P0430 code 96 E300D problem
 

I've this code P0430 - "EGR Flow Circuit Malfunction".

Did some researches in this forum and found I need to clean the charge pipe, intake manifold, EGR and check fuses in K40.

I did all of them. Once I start the engine, cold, check engine light come out. I waited for it to warm up to drive. Very sluggish. Especially uphill. Once it is warmed up, I turn of the engine, erase the code, re-start the engine, CEL doesn't come back, but driving is still slugging. No power.

What's wrong? I use wvo, fuel filter has only 2800 miles.

Please help.

thx

P0430 code 96 E300D problem - 180000 miles

You need to make sure that the flaps in the crossover and intake manifold are working correctly. The cleaning that you did is good but the vacuum and electrical lines to the vacuum solenoids must also be good for the system to perform properly.

One consistency that I have seen on the forum is that at least half of the people with this kind of performance issue are using WVO. Suspicion, whether founded or unfounded, always falls upon the WVO system, the WVO itself, the installer, and the owner, and this must be eliminated as a possible cause before any progress towards a solution can be made.

So, help us here by providing some more information. What kind of WVO system are you using (commercial, home-made)? Single tank, dual tank, etc? Was the system professionally installed? Length of experience with this system (miles/years)? Where are you located? (Cold WVO does not burn well.)

If possible (since I don't know how your WVO system is plumbed), try switching back to pure diesel or biodiesel or a blend and see if the performance improves. Let us know and we will try to help you.

Jeremy

P0430 code 96 E300D problem
 

Hi Jeremy, Thanks for your post. The flaps in the crossover and intake manifold are working are FREE of obstruction before I put them back in. I manually play with them.

AS far the vacuum and electrical lines to the vacuum solenoids, how do I test them?

As far as wvo, very simple. 30 d/70 wvo in warm weather here (Eat coast), 50/50 cold weather. +15K mi. and +40K on a tdi. Never have any problem. Just change fuel filter every +/- 4000 mi.

Sam

Are you sure that the code is P0 430??? that is a code for a bad catalyst.

P0 403 is the code for an EGR issue.

On that car broken vacuum lines at transducer, transducer, OR bad EGR valve are the most likely issue.

P0430 code 96 E300D problem
 

Yep. That is what it said on the Actron Autoscanner Plus CP9180 - "EGR Ciircuit Malfunction ".

Where is the transducer? and How do I test the EGR valve?

THX

this is the Mercedes code:


P0430 Catalyst System Efficiency Below Threshold (Bank 2)

I agree. it is a:

P0403 code (EGR Flow circuit Malfunction)


Sorry for the missed type.

Vacuum lines are "tested" mostly by inspection. Look and feel for disconnected lines, rotten rubber connectors, split/broken plastic lines, etc. These items are the most likely cause of flap (and other) problems involving vacuum in a Mercedes. Remember that there will also be "vent" lines for the vacuum system that end in a filter or simply in a dead end. The purpose of these lines is to allow air back into the system when an actuator is released. We have all been fooled by one of these lines that look "wrong" but are simply doing their job.

You can test the flap actuators by applying vacuum from a Mityvac or other vacuum source, even sucking by mouth works. The rubber diaphragm inside the actuator sometimes develops a pinhole (or larger) leak or ruptures completely.

You can test the electric vacuum valves by removing the plug and applying 12 Volts to the two pins (polarity doesn't matter) for a second. You should get a "click" or "clack" out of the solenoid and you should be able to blow or suck through the solenoid when voltage is applied. They are less likely to fail than either the lines or the vacuum actuators but should be tested anyway.

Your diesel/WVO blending technique sounds OK as long as the WVO is appropriately filtered and de-watered.

Jeremy

Thanks so much. This is what I've been waiting for. Will do it so I can the damn car move again.

diesel/wvo blend - Yes. wvo sit for at least 1 months before it goes through two 1 micron filters. Need the exact way, just pm.

Sam