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Welcome To Smog Hell: The Mid-80s CVCC Engine

Now I love the third-generation Honda Civic. At this point I have owned at least a half-dozen '84-'87 Civics; they're quick, soldier on for 300,000+ hassle-free miles, and parts are easy to find. But I will never own another carbureted 3G Civic, not since the Smog Overlords imposed the dyno-based Smog II testing standard on Northern California. The CVCC engine, with its double combustion chambers, requires thee most complicated rat's nest of vacuum hoses, solenoids, dashpots, and sensors I've ever had the misfortune to tear into (see the underhood sticker in the photo, above; that's a simplified diagram for an '85 Civic), in order to make the car meet emissions standards. And if any component of the rat's nest is leaking or malfunctioning, the car will fail the smog check, and woe be upon the sucker who attempts to locate the problem (is it the sensor that tells the computer the car is above 6,000 feet? the one that detects half-throttle deceleration in third gear? the one that checks for unusual sunspot activity?).

How Do I Get My Gross Polluter Certified? [California Bureau of Auto Repair]

Related:
Just Buy a Honda and Get it Over With: A Jalopnik Lovefest [internal]

8:43 AM on Mon Feb 19 2007
By Murilee Martin
2,648 views
23 comments

Comments

  • Why wouldn't an old car like that grandfather through those tests? Here in Tejas, the oil wonderland, cars over 20 years don't need emissions testing. They're classics.
    ~CR

  • It's either 25 or 30 years in California, Bob. And a mid-eighties civic is emphatically not a classic.

  • Hey, at least they didn't require a pesky catalytic converter. I don't know if that's an engineering feat or not.

    My brother had a CVCC Civic. That car was such a blast to drive.

  • Please. That's nothing compared to the mess of vacuum hardware required to actuate the twin turbos of the 3rd Gen RX-7.

  • I'll 2nd that Starkeshia....after replacing all 168 vaccuum lines with silicone hoses, taking 35 feet of 3.5mm and 10 feet of 6mm, I know the true pain it is to do anything under the hood of a 3rd gen RX-7.

  • This diagram, and the thought of working on that makes me want to shoot puppies.

  • It WAS a rolling 30-year exermption in California, but the doo-gooders in the Legislature changed it a couple of years ago to be pre-1975 only exempt from SmogCheck.

  • Word on the street is you can just dump in octane booster, there are a whole lot of cheeter ways to do it up here in IL (but our rollers are going away soon)

    ....and Starkeshia, all that that little guy requires to control boost is a vacuum line to each wastegate and a source... looks pretty simple to me. Did you get the neon blue hose Sivart_R1?

    Love you guys

  • Oh my God, scotte, that's horrible. Seriously. Awful.

    Stupid liberal tree huggers...

  • or, more appropriately stupid liberal tree huggers. roflcopter.

  • imoody, that's how it is up here in Oregon, too. Pre-1975 are exempt, everyone else has to go through.

    That's why you always keep a friend who lives in a non-DEQ area, and register cars out at his place.

    Not that I'd do that. Or have. Or will again.

    As a side note, they got rid of the rollers up here, too, and now just do the simple tailpipe test at idle.

  • The first CVCC Hondas were able to run clean enough to skip the catalytic converters, but the third-generation Civics definitely had them. The reason for the hellishly complicated tangle of hoses and devices is that the 3G Civic had what was in effect a double fuel-delivery system (one for the extra-rich initial combustion chamber and another for the lean main combustion chamber). What happened with Smog II is that, in addition to the test changing from a high/low idle deal to a dynomometer-based load test, the HC/CO/NOx standard was tightened up to the same standards the manufacturer had to meet when the car was new (previously the standards were a bit more slack). EFI cars can usually pass, no problem, but computer-carb cars... ai-ya!

    All that said, I'm not opposed to smog-control gear and inspections per se; anyone who experienced SoCal air even 20 years ago can tell you there's been a huge improvement. The problem I have is that massive sources of smog (and I'm referring to combustion byproducts not including carbon dioxide, which is a whole different debate) emitted by untouchable-by-Sacto sources in California are essentially unregulated (all those stationary gasoline-powered water pumps in the Central Valley, for example, not to mention the burning fields after harvest), while car drivers face ever-more Draconian restrictions.

  • Stark: Holy crap, the turbo RX-7 does look even worse. But like I said, the underhood sticker is a simplified version of the 3G Civic nightmare; reality is far more frightening.
    Now, the 3G Si Civics are a totally different story- nice simple EFI with minimal Rube Goldberg crap. Damn, now I want an '87 CRX Si...

  • If the thing fails the emissions test, just put it on Ebay and sell it to somebody outside of California. Lots of people would love a relatively rust-free Japanese subcompact capable of 50 mpg. You'd be surprised what some people would pay for that.

  • Image of danio3834 danio3834 at 12:33 PM on 02/19/07 *

    Thankfully these nightmares are nearly all exempt here in Ontario. Notable nightmares are:

    Ford's variable venturi and CFI

    Chevy's electronic feedback Quadrajet

    Chrysler's lean burn

    and any carbureted 80's Jap with wires

    Thank fully most of these I encounter either go straight carb or straight EFI

  • Image of danio3834 danio3834 at 12:34 PM on 02/19/07 *

    50 mpg downhill in a tail wind

  • If they last so long, why have you been through six or more in under 25 years?

  • The mid-80s were sort of the smog-hardware perfect storm- you had fairly strict emissions requirements but most cars still had carburetors.

  • I too love the third-generation Honda Civic, the most beautiful city car ever sold in the USA, especially the 1500 S I owned. 12.5 feet of urbane urban perfection.

  • I once helped a friend get his CVCC through DEQ here in OR. Basically had to replace all the hoses one by one, the rubber was old and cracking. Thank god all the hardware still worked. I think that was the last "freebie" repair I did for anyone.

    The PGM-FI 86 integra which was my wife's first car, was a dream compared to that. It's distributor only sawed itself in two from the inside after one of the mech advance counterweight springs broke. Easy enough to throw a new one on, only trouble we had with the 220k mile beast.

  • it's amazing that honda decided that was easier/cheaper than the EFI system they already had?

  • Oh wow that brings back memories of HS auto shop. We had an 84 Civic come in with a popped headgasket, that ended up being pretty simple to fix on a budget, the head hadn't warped that much so it was just resurfaced and stuck back on. All in all disassembily to attaching the last bolt took maybe an 8 hour workign day. Tracing down every vacum line and connecting it to the correct nipple? 2 weeks.

  • Is it at all possible, that this is the reason why so many US-market cars could only manage 170 horsepower from a 350ci v8? Makes me cringe.

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