2.0D Smoke test results

Notts Ian · Oct 11th, 2020, 15:51

Good afternoon,

Had my car MOT'd on Friday - passed with no advisories but I don't understand the smoke test results. The numbers on the slip are:

Zero Drift pass
max.: 0.10 actual: 0.00
Mean value pass
max.: 3.00 actual: 1.48
FPT mean value pass
max.: 1.50 actual: 1.48

Does that last line mean it's only a borderline pass? Is there something I should look at before the next test?

TIA

Ian.

oilit · Oct 11th, 2020, 16:37

i found this on another forum:

......."The zero drift is I believe a check of the tester. They leave it measuring fresh air rather than the exhaust to make sure that it's reading is stable.
There are two possible tests, one is an average test and the other is fast pass. Thats what FPT means Fast Pass Test.
To get past the Fast pass it needs to be less than 1.5 on the first acceleration run which yours was.
If it exceeds 1.5 on the first run, they do 2 more runs and then average the 3 readings and that needs to be less than 3.0.
A car has to be really bad to fail a smoke test.
I found the last MOT for mine and it was 0.69 for a 300bhp plus 3.0 V6 TDI. The wifes 2005 75BHP 1.4 TDI recorded a 0.75 reading.
So 0.61 is good, no where near a fail."

Notts Ian · Oct 12th, 2020, 11:11

Thanks for that. Looks like it's not brilliant but nothing to panic over!

Oct 11th, 2020, 15:51	#1
Notts Ian Junior Member Last Online: Aug 18th, 2023 08:32 Join Date: Mar 2019 Location: Nottingham	2.0D Smoke test results Good afternoon, Had my car MOT'd on Friday - passed with no advisories but I don't understand the smoke test results. The numbers on the slip are: Zero Drift pass max.: 0.10 actual: 0.00 Mean value pass max.: 3.00 actual: 1.48 FPT mean value pass max.: 1.50 actual: 1.48 Does that last line mean it's only a borderline pass? Is there something I should look at before the next test? TIA Ian.

Oct 11th, 2020, 16:37	#2
oilit All the gear - no idea Last Online: Sep 16th, 2022 07:04 Join Date: Jul 2018 Location: Gloucestershire	i found this on another forum: ......."The zero drift is I believe a check of the tester. They leave it measuring fresh air rather than the exhaust to make sure that it's reading is stable. There are two possible tests, one is an average test and the other is fast pass. Thats what FPT means Fast Pass Test. To get past the Fast pass it needs to be less than 1.5 on the first acceleration run which yours was. If it exceeds 1.5 on the first run, they do 2 more runs and then average the 3 readings and that needs to be less than 3.0. A car has to be really bad to fail a smoke test. I found the last MOT for mine and it was 0.69 for a 300bhp plus 3.0 V6 TDI. The wifes 2005 75BHP 1.4 TDI recorded a 0.75 reading. So 0.61 is good, no where near a fail."

Oct 12th, 2020, 11:11	#3
Notts Ian Junior Member Last Online: Aug 18th, 2023 08:32 Join Date: Mar 2019 Location: Nottingham	Thanks for that. Looks like it's not brilliant but nothing to panic over!

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