Jump to content

1985 Nissan pickup 2wd z24 won't run right


Jp2

Recommended Posts

Tried starting my truck two nights ago, didn't run it since probably November. After replacing battery, it worked fine, ran it for 15 mins till the engine was at operating temp. Got back to it this morning and it started fine and ran rich initially - normal for it, but started running worse and worse, until it needed constant gas to stay on - then cut out.  Do you guys think it's just old gas or is this a sign the carburetor gods have frowned upon me?

Link to comment
  • Replies 16
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

15 minutes ago, datzenmike said:

Choke likely stuck on this time. Should begin opening till fully open when engine is hot.

or if it is cold out the choke might be not be closing correctly. after my carb sat while I was doing the headgasket the choke worked kind of from what I can tell but then it crapped out on me and it was behaving similarly. Going to be putting a weber on it this weekend and replacing the thermostat with a factory nissan stat. Jp pull the air cleaner and turn the ignition on and see if the choke is closing a good running carb should give you no issues my 86 which has a holley 5200 fired right up today after sitting for a couple weeks. Might also pull the plugs and check them out. 

Link to comment
31 minutes ago, datzenmike said:

Choke likely stuck on this time. Should begin opening till fully open when engine is hot.

So I revved it to stay on until it got to operating temp, then it still cut out. Also the air smelled bad. I was thinking too that something was stuck. 

Link to comment
25 minutes ago, ElliotV said:

or if it is cold out the choke might be not be closing correctly. after my carb sat while I was doing the headgasket the choke worked kind of from what I can tell but then it crapped out on me and it was behaving similarly. Going to be putting a weber on it this weekend and replacing the thermostat with a factory nissan stat. Jp pull the air cleaner and turn the ignition on and see if the choke is closing a good running carb should give you no issues my 86 which has a holley 5200 fired right up today after sitting for a couple weeks. Might also pull the plugs and check them out. 

This usually happens to my pickup in the winter but today was actually warm, like 78 fahrenheit warm which is when I gave it a shot. I replaced the spark plugs and spark plug wires (unnecessary I know) two years. Even timed it right with a timing light and everything. One thing I forgot to mention, I did take the filter housing cover off and noticed vapor coming from the carb. Now I'm not sure if that's normal but my hunch is no, which is why I'm thinking it might be watered down fuel since it sat for a long time 

Link to comment
13 minutes ago, datzenmike said:

This is a California emissions truck so it has the ECC carburetor. It does have a choke.

I am assuming those carburetors are hard to come by?

Link to comment

Not rare. They have a solenoid in the primary jet that is controlled by an ECU that sets the open and shut pule rate. Feedback from an O2 sensor keeps the mixture at near optimum. It's complex but not active when engine cold should turn on closed loop when engine warmed up.

Link to comment
1 hour ago, datzenmike said:

Not rare. They have a solenoid in the primary jet that is controlled by an ECU that sets the open and shut pule rate. Feedback from an O2 sensor keeps the mixture at near optimum. It's complex but not active when engine cold should turn on closed loop when engine warmed up.

But shouldn't the problem fix itself when the engine is at operating temp?

Link to comment
3 minutes ago, datzenmike said:

Something isn't working right.

Additionally, the vapor/smoke coming from the carburetor, not normal and on a scale of 1-10 how bad/dangerous is it? It's kind of why I thought there was bad gas in the engine, say maybe condensation in the system maybe?

Link to comment
5 hours ago, Jp2 said:

Additionally, the vapor/smoke coming from the carburetor, not normal and on a scale of 1-10 how bad/dangerous is it? It's kind of why I thought there was bad gas in the engine, say maybe condensation in the system maybe?

Vapor usually means there's gas getting by the needle/seat. Not dangerous but not good. Engine wont do right as it's getting extra gas. Looked at carb fuel level window?

Link to comment
9 hours ago, DwayneOxford said:

Vapor usually means there's gas getting by the needle/seat. Not dangerous but not good. Engine wont do right as it's getting extra gas. Looked at carb fuel level window?

The fuel level in the carb window looks slightly below middle which i think is normal for it?

Link to comment

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.