I have replaced plugs, wires, and all four O2 sensors and for awhile climbing steep hills, especialy with a cold engine, I was still getting P1313 and P1314 misfire codes. These codes seemed to have gone away, but now out on the road I am getting P0430 and P0420 Codes either set or pending or sometimes both about 50% of the time. These are low catalist efficency on both banks.


Has anyone had success using cataclean in the gas tank to clean the cats and eliminate these codes?

 

Save the $25.00 and put it towards new cats. A buddy tried 2 cans ( out $50.00 SUCKER) on a V6 Honda that throw P0430 and P0420 Codes all the time. Did ZERO, total waste of money. He ended up doing the non-fouler trick on the O2 sensors and it "stopped" throwing the codes.


IMHO, if you have bad cats and/or a problem causing the cats to fail just replace them.

 

yes save your money my wife bought that once, car failed

 

It seemed odd that I didn't have the 0430 and 0420 when I was getting the misfire codes but do now, so I am wondering if there is really a problem with the cats or something else. What is the non-fouler trick on O2 sensors? (My O2 sensors are new.)

I figured my next step was to clean the MAF, but I don't know if a dirty MAF has any effect on the cat efficiency codes. My Long Term Fuel Trims are running -2 to -3 and both banks generally show the same numbers. I've read or seen that anything less than 10 either way on long term fuel trims is inconsequential.

We don't have annual inspections in Arkansas so the codes are more of a nusiance than an immediate necessity to fix and I hesitate to spend the big $$$ for new cats if it could be something else triggering them. Other than poor gas mileage (around 11 MPG) and having to put gas in the tank very very slowly, the engine seems to run well.

Edit: I just noticed that the vacuum line from the gas tank to the charcoal canister had become disconnected at the canister. Could that have any effect on the cat codes? It is an AEL system; I reconnected it.

 

[QUOTE=philwarner;558740]It seemed odd that I didn't have the 0430 and 0420 when I was getting the misfire codes but do now, so I am wondering if there is really a problem with the cats or something else. What is the non-fouler trick on O2 sensors? (My O2 sensors are new.)
the ol' non fouler trick is to install a spacer (a spark plug "non fouler" ) on the rear o2 sensors...thus pulling them slightly out of the exhaust stream.....to alter the reading to trick the ecu into thinking the cats are "ok"

"a friend" of mine tried this with good success, I believe the threads are 12mm x 1.25 ....a long nut from the hardware store and a drilled out bolt would work....or so I'm told....lol

 

[QUOTE=XCELLER8;558897] I wish someone/place just made a non-fouler/spacer to fit the D1 O2's. It'd be so much easier than trying to cobble something together.

 

[QUOTE=fishEH;559024]I actually bought mine online a couple years ago......thinking I was getting a "manufactured, special"part.....what they sent me was what I described.....sort of cobbed up hardware store stuff...lol.......they have since gone out of business...

 

This worked for me and they are inexpensive.

 

If Misfires are left unchecked, they can damage the cats. PO ran the vehicle with 2 misfires(engine was running on 6 cylinders) and damaged the passenger side cat, I got 2 of these and eliminated the code. I believe they make different sizes, so make sure you know the thread size of the D1, mine was for D2.

 

My D1 has 12 X 1.25 threads for the O2 sensors VS this adapter's 18 X 1.5; I didn't find a similar adapter with that thread from this supplier, but I'll look on the web further. I also need to crawl under again to make sure there is room for an adapter.

So these adapters take the downstream O2 sensors out of the exhaust stream so it reads lower O2 content? And it is the upstream O2 sensors that determine the fueling? And the downstream sensors are there just to deternimine the cat efficiency?

Edit: I did a pretty through search and apparently no one makes an extender for M12 X 1.25 O2 sensors; all are M18 X 1.5. Did all O2 sensors go to the larger thread after 98?