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'90 Bluebird having wierd problems suddenly Panterrasbox 6-28-06  
Everything was great a couple months ago when it last ran. Replaced the batteries. Started right up tonight. Then the problems started (several probably unrelated).

1) "Low vacuum" light and buzzer came on and won't go off. (Fact: it has hydraulic brakes; I have no idea about anything vacuum related).

2) Engine dies when warmed up. I added a couple gallons diesel even though guage says 1/4 full. Won't start at all now.

3) Ammeter reading low (like about 9 volts when running; maybe alternator is going out). Strange electrical things even with not running: such as turn on one set of lights and then the instrument lights come on. Or when running, turn on headlights, and the "low vacuum" buzzer grows faint for a few moments.

Any ideas?
Re: '90 Bluebird having wierd problems suddenly Phil Feinstein 6-29-06  
You have 2 seperate problems.

Since the engine dies after warming up and you have that "Low vacuum" warning, I'd say you have a vacuum leak somewhere. It's possible that the leak is between the engine and the body of the bus if you have anything else (wipers, heater doors, etc) that is vacuum operated. If you have a lack of power, the leak is close to the carburator. If you have no major loss of power than the leak is farther away from the carb. All vacuum leaks will cause a rough idle and stalling at idle when warm.

The next issue sounds like you have a circuit or 2 shorted to ground through the wiring harness. check the electrical connections and wiring for the headlights and intrument lights and make sure the grounds are isolated from the power feeds.

Hope that helps!
Re: '90 Bluebird having wierd problems suddenly gw 7-2-06  
May or may not help you.not familiar with your ride but may point something to look at.
1) "Low vacuum" light and buzzer came on and won't go off. (Fact: it has hydraulic brakes; I have no idea about anything vacuum related).
i also see you said you added diesel, so i assume its a diesel engine your talking about. since you have juice brakes and not air, the brake system needs a vacume or hyd.pump to assist you in appling the brakes. the light/buzzer your refuring to is more than likely to be related to an eletrical prob.. (will prob. be fine once you take care of other issuses.
2) Engine dies when warmed up. I added a couple gallons diesel even though guage says 1/4 full. Won't start at all now.
the reason the engine prob. died was(again dont know what engine you have) but sounds as though your volts dropped to a level that they could not maintain the voltage require to hold the fuel solenoid open.(this to will be ok once electrical prob. is fixed)

3) Ammeter reading low (like about 9 volts when running; maybe alternator is going out). Strange electrical things even with not running: such as turn on one set of lights and then the instrument lights come on. Or when running, turn on headlights, and the "low vacuum" buzzer grows faint for a few moments.
before you start tearing into things. i would suggest you remove the batteries/recharge then test them. cell test,load test,volt test.. then (again not knowing the system) whether they are connected in series or not.. making sure you have connected them correctly. making sure not to have missed hooking up any wrong wiring. now having everything hooked up except the ground to battery post, put a test light between the neg.post of the batt. and neg. cable end. N O T E if there is anything drawing amps the light will come on. for instance a clock radio would to some point draw enought to poss. have a very dim/weak light. a headlight switch or sort would draw alot of amps and would light your test lamp bright. as would a direct sort in the system. if your batts are being drained, use the test light or a buzzer to elleminate the problem.. again take a volt test a assure 13plus volts. then start and check charging system. hope something here will help ya. if not email me.. gw
Re: '90 Bluebird having wierd problems suddenly Phil Feinstein 7-3-06  
Thanks GW! good stuff!

I missed the deisel entirely; good catch.
Re: '90 Bluebird having wierd problems suddenly John Benstock 1-28-07  
Sorry to read about your wiring problems. Good luck. If you will ever be converting your Bluebird bus door and will no longer need the original driver's handle, shroud, and linkage, please contact me, I am looking for the handle, shroud, and linkage. I'm also looking for the metal exterior grab handles, fans, and fan switches. Thanks! My e-mail is mrbenstock@hotmail.com

Thanks,

John Benstock
Re: '90 Bluebird having wierd problems suddenly John Benstock 1-28-07  
Sorry to read about your wiring problems. Hope you have been able to fix them. If you will be converting your Bluebird bus door and will no longer need the original driver's handle, shroud, and linkage, please contact me, I am looking for the handle, shroud, and linkage. I'm also looking for the metal exterior grab handles, fans, and fan switches. Thanks! My e-mail is mrbenstock@hotmail.com
Re: '90 Bluebird having wierd problems suddenly larry 2-2-07  
I think it is a low voltage condition
causing the engine not to run,
the fuel selinoid shut off is
ativated because of the low voltage,
that stopps the engine..
i had this happen to me the brushes
in my alt. needed replaced.

larry
Re: '90 Bluebird having wierd problems suddenly Panterrasbox 11-2-08  
Looks like I never came back and reported my findings...

Turns out that I found a crisped wire connecting to the fuel shut-down solenoid. The plunger was stuck in the extended/off position so that it was pushing against the fuel shut-off lever thing inside the engine.

I removed the damaged solenoid and the engine fired right up! To kill the engine, I had to push the shut off lever manually until I replaced the solenoid.

I was able to find a new solenoid for about $135. It took a few minutes to install and reconnect, and I've been running ever since.

Glad that one is over!
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