Question about 1995 Dodge Dakota

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NO ppm CA. smog at 15mph too high

3.9 dakota failed smog at 15 mph NO [ppm][MAX]508 [MEAS]700

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NOX is high coolant or engine temps
& egr issues

Lots on the internet to study on exhaust gases
& the reason they fail inspection or are too hi

Posted on Mar 27, 2014

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Posted on Jan 02, 2017

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How do you test the EGR system on a 95 dodge Dakota with a 3.9v6 & automatic


You can test it with a vacuum pump

I would be say if new spark plugs,new air
filter,new or clean rotor & cap,synthetic oil,don't take care
of it,you will need a new converter

Don't forget the oxygen sensor may be old as well

Clean out all leaves & dirt between the condenser
& radiator & make sure it doesn't over heat

The converter may be blocked as well as worn out

Sep 27, 2014 | Dodge Dakota Cars & Trucks

1 Answer

Fail smog


Not good. Could be many things-- bad cat converter, leaky fuel injectors, worn engine, bad plugs/wires, bad air filter, vacuum leaks, bad dirty EGR, others. You need diagnostic help.

Mar 26, 2014 | 1995 Dodge Dakota

1 Answer

How to fix asm emission test failure hc( ppm) max 61 gp 274 meas 690 at 15 mph, at 25 mph max 36 gp 224 meas 804


this is easy,, it can be 1 or 2 problems.

1: CAT is dead or weak, new cats can in fact hide a crappy engine.

2: bad engine. runs like junk and does not burn all its fuel.



any good shop can find this is minutes.

what I DO (no 5gas mach)

i check for (scan tool costing me $9 whole bucks) ask)

i check for closed loop status, idling

if ok then at 15mph and then 25mph , just racing motor in neutral.

if all 3 tests pass, im good.

if any fail, i fix that. bad fueling, bad spark or whatever.



if all 3 pass, its NEW CAT TIME



easy huh? a binary answer.

bad cat, bad motor. (or both)



when i say bad motor that means,every inch of the EFI/engine system.

every drop.

Dec 27, 2013 | 1994 Honda Civic

1 Answer

My 1993 honda civic lx failed smog check the HC and CO were hig HC=MAX was 79 and MEAS 98 and 25 mph MAX was 44 it meas 65 and lastly the CO MAx was 0.41 and MEAS 0.51


Its running rich and the most likely cause is the lamba sensors ,check them out with a multimeter to check the heater circuits are functioning and the reading coming out is correct

Mar 04, 2013 | Cars & Trucks

1 Answer

Failed the emission test. What can I do to make it pass? Any suggestions will b great :) Here are the specs... 1996 toyota celica 1.8 liter HC (ppm) 15mph max: 64 Actual mease: 96 25 mph max: 47 Actual...


don't know - check enginre hoses by hand. clean PCV valve. run some gas additive for carb or fuel injection cleaner. regap spark plugs. drive higway for 15 minutes before next test. pay money to have shop run computer analysis. may show up bad stuff eg. distributor wires.

Mar 03, 2018 | Cars & Trucks

1 Answer

I have a 93' Ford Taurus that failed emissions


run the fault codes to find the faulty sensor
sensors that control the exhaust emissions are the HO2S ( heated oxygen sensors in the exhaust manifold/s
the O2 sensor ( oxygen sensors after the cat converters ) and the EGR unit that recycles exhaust gas back through the engine to re-burn the gasses

Oct 17, 2017 | 1993 Ford Taurus

1 Answer

My 1990 chevy astro van didn't pass smog. Paperwork says it failed the following; Ignition timing: 99 ATDC. Also, ASM Emission Test Results; 15mph HC (PPM) max is 122 measured 127, 25mph max is 102...


the smog test looks like the engine is miss firing, that could cause the timing to be out of whack also, try a old fashioned tune up, new spark plugs, wires, and filters also replace the PCV valve. any time you see the NO that high suspect a miss fire.

Feb 24, 2011 | Chevrolet Astro Cars & Trucks

2 Answers

Need 92 toyota paseo to pass CA smog test ! What causes too high HC in smog test????


High HC means moisture in the system. Try driving it longer then take it to the smog shop. Otherwise it could be hard like a head gasket or easy such as a PCV not functioning. Any ways you should always drive it about 20 miles before smog check, longer when the weather is cold.

Nov 30, 2010 | Toyota Paseo Cars & Trucks

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