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Old 01-12-2020, 04:31 AM   #1
Ptorres
 
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Question 1986 d21 cuts out at 2000-2500 rpm idles smoothly.

Hello. I just purchased my first hardbody pickup. It has the z24i. It was very cheap however it has an issue with it cutting out when the engine is around 2500 3000 rpm (truck is base so no tach). I pulled a plug and it looked like the truck was running lean. I can hear the fuel pump prime I replaced the fuel filter, truck has new cap, rotor, plugs and wires. I checked timing I also made sure the oil pump shaft was correct everything checked out well. Truck is currently at 5 btdc. Truck doesnt over heat. The gauge actually goes up 1/8 of the way however it's enough to blow hot air from the vents. No smoke from exhuast. I checked for vac leaks and found the TBI bottom hose was cracked replaced it but made no difference. The last thing I did was with the engine running I pulled the air cleaner off truck started to stumble a bit my guess is this is normal. However I'm not really sure. I blew on the air temperature switch and the truck just died. Could this be the issue? I have read alot of simular problems with d21 with this engine configuration however never any fix. I would definitely love to figure this one out. Truck rides so smooth and has a clean interior I really like it I just want to make it run correct. Any help is appreciated thank you!

Last edited by Ptorres; 01-12-2020 at 04:37 AM.
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Old 01-17-2020, 06:08 AM   #2
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Update: I checked compression 180 175 180 175. Everything looks good there. I have found a parts truck. I will start to flip parts around and see what fixes it. Will update when I find the solution to the problem.
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Old 01-17-2020, 12:04 PM   #3
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Quote:
Originally Posted by Ptorres View Post
Hello. I just purchased my first hardbody pickup. It has the z24i. It was very cheap however it has an issue with it cutting out when the engine is around 2500 3000 rpm (truck is base so no tach). I pulled a plug and it looked like the truck was running lean. I can hear the fuel pump prime I replaced the fuel filter, truck has new cap, rotor, plugs and wires. I checked timing I also made sure the oil pump shaft was correct everything checked out well. Truck is currently at 5 btdc. Truck doesnt over heat. The gauge actually goes up 1/8 of the way however it's enough to blow hot air from the vents. No smoke from exhuast. I checked for vac leaks and found the TBI bottom hose was cracked replaced it but made no difference. The last thing I did was with the engine running I pulled the air cleaner off truck started to stumble a bit my guess is this is normal. However I'm not really sure. I blew on the air temperature switch and the truck just died. Could this be the issue? I have read alot of simular problems with d21 with this engine configuration however never any fix. I would definitely love to figure this one out. Truck rides so smooth and has a clean interior I really like it I just want to make it run correct. Any help is appreciated thank you!
Try the mass air flow sensor. Should be in line between the air filter box and intake manifold. I had an 89 with a the same issue. I bought a can of maf sensor cleaner and cleaned it per directions on the can. It helped it alot. Didn't completely fix it but it was a rough work truck and I didn't wanna spend the money on a new sensor. So I just cleaned it periodically. Be very careful not to damage the filaments on it when you remove it, try not to even touch them. Hope this helps
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Old 01-18-2020, 02:32 AM   #4
cadillacdude1975
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Have you checked for any stored trouble codes?
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Old 01-31-2020, 04:23 PM   #5
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Check the coils for sure. My 89 had a bad intake coil and it would do exactly what yours is doing. Swapped the coils around and its runs great
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Old 01-31-2020, 05:27 PM   #6
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Nissan built a fail safe system, called the "Fail Safe System" -lol- into the Electronic Computer Control System (ECCS) of the early D21 and pathfinders. Probably the later models also but I only have knowedge of the 80's trucks. Anyhow, the computer will limit engine rpms to 2800 when one or both of two conditions exist:

1. Air Flow Meter malfunctioning
2. Injector malfunctioning

So that should narrow it down quite a bit for you. Like was said earlier, you need to run codes off the computer beneath the pass side seat to see what's been stored in the ECCS. Should be a sticky somewhere on one of these forums that will walk you through the process of reading codes correctly.

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