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Discussion Starter · #1 ·
I have a 78 280 that is hurting in a bad way. Let me start off by telling everyone what i have replaced. I put in a new thermotime sensor, plugs, wires, cap and rotor, temp sensor, injectors(brand new), I think that is all. You would think the car would run great. Well it did until friday. What it is doing is, when i start it it misses and blows black smoke bad. I know this is a fuel problem. When I disconnect the throtle position sensor it runs better but not good. It will still smoke but not miss as bad.

I wish to point out that i might also have a short in my car. When i disconnect the negative lead on the battery. Then using an ohm meter from the negative side of the battery I test for voltage by touching the motor itself. I get 12 volts. If this is common on z's please let me know.

One other bit of info. I know that my air regulator is bad. It is falling apart. The end with the plug on it seems to come right out of the housing. I don't think this is the problem though. It has been that way for the last 7 months.

When i bought the car some hoses were plugged with bb's. the one that comes to mind is the fuel regulator vacume line. Could my regulator for fuel be bad? Or maybe my Mass Airflow meter? I know that it is getting too much fuel. Not, not enough air.

Please HELP!!!
 

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Discussion Starter · #2 ·
> I have a 78 280 that is hurting in a bad
> way. Let me start off by telling everyone
> what i have replaced. I put in a new
> thermotime sensor, plugs, wires, cap and
> rotor, temp sensor, injectors(brand new), I
> think that is all. You would think the car
> would run great. Well it did until friday.
> What it is doing is, when i start it it
> misses and blows black smoke bad. I know
> this is a fuel problem. When I disconnect
> the throtle position sensor it runs better
> but not good. It will still smoke but not
> miss as bad.

> I wish to point out that i might also have a
> short in my car. When i disconnect the
> negative lead on the battery. Then using an
> ohm meter from the negative side of the
> battery I test for voltage by touching the
> motor itself. I get 12 volts. If this is
> common on z's please let me know.

> One other bit of info. I know that my air
> regulator is bad. It is falling apart. The
> end with the plug on it seems to come right
> out of the housing. I don't think this is
> the problem though. It has been that way for
> the last 7 months.

> When i bought the car some hoses were
> plugged with bb's. the one that comes to
> mind is the fuel regulator vacume line.
> Could my regulator for fuel be bad? Or maybe
> my Mass Airflow meter? I know that it is
> getting too much fuel. Not, not enough air.

> Please HELP!!!

I think you pretty mush listed all of your possibles. I would first repair all of the vacuum lines since this is the least expensive way. Test your air regulator with your volt/ohm meter using the Haynes/Chilton manual. The only way that I know of to test your AFM is to replace it with one you know works, to see a difference.

What color is the smoke coming out of the car?
What do your plugs look like?
JN
 

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> I have a 78 280 that is hurting in a bad
> way. Let me start off by telling everyone
> what i have replaced. I put in a new
> thermotime sensor, plugs, wires, cap and
> rotor, temp sensor, injectors(brand new), I
> think that is all. You would think the car
> would run great. Well it did until friday.
> What it is doing is, when i start it it
> misses and blows black smoke bad. I know
> this is a fuel problem. When I disconnect
> the throtle position sensor it runs better
> but not good. It will still smoke but not
> miss as bad.

> I wish to point out that i might also have a
> short in my car. When i disconnect the
> negative lead on the battery. Then using an
> ohm meter from the negative side of the
> battery I test for voltage by touching the
> motor itself. I get 12 volts. If this is
> common on z's please let me know.

> One other bit of info. I know that my air
> regulator is bad. It is falling apart. The
> end with the plug on it seems to come right
> out of the housing. I don't think this is
> the problem though. It has been that way for
> the last 7 months.

> When i bought the car some hoses were
> plugged with bb's. the one that comes to
> mind is the fuel regulator vacume line.
> Could my regulator for fuel be bad? Or maybe
> my Mass Airflow meter? I know that it is
> getting too much fuel. Not, not enough air.

> Please HELP!!!

The fuel pressure regulator vacume hose should not be plugged. The regulator need this vacume source to work properly.

When all seems to be bad, correct the things that you *know* are wrong, then see what kind of symptoms you get. Sometimes several things can manefest themselves into a weird type of problem.

Ken
 
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