What is the proper emissions testing procedure for diesel engines?

**ghosthunter** · May 26th, 2009 11:18 AM

[SIZE="4"]What is the proper emissions testing procedure for diesel engines?[/SIZE]

Particularly for roadside testing. And how slow/rapid should the accelerator pedal be pressed/pumped?

I can't seem to find it in the older threads.

**rst619** · May 27th, 2009 09:33 PM

I have a soft copy of the procedure. here

4. Test Procedures and Smoke Opacity Measurement
a) Follow the opacimeter manufacturer's instruction for on the proper
installation, operation/use and checking the accuracy and calibration before
and after each test.
b) Set the vehicle gear-change control in the neutral position and the handbrake
effectively engaged.
c) Start the engine and warm it up to its normal operating temperature.
d) Accelerate the engine two to three times (2-3) prior to smoke sampling in
order to remove deposits of soot and other carbon particles in the tail pipe.
e) With the engine idling, depress the accelerator quickly, but not violently, to
obtain maximum delivery from the injection pump. Maintain this position until
maximum engine speed is reached for about two (2) to four (4) seconds and
the governor comes into action. As soon as this speed is reached, release
the accelerator until the engine resumes its idling speed. Record the
maximum reading of the smokemeter.
PRIME-M4 Page 27 of 27
f) The operation described in paragraph (4)(e) shall be repeated not less than
six (6) times in order to clear the exhaust system and to allow for any
necessary adjustment of the apparatus. The maximum opacity values read
in each successive accelaration shall be noted until stabilized values are
obtained. The values read shall be regarded as stabilized when four (4)
consecutive readings are within a hand width of 0.25 m-1 and do not form a
decreasing sequence. The arithmetic mean of the four stabilized values shall
be the test result for the concerned vehicle.
g) For motor vehicles designed with several exhaust outlets that are individually
connected from paired exhaust ports, the free acceleration test shall be
carried out on each outlet. In this case, the values used for calculating the
correction to the absorption coefficient shall be arithmetical meanvalues
recorded at each outlet and the test shall be valid only if the extreme values
measured do not differ by more than 0.15m-1
For motor vehicles designed with several exhaust outlets connected from one
exhaust pipe coming from the engine's exhaust manifold collector, the free acceleration
test shall be carried out only on one exhaust outlet, the other outlets effectively blocked
to prevent leaks.
h) Seal the full load screw of the injection pump/delivery system of the motor
vehicle after a pass-test to prevent tampering;

however some machines have a slightly different procedure but the free accel test are uniform.

hence the technician really has to rev your engine to "max governed speed" so roughly 4K rpm yan

**testament11** · May 28th, 2009 09:40 AM

so, if 4k rpm siya irerev, eh kawawa ang ibang sasakyan nyan! as for mine, 4k rev is almost emitting black smoke.

as i observed, dapat prior to emission testing, dapat linisin na ang exhaust system para hindi fail ang result

**XTO** · May 28th, 2009 09:59 AM

It depends. There are different rev limits between turbocharged and non turbocharged. For N/A it should not go beyond 3000 RPM gradual pressing of the pedal. Normally diesel redline is between 3.9K and 4.2K. 4000 RPM is an overkill and will definitely blow black smoke. FAIL

**testament11** · May 28th, 2009 10:23 AM

TDIC ang sa kin. at ayun nga, failed ang emission test ko nung nagparehistro ako last september. hindi ko lang alam kung hanggang saan pinaabot ang revving at eto ang problema sa mga emission test centers, over revving. kaya tuloy nagtaka ako bakit bumagsak ang sasakyan ko. maybe a revision on how emission tests procedures is needed

**migs0624** · May 28th, 2009 10:30 AM

applicable ba ang italian tuning for diesel engines?

napansin ko sa kia carnival diesel namin, pag hahatawan ko talaga,
daming usok. matatanggal ba carbon deposits by revving it high?

**XTO** · May 28th, 2009 10:39 AM

Originally Posted by migs0624

applicable ba ang italian tuning for diesel engines?

napansin ko sa kia carnival diesel namin, pag hahatawan ko talaga,
daming usok. matatanggal ba carbon deposits by revving it high?

pwede mabawasan but very visible talaga ang exit ng carbon, the best remedy is the water flushing (thru the exhaust pipe) repeat at least 4X till the water becomes clear. once a month will be fine pero dapat walang catalytic converter.

**migs0624** · May 28th, 2009 10:49 AM

Originally Posted by XTO

pwede mabawasan but very visible talaga ang exit ng carbon, the best remedy is the water flushing (thru the exhaust pipe) repeat at least 4X till the water becomes clear. once a month will be fine pero dapat walang catalytic converter.

paano yun? just flush the exhaust pipe with hose or with power sprayer? hehe
hmm. mukhang mapapahataw ako neto everyday

**XTO** · May 28th, 2009 10:59 AM

yup garden hose lang (not pressure washer lakas ng hangin nun) then pag umapaw, bunot then rev mo na up 3000 rpm till maubos ang laman then insert ulit, repeat mga 4X. parang labatiba hehe. best practice before emission test for registration. sigurado pasado

but yun nga di pwede pag may catalytic converter.

**migs0624** · May 28th, 2009 11:05 AM

Originally Posted by XTO

yup garden hose lang (not pressure washer lakas ng hangin nun) then pag umapaw, bunot then rev mo na up 3000 rpm till maubos ang laman then insert ulit, repeat mga 4X. parang labatiba hehe. best practice before emission test for registration. sigurado pasado

but yun nga di pwede pag may catalytic converter.

hahaha!! thanks pareng XTO! ;)