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Discussion Starter · #1 ·
I run great one day and then other it would not start

It is getting gas and I checked the 3rd spark plug and it had a blue spark but I don't know about the air could you tell me more about how to check it? could the pcv Valve go over night? if so how do you get to it to change it?

what about the cold start valve? its 20-30 every day now

one more thing some one said that it might be the timing on the 81s something breaks on them and you lose all timing

Jeff 81 280ZXT
 

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> I run great one day and then other it would
> not start

> It is getting gas and I checked the 3rd
> spark plug and it had a blue spark but I
> don't know about the air could you tell me
> more about how to check it? could the pcv
> Valve go over night? if so how do you get to
> it to change it?

> what about the cold start valve? its 20-30
> every day now

> one more thing some one said that it might
> be the timing on the 81s something breaks on
> them and you lose all timing

> Jeff 81 280ZXT
You get it running yet? Let me know. I have an 81 too.
 

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Discussion Starter · #3 ·
no luck at all

is your Turbo? does that matter?

Jeff 280ZXT
 

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> no luck at all

> is your Turbo? does that matter?

> Jeff 280ZXT
I have an 81 Turbo. Do you hear the fuel pump kick on and pressurize right before you start the car. Were you underneath the hood doing something, that may have loosened an injection harness wire. Are you battery terminals tight?
Does the motor crank? Or is it stone dead?
I bought two 81 turbos. One I bought at a used car dealer with a real cheap paint job for $1200. The other I bought from someone that was sitting for four years. I couldn't get it started too. I replaced the brain, and it started right up. Good luck with your car,
but I would strongly suggest if you plan to keep the car, do what I did, Buy the factory
Manual. When I buy a Z, the first thing's I buy is a set of NGK's, and the factory manual. I got one shipped to my front door, with the Turbo supplement for $90.
Courtesy Nissan on the web, can get it for you.
 

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Discussion Starter · #5 ·
> I have an 81 Turbo. Do you hear the fuel
> pump kick on and pressurize right before you
> start the car. Were you underneath the hood
> doing something, that may have loosened an
I got 3 books with the car and ones a Datsun/Nisson book from Nisson

The pump comes on every time you turn the key the checker in the dash is red until the pump stops then the light goes off it sounds the same as it did when the car ran

The engine turns over just as fast as before after I had to chage it it got really low in power after testing stuff

the car came with new NGKs but the car was sitting for about 2 years but the plugs are clean really clean I just put new plug wires on it before X-Miss no fix because one of them went when checking the Spark plugs

I checked the injuctors they seam like they are in place it is getting gas

every thing is the same as the day it ran it just wont start all the sounds are the same it turns over the same nothing changed its just not starting

I did a conpression when it ran about 2 months ago it was 22 PSI with a cold engine I did not have a chance to do it when it was hot
every one was no more then 2 PSI apart

some one said it might be the brain how much do they run for? $200-$400?

I have 1 and 1/2 months to get it running
march 4th then its time to find a good job

Jeff 280ZXT
 

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Discussion Starter · #6 ·
I got 3 books with the car and ones a Datsun/Nisson book from Nisson

The pump comes on every time you turn the key the checker in the dash is red until the pump stops then the light goes off it sounds the same as it did when the car ran

The engine turns over just as fast as before after I had to chage it it got really low in power after testing stuff

the car came with new NGKs but the car was sitting for about 2 years but the plugs are clean really clean I just put new plug wires on it before X-Miss no fix because one of them went when checking the Spark plugs

I checked the injuctors they seam like they are in place it is getting gas

every thing is the same as the day it ran it just wont start all the sounds are the same it turns over the same nothing changed its just not starting

I did a conpression when it ran about 2 months ago it was 22 PSI with a cold engine I did not have a chance to do it when it was hot
every one was no more then 2 PSI apart

some one said it might be the brain how much do they run for? $200-$400?

I have 1 and 1/2 months to get it running
march 4th then its time to find a good job

Jeff 280ZXT
 

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> I got 3 books with the car and ones a
> Datsun/Nisson book from Nisson

> The pump comes on every time you turn the
> key the checker in the dash is red until the
> pump stops then the light goes off it sounds
> the same as it did when the car ran

> The engine turns over just as fast as before
> after I had to chage it it got
> really low in power after testing stuff

> the car came with new NGKs but the car was
> sitting for about 2 years but the plugs are
> clean really clean I just put new plug wires
> on it before X-Miss no fix because one
> of them went when checking the Spark
> plugs

> I checked the injuctors they seam like they
> are in place it is getting gas

> every thing is the same as the day it ran it
> just wont start all the sounds are the same
> it turns over the same nothing changed its
> just not starting

> I did a conpression when it ran about 2
> months ago it was 22 PSI with a cold engine
> I did not have a chance to do it when
> it was hot
> every one was no more then 2 PSI apart

> some one said it might be the brain how much
> do they run for? $200-$400?

> I have 1 and 1/2 months to get it running
> march 4th then its time to find a good job

> Jeff 280ZXT
Got the impression the car was running recently. If, and I repeat, if the car has been sitting for a very long time, chances are good it's the icu. Those boxes are not very durable. Disconnect the terminals to the battery. Disconnect the terminals to the brain. It's by the drivers feet up against the left, behind the Kick panel. Check the connections. Are they corroded? Run through the factory manual test, with an ohmmeter, If they are, and the car sat for a long time, especially outside, it's probably the ecu. That's what happened to the car i bought.
If you have to buy one from someone who knows what they have, you will pay a fortune. When I bought the car it wasn't running. My friend called up his towing membership place, we threw some plates on it and he told them will you get down here, some kids deflated my tires and threw leaves on the car. Meantime, the car is covered with leaves and acorns and a layer of dirt two feet thick, the rotors were rusted solid to pads. Some Spanish guy showed up with a Tow Truck, First thing he says is Give me $20, and I no say nothing Got the car towed 85 miles for $20. Ain't Life Grand. Still remember
the smoke and sparks (we sprayed wd40 all over the brake Pads) pouring out of this thing as they towed it away. If you are certain it's the ecu, I have an extra one in the garage, I know works.

thick
 

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> I run great one day and then other it would
> not start

> It is getting gas and I checked the 3rd
> spark plug and it had a blue spark but I
> don't know about the air could you tell me
> more about how to check it? could the pcv
> Valve go over night? if so how do you get to
> it to change it?

> what about the cold start valve? its 20-30
> every day now

> one more thing some one said that it might
> be the timing on the 81s something breaks on
> them and you lose all timing

> Jeff 81 280ZXT
heres a thought. Start checking relays.
 

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Discussion Starter · #9 ·
It was under a tree for about 2 years but after I got it it ran great for about 1 month then one day it just would not start

I have to run the test and see I will keep updates for you when I do it

thanks for the help

Jeff 280ZXT
 

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Discussion Starter · #10 ·
one more thing

One more thing when I took the gas out of the tank I took the gas filter off and when I did that it shot gas every there not alot but it was a mist spraying every where from the air filter to the window I looked at every thing that could get some thing in it but I did not see anything
before I washed it once and it would not go over 3k RPMs but I looked at every thing dried it and it ran great again
so maybe gas got into something and it keeps it from starting but after 1 month of sitting?

Jeff 280ZXT
 

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Discussion Starter · #11 ·
I did not have a ohmmeter but I took a look at it
and it looks new but anyways bad news I found a patched rust spot about 3 by 3 doh ohwell no one can see it and they other owner fixed it

on to the EFI unit thats what you are talking about right? I did not see a ECU in the book
the connections are clean looking no corrosion anywhere on them but there is two wires ones black and ones green with a clear connector thats just hanging there it came from some where but where? I did not see anything its coming out of the wires that go into the EFI unit

how come the ones you love always hurt you?
sniff sniff my car,,,

Jeff 280ZXT
 

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Discussion Starter · #12 ·
> heres a thought. Start checking relays.

On the 81 Model are they the 6 boxes at the front left

Air-con Relay
Inhibitor Relay
Bulb Check Relay
Fuel Pump Relay 1, 2, and 3
Lighting Relay

then bofore the window there two more the

Horn Relay
EFI Relay

am I messing any of them? now if thats all of them how do I check them?
thanks

Jeff 280ZXT
 

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> On the 81 Model are they the 6 boxes at the
> front left

> Air-con Relay
> Inhibitor Relay
> Bulb Check Relay
> Fuel Pump Relay 1, 2, and 3
> Lighting Relay

> then bofore the window there two more the

> Horn Relay
> EFI Relay

> am I messing any of them? now if thats all
> of them how do I check them?
> thanks

> Jeff 280ZXT
JEFF,

MAKE SURE YOU ARE GETTING FUEL UP TO THE FUEL RAIL, TO CHECK THIS IF YOU DO NOT HAVE A PRESSURE GAUGE, YOU CAN DISCONNECT THE FUEL INLET HOSE AND PUT IT IN A JAR AND HAVE SOMEONE TO TURN THE IGNTION ON, BUT DO NOT START IT! IF YOU ARE GETTING A GOOD AMOUNT OF FUEL IN THE JAR THEN THE FUEL PUMP MIGHT BE OK!
IF THAT'S OK, THEN CHECK TO SEE IF THE INJECTORS ARE GETTING POWER, THE BEST WAY TO CHECK THAT IS TO GO TO THE AUTO PARTS STORE LIKE AUTOZONE,OR PEPBOYS AND ASK FOR A NOID LIGHT TESTER FROM BOSCH F.I. SYSTEM.
REMOVE THE WIRING HARNESS OFF EACH INJECTOR AND ONE AT A TIME WITH THE NOID TESTER CHECK TO MAKE SURE THE NOID LIGHT , LITES UP ! , BUT MAKE SURE YOU HAVE AN HELPER TURNING THE ENGINE OVER EVERY TIME YOU USE THE NOID TESTER! (MAKE SURE YOU HAVE RECONNECTED THE FUEL LINE HOSE BEFORE YOU START USING THE NOID TESTER).
IF THE NOID LIGHT DOESN'T COME ON YOU MIGHT HAVE A PROBLEM WITH THE EFI UNIT OR A WIRING PROBLEM!
IF YOU NEED MORE INFO. PLEASE FEEL FREE TO DROP ME A LINE.

MD MIZE
 

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Discussion Starter · #14 ·
> JEFF,

> MAKE SURE YOU ARE GETTING FUEL UP TO THE
> FUEL RAIL, TO CHECK THIS IF YOU DO NOT HAVE
> A PRESSURE GAUGE, YOU CAN DISCONNECT THE
> FUEL INLET HOSE AND PUT IT IN A JAR AND HAVE
> SOMEONE TO TURN THE IGNTION ON, BUT DO NOT
> START IT! IF YOU ARE GETTING A GOOD AMOUNT
> OF FUEL IN THE JAR THEN THE FUEL PUMP MIGHT
> BE OK!
> IF THAT'S OK, THEN CHECK TO SEE IF THE
> INJECTORS ARE GETTING POWER, THE BEST WAY TO
> CHECK THAT IS TO GO TO THE AUTO PARTS STORE
> LIKE AUTOZONE,OR PEPBOYS AND ASK FOR A NOID
> LIGHT TESTER FROM BOSCH F.I. SYSTEM.
> REMOVE THE WIRING HARNESS OFF EACH INJECTOR
> AND ONE AT A TIME WITH THE NOID TESTER CHECK
> TO MAKE SURE THE NOID LIGHT , LITES UP ! ,
> BUT MAKE SURE YOU HAVE AN HELPER TURNING THE
> ENGINE OVER EVERY TIME YOU USE THE NOID
> TESTER! (MAKE SURE YOU HAVE RECONNECTED THE
> FUEL LINE HOSE BEFORE YOU START USING THE
> NOID TESTER).
> IF THE NOID LIGHT DOESN'T COME ON YOU MIGHT
> HAVE A PROBLEM WITH THE EFI UNIT OR A WIRING
> PROBLEM!
> IF YOU NEED MORE INFO. PLEASE FEEL FREE TO
> DROP ME A LINE.

> MD MIZE

I know that the fuel pump is good it puts out alot of gas every spark plug is getting gas
should I still do the light test? I know that they are getting gas because I took the spark plugs half way out and turned the engine over and it made gas run down the side of the engine out of each hole

inside the car I took a look at the EFI unit and its new looking but there is two wires ones black and ones green with a clear connector just hanging there I don't know if it was like that or if something happened and made it unclip

Jeff 280ZXT
 
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