Failed tx emissions again(update)
#990194
05/11/11 12:25 AM
05/11/11 12:25 AM
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Joined: Jan 2005
Posts: 450
Texas
6packattk
OP
mopar
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OP
mopar
Joined: Jan 2005
Posts: 450
Texas
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Need ideas on what to change beside O2 sensor,was worse,failed for hi nox in low and high range(failed last year too in high range only).Put new o2 sensor on it and took off egr and looked how dirty it was and pulled map sensor and checked it too but didnt change em.Guy at test place said catalytic convertor,this is second one on it,has 160,000 on it.May have to take to non emission state and sell it cause it still runs great,has 5.2 v-8 extended cab.Any techs feel free to chime in,thanks in advance.(91 dakota if that matters)
Last edited by 6packattk; 05/15/11 03:28 PM.
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Re: Failed tx emissions again
[Re: 6packattk]
#990198
05/11/11 11:47 AM
05/11/11 11:47 AM
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Joined: Nov 2003
Posts: 10,228
Colleyville
3hundred
I Live Here
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I Live Here
Joined: Nov 2003
Posts: 10,228
Colleyville
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My wife's '93 Ramcharger fails NOx pretty regularly, about every 5 years or so. Then we change the cat con and watch the numbers rise every year until it fails again.  The high speed test is usually okay, high but okay, it's the low speed that gets her. Other than failing emissions the truck runs great, pushing 300,000 miles pretty hard. Robert
'68 Fury Convertible
'69 300 Convertible
'15 Durango 5.7 Hemi
'16 300 S Hemi
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Re: Failed tx emissions again
[Re: None2Slow]
#990200
05/11/11 12:11 PM
05/11/11 12:11 PM
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Joined: Jan 2003
Posts: 3,505
DFW
mr_340
master
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master
Joined: Jan 2003
Posts: 3,505
DFW
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I had a 1990 Ramcharger with almost 250k miles on it. I had to back the timing back to TDC to get the NOx down to pass. It didn't make any power and I'd bump it back up to make it driveable again. Mopar has a combustion chamber cleaner that seemed to work well, but it didn't help the NOx numbers.
Floyd Lippencott IV
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Re: Failed tx emissions again
[Re: 6packattk]
#990202
05/11/11 02:56 PM
05/11/11 02:56 PM
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Joined: Jan 2003
Posts: 27,421
Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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Quote:
Thanks a bunch guys,left truck sit a year and I guess hoped it would heal itself.Ron cant wait to hear results of your new motor,I have one still in limbo a measly 446. Also I think my timing cannot be altered on the 91,Tbi with a notch on distributor base if I recall,I am probly gonna have to go with cat con #3. 
Thanks as I hope it runs as good as I would like it too.  Actually you can set base timing on a 91 with TBI. You have to unplug the coolant sensor as that puts it in a limp mode and the timing wont change like that unless you turn the dist as you can do that and check or set base timing. The 92 and up SFI is where you cant set the timing but you can set the dist pick-up sync to crank signal. You either need a scan tool or DVM to set the dist sync signal on the 92's and up. Good luck , Ron
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