need some mechanic advice and help

[matt]

my buddy ( it is actually the silver 2tone coupe that I used to own)
we can not figure out whats wrong with his car, I havnt spent too much time on it,but it is like pouring fuel into the cylanders, and missing, and smoking
( damn near pure fuel, it reeks).
but only when under load, it will free rev just fine.
i dont remember if he checked the fuel pressure but he tried a new fpr, injector O rings, and looking around for obvious vacuum leaks,
now I know for the last year or 2 he hasnt ran a 02 sensor on it.
bc the aftermarket header made the sensor rub on the firewall, and wore the wire in half, it always seemed to run fine, we pulled into a gas station and BOOM out of no where just starting spewing out fuel smoke, and was missing really bad, but it will turn over and fire up instantly..
my thought were to maybe suspect the fuel pump, possibly the MAF,
and do you think that just out of no where the car would run funny bc of not having the 0s sensor on? it was fine for along time.
so I thought If I could find a ECU cheap enought to just try that.
I actually have a brand new bosch 02 sensor at my house, I might just throw it on there to rule that out.

any advice or thoughts..
( it is a 89 sohc ka24e)

[Js04sILVerBullet]

I know from my expierence on my old 87 GT i had just put LT headers on it and didn't get around to putting the o2 sensors in right away and that thing ran really rich and when i would get on it, it would backfire really bad sometimes.

once i got the o2 sensors on it was a night/day difference

but your buddy's car might be completely different

and you said the o2 sensor wire was rubbing on the fire wall, couldn't you put some plastic wrap on it to help?

[matt]

yea Idk i think the sensor is like pointed straight at the firewall, and touching it,bending the wire 90 deg. and since it is rubbing on it, it eventuall broke the wire, I suppose he could had like a small diamater peice of metal tubing bent in 90d to protect it.
but it ran fine for a reallly long time with no sensor.
so idk

[Greg]

my brothers dohc ran like that for idk how long. but it always seemed like it was just running on 2 or 3 cylinders and reaked of fuel as well. It more or less sounded like a subaru with open exhaust. anyway he always had one cylinder that was just saturated with fuel, even after two sets of spark plugs, soldering injector wires back together from msd styled ones, it could have been the year the engine sat outside not running in all kinds of weather. we did put back in his o2 sensor but that didnt seem to help. at my advice he finally pulled the injectors and the one that was always wet with fuel was stuck open with crud. i would also check the distributer and make sure it is all looking good under the cap(stuff does wear out in there). without the o2 sensor the car should just go in to fail safe and run the mixture rich, but it should still drive ok. ok being a relative term. good luck it should be a handful, but prolly a simple fix.

[C.J.]

put the o2's back in?

[matt]

my brothers dohc ran like that for idk how long. but it always seemed like it was just running on 2 or 3 cylinders and reaked of fuel as well. It more or less sounded like a subaru with open exhaust. anyway he always had one cylinder that was just saturated with fuel, even after two sets of spark plugs, soldering injector wires back together from msd styled ones, it could have been the year the engine sat outside not running in all kinds of weather. we did put back in his o2 sensor but that didnt seem to help. at my advice he finally pulled the injectors and the one that was always wet with fuel was stuck open with crud. i would also check the distributer and make sure it is all looking good under the cap(stuff does wear out in there). without the o2 sensor the car should just go in to fail safe and run the mixture rich, but it should still drive ok. ok being a relative term. good luck it should be a handful, but prolly a simple fix.

thats funny,
we pulled the plugs ( i dont remember witch ones) but 2 of the cylanders were soaked with fuel, and the others seem'ed fine.

I will have him just replace the injectors to make sure

[moparornocar]

It sounds like the Fuel Rail Pressure Sensor (FRPS)? Some will get a small hole in the diaphram and at low pressure work fine but as soon as you put it under a load it will give full fuel pressure to the injectors thinking it needs it. Then will flood out and died usually you will have to restart it with the pedal to the floor and it would shoot out raw fuel out the exhaust, check the vacum line that feeds it and see if you can smell gas? If you can, replace it. hope this helps.

[matt]

we completely replaced the fuel pressure regulator.

and he has already changed the injectors now.
I have a spare maf I am going to let him try, and if its not that,
then the ecu.
and if not that. I am raping the car for parts, and selling whats left to a ricer

[moparornocar]

I must have missed that ?

[matt]

I said.
we put in a new
FPR
fuel pressure regulator

[moparornocar]

I saw that, Sometimes I start thinking while I am reading and run into a mental train wreck?

[matt]

hahah I do that **** all the time

[TurboB18C1DC2]

I must have missed that ?

i had a friend with an almost identical probelm and it was the fpr. good diagnosis. although like he said fpr been replaced already try again.:)

[clint]

I would consider the computer. especially if the two cylinders that were flooded are companion cyliders. Assuming its not a sequentially fired system. Sounds like a driver may be going bad and if so check the injectors really well (not just ohming) alot of times bad injectors can take out a driver in a computer. Good luck!

[TurboB18C1DC2]

I would consider the computer. especially if the two cylinders that were flooded are companion cyliders. Assuming its not a sequentially fired system. Sounds like a driver may be going bad and if so check the injectors really well (not just ohming) alot of times bad injectors can take out a driver in a computer. Good luck!

that is true. i have seen some injectors drivers go bad. hondas have internal injector drivers while most dsm seem to have external ones, i dont know about nissans.

[clint]

They can go bad either way also. Full voltage to the injector wich is what it sounds like in this case or no voltage. DSM drivers are in the computer but they have a resistor block under the hood.

[TurboB18C1DC2]

They can go bad either way also. Full voltage to the injector wich is what it sounds like in this case or no voltage. DSM drivers are in the computer but they have a resistor block under the hood.

i thought the driver on 1gs were external and also had an external resistor box.

[clint]

They can go bad either way also. Full voltage to the injector wich is what it sounds like in this case or no voltage. DSM drivers are in the computer but they have a resistor block under the hood.

i thought the driver on 1gs were external and also had an external resistor box.

Not that Im aware of anyway. and I own a 1g.