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Go Back   REVscene Automotive Forum > Technical Discussion > Maintenance, Engine & Driveline Tech

Maintenance, Engine & Driveline Tech This forum is brought to you by The Speed Syndicate (TSS) in Burnaby.
Discussion of maintaining your engine, transmission, differentails, rear ends, and mods associated with "driveline" parts..

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Old 06-06-2009, 11:14 PM   #1
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4-AG powered ae86 failing aircare

so my 4-AG failed aircare.

theres a new cat in the car, distributor, plugs all changed.


now im lacking a sensor. i found a bolt that kind of covers a hole on the intake manifold facing the fire wall. got any idea what kind of sensor it is? temp sensor?

i noticed that a few vaccum lines are blocked off, so is the car lacking EGR?


my car failed only the NOx test, maximum allowable @2600, my result being 3700.

on a side note, the car was originally an ae85, but with wiring and engine swapped from a corolla gts.


anybody familiar with these cars?
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Old 06-06-2009, 11:17 PM   #2
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Sounds like, by your description of missing/blocked ports as well as aircare reading as a EGR.
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Old 06-06-2009, 11:22 PM   #3
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i didnt swap in the motor myself, neither the last owner did...


with several vaccum lines missing, is it safe to assume that i lack an EGR system of sorts?
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Old 06-07-2009, 02:11 AM   #4
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You don't NEED an EGR to pass Aircare.
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Old 06-07-2009, 11:27 AM   #5
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is the timing advanced? stock compression or is the engine modified? how about the cat, is it a 2 or 3 way? high nox means the exhaust is too hot, to put it simply. and an EGR valve lowers the temperature greatly
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Old 06-07-2009, 03:29 PM   #6
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stock compression, but im not sure about the cat. should be a two way.

exhaust being too hot eh... wonder if there are EGR parts for the 4age i can buy at the wrecker...
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Old 06-07-2009, 03:42 PM   #7
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i don't know if it had an EGR valve, but if it did, i would start there. my car doesn't have an EGR valve and my nox was at like 1400 when i got it aircared last week. so for next time, i'll probably need a new cat. i have a shitty 2 way right now, i'll probably get good 3 way for next year. the timing isn't advanced, and the engine is stock! good luck
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Old 06-07-2009, 03:52 PM   #8
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thanks!

but hate to admit it, i was driving her really hard for 20mins before i went.. T_T

but i am missing a temp sensor on the intake manifold.. maybe im running too rich too...
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Old 06-07-2009, 08:07 PM   #9
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you want the car warmed up when you get it aircared. you could be running rich, but your CO and/or HC would be higher too
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Old 06-07-2009, 10:15 PM   #10
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its CO and Hc levels are way below max... @_@
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