1995 NAS V8 stalled/won't start

aeo

Well-known member
Driving the 90 yesterday, pulled into a parking lot, went over the speed bump, stalled. Thought it was user error. Couldn't get it to turn over. Waited a few hours. Still no go. It cranks and acts like it's going to start, it just doesn't turn over.

It's done this before but it's not consistent. I thought maybe last time it was bad gas. I had just put about 5 gallons in it before this happened. I thought maybe flooded but there was not a smell of gas. Even after cranking it a few times. It stinks of something all the time anyway. A few days ago it struggled to fire up and stumbled a bit at start up. Like it wasn't firing on all cylinders. But after a minute or two it was fine.

Thoughts?
 

RBBailey

NAS-ROW Addict
Callsign: KF7KFZ
First thing is to do a close check of all the leads and spark plugs, and look for anything that is hiding that could be an easy diagnosis. Fuel pump working? Missing or broken vacuum lines? etc....
 

aeo

Well-known member
First thing is to do a close check of all the leads and spark plugs, and look for anything that is hiding that could be an easy diagnosis. Fuel pump working? Missing or broken vacuum lines? etc....
The leads all look to be connected. The distributor cap and wires were replaced last year. I can hear the fuel pump. I don't see any missing or broken vacuum lines.
 

rocky

Well-known member
Remove the dizzy cap. Is the button still there underneath the cap? How is the rotor?
Something basic shook loose!
 

TravelinLight

Well-known member
If it turns over, fuel is getting there, sounds like no spark. Check the coil wires to insure that it is getting the signal to fire.
 

chris snell

Administrator
Callsign: NW5W
Staff member
It's been a while since I owned a NAS but there is a small wire in a spade connector going into the ignition coil that came loose from time to time and will result in a crank no-start when it does.
 

jymmiejamz

Founding Member
Callsign: KN4JHI
If you think it is flooded, disconnect the inertia switch and try cranking it with the pedal to the floor. If it runs at all, then you have too much fuel. In that case, it is usually the coolant temp sensor that has failed causing the fuel injection to run full rich.
 

aeo

Well-known member
Checked the module, ignition coil and distributor (which is newer). All things seem fine. Still won't turn over, just cranks.
 

aeo

Well-known member
If you think it is flooded, disconnect the inertia switch and try cranking it with the pedal to the floor. If it runs at all, then you have too much fuel. In that case, it is usually the coolant temp sensor that has failed causing the fuel injection to run full rich.
Nope. Nothing. Same.
 
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def90

Member
Had similar issue last year. It was due to bad rotor arm. If you have a spare try that first. It’s a common issue. The new red ones at RN are supposed to be better than the oem ones. I just put one it so can’t yet attest to that.
 

geatlander

Active member
Check your inertia switch under the hood. Sounds like the speed bump tripped it. Did the speed bump rattle your teeth? lol
 

aeo

Well-known member
So...Checked the inertia switch under the hood. Not tripped. Disconnected it and used a paper clip jump it. No changes. I hear the fuel pump. Pulled the fuse and then didn't hear the fuel pump. It seems like it's not getting fuel. How would I start to trouble shoot that?
 

jymmiejamz

Founding Member
Callsign: KN4JHI
You need to see if you have spark and you need to verify that you have adequate fuel pressure. Just because the pump is running doesn't mean it is generating any pressure.
 

Uncle Douglas

Well-known member
To check spark.

Pull the coil wire from the center of the cap and hold it near (1/4 inch or so) something bare metal like the alternator housing.
Have a second person turn the key and spin the engine. You should see a healthy spark arc/jump that gap. This indicates the amplifier, coil, and field in the distributor are all three working well,@ that point its either the cap or rotor. If not then there is no power from the ignition switch, or one of the three components above, or the wiring connecting them isnt functioning.
 

def90

Member
Or just spray starter fluid into the plenum. If it starts then fails shortly after you have spark but no fuel.
 

Adam

Well-known member
Rotor. Always do the rotor first on those v8's. Every thread I read ends with - "I replaced the rotor and now it runs"
 
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