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D21

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Question
Truck won't start unless I remove the fuel pump relay
Hey there. This is a sign of a failing fuel pump or potentially a faulty power connection to the fuel pump. As you know, if the fuel pump fails to supply adequate fuel pressure to the motor, this will cause...
Question
Truck makes drumming sounds at the back
Hello. This could be a differential or driveline issue. You state the noise is momentary which rules out a lot of common issues such as tire defects and wheel bearings. Chassis ears would pinpoint the source of the noise. If...
Question
Brake lines have air, bled many times
Hello. Moisture in the brake fluid is being boiled off as steam when your brake system temperature gets above 212 degrees (at sea level). The steam re-condenses as water in the system BUT air pockets can be created and remain...
Question
Manual transmission makes noises - 1994 Nissan D21
Hello. It sounds like you have a gear, bearing, bushing, or other rotating component issue caused by wear. At that mileage, really the thing to do is just simply rebuild the transmission which is not particularly difficult since it is...
Question
Truck is running rough, loses power, backfiring noise - 1994 Nissan D21
Hey there. I would check fuel pump output and condition of fuel injectors (flow rate and solenoid resistance). After that, I would evaluate the ignition system, including distributor, plug wires, timing. If you would like to have this checked for...
Question
After overhaul my Ka24 d21 doesn't rev pass 4000 rpm
Hi there. From the description you have provided, I'm not sure running a recently overhauled engine over 4,000 rpm is a good idea. There is a 500 mile break-in period recommended by most rebuilders. Change the engine oil and filter...
Question
My 89 Nissan will not crank, My starter is OK
Before you put a lot of time into this, you need to make sure the engine is not locked up. Get a wrench on the front of the crankshaft and turn the engine through at least two revolutions. It will...
Question
Sputtering/not starting when hot?
Hi there: Usually when a vehicle is sputtering and hard to start and accelerate; it's typically an indication of either a vacuum leak, air fuel ratio issues or an obstruction in the fuel flow. Believe it or not, most of...
Question
High idle problem.
This may be a sign of a vacuum leak. A vacuum leak can be one of the most frustrating and difficult problems to diagnose. High idle speed is a common sign and stalling is another. Confirmation of an engine vacuum...
Question
How do I lean down the fuel
This may be related to many different things such as faulty or leaking fuel injectors causing the cylinders to be loaded with more fuel than what they can burn efficiently. This may also be related to a faulty mass air...
Question
Will not start - 1994 Nissan D21
Hello. Considering the circumstances, it may be wise to take a few steps back to the very basics and do a few tests that may seem redundant. Starting issues are typically simple in nature or an electrical issue. Spray some...
Question
The clutch lever that the slave cylinder pushes is not pushing/springing back
It sounds like you may have to replace the clutch. Clutches can fail in a number of different ways and exhibit a multitude of symptoms. Most people are acquainted with clutches that slip from simple wear, but it sounds like...
Question
My car won't shift into 3rd, 4th, and reverse.
Hi there. The gears 3rd and 4th are both on the main shaft inside the transmission. Those gears have a synchronizer that connects the gears together. The reverse gear does not have a synchronizer to make the gear work. It...
Question
Ignition timing out of sequence.
Hi there. First you would need to know the firing order for the electronics on the distributor. The distributor number one on the firing order is the terminal on the right side at the front of the vehicle. Since you...
Question
nissan d21 pickup 2.4ltr no 2 cylinder mot firing
Hi there. How did you determine that cylinder 2 is misfiring? Is there a check engine light on with a stored code? What is the code? Have you checked the compression on the other cylinders? A cylinder leak down test?...
Question
93 Nissan will start but have to stay on gas to keep running
Hi there. In most cases, what you are describing is caused by an over rich situation (meaning the engine is getting too much fuel and not enough air). This can be caused by a damaged mass air flow sensor, O2...
Question
Can't get past 3,000 RPMs in any gear. Starts jumping when it hits 3,000. Wondering what would cause that.
The first step to diagnosing a suspected fuel delivery issue is to check the fuel pressure. The manufacturer has set a specification for what the fuel pressure should be. If the fuel pressure is lower than what the manufacturer recommends,...
Question
My 1993 Nissan pickup is idling very rough, and rich has almost a deep gurgling when hitting the gas but no power. I have replaced
Hi there. You've listed most of the "usual suspects" of a rough idle, except for trying to isolate a potential vacuum leak. In most cases, a vacuum leak will cause a very rough idle and sometimes misfiring. You might want...
Question
Truck starts then dies
Hi There, A few different things will usually cause the vehicle to start and then die. A bad ignition coil can cause this if it is beginning to fail, resulting in intermittent starting problems. A dirty or faulty mass air...
Question
How do I remove heater core in a 1994 nissan pickup
Hello, thank you for writing in. The heater core is a difficult component to get to. Typically, you must go through a lengthy process of accessing the core from behind the dash. Once you have access to it, you can...

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