I currently own a 1985 Nissan 720 4x4 King Cab with the Z24 engine in it. All stock. Recently bout a couple of years ago, it has an idle problem where if the choke on the carb is all the way open, rpm's drop and kills the engine. So I did some research and most people say it's a bad anti-dieseling solenoid valve. Got a new one, just put it on today, didn't work, problem continued. That valve is supposed to make a clicking sound and I didn't hear any it does however have voltage and resistance though. It's supposed to have 12 volts to the valve to make it click so something is blocking the 12 volts from getting to the valve. Then I noticed that the oil pressure gauge reads zero. Now judging from all this, I'm thinking that the reason why the engine kills under idle AND light throttle is either cause of vacuum leaks or the oil pressure sending unit's shot. That's my guesstimate. If not that, what else could cause it? BTW, I didn't tamper with anything else.
Nissan 720 4x4 King Cab Idle Problems
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Turn ignition on & connect/disconnect plug to check solenoid operation.
Check fuses and earths for power supply problems.
Check vacuum lines for holes/blockages
Is the model with 8 spark plugs?
Paint flames on it. Flames = go faster
1. Yes it has 8 spark plugs.
2. Earths? Are you talking about ground wire? The solenoid reads off 3 volts when it really needs 12 to click.
3. We did the repetitive ignition on/off test and we heard no faint clicking.
4. We did see a little hose with 2 tiny rips down the middle.
What is the voltage from the plug supplying the solenoid? What is the resistance of wire on plug to fusebox?
It sounds like there is a wiring fault (short circuit) dropping voltage to solenoid so you will have to test back to fuse box for continuity/resistance.
forgot picture
The voltage reads off 3 volts. As for the resistance, we didn't check.
And my dad says that it's a pain in the butt to find so he fixed it by raising the idle rpm's up.
If the wire tests good to fusebox, then test across fuse, then check ignition switch - sometimes they can short across positions causing drop in voltage (and potential fire).
9 volts are missing so look to see what other systems are doing strange things/not working, but I have come across similar problems that have been ignition switch.
Check for on/off & voltage on back of ignition switch to see if voltage is correct and switch works properly.
Alleviates the symptoms without fixing the problem