1991 Nissan Maxima - Answered Questions & Fixed issues

check out both (output and input speed sensors), as well as (both connectors); do this first. Next, remove instrument cluster, and replace coil-spring that operates speedometer needle ( has tendancy to go back at anytime).

-Have you connect all electrical lines to all injectors...? -If yes. all are connected then do the following test: -Disable the fuel pump by removing the fuel pump fuse. -Disconnect all electrical line from the injectors. -Use noid light tester to connect to each line then crank about 2-3 seconds to see any light. Do one after the others to all 6. -If all lines have light then now remove all spark plug, leave it open then crank the engine for 6-7 time to clear all gas inside. -install plug back into. connect all injector line. Now start. You should be good to go. Good luck Mai

Check for any air leaks between the mass airflow meter and the engine like the rubber being split on the air intake boots etc.. I once had a toyota that would do the same thing and the fix for that was to flush the coolant passages in the throttle body, worth a try. Also you said you replaced the TPS. If the TPS has slotted holes you must set the minimum TPS volts or that can also cause idling issues. Clean the throttle body as well.

while clicking is happening place your hand on the heater blower motor and you will feel it coming from there. change the blower fan.

1991 Nissan/Datsun Maxima 3.0L FI SOHC 6cyl

The Coolant Temperature Sensoris located:

Under hood, center, front engine area, mounted in driver side front of cylinder head.Here's a link to what it look's like.

Duralast Coolant Temperature Sensor SU405 Read Reviews on Duralast SU405

There is no way to know what happened without hands on inspection and testing.

HERE'S A VIDEO ON CHANGING YOUR FLUID,HE SAYS A 19 MM SOCKET FITS, Nissan Maxima Infiniti Automatic Transmission Fluid Change

There is usually a dimmer switch for the dash lights near the left side of the dash behind the steering wheel. Sometimes that can get bumped when you get in the car and turn the dash lights completely off.

If the starter works and there is no spark at the ignition coil, replace it. Check your center electrode wire too. A new distributor cap and rotor may be in order as well. If that doesn't fix it, your distributor is shot.

you have a transmission problem your forward clutches may have to change,did you check the shift cable by the neutral switch if all those area check ok the transmission have to be repaired

Pull the bulb back out and look in the plug. They get corroded and the tabs will spread apart and/ or break off. Bend them back if they are there, replace it , if not.. If it looks good, you need to use an ohm meter and check continuity of the tabs to the wire. They usually break close to the plugs.

If dealer will not provide, there are books available which have nothing but vacuum diagrams. FYI, most newer cars have basic vacuum diagrams on a sticker somewhere under the hood. Dirt often prevents one from seeing it.

Don't attempt it. It is not for the DIYer. There are very detailed procedures to follow and getting the timing right is is tricky. If you do attempt it buy a good manual and follow it closely.

Remove the lamp housing to get to them, if you can not see & reach from under the hood

major mechanical job, best advice i can give is get a good workshop manual for your vehicle as this will explain step by step . It would take me ,and others , hours to type the info you need here, you will also need some specialist tools , engine hoist etc, good luck and keep me posted if you wish

IAC sensor could be bad.

timing is off a little turn distributer a hair if it gets worse go the other way maybe injector cleaner in gas tank

Best guess is O2 sensor is reading too much unburned fue in the exhaust for some reason and leaning out the fuel flow to compensate. Runs when you throw more throttle at it but leans out as you try to hold steady speed. Should throw a code though.

most older over seas cars it will the only way to find out for sure is call a dearer and ask about a timing belt and if its an interference motor

Have someone in the car when you lock it from outside. The person that is inside needs to unlock the car for you. This deactivates the anti theft and it should start. Let me know if this works.