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P0420 - where do I add seafoam? Throttle body? MAF

 
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Old 26 Sep 2016, 02:51 pm
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Default P0420 - where do I add seafoam? Throttle body? MAF

108k miles 2006 pt cruiser base, non turbo.

Only changed oil, spark plugs, wires and pcv valve was replaced back around the 70k mark.

Right after I installed a k&n filter (3 days after) I get a p0420 code.

I live in California so a new catalytic converter is quite expensive. I'd like to try cheaper options first.

I'd like to try to clean the MAF (MAP on turbo cars?) And the throttle body. What about the IAC? Does the cruiser have that?

I put in a bottle of cataclean with 3 gallons and drove like a madman until tank was near empty. After starting up... check engine light was gone which is why I believe it's just caked on carbon that needs to be cleaned up. There is a slight hesitation or hiccup from idle to go which leads me to believe throttle body is dirty (never cleaner nor the MAF cleaned)

I'm going to remove the throttle body this weekend and clean it out with the seafoam and a toothbrush. Would another specific cleaner work better? Then I was advised to clean the MAF (but I read on this forum weird things about its placement and what it does. So I dunno) LASTLY, I heard I could spray some seafoam directly into the throttle body while someone revs the car to 3k rpm and the seafoam will go through everything and clean up the gunk.

True? If so... should I spray it directly into the throttle body or somewhere else like the pcv valve which I read in another thread.

Can I Rev the car with the throttle body by hand or will I need someone to help me out?

Lastly.. should I do it until smoke stops for a bit or do it until it stalls the engine... wait 30 minutes and drive off ?

Thanks for your help

Oh I also got specific MAF cleaner for the maf... I heard that shouldn't get any seafoam.


too long didn't read: got a p0420 code and want to clean out car instead of getting a new cat since California is expensive. Where do I add the seafoam? Throttle body? What about the MAF? How do I clean that?
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Old 26 Sep 2016, 03:08 pm
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Default Re: P0420 - where do I add seafoam? Throttle body? MAF

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Last edited by sanatanadharma; 09 Nov 2016 at 11:58 am.
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Old 26 Sep 2016, 03:29 pm
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Default Re: P0420 - where do I add seafoam? Throttle body? MAF

you cannot clean a MAP sensor. it senses pressure by. anything you do to it will likely destroy it. it contains a filter, a silicone diaphram, and a variable resistor. any chemicals can damage any of those. too much pressure (trying to blow it out) would also damage those. a good mechanic with a good scanner could likely tell you if its value is out of spec.


if you are not about to hire a good mechanic, i would instead recommend you try to test it(or replace it if it's cheap. if you're polite and they know you, you might even be able to return it.) i would try to test it first as i prefer to learn to do it and keep my money whenever possible.

there are a ton of these links available searching with google.

How To Test a Dodge Neon MAP Sensor - My Pro Street

http://easyautodiagnostics.com/chrys...gnostic-test-1
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Old 26 Sep 2016, 07:07 pm
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Default Re: P0420 - where do I add seafoam? Throttle body? MAF

Quote:
Originally Posted by sanatanadharma View Post
Use the OVR Purge Solenoid nipple
You won't need a helper


My experience
Do I just unscrew that top black piece? (ORVR Purge Solenoid nipple)?

Is there a way to up the revs manually through the throttle body? I see videos of people just turning that thing where the wire is attached to open the "butterfly" circle thing to let more air in. I guess I'll find out when I remove the throttle body to be cleaned before anyways, right? I bought seafoam as a bottle and another bottle with a spray attachment. Are those good enough to clean out the throttle body or would you recommend a specific Throttle Body Cleaner?

I'm guessing a ton of white smoke will be coming through.... I'll do this at my parents house which is in a nice area lol. Cops and firefighters are much more forgiving and kind there.

Noob wrench turner here. I have only replaced spark plugs, wires, replaced radiator fan, and changed oil.

EDIT:

Oh I see the second picture in the bottom right. Funnel with some hose? do I trickle it in slowly?
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Last edited by funkyfred; 26 Sep 2016 at 07:58 pm.
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Old 26 Sep 2016, 07:19 pm
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Cool Re: P0420 - where do I add seafoam? Throttle body? MAF

I'd just skip all that. Go to home depot and come back with two quart of acetone, with a funnel that can fit into your gas filler and pour it all in with a full tank. The acetone will clean out your catalytic converter and improve your power. I'd just safely ignore anything above and just do this first because I just did it to an old honda accord yesterday and it works.
Here's the test procedure you want to do in order to load the engine and heat the combustion enough to evaporate any carbon build-up.
On the highway, drive in alternating cycles of 40 to 60 mph or 50 to 70mph which ever you are comfortable with. Go full throttle until the upper range limit, throttle off and coast to the lower range limit. Repeat and make sure the RPM can go between 4000-6000. Half an hour to an hour of driving should do most of the cleaning and as you drive the car the rest of the cleaning should occur as the tank gets near empty where you would normally re-fill it.
Take an emission test again once you re-fill the gas tank, see how it goes
Alternatively, this procedure can be done with a half tank, and one quart of acetone.

Second. Before you go on the acetone clean procedure, go to the mopar parts supplier and get a can of this. Mopar/Chrysler combustion chamber cleaner part # 04318001ab
Follow the instructions on the can, take off the intake to the throttle and have someone hold the gas from in the car partly open until you spray the entire contents inside the throttle. let the car sit, then go do the highway run.

If these tips don't work, your catalytic converter was physically damaged and no amount of cleaning would have made a difference.
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Last edited by _PTGT03; 26 Sep 2016 at 07:25 pm.
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Old 26 Sep 2016, 08:00 pm
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Default Re: P0420 - where do I add seafoam? Throttle body? MAF

Quote:
Originally Posted by _PTGT03 View Post
I'd just skip all that. Go to home depot and come back with two quart of acetone, with a funnel that can fit into your gas filler and pour it all in with a full tank. The acetone will clean out your catalytic converter and improve your power. I'd just safely ignore anything above and just do this first because I just did it to an old honda accord yesterday and it works.
Here's the test procedure you want to do in order to load the engine and heat the combustion enough to evaporate any carbon build-up.
On the highway, drive in alternating cycles of 40 to 60 mph or 50 to 70mph which ever you are comfortable with. Go full throttle until the upper range limit, throttle off and coast to the lower range limit. Repeat and make sure the RPM can go between 4000-6000. Half an hour to an hour of driving should do most of the cleaning and as you drive the car the rest of the cleaning should occur as the tank gets near empty where you would normally re-fill it.
Take an emission test again once you re-fill the gas tank, see how it goes
Alternatively, this procedure can be done with a half tank, and one quart of acetone.

Second. Before you go on the acetone clean procedure, go to the mopar parts supplier and get a can of this. Mopar/Chrysler combustion chamber cleaner part # 04318001ab
Follow the instructions on the can, take off the intake to the throttle and have someone hold the gas from in the car partly open until you spray the entire contents inside the throttle. let the car sit, then go do the highway run.

If these tips don't work, your catalytic converter was physically damaged and no amount of cleaning would have made a difference.
The above advice from sanatanadharma sounds like part 2 of your advice. You say to pour it into the throttle body... do you mean in the same location or the giant hole on the drive side of the car? I would think I would need a spray since the hole is not on top... (maybe I just don't know since I haven't done it yet)

I'll look into the acetone. I need to do this soon so I can pass smog because I really need to get new tires.
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Old 27 Sep 2016, 01:24 am
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Default Re: P0420 - where do I add seafoam? Throttle body? MAF

Quote:
Originally Posted by funkyfred View Post
The above advice from sanatanadharma sounds like part 2 of your advice. You say to pour it into the throttle body... do you mean in the same location or the giant hole on the drive side of the car? I would think I would need a spray since the hole is not on top... (maybe I just don't know since I haven't done it yet)

I'll look into the acetone. I need to do this soon so I can pass smog because I really need to get new tires.
fred: seafoam comes in a spray too, and maybe you could do the same procedure as the mopar cleaner but i'd use the factory product.

the acetone will make you able to pass the smog test. thats why it should be done.
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2003 GT M/T in Onyx Green Pearl on Michelin Pilot Sport AS 3 Plus Tires 205/50ZR17. Dark Slate Gray Interior. OEM cargo net, parcel shelf, slush mats and trunk protector, mud flaps, mopar subwoofer. Platinum edition pedals, Neon SX 2.0 steering wheel with black+grey wrapped leather cover. Generic lowering springs, KYB gas shocks, Valeo solid flywheel conversion and clutch kit. Urethane insert engine mounts. Energy suspension full body urethane bushing kit. Chrysler premium front speakers, Jenson 6x9 rears. Boston Audio 4x55W amp. Panasonic head unit with xtenzi bluetooth. 300W AC power inverter. Escort 360max and Escort Shifter ZR4, dual front+rear dash camera. stage 1 blow off valve and syked tune computer . Boost and oil pressure gauges with Turbo-Timer. Needswings 3" exhaust elbow, Electric valve actuated Y-pipe with catalytic converter. To do: coilovers, 2step controller, quaife diff, Air-Fuel Meter
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Old 27 Sep 2016, 08:12 am
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Default Re: P0420 - where do I add seafoam? Throttle body? MAF

Have you verified that the rear oxygen sensor is working correctly?
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Old 27 Sep 2016, 09:11 am
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Default Re: P0420 - where do I add seafoam? Throttle body? MAF

Quote:
Originally Posted by _PTGT03 View Post
fred: seafoam comes in a spray too, and maybe you could do the same procedure as the mopar cleaner but i'd use the factory product.

the acetone will make you able to pass the smog test. thats why it should be done.
Acetone can damage components.

I would suggest resetting the engine trouble codes with an OBDII Scan Tool and see if it comes up again. You need to verify everything else has been checked out before looking at the CAT.
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Old 27 Sep 2016, 09:57 am
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Default Re: P0420 - where do I add seafoam? Throttle body? MAF

I'm not a fan of additive "cleaners"... iv'e tried a few before tear downs, they don't do a thing. sorry seafoam fans. not sure why you'd attack the intake for a exhaust problem however- if you do disassemble the intake be sure to replace the fuel rail o-rings along with all lower/upper manifold gaskets. I have the same mileage and mine were finished. especially the lower man to engine and the fuel rail...
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