P0430 Code Help

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fyremanpat

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Just had both Cat's checked and both are within normal limits. Also replaced all 4 O2's. Code hasnt come up in 4 months since replacing O2's. What else could it be?
 

bsamoul

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Does this mean that the code came up again, or what? I have the same code but I haven't done anything about it except the 4 o2 sensors
 

fyremanpat

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Yea. It first came up about 6 months ago. I erased the code and replaced the O2 sensors about a month later. Than this past Monday I got the code again.
 

Razincayne

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Not saying that this could be it but, if your cats are too high flow to be OBD II compliant this could be throwing codes. Could be that the exhaust gas exiting the catalytic converter is too similar to the exhaust gas entering the converter. A faulty or overloaded converter due to an unbalanced air/fuel mixture can cause this condition.
Check the exhaust system for air leaks or holes rusted through. Any outside air that leaks into the exhaust can go through the cat as lean exhaust and hurt its efficiency and throw codes.

You may want to test the O2 sensors again for proper operation. Just because you replaced them doesn't mean you may not have a bad one.

So many more things might be going on to be throwing you this code. Common causes include incorrect fuel pressure, an EGR system malfunction, MAF sensor malfunction, intake or vacuum leaks, incorrect timing, a bad PCV system, misfires, injector problems, cooling system problems, a restricted air filter, a head gasket leak, or a high oil level.

Hope this helps. Keep us informed what you find out.
 

bsamoul

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So many more things might be going on to be throwing you this code. Common causes include incorrect fuel pressure, an EGR system malfunction, MAF sensor malfunction, intake or vacuum leaks, incorrect timing, a bad PCV system, misfires, injector problems, cooling system problems, a restricted air filter, a head gasket leak, or a high oil level.

Damn... That's a lot of things to go through lol
 

JennaBear

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Did this happen before of after you put the aftermarket MAF on. We have seen people have quite a few issues with that MAF.
 

fyremanpat

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All the mods were done in 2002, and just with in the past few months it threw a code. I have noticed a slightly rough idle. Its been a while since she got new plugs, cap and rotor. I'm gonna start there and see what happens. As far as air/fuel, its all good. I had her on the computer and went through the RPM's...and it was within norm limits. Thanks for the help guys, let me know if you have any other suggestions.
 

treepete

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I think the MAF might be the trouble spot. can you slap your old one back in real quick, and see if the code comes back?
 

fyremanpat

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Finally had some time off today and was able to get under the hood...And...I believe I have solved the problem. A rather corroded d. cap and rotor were partly to blame and also a filthy MAF sensor. Now that I think about it, the cap and rotor havent been changed in about 7 years... After replacing the cap and rotor and cleaning the MAF sensor with some electrical contact cleaner I had laying around, I put everything back together. The HO4SHO fired right up and the rough idle was gone. I drove it around for a bit and everything was good....Until I tried to start it several hours later. It would turn over but just wouldnt fire. After going through everything again I figured out what I did...NOTE TO SELF...Dont use elctrical contact cleaner WITH lubricant on MAF sensors. Spend the extra money and get the right stuff and it really did make a difference. And finaly everything is good. Thanks again for the help!
 

fyremanpat

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Its made by CRC and called MAF Cleaner. Got it at Advanced Auto. It leaves zero residue. About 6 bucks a can but worth every penny. It also promises 4-10 HP gains at he wheels by just cleaning it.
 

Turbizzy

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Not trying to burst your bubble here but if your setting a P0430 code yes all those things could be causing issues but it would also set a P0420 bank 1 as well as the p0430 bank 2 codes. Im thinkin your bank 2 converter is prob not workin as good. Very common. How do you know its good? Use an Ocilliscope to monitor both the front and rear o2 sensors on bank 2 and hold it steady at 2000 rpm and make sure the second o2 signals don't match the first o2's signals that much. If they match pretty good then chances are your cat isn't doin squat.
 

fyremanpat

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I had the mechanics at my work hook it up the the computer and watched all the O2 sensors (which were within normal limits). Then went to big Al's and they drilled the exhaust and checked back pressure (which also was within in normal limits). After all that I pulled the distributor and it was severly corroded (4 and 6 cylinders were the worst) that along with a filthy MAF caused to much unburnt fuel on the right bank, causing the catalyst system efficiency to be below threshold. And now this weekend im putting new plugs and wires in.
 

treepete

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I enjoy the MSD pre-length wire kit. It fit great, I never had any trouble with them at all.
Course, I never had trouble with the stok ones, but I upgraded them anyway.
 

JP422

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I agree w/ treepete... the MSD wires are a great fit, look nice, and also have WAAAAAY less resistance (more spark from the cap to your plugs?) I tested the stock wires vs. MSD wires using a simple multimeter w/ Ohm readings... and the resistance is so much lower on the MSD's. I don't know if you can "feel" the difference, but it just makes sense not to waste the spark energy from the distributor by using high resistance wire.

Over ten yrs ago, I also tested stock oem wires from a Dodge neon that had a wastespark dual coil pack for 4cly engine. The wire was only 3-5" long... but I replaced them on a customer's car w/ Magnacor 8mm wires. I was curious to see the resistance levels betweent the oem vs. aftermarket... because the lengths were so short... but the results were suprising. The performance wires had so much lower resistance even in a few inches of wiring... plus the nice fit/finish and silicone jackets are a bonus.

As for the MAF cleaning... so far I've been using brake cleaner spray ($2.99) to clean them. I've used it for my Granetelli... as well as for my family's Audi's and Lexus's. It was mainly because I didn't have the "MAF cleaner" but I have many cans of brake spray =)

It's been several yrs, of using brake cleaner... and so far so good. No MAF problems yet... (looking for some wood to knock on)
 

JP422

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haha... I really don't know if there is any gain... in fact, I don't even know why I got it.. I got suckered by the claims of extra HP I guess. My stock MAF was working fine.
Anyway, the Granitelli MAF is working fine too (dunno about gains)... but I do know that on smaller cars and engines, a free'er flowing MAF does help w/ engine response.

Regardless.. I shoot the Grany MAF w/ brake cleaner too! heh heh heh...

Jennabear... I'm just curious... I know you don't like the Grany maf.. but what exactly don't you like about it? Is it hurting performance? It only hurt my wallet yrs ago... but I'm over it now.
 
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