7
Does it make the most sense to replace an old car's entire exhaust system all at once?
Considering your car is almost 10 years old, having to replace all of the parts in the exhaust system does not sound unreasonable, especially if your locality uses any type of road solvent during the winter months (they didn't in Montana where I'm from originally, but ...
7
As a vehicle technician for BMW I can assure that it is good for your engine to get rid of EGR. EGR systems are there to improve the exhaust gas quality and slightly win a few miles on a tank (in theory). What really happens is quite different. Your oil will become polluted quicker, your manifold / intake will get clogged by excessive amounts of soot and ...
6
Although I've never done this, a trick I've come across involves feeding motorcycle clutch cable with copious amounts of brake cleaner into the blockage, attaching the end of the cable to a cordless drill and effectively drill out the carbon.
5
Ethanol % PID is the cars best guess at the ethenol level is in the fuel. This is more common on E85 Vehicles.
Commanded EGR is what the car wants the EGR valve position to be at, not all cars have electronic EGR valves some are simple vacuum solenoids/diaphragms.
Happend to run into a truck with an electronic EGR setting a position code.
Working
4
If this is the V6 Accord, it very well could be an issue with carbon buildup again. It seems there was a tech bulletin which was issued by Honda about it for the 98-01 Accord and 99-02 Odyssey.
I found a pretty write-up of how to get it really cleaned up, as getting it into a good state is quite a bit of a job. Here is where the write-up can be found with ...
4
One possibility is that the turbo is sometimes over-boosting, which is being detected by the engine MAP sensor. The way that the engine ECU can control this over-boost to avoid engine damage is by limiting the amount of fuel injected into the engine, which would of course cause a sudden drop in power. The over-boost could be being caused by a seized turbo ...
4
If you take it off of the engine, your best bet is to clean it with carb cleaner. Don't submerge it in anything, as you can cause damage to any diaphragm seals which may be present (if vacuum operated) or in any electrical motors which do the work.
Also, when you clean it, don't forget to clean the ports in the intake manifold. They will also be clogged. ...
4
I suspect that this is caused by one of two things although it could be a few more. It is most likely a sticky ISV. The ISV or Idle Stabilization Valve is responsible for allowing just enough air through the engine to keep it running when the throttle pedal is being pressed. If this is faulty, the car will run perfectly until you take your foot off the ...
4
The glow light flashing and a reduction in power is a classic symptom of an EGR valve problem on VW group diesel engines, so it sounds likely that the mechanic made the right call on replacing it, especially as your car is working again. If your friends are saying it wasn't an EGR valve they are probably wrong.
If your friends are saying that the valve could ...
3
There are a number of ways to clean it but I've had personal success with oven cleaner and a tooth brush. Obviously wear protective gloves and do it somewhere well ventilated. Also, throw the tooth brush away when finished.
Good luck.
3
It depends whether the EGR valve is stuck open or shut. Stuck open would cause drivability issues and decrease MPG.
Stuck shut would cause no adverse affected apart from the check engine light (in some vehicles it may go into limp mode).
The reason is that a engine to run most efficient it needs cold, clean and dry air; the EGR valve lets the hot, dirty, ...
3
In order to clean it, just remove it
This is a messy job.
You don't want any of that carbonized waste going into the motor or all over yourself.
If you get an automotive parts dip, you can remove the EGR and place it in a basket and let it soak.
I use this for carburetors to EGR's. It will eat aluminum if you leave it in too long so check it ...
3
Most people just clean the EGR port with a small drill and think they are done. Just inside where the throttle body mounts They are 2 side passages that are often overlooked. I had to bend a wire and dig them out. They were stopped up solid. I also took a pressure washer to the plenum. Lots of gunk and carbon came out. Hope this helps someone.
Gene
3
Classic fuel starvation, probably caused by an old, gummed up fuel filter. Replace the fuel filter and purge the injectors (remove them from the head, crank the engine a few times and clean the injectors thoroughly).
If this doesn't solve things get the fault codes read as it could be something like a problem with the injector loom.
3
Nobody here can tell if your EGR value is irreparable damaged or not. Some valve models are frail and easily damaged, others are quite robust and cleanable until the damage is too big.
Most of the time the failure is that the valve is full of carbon and the actuator cannot move the vale. Some models are quite robust and just seize, but have a good ...
2
I don't think you replaced the injectors. I think you replaced the spark plugs. Injectors are what spray gas into the combustion chamber, and those are usually replaced or cleaned on older cars.
You said it happened right after the spark plugs were replaced. Why not replace them again? They might be the wrong spark plugs, they might have the wrong spark ...
2
Vehicles with variable cam timing on both cams don't need EGR in the traditional sense. They vary cam timing to increase overlap during cruise to allow exhaust gasses to partially fill the intake stroke as a traditional EGR would.
2
I haven't found anything which definitively states one way or the other on the EGR valve for SKYACTIV-G technology. What I can tell you is the purpose of the EGR and because of that why the technology itself would not cause the demise of the EGR.
EGR or Exhaust Gas Recirculation is a technology which was introduced to limit temperatures during combustion. ...
2
You might find this post about Dynamic EGR Control for TDIs on the TDI Club forums by Mark at Malone Tuning interesting. Mark reports on his experiments with the EGR system on a 2006 TDI. He reports that the stock EGR settings resulted in a faster warm up (less wear on the engine) and better fuel economy than he got with the EGR deleted or dialed back.
The ...
2
At idle, your EGR valve should be closed (read: not activated), allowing no exhaust gas to get into the intake air. At idle, any exhaust blended in with the fresh air might indeed cause your engine to have a rough RPM.
A rough idle combined with a fault code for excessive exhaust flow of your EGR system is a good indicator that it is well worth trying to ...
2
My suggestions for next steps to take:
Vacuum gauge testing at a warm idle, is it steady? A running compression test as well. Mechanical integrity should be verified before chasing any bad data theories.
Freeze frame data, you mentioned the light comes on at a warm idle. Does your freeze frame agree? Correct me if Im wrong, but your vehicle will shut ...
2
No, it is certainly not okay, but I doubt it's coolant. It's probably condensation...
ON EDIT:
HandyHowie and the OP (Mostafa) are indeed correct. Now that I know what vehicle we are speaking of, I went to AllData and found this:
It is coolant, and for exactly the reason Howie suggested. EGR reduces combustion temperature with a "cool" non-combustible ...
2
No, they are not connected in any way.
The EGR deals with exhaust gasses. They can, over time, get plugged with soot or possibly have a mechanical failure (depending on design). The EGR only comes into play after power generation, and has no connection to the raw fuel or fuel delivery system. Unless the leak was directly spraying on the EGR, there's no way ...
2
OK, so the first thing is that the continuity setting on my multimeter doesn't work very well.. I redid the resistance tests using the regular Ohm-meter setting and was able to identify all the pins:
EDIT
I went back and remeasured both the original EGR and the replacement
one while both cold and off the engine. My updated measurements make me suspect that ...
1
Letting the valve soak over night seems to be a common way. Just make sure you only flood the pipes and not the actuator.
There are specific EGR cleaning agents (sprays) sold at a lot of places; might work better than generic carb cleaner, or not.
Somebody reported success using oven cleaner from the kitchen, but I'd go for soaking with EGR cleaner first.
...
1
True, but the temperature problem applies mostly to diesels. Diesels have a NOx problem due to lean air fuel ratio, and a catalytic converter cannot solve it because there is too little CO and HC in the exhaust that could be used to reduce NOx. Yes, diesels have catalytic converters, but they are oxidizing and not three-way: they eliminate what little CO and ...
1
You don't state which model you have, so I'm conveying information relevant to the W124, W202 and W210 series. If your engine is a OM602 or OM605, then the EGR is notorious for clogging up the intake runner. Disabling the EGR will improve performance because it leaves the butterfly valve in the intake runner fully open, with the added benefit of never ...
1
Fords use a differential pressure sensor on the EGR system to detect operation. There are two hoses (one with a slight restriction) coming off the EGR tube and the DPFE sensor. If the sensor doesn't detect a change in pressure when the egr solenoid is commanded it will set a low or no flow code. If the sensor is removed it'll set a circuit code.
I'd assume ...
1
This can be many different things ranging from a automatically resetting breaker to overheating electronics to vibrations and loose wires to hydrolock especially if your fuel line is loose and sitting somewhere it shouldn't be.
When it stalls do you still have battery power or is everything off till you turn the key to off?
or or is everything off till you ...
1
Update March 2016
Still no errors regarding the DPF.
Had an issue with the engine cutting out at high revs after this which I have also solved.
Update 21st Dec '15
I've fitted the blanking plate this weekend and although the error didn't clear immediately it did after a short drive and hasn't come back after a few days of driving. Fingers crossed that ...
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