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post #1 of 8 Old Aug 3rd, 2004, 03:15 AM Thread Starter
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Question 86 Pickup Help

Hey all... I've got an early 86 Nissan pickup with the Z24 carbeurated engine. I bought it a few weeks ago, and its a great little truck, except that sometimes it won't idle. It runs down the street just fine, but when the RPMs come down, it won't stay running. Sometimes it will idle just fine, and then after a few minutes, it will start idling real rough, and then die. I'm kinda a 350 small block Chevy kind of guy, so I'm sorta lost. Any ideas? Thanks!
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post #2 of 8 Old Aug 3rd, 2004, 11:34 AM
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Quote:
Originally Posted by Sparky83
Any ideas?
I'm full of em. First check the codes....there is a how to in a Haynes manual or you can search on how to do it on the forum(its been posted many many times). I would then check for a vaccum leak if there was no codes or it still prersisted after you fixed the part causing the trouble code. After that I would go get a set of NGK spark plugs (BPRS5ES) from the zone or any part store after a check of the plugs in the engine(replace if they are Bosch or appear old, fouled or worn.) Then replace the air and fuel filters. Lastly if that doesn't work, check the fuel pressure and make sure its correct.

88 Nissan Hardbody V6 4X4 off-road rig.

Bosch spark plugs are the leading cause of ignition problems on NF!!!!!!!!!! When will you all learn????????? :mad:
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post #3 of 8 Old Aug 3rd, 2004, 12:22 PM
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I would check the idle control system. Different manufacturers call them different things (as do shadetree mechanics). Idle load compensator, idle speed control, idle speed motor, idle stop solenoid, throttle kicker, etc. Basically, they all work the same. It's a small plunger that will extend and retract, against the throttle, to increase or decrease the throttle opening based on engine load. For example (on my '95), when the A/C cuts on, the idle control system will increase engine idle from about 700 to about 900, to keep the engine idle smooth. When the A/C cuts back off, the idle drops back to around 650-700. This can be controlled by electronic means (signals from the computer), by manifold vacuum, or by both. If your truck won't idle, and you've discounted other tune-up items first (like plugs, wires, rotor, cap, spark timing), check the idle control system to see if it's working properly.

Jason Adcock
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1995 4x4 XE King Cab - 189,000 miles
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post #4 of 8 Old Aug 3rd, 2004, 04:30 PM Thread Starter
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I've already done plugs and plug wires, changed the oil, new filters. I've got a Chilton manual, but I can't find in it anything about the computer. Where is the port at to check for engine codes?
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post #5 of 8 Old Aug 3rd, 2004, 07:05 PM
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Quote:
Originally Posted by Sparky83
I've got a Chilton manual, but I can't find in it anything about the computer. Where is the port at to check for engine codes?
There is no port and the Chiltons manual sucks big time........... you can look in the sticky at the top of the forum and find how to check the codes from tolleys post. Your computer is located underneath the passengers seat (which will need to be removed to access it). I suggest you buy a Haynes manual or find a FSM on ebay for your model! If you need any more info you know where to find us!!!!!

88 Nissan Hardbody V6 4X4 off-road rig.

Bosch spark plugs are the leading cause of ignition problems on NF!!!!!!!!!! When will you all learn????????? :mad:
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post #6 of 8 Old Aug 7th, 2004, 10:58 PM Thread Starter
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Okay guys, I tried using those instructions on how to check codes, but I've got a few problems. First, the unit is under the driver seat, not the passenger seat. Second, there are no switches or dials on it. It has one green LED, and thats it. Does anyone know if I'm just doing something wrong, or whats up? My pickup is an early 86, the one that still looks like the 85's...
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post #7 of 8 Old Aug 7th, 2004, 11:37 PM
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You can't check the codes ,well, because its not an 86.5 pickup....I should have read the post more carefully. Your truck doesn't use the ECCS to operate and monitor the engines performance. I would check for an intake manifold leak and vaccum leaks. If it uses alot of gas, you may want to check the air/fuel mixture in the carb. Also clean the carb real good to remove any buildup. Eliminating the cheap and free stuff is usually the best way to diagnose driveability problems. Try those out and get back to me.

88 Nissan Hardbody V6 4X4 off-road rig.

Bosch spark plugs are the leading cause of ignition problems on NF!!!!!!!!!! When will you all learn????????? :mad:
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post #8 of 8 Old Aug 10th, 2004, 10:06 PM Thread Starter
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I checked and cannot find a vacuum leak anywhere. And I figured if it was a vacuum leak, it would do it all the time, not just sporadically. It doesn't use alot of gas, still gets 30mpg. I've changed the oil, air filter, fuel filter, plugs, wires... My only guess is that its something to do with the emissions controls. Any ideas? And by the way, what is the curb weight for my truck? I see that the GVWR is like 4400, but I can't find anywhere what the actual weight of the truck is. Thanks again for all the help...
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