Can a cracked intake tube cause P0420? - Toyota Nation Forum : Toyota Car and Truck Forums

Camry 3rd & 4th Gen (1992-1996 & 1997-2001)/1st Gen Solara (1999-2001) Toyota Camry Discussion for years 1992-1996 & 1997-2001, as well as Solara discussion for years 1999-2001. Topics of discussion range from fuel economy, safety, modifications, performance all involving America's favorite family car, the Toyota Camry.

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post #1 of 43 Old 03-17-2017, 11:47 AM Thread Starter
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Can a cracked intake tube cause P0420?

We thought we had this beat. New Cali cats, Denso o2 and A/F sensors. Now my friend P0420 has returned after 6 months and 1500 of driving and my NY inspection is due now!

I found some possible causes are injectors, or also intake air leaks.

I smoke tested it and found this immediately. Will this cause a P0420? It is a big crack right by the tube before the throttle body, you can see the smoke coming out of the crack. I hope the picture uploads, as you can see I'm new here haha
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post #2 of 43 Old 03-17-2017, 11:53 AM Thread Starter
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This is huge, sorry!
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post #3 of 43 Old 03-17-2017, 12:18 PM
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I don't think so, but maybe if it's overfueling due to the vacuum leak? I'd go nab a replacement, Pick-n-pull or order an aftermarket from eBay.

Here are the drive cycle procedures for Toyota/Lexus vehicles: http://www.totalcardiagnostics.com/s...i-drive-cycles

...that way, you don't have to randomly drive 1500 miles to get the smog monitors to run. Or maybe if it popped up after that long, one of your new components is bad. If the cat is marginal, could try Cataclean or TC-W3, or a sensor spacer on the rear HO2S.

95 Camry 5S-FE 168k
95 Camry 5S-FE 125k
00 Camry 5S-FE 187k
99 ES300 243k
01 ES300 151k
01 Insight 137k
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post #4 of 43 Old 03-17-2017, 12:20 PM Thread Starter
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I set readiness when we replaced everything last time and it's been set until then. I have a scanner that tells me which monitors are set to make sure we did the drive cycle properly.

Found one on Amazon for 28 bucks should be here tomorrow. But while I wait, I wanted to see if there were other things I could be testing for this P0420 code?
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post #5 of 43 Old 03-17-2017, 12:22 PM
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Quote:
Originally Posted by Jazmine View Post
I set readiness when we replaced everything last time and it's been set until then. I have a scanner that tells me which monitors are set to make sure we did the drive cycle properly.

Found one on Amazon for 28 bucks should be here tomorrow. But while I wait, I wanted to see if there were other things I could be testing for this P0420 code?
Duct tape up the intake hose and see if the code goes away

EDIT: With a vacuum leak that large it should also be throwing a P0171

95 Camry 5S-FE 168k
95 Camry 5S-FE 125k
00 Camry 5S-FE 187k
99 ES300 243k
01 ES300 151k
01 Insight 137k

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post #6 of 43 Old 03-17-2017, 12:27 PM Thread Starter
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Quote:
Originally Posted by insightbrewery View Post
Duct tape up the intake hose and see if the code goes away

EDIT: With a vacuum leak that large it should also be throwing a P0171
So far the only one current and also pending is the cat code. So frustrating!

If this crack in the tube cannot cause P0420, what else can? I would like to be checking those now. I work 2 jobs so this is my rare down time day
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post #7 of 43 Old 03-17-2017, 12:28 PM Thread Starter
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Quote:
Originally Posted by insightbrewery View Post
I don't think so, but maybe if it's overfueling due to the vacuum leak? I'd go nab a replacement, Pick-n-pull or order an aftermarket from eBay.

Here are the drive cycle procedures for Toyota/Lexus vehicles: http://www.totalcardiagnostics.com/s...i-drive-cycles

...that way, you don't have to randomly drive 1500 miles to get the smog monitors to run. Or maybe if it popped up after that long, one of your new components is bad. If the cat is marginal, could try Cataclean or TC-W3, or a sensor spacer on the rear HO2S.

NY inspection will fail with o2 sensor spacers. How can I check for new components to be faulty?
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post #8 of 43 Old 03-17-2017, 03:02 PM
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I had a huge tear in my intake when I got my 98 and it wasn't throwing any codes. Considering everything you've replaced, I'd be leaning towards a rich/leaking injector.

'98 gold Camry.....215,000 miles
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post #9 of 43 Old 03-17-2017, 03:31 PM Thread Starter
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Unhappy

Quote:
Originally Posted by masintenn View Post
I had a huge tear in my intake when I got my 98 and it wasn't throwing any codes. Considering everything you've replaced, I'd be leaning towards a rich/leaking injector.
I think they're original also. How can I check for leaking injector?
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post #10 of 43 Old 03-17-2017, 04:48 PM
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see if you have higher than -10 percent short and long term fuel trims combined at closed loop idle. if so, that would indicate a rich idle condition.
tony

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post #11 of 43 Old 03-17-2017, 05:10 PM Thread Starter
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OK will check this, thank you!
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post #12 of 43 Old 03-17-2017, 06:29 PM Thread Starter
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Quote:
Originally Posted by mcgowaw View Post
see if you have higher than -10 percent short and long term fuel trims combined at closed loop idle. If so, that would indicate a rich idle condition.
Tony
st -1.6
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post #13 of 43 Old 03-17-2017, 06:33 PM Thread Starter
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Here's the freeze frame
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post #14 of 43 Old 03-17-2017, 07:04 PM
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these numbers in the freeze frame don't mean much to me as they were taken while driving and not at closed loop, hot idle in park. redo and post the numbers both at idle and at 2000 rpm in park, hot engine.
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post #15 of 43 Old 03-17-2017, 07:24 PM Thread Starter
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Here ya go
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