings down to about 0.1% or 0.2%, which the gastester didn't - they quote 0.5% accuracy, ISTR.