1993 Pathy died and wont start.

A forum for the legendary Nissan Pathfinder and Infiniti QX4.
baschmerm
Posts: 6
Joined: Sat May 01, 2010 3:58 pm
Car: 1993 Nissan Pathfinder SE
3.0L , Standard

Post

I bought a 93 pathy about a month ago. A few days ago I went out for a fast food lunch while working and on my way back
It started bucking and died. I've had this bucking happen before but it never died until now. I have power going to the fuel pump, a new fuel filter, and new fuel pump relay, and all my fuses seem to be fine. When I try to start it, it will crank over good and strong, but no start. If i leave the key on, I can hear and feel the fuel pump relay clicking. If I unplug the relay I can here clicking coming from some kind of solenoid underneath the intake manifold near the firewall. My Dad and i did some tinkering and were able to get the fuel pump to run after pulling fuses and putting them back but still no start. After we tried to start it once the pump was running it would go back to the clicking relay and other thinger. I have spark and there is half tank of fuel. Fully charged battery. i dont know what other info i can provide.
Any help would be greatly appreciated!!!to


baschmerm
Posts: 6
Joined: Sat May 01, 2010 3:58 pm
Car: 1993 Nissan Pathfinder SE
3.0L , Standard

Post

So i went out and bought a code reader kit, which apparently i didnt even need cause all I use out of it is a little plastic screwdriver. Shoulda researched a little more. Anyways, i followed the instructions but instead of blinking a few red then a few green, the red LED blinks in time with the clicking going on. Is my ecu fried? or grounding somewhere i cant find? Help!!

alexf20c
Posts: 524
Joined: Sun Nov 27, 2005 6:59 am
Car: '00 SE 4x4

Post

how many miles? does the motor seem to crank over much faster than usual? if yes, then your timing belt may have let go. if that's the case, your motor is toast as the valves probably contacted the pistons, causing serious damage.

how did you check for spark? if you simply removed a spark plug, and grounded it to the block and looked for spark, that doesn't guaranty a good ignition system. with our primitive and antiquated distributor design, it's not uncommon for the distributor cap to develop a short or cross-short within its own contact points. for example, it will send the spark to cylinders #2 and #6 instead of #3. in this scenario, your method will still show spark, but there is no way to verify it is going to the right cylinder.

a distributor cap is inexpensive and a regular maintenance item, so i suggest replacing it as well.

now will also be a good time to replace your spark plugs. after cranking and cranking and cranking with good fuel and no spark, your cylinders are in doubt supersaturated in fuel. your plugs will be fouled and if they are old and worn out, they will be incapable of burning off the raw liquid fuel which has accumulated in the cylinders. bad spark plugs can definitely cause a no-start even after the initial problem has been repaired, simply for the reason above.

baschmerm
Posts: 6
Joined: Sat May 01, 2010 3:58 pm
Car: 1993 Nissan Pathfinder SE
3.0L , Standard

Post

well i got it to run by using a test light on a wire going to the ecu. the ecu is getting i think 3V to it. im just trying to find
out which wire it is. also, my ecu isnt putting out signal to certain components (fuel pump, injectors, etc.).
I pulled my plugs and they're perfectly dry which supports my theory on lack of signals. they were also replaced about 20K ago with wires. timing belt should be fine since it ran but looking at it i think its time to replace. so unless its because of
lack of power to the ecu, then im leaning towards my ecu being toast.
Im hopin to get it going soon i've got a 4x4 trip planned.

baschmerm
Posts: 6
Joined: Sat May 01, 2010 3:58 pm
Car: 1993 Nissan Pathfinder SE
3.0L , Standard

Post

its the power wire getting 3V to the ECU. could low power make it send incorrect signals

baschmerm
Posts: 6
Joined: Sat May 01, 2010 3:58 pm
Car: 1993 Nissan Pathfinder SE
3.0L , Standard

Post

k so it runs now. no more ticking or flashing. but now it has no power.if i ease into the gas it runs okay. if i floor it it bogs down and almost dies. for some reason its overfueling itself bigtime. 200 km to a tank. unplugging the maf does nothing to help. had loose connection on ignition coil and repaired it. checked dist. cap, nothing obviously wrong. pulled plugs, totally covered in black s""". black smoke from exhaust, etc.
im not sure what to do next. Help?

baschmerm
Posts: 6
Joined: Sat May 01, 2010 3:58 pm
Car: 1993 Nissan Pathfinder SE
3.0L , Standard

Post

no one has any insight on this??


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