Mazda Rotary Club

General => General Technical => Topic started by: 666FLO on April 30, 2009, 04:10:59 PM

Title: MOT fail-help
Post by: 666FLO on April 30, 2009, 04:10:59 PM
My rx7 failed badly on the emissions.. will post up results later.. anyone got any help on how to get them sorted ? :(
Title: MOT fail-help
Post by: Bobbit on April 30, 2009, 04:30:48 PM
you got a cat fitted? And what model have you got bud?
Title: MOT fail-help
Post by: 666FLO on April 30, 2009, 04:47:04 PM
I have a 93 rx7  the results off the sheet are

co allowed 0.3000 actual 8.686
 ppm limit 200 actual 619
 lambda min 0.97 max 1.6 actual 0.776

:lol: I dunno if it has or not. will have to check with the other half
Title: MOT fail-help
Post by: BlitzBoy on April 30, 2009, 05:12:44 PM
running rich on the old lamda,is the air pump still on?
Title: MOT fail-help
Post by: johnm on April 30, 2009, 06:52:48 PM
take a look at my post from last week - search under my user name
Title: MOT fail-help
Post by: 666FLO on April 30, 2009, 10:03:04 PM
well after checking out last mot details and this mot details it seems they have used a different test from the last time.  On this test it says it has a CAT but the last MOT test it says its a NON CAT ? On the pervious test the MAXlimits are different? have the laws changed since 07?

CO max level on the old mot was 3.15 were as this time the co level max was 0.300. The HC max level on the old one was 1200 and this time it was only 200?

does that make sense? does that mean i could maybe take it back and dispute test they did? as it would have had more chance off passing if they had done it like the last time..

ps the old test was done at wgt but unfortunetly i can\'t get there at the moment to get it done so used a local garage. grrr.

Hey John were abouts are you in aberdeen? I\'m outside going towards ellon... seems there is a few more rx7 kicking about now. how long have you had yours? Will have a read of your posts thanks :)
Title: MOT fail-help
Post by: johnm on April 30, 2009, 10:10:39 PM
I am in Westhill.

There are few post that explain the rules on emissions testing, the rules are slightly different for UK models and imports, imports not due a CAT test until late 95
Title: MOT fail-help
Post by: 666FLO on April 30, 2009, 10:15:31 PM
mine is an import. so I can go back and say please test it again without a CAT & all that other harsh limits they have test it by?
Title: MOT fail-help
Post by: 666FLO on April 30, 2009, 10:22:27 PM
whats the spec of your car john? I see you had a few problems with getting an MOT too? is yours a uk or import?

will have a look at some of the stuff you did on my car and see if that helps it any.
Title: MOT fail-help
Post by: logicalChimp on April 30, 2009, 11:41:03 PM
Hmmm

It does sound like it has been tested under the wrong rules - if it is a \'93 and an import, it should use the pre-cat limits (this applies to all imports pre \'95, iirc)

I should ring the MoT centre up and tell them they ran the wrong test - you may be able to get them to redo the test... won\'t hurt to ask, anyway :D
Title: MOT fail-help
Post by: rxangus on May 01, 2009, 08:01:28 AM
Here\'s what I found the regs were albeit 5 years ago!

http://www.mazdarotaryclub.com/forums/showthread.php?s=&threadid=6272

I use Farburn Motors in Dyce. They don\'t do a fast idle test I\'m guessing because they can\'t find the plug leads! Mine\'s a 96 and gets through every time. Had mine 6 years

Angus
Title: MOT fail-help
Post by: BlitzBoy on May 01, 2009, 09:14:35 AM
yep if its an import  pre 95 it has to have the non cat test
Title: MOT fail-help
Post by: vonrumble on May 01, 2009, 10:07:32 AM
confirmed asked the MOT guy yesterday you should have had the non cat test mate, get it retested.
Title: MOT fail-help
Post by: 666FLO on May 01, 2009, 10:24:25 AM
thanks a lot for the info guys but I got date wrong. its M reg making it? a 94-95? does that still count as a non CAT test? please say it does!!

Think I\'m going to take the pervious MOT papers and this ones  over and have a word with him see if he will change it too a non cat test for me. Will use my female charms to help him change his mind. :). It can\'t hurt anyway if not I will just take it too another place and see what they say.
Title: MOT fail-help
Post by: 666FLO on May 01, 2009, 10:26:44 AM
read that post from 04 and its says

Non EU Imports

1st Aug 92 to 31st July 1995 inclusive

Non CAT test as follows:

CO <= 3.5%
HC <= 1200ppm

Source: The MOT Inspection Manual page 5a(ii) dated July 98

is M REG before july 31st?
Title: MOT fail-help
Post by: ro284 on May 01, 2009, 10:42:06 AM
Not all these mot Testers know about the non cat test, Mine paassed with excellent emissions last week, The guy said they sometimes have to go on a re-fresher course!  out of 12 guys tested for knowledge about emissions with regards to Early rotary cars, only two testers knew about the non cat testing. Fortunately my tester was one of them!
However my cars emissions were=
 CO:---0.01% vol
 HC:---41ppm vol Which i was very pleased with, i run premix 100/1 so that obviously is not a problem, (if anyone wondered as i did) That is with the Cat and the air pump on. 92 Jap model. standard ecu.also a Dolphin Tail pipe, if that makes any difference!
Title: MOT fail-help
Post by: johnm on May 01, 2009, 11:59:48 AM
Take to the 5 Mile Garage at Kingswells - great guys, actually tries to get the car through the test.  Once I had sorted my closed loop control, I had similar results to ro284 during my Cat test, but my idle emissions were not that good, must still have an issue somewhere, but passed mot.

Looking at your lamba I would say your air pump is not there or not engaging, but your CO and HC are very high, so yo may either have no cat, a defective cat and/or very rich.  With the air pump on, the lamba can be high circa 1.1 to 1.4.  

The air pump is the top pulley on the left of the engine.  There is a magnetic clutch, the triangle bit on the pulley should be rotating if engaged.  The relay for the the air pump is just in front of the air box.  There are four pins, back left, is 12v all the time - from fuse via air pump, the next nearest left is earth, the front left is a 12v when the ignition is turned on, the front right is the control from the ECU and causes the relay to latch on or disengage.  The mag clutch is controlled by earthing the live to disengage clutch.

Imports up to 1 Aug 95 do not need a cat test, those registered after do need one
Title: MOT fail-help
Post by: rxangus on May 01, 2009, 01:10:13 PM
I didn\'t think MOT testing stations had any discretion any more. They just type your registration into the computer and it sets the limit based on what your V5 says the age of the car is. If you have an M reg that that is first registered between Aug 1st 94 and July 31st 95 so non-cat test is correct.

Not sure you can argue with the tester though - may need to contact DVLA??
Title: MOT fail-help
Post by: 666FLO on May 01, 2009, 01:22:24 PM
I dont have the car at work with me, but now you\'ve mentioned that I\'m 98% sure that the air pump has been disconnected and I cant reconnect it coz it cause the car to back fire? must mess up the map in Apexi PFC commander thing ? would that be right?? I\'m guessing here but my car has probably has no CAT too. I can confirm that It is running slightly rich as well but it always has been since I bought it.

Oh well will check the car out this weekend and I\'m going to go back with all the papers and see if he can retest under a non cat. worth a try if not them i will take it to that garage you have mentioned.
Title: MOT fail-help
Post by: 666FLO on May 01, 2009, 01:28:42 PM
Quote from: rxangus;604385I didn\'t think MOT testing stations had any discretion any more. They just type your registration into the computer and it sets the limit based on what your V5 says the age of the car is. If you have an M reg that that is first registered between Aug 1st 94 and July 31st 95 so non-cat test is correct.

Not sure you can argue with the tester though - may need to contact DVLA??

yup it is defo an M reg, so not sure how that happened then if the garage has no discretion over it.. god don\'t say i have to contact the dreaded DVLA. :(. will see what he says first fingers & toes crossed..
Title: MOT fail-help
Post by: Gregory_Da_Grasshopp on May 01, 2009, 01:42:29 PM
For my FC the limits were CO <= 3.5%, HC <= 1200ppm non cat test!
1st test my actuall readings were 6.1% and 1700ppm
mines got no cat or emissions equipment on it, luckly the garge i do work on my car at has a tester so we ran the car up to warm operating temp and then he adjusted the timing a so not so much unburnt fuel came through the system. You  could see the readings drop! after that i got 3.1% and 1280ppm, we then put v-power in her and took her for a test, and i got a pass!!

hope this helps!
Title: MOT fail-help
Post by: 666FLO on May 01, 2009, 01:55:34 PM
http://www.motinfo.gov.uk/htdocs/m3s07000307.htm

just thought i would post this link up for anyone else who wants a read. Its the full guide to MOT testing.. lol. ( I think anyway) I  thought it was rather helpful. from looking at the chart he has said mine was after august the 1st but he couldnt find a match so he has used the cat test default..
Title: MOT fail-help
Post by: adib on May 01, 2009, 09:37:26 PM
ive a 92 fd and had my mot last week and the guy put it down as a cat car so it failed on emissions check with another place and they said he was right, said any car reg after july 92 has to be tested as a cat
Title: MOT fail-help
Post by: logicalChimp on May 01, 2009, 10:41:43 PM
any *UK* car after 92 has to have a cat.  Imports got another 3 years before needing a cat.