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Author Topic: 78 Merc Bobcat 2.3l spark delay valve  (Read 1362 times)

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boughtabobcat

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78 Merc Bobcat 2.3l spark delay valve
« on: June 01, 2014, 05:52:46 PM »
Okay group, my latest question - after getting all the vacuum lines routed and replaced on my 2.3 (w/ac), and getting everything running fairly well around town, I took it on the highway for a short trip today and noticed a substantial bog on acceleration when getting on/off the highway. I noted in the vacuum diagrams that I referred to when routing the lines that there was a spark delay valve pictured, of which I have none! Yikes! Therein would be the problem, I figger! Lol!! My question is this- which spark delay valve/vacuum delay valve do I need? I can find several, but what's the one I need for my Dragon Wagon? (i.e. DSV8, DSV10, etc.) Any help would be appreciated, cause I guess having the wrong one will make the car run badly.....

Offline amc49

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Re: 78 Merc Bobcat 2.3l spark delay valve
« Reply #1 on: June 01, 2014, 10:09:30 PM »
Not that simple. Where EXACTLY does the diagram place the delay valve, between what and what? Generally HAVING the delay valve causes a bog problem not cures. Commonly put in spark advance vacuum line, if there it slows advance down and the bog if anything will be worse. Used to stop pinging (timing advancing too fast).

There are other oddball places where they can go, the exact location would determine if you get better or worse without it.

boughtabobcat

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Re: 78 Merc Bobcat 2.3l spark delay valve
« Reply #2 on: June 02, 2014, 12:05:05 AM »
Well, according to the diagram, it goes between the spark port coming off the carb and the distributor. The car runs okay in town where I never have to go more than about 35 and don't have to accelerate quickly, but getting onto the highway it honestly takes 20 seconds to get from 30 to 65, which becomes a safety issue...

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Re: 78 Merc Bobcat 2.3l spark delay valve
« Reply #3 on: June 02, 2014, 03:53:01 PM »
Having the delay there will not help your issue at all. Not that. Something much more wrong to slow you down that much, you're missing a good chunk of power there. While these are not power hogs you should be able to get there in half that time.

FYI, the number attached to part # is most likely the delay in seconds, they used to be color coded for it.