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Old 02-14-2011, 12:03 PM   #1 (permalink)
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Default Sputter at 40mph @3200rpm

Does anyone have a clue why my Sami would sputter at 40mph at around 3200rpm? It gets there fine, but then I want to give it a little more gas and it starts sputtering until I let up. Eventually it picks up speed and I can get into 5th.

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Sabine
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Old 02-14-2011, 11:06 PM   #2 (permalink)
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what year is your rig? If carbureted, maybe your secondary isn't opening?
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Old 02-14-2011, 11:30 PM   #3 (permalink)
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1987... and yes it is carborated. The carb was just rebuilt, but with older things being what they are... Although, it does this all the time, not just when the car is cold. Can you give me a brief description on how to check for the secondary?

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Old 02-15-2011, 07:07 PM   #4 (permalink)
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the secondary throttle plate is activated by a micro switch on a vaccum switching valve. the VSV for the secondary is on engine side of the carburetor towards the front of the carb. It has a boxy electrical connector plugged into it, and it has 2 vacuum lines going to it. one line goes to a round daiphragm that actuates the secondary linkages, the other vacuum line off of the VSV goes to a "T" fitting that branches one line to the throttle body and the other line to a round vacuum transmitting canister and then back to the other port on the diaphragm for the secondary. If you engage wide open throttle, with the engine off but the ignition switch in the on position. you should be able to hear an audible click from the electrical switch in the VSV. When the engine is running and you engage WOT then you should be able to see the linkages on the front side of the carburetor for the secondary throttle plate moving and opening it up.
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Old 02-15-2011, 07:28 PM   #5 (permalink)
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Cool, thank you, I will check that. You could well be right, the car had no VSV when we brought it, most of that stuff was gutted out. We couldn't find a new one, so we went to the junkyard, and got what we believe to be one. Could be we got the wrong thing. I hate to ask you this, but you wouldn't happen to have a picture of one? Short of that a place to get one that wont break the bank?

Thanks
Sabine

P.S. You're not talking about the EGR, are you? That actually works fine, it was about the only thing that did work.

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Old 02-15-2011, 07:59 PM   #6 (permalink)
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no, not the egr. The diaphragm for the secondary is actually part of the carb. The EGR modulator and it's VSV are bolted on a bracket that kind of hangs off the back of the carb. The vsv, vacuum transmitting valve, and vacuum delay valve that are down the side of the carburetor are parts that will run you about 100 bucks if you buy them new.

You can get them at a scrap yard or pick and pull for about 5 bucks and they'll probably work just fine. Mine are 20 years old and they still function and will pass california emissions testing.

diagram from acks faq



this next image shows the secondary diaphragm and the VSV over it... you can also see some of the hoses and valves in the background

vacuum lines, left side of carb by GeoB, on Flickr

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Old 02-16-2011, 11:36 AM   #7 (permalink)
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Don't take this the wrong way.... BUT I LOVE YOU. Awesome. This I can do.
Thanks so much!!!! You really think that I can just steal one from any carburated car?

I actually passed CA emmisions clean. It just never had to go over 35 to do so.

Sabine
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Old 02-16-2011, 01:26 PM   #8 (permalink)
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well not from ANY carbureted car... It most likely has to be a samurai to have the correct parts so that the air is metered correctly... I honestly don't know of any other vehicle that uses this particular hitachi carb. I do know that there are lots of parts in the scrap yards for them. Call around to local wrecking yards and see if you can find one. Down here in San Diego the yards are all networked via CB radio, so they will broadcast the parts request if they don't have it and another yard that does will respond to the querry.
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Old 02-16-2011, 03:51 PM   #9 (permalink)
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Lucky you! Here at the edge of noWhere (Lancaster), it's catch as you catch can.
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