Question about 1997 Volkswagen Eurovan

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I sent my 2.4 diesel in for its nct and and the guy said it would not rev out fully so he could not do the emission test. but it has been fully serviced and sounds as if it is revin out fine. i checked the diesel filter and the cat and all is fine. thanks

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The intake could be all caked up with carbon. I often have to replace or clean intakes because they can be 90% clogged, most noticeable when they don't want to go back 70mph or seem to have less power than normal.

Posted on Jul 07, 2009


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After warm up engine runs ruff and loss of power

Injectors need cleaning if it is a diesel
There is a buold up of contaminants in your fuel system that needs to be cleaned out

If it is a petrol engine I would be very surprised

Just add a couple of treatments of injector cleaner to a full tank of fuel and go out for a high rev blast for an horor twom that should hopefully clean it.

My old renault laguna failed emissions so I PUT 2 bottles of forte injection cleaner and went out for a 70 mile blast, it was a diesel car. I returned to the testing station within 2 hours and the black smoke had ccleard and I got the pass certificate.

Jul 09, 2015 | Cars & Trucks

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I have a 92 golf 1.4 carb engine and its burning to much fuel for the emissions, Any 1 got any ideas howto solve this. Thanks

1 make sure the choke is not sticking
2 see if you can get to mixture adjusting screws toward the base of carb to adjust in.If there are two screws you have to adjust the both of them the same.Do thes a 1/4 turn at a time.

Feb 04, 2013 | Volkswagen Golf Cars & Trucks

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Ok the Guy.that ran the emissions test it don't

Check the help link

Vehicle smog test failed Due to NO MIL/check engine light?


Dec 22, 2012 | Cars & Trucks

1 Answer

My 2001 vw passat 1.6 petrol failed nct. Emissions low idle and high idle too high

change the O2 sensors and if that doesnt work then its a new cat ,you can test the sensors first if you have a automotive test meter though its easy with the right gear ,the two wires with the same colour should read 12v heater circuit and the other two should read a variation from 8v to 12v depending on engine speed

Aug 17, 2011 | 2001 Volkswagen Passat

1 Answer

My 1999 Volvo S 80 failed the NCT Test - emissions problem - even after new Lambda sensor was fitted - any suggestions

Scan the computer for any other trouble codes. Other sensors can throw off fuel/air mixture too. In future, posting what component(s) of your emission gasses failed would be useful. Be sure to test the car when it is good and warmed up and has been running for a while, don't let them test you cold!

Feb 18, 2011 | 1999 Volvo S80

1 Answer

Hi i have a navara d40 that will not pull below 2000 revs after it has only got 75% power,some times it works allright until i run at low rev for more 5 mins, i have had the turbo cleaned with proper...

Are the any trouble codes being activated from this occurring?

And can you monitor the fuel rail pressure with it faulting? All you need is an obd reader to do this.

Could be a whole range of problems, but it is most likely a fuel pressure fault.

Do you service the vehicle yourself, the stored and self learned parameters for the high presure fuel pump need to be reset evey time after you change the fuel filter, or it will have incorrect values.

To clear the codes from your ECM do as follows;

Set Diagnostic Test Mode II (Self-diagnostic Results)

1. Confirm that accelerator pedal is fully released, turn ignition switch ON and wait 3 seconds.
2. Repeat the following procedure quickly five times within 5 seconds.
a. Fully depress the accelerator pedal.
b. Fully release the accelerator pedal.
3. Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 10 seconds until the MIl starts
4. Fully release the accelerator pedal.
ECM has entered to Diagnostic Test Mode II (Self-diagnostic results).

To Erase Diagnostic Test Mode II (Self-diagnostic Results)

1. Set ECM in Diagnostic Test Mode II (Self-diagnostic results).
Mode II (Self-diagnostic Results)" .
2. Fully depress the accelerator pedal and keep it for more than 10 seconds.
The emission-related diagnostic information has been erased from the backup memory in the ECM.
3. Fully release the accelerator pedal, and confirm the DTC 0000 is displayed.

Or in short
Ign on count to 3
full on and off throttle 5 times within 5 sec's
count to 7 hold throttle down for 10 or so seconds
wait for the ECM light to flash let go of throttle and your in count the codes after you have written them down or fell you don’t need any codes just hold the throttle down until you see the ECM pattern change to ten fast flashes twice and then ten slow flashes and there you have one reset ECM

Hope this gets you somewhere.

Feb 26, 2018 | Nissan Pickup Cars & Trucks

1 Answer

1999 E300 TD overrevving and smoking.

you sound on the right track it could have been pulling oil from the crankcase through the crankventilation valve

May 08, 2010 | 1991 Mercedes-Benz 300 Diesel

1 Answer

Diesel rodeo dies and lack power when cold and in winter

Try changing the fuel filter and get the glow plugs checked or replaced .Diesel goes a little waxey in colder weather making it harder to go through the filter .
Hope this helps.

Jul 23, 2009 | 1988 Isuzu Trooper 2 Door

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