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Index > Engine/Drivetrain > Thread: failed emissions
Thread: failed emissions
Tom93R1


Redlining
Posts: 458
posted November 15, 2003 01:41 PM

failed emissions

Just got back from the emissions inspection station and wouldnt you know it, I failed.

First I failed the gas cap, my seal is horribly cracked. Anybody know a good way to replace the seal since nobody sells a cap that works any more?

Then I failed HC, under load i was at 502 and at idle I was at 548. Both these have a limit of 400. Will alcohol help with HC? Whatever is wrong shouldnt be too bad since it wasnt really that far off.


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rotormunky


Redlining
Orlando, Florida
Posts: 424
posted November 16, 2003 07:46 AM

quote:

First I failed the gas cap, my seal is horribly cracked. Anybody know a good way to replace the seal since nobody sells a cap that works any more?




I know its pricey but you should check out the locking caps Craig sells from time to time. THey seal up pretty good but better is the way the look. Not to appear as a shill or anything but they're worth quite a bit more than I've seen him selling them for IMO.

The other thing... I wish I could help you with, sorry.


____________
-Martin
Orlando, Florida

http://www.themonkeyhouse.org/REPU

'77 REPU (Some assembly required :)
'91 Cabrio (Battered and bruised, but she's still my baby.)

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Klaus43


Rotorhead
Posts: 1259
posted November 16, 2003 09:45 AM

If 'those' caps are the ones...

...like I was able to order from Japan via my dealer's parts dept., after providing specific REPU VIN #'s, they are indeed 'the shit'! Nice, heavy chrome, locking, with an excellent seal... The rubber ring between the filler neck and bed was also available still, at the time...
You might also want/need to replace that section of hose connecting filler neck to tank...

       
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rotormunky


Redlining
Orlando, Florida
Posts: 424
posted November 16, 2003 11:05 AM

quote:
...like I was able to order from Japan via my dealer's parts dept., after providing specific REPU VIN #'s, they are indeed 'the shit'! Nice, heavy chrome, locking, with an excellent seal...



I'm pretty sure we're talking about the same one just by the way you described it. The chrome is really excellent and the unit has a nice heft and solid feel. Not clunky or cheap in the slightest. THe sliding cover over the keyhole is particularly nice.

At the moment its the nicest part of my truck :)


____________
-Martin
Orlando, Florida

http://www.themonkeyhouse.org/REPU

'77 REPU (Some assembly required :)
'91 Cabrio (Battered and bruised, but she's still my baby.)

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Klaus43


Rotorhead
Posts: 1259
posted November 16, 2003 11:21 AM
Edited By: klaus42 on 16 Nov 2003 11:22

Yep, that's it!

I wonder... which plugs are you running, and how hot is/isn't your ignition firing 'em? How long since a complete tune-up? Carb rebuild? Would doing one, followed by a can of Power Foam (AmsOil), followed by 'spirited' driving for a few hundred, including some tankfuls of premium + bottle(s) of Techron do the emissions-passing trick? At the very least, might make you happier with the performance...
Just a thought... 'fresh' everything can't hurt!

       
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Jeff20B


Moderator
Posts: 661
posted November 16, 2003 11:43 AM

He has DLIDFIS. Not sure which plugs he's running. Tom, do you still have a thermal reactor and airpump?
____________
'74 REPU
'76 Cosmo
'77 MG Midget 13B
'81 RX-7

       
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wankel_dreams


Redlining
Posts: 293
posted November 16, 2003 10:23 PM

how many more years do you have to pass emissions?
____________
74 wankel panther
77 REPU
79 rx7
89 Vert

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straightrepu


Redlining
Posts: 232
posted November 17, 2003 02:26 PM

gas cap gasket

Tom send me your addy and I`ll drop one in the mail, I`m sure there is an extra new one in the garage, just have to find it.
____________
74 restorepu

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repujeff


Revvin Up
Posts: 71
posted November 17, 2003 04:15 PM

emissions

To get collector plates in Wisconsin, you have to pass the emissions test. I went 5 or 6 times and flunked every time. I tried the alcohol twice-made the HC numbers worse. I got a waiver for life by spending $450 on emissions related stuff. The last 2 times I went the rotary repair guy at the place where the truck was orig purchased at said that the carb needed to be overhauled and the thermal reactor was bad. A cheap fix is to get a catalytic converter put it in temporary pass the emissions and take it out after. I was told that would be the way to go, but as long as I was spending $450 on other things I got the waiver. I'd say tuneup the carb maybe on the lean side and put in a cat from a junkyard.

       
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brad


Rotorhead
Posts: 1672
posted November 17, 2003 04:46 PM
Edited By: brad on 17 Nov 2003 16:47

quote:

First I failed the gas cap, my seal is horribly cracked. Anybody know a good way to replace the seal since nobody sells a cap that works any more?

Then I failed HC, under load i was at 502 and at idle I was at 548. Both these have a limit of 400. Will alcohol help with HC? Whatever is wrong shouldnt be too bad since it wasnt really that far off.




I have made my own gas cap gasket using plumbing gasket material. Ace hardware sells it for $2.99 for 4"x4"x1/8" sheet...

Put some denatured alcohol in the tank and try it again. U can search http://www.rx7club.com/ for the proper alcohol/fuel ratio and other remedies.


____________
-brad-
74 REPU Lawn Green
81 Rx-7 racecar. 12a J-
Bridge

       
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tom93r1


Redlining
Posts: 458
posted December 08, 2003 03:02 PM

Weird, I forgot about this thread because for some reason replies werent emailed to me. Any way, I did finally get it to pass today and here is my story.
I failed that first time, not too bad just a little as can be seen in the original post. I found a gas cap as I posted in that thread I made about locking gas caps for $20. I adjusted timing a bit and put a gallon of denatured in the tank. After that my idle emissions were nearly non-exixtant for both CO and HC but the 30mph load emissions ended up failing CO and HC, neither was all that bad though, just above the limit. Something like 500ppm on the HC and 5.2% CO. Took the truck home, got ahold of an exhaust analyzer that checks for CO and HC and played with the timing some more and the idle mixture. Also added some fresh gas with no pre-mix oil in it. I think the last time I filled up I may have put in more oil than normal. Got it to where I could pass both idle and load at around 250 for the HC and idle at 2.5% CO and down to 1% about for a high idle.

Now I need to figure out where my timing was at before this whole emissions crap came along. It may be clean now but it runs like crap.


For emissions I am running a 48mm Weber side draft carb and an S4 rx7 air pump plumbed straight into a 3-way cat. Nothing else like EGR and PCV valves to make things complicated. I also do have the DLIDFIS, not sure how much of an effect on emissions that has but I would imagine it could only help to reduce emissions.

Thanks for the help everybody.
____________


'74 lawn-green
4-port 13b
Weber 48DCO
Racing Beat Header
Magnaflow
resonator/amplifier
really loud!

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tom93r1


Redlining
Posts: 458
posted December 08, 2003 03:07 PM

quote:
how many more years do you have to pass emissions?


Damn Arizona emissions laws, I have to take emissions tests as long as teh vehicle is on the road. For anything 1967-80 emissions tests need to be done every single year. No rolling 25 or 30 year window like almost every other state in the nation. On a side note, all motorcycles need to be tested yearly which really pisses me off. I dont think there is another state in the nation that requires motorcycle emissions. Not even the environmental nazis in CA require that plus they have a rolling window so classic cars dont need emissions eventually. Everybody hears about how bad they have it in CA for automotive performance and crap but CA aint got nothing on AZ.
____________


'74 lawn-green
4-port 13b
Weber 48DCO
Racing Beat Header
Magnaflow
resonator/amplifier
really loud!

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ovquick


Redlining
Posts: 253
posted December 08, 2003 05:51 PM

Emissions

The too high hc; assuming the sparks are working correctly and at the proper time, could be bad air pump? any other of the air injection stuff or as and old Mazda hand once told me "too lean", evidently you must have some hydrocarbons to burn in the reactor, this new fuel actually "leans" the mixture by displacing fuel. A newer better exaust system may be causing a lean condition also.
That my guesses for today, may or not be correct!

       
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