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Suppliers/Dealers or anyone selling with a commercial view in mind CANNOT post here unless responding to a specific request of a member in a "wanted" post.
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What did you do to your jimny today?
12 Nov 2025 14:40 #262691
by mlines
Martin
2003 M13 early KAP build.
3" Trailmaster lift with 1.5 Spacers on front
Customised winch bumper and roll cage
235/85R16 Maxxis Bighorns on 16" Rims, 4:1 Rocklobster, Rear ARB locker and on-board air
Corrected arms all-round, rear disks, Recaro seats and harnesses
Replied by mlines on topic What did you do to your jimny today?
A few weeks ago James' SJ failed the MOT on headlamp aim and emissions. You will have seen my recent video short on "left hand drive" headlights, so that issue was sorted by purchasing the correct headlamps.
Moving on to the emissions, these were 3.5-3.6% CO which was too high (3.5% is max for this age of vehicle). Now the carbs on these are known to be fiddly and tempermental, so I could see the fix could involve going backwards and forward to the garage until we got it correct. This would run up a bill.
Therefore I invested in the dreaded Gunsons GasAnalyser. Why "dreaded", they are notoriously inaccurate for modern cars. Indeed at +- 0.5% accuracy they are more inaccurate than the typical reading required on a modern ECU controlled fuel injected car. So you could never read a car that has a 0.5 required reading..
However the SJ is carbed and only needs to be below 3.5%. On the MOT test rig it was around 3.5 to 3.6 % CO. On the home test the Gunsons read 3.0, so you can see that within the range of error this could be 3.5%, the same as the MOT. I treated this as a "calibration" for the tool.
Next hurdle was the mixture control, this is tamper proof (you require the correct tool). Having tried a likely looking tool from ebay (didnt fit) I resorted to cutting off the tamper ring.
Then it was a quick tweak on the driveway and we were down to 0.8 % which is 1.3% based on the original "calibration"
Suzuki say it should be 1.5% +- 0.5% so between 1% and 2% so we are right on the money.
Job done!
Moving on to the emissions, these were 3.5-3.6% CO which was too high (3.5% is max for this age of vehicle). Now the carbs on these are known to be fiddly and tempermental, so I could see the fix could involve going backwards and forward to the garage until we got it correct. This would run up a bill.
Therefore I invested in the dreaded Gunsons GasAnalyser. Why "dreaded", they are notoriously inaccurate for modern cars. Indeed at +- 0.5% accuracy they are more inaccurate than the typical reading required on a modern ECU controlled fuel injected car. So you could never read a car that has a 0.5 required reading..
However the SJ is carbed and only needs to be below 3.5%. On the MOT test rig it was around 3.5 to 3.6 % CO. On the home test the Gunsons read 3.0, so you can see that within the range of error this could be 3.5%, the same as the MOT. I treated this as a "calibration" for the tool.
Next hurdle was the mixture control, this is tamper proof (you require the correct tool). Having tried a likely looking tool from ebay (didnt fit) I resorted to cutting off the tamper ring.
Then it was a quick tweak on the driveway and we were down to 0.8 % which is 1.3% based on the original "calibration"
Suzuki say it should be 1.5% +- 0.5% so between 1% and 2% so we are right on the money.
Job done!
Martin
2003 M13 early KAP build.
3" Trailmaster lift with 1.5 Spacers on front
Customised winch bumper and roll cage
235/85R16 Maxxis Bighorns on 16" Rims, 4:1 Rocklobster, Rear ARB locker and on-board air
Corrected arms all-round, rear disks, Recaro seats and harnesses
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