85-720-caliemissons Posted December 10, 2015 Report Share Posted December 10, 2015 i have a 1985 nissan 720 with the z24 engine. I purchased the truck recently with the head off for a blown head gasket it was already disassembled. I had head machined put the head back on it going to junkyard today to get the intake manifold bolts i was missing and a couple timing cover bolts. It has the eletronic feedback carburator "has o2 sensor" im wondering what kinda issues im gonna run into with this carb? can i delete all vacumn except vacumn advance like a federal emissions truck any feed back would be appeciated.. im kinda on a budget with it. thanks 1 Quote Link to comment
datzenmike Posted December 10, 2015 Report Share Posted December 10, 2015 The round electrical plug at the back is problematic, or I shoulr day the wires can be. Nissan made them too short ans every time they are moved it increases the chance of one breaking internally. The ECU needs input from the carb sensor so if it starts acting up try wiggling the wires. Terrible gas mileage is an indication that the system has reverted to the 'limp home' position when there is a problem. This forces a programmed rich mixture and prevents the possibility of a severe lean condition that could harm the engine when a problem occurs. The ECU (I think under the driver's seat) has a diagnostic mode setting and a red and a green LED that flash a code to indicate any fault conditions. (like a faulty O2 sensor) 2 Quote Link to comment
85-720-caliemissons Posted December 10, 2015 Author Report Share Posted December 10, 2015 ok i apreciate the information. can i unhook the vacumn like a federal? 1 Quote Link to comment
85-720-caliemissons Posted December 10, 2015 Author Report Share Posted December 10, 2015 because mine has a mess of broke vacumn lines 1 Quote Link to comment
datzenmike Posted December 10, 2015 Report Share Posted December 10, 2015 There is California and Federal emissions. If you are not in California and the truck is not from California... it's already Federal. Just buy tubing and replace? The diagram is on a sticker on the underside the hood. Some of those hoses contribute to better mileage and smoother running. 1 Quote Link to comment
Lockleaf Posted December 11, 2015 Report Share Posted December 11, 2015 Shaving everything vacuum from the engine will help you only in one way. It's easier to assemble. If your carb is in good condition, then replacing all the vacuum lines will allow everything to do its job. You will run cleaner, and get the best gas mileage available. Deleting them only serves a real purpose if switching to a carb that doesnt need or use all those controls. 1 Quote Link to comment
85-720-caliemissons Posted December 11, 2015 Author Report Share Posted December 11, 2015 ok. my thing was i couldnt find a diagram for a 85 the chilton book doesnt have one for a 85 it has 84 with regular carb and 86 tbi 1 Quote Link to comment
85-720-caliemissons Posted December 11, 2015 Author Report Share Posted December 11, 2015 mine apears to have a certa fit hood no factory sticker or liner 1 Quote Link to comment
datzenmike Posted December 11, 2015 Report Share Posted December 11, 2015 Yes the Chilton's and Haynes are not much use as they cover 6 years of 720 and can't cover everything useless. The best is the Nissan (factory service manual) Next best thing is to remove them one at a time and replace. 1 Quote Link to comment
Lockleaf Posted December 11, 2015 Report Share Posted December 11, 2015 Or ask us for a pic of one from an 85 1 Quote Link to comment
datzenmike Posted December 12, 2015 Report Share Posted December 12, 2015 You would need a dozen pictures, very complex. 1 Quote Link to comment
Lockleaf Posted December 12, 2015 Report Share Posted December 12, 2015 Of the vacuum diagram I mean 1 Quote Link to comment
85-720-caliemissons Posted December 12, 2015 Author Report Share Posted December 12, 2015 Can one of y'all send me a vacuumn diagram for it Quote Link to comment
85-720-caliemissons Posted December 17, 2015 Author Report Share Posted December 17, 2015 It's up and running couldn't get vacumn right. So I capped everything but vacumn advance power brakes and to eletric solinoid things that had full manifold vacuum its running pretty good Quote Link to comment
datzenmike Posted December 17, 2015 Report Share Posted December 17, 2015 The two solenoid electric things are Fuel shut off and Dual Plug shut off. Quote Link to comment
85-720-caliemissons Posted December 18, 2015 Author Report Share Posted December 18, 2015 Ok. Thanks that's good to know I'm knew to these Nissans so any help is good help Quote Link to comment
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