351 Idle problems??

98mstanggt · Sep 22, 2009

When i start the motor i have to pump the gas pedal a couple times and once it start it idles real low and black smoke come out of the tail pipes. Its only on cold start up i have to pump the gas pedal to start is that normal? Once the motor warms up the motor runs fine and theres no black smoke? The motor is carbed so what could be causing this? Any info will be greatly appreciated Thanks.

Paul · Sep 23, 2009

98mstanggt said:
what could be causing this?

The motor is carbed

There's your problem. :tongue3:

Addermk2 · Sep 23, 2009

shoulda stayed EFI and flashed the ZAO bin to a chip...

its amazing how well a car will run with some INTELLIGENT modifications

98mstanggt · Sep 23, 2009

It came carbed is there anyway to fix this?

toyman · Sep 23, 2009

Pumping the gas pedal on a carbed car injects fuel into the intake. If you need to do this for a start then the carb choke isn't set up correctly. You will need to familiarize yourself with the specs for your carb to tune it properly.

98mstanggt · Sep 23, 2009

toyman said:
Pumping the gas pedal on a carbed car injects fuel into the intake. If you need to do this for a start then the carb choke isn't set up correctly. You will need to familiarize yourself with the specs for your carb to tune it properly.

Thats the problem i dont know anything about carbs ha ha but i kind of figure it was something with the choke plate.

LAFENATU · Sep 23, 2009

I would swap it to an EFI setup.

The motor a flat motor?

tommybunz · Sep 23, 2009

carbd sucks in my opinion

98mstanggt · Sep 24, 2009

LAFENATU said:
I would swap it to an EFI setup.

The motor a flat motor?

I Knew how i would ha ha.

Whats all needed?

tommybunz said:
carbd sucks in my opinion

I agree.

LAFENATU · Sep 24, 2009

The 351, is it a flat motor?

Your going to need retrofit lifters if you want a roller.

Off the top of my head..your going to need a PCM, wiring harness, injector harness, injectors, fuel pump, sending unit, lines, fuel pump relay, intake manifold.

Im sure there is more...

modo · Sep 24, 2009

what make / model is the carb? what are the jet sizes? what is the fuel pressure?

lets start there

98mstanggt · Sep 25, 2009

LAFENATU said:
The 351, is it a flat motor?

Your going to need retrofit lifters if you want a roller.

Off the top of my head..your going to need a PCM, wiring harness, injector harness, injectors, fuel pump, sending unit, lines, fuel pump relay, intake manifold.

Im sure there is more...

Damn thats too much of a hassle, Im not sure what you mean by a flat motor?

modo said:
what make / model is the carb? what are the jet sizes? what is the fuel pressure?

lets start there

Its out 87 E350 its a 4 barrell, not sure on fuel pressure, and jet sizes.

LAFENATU · Sep 25, 2009

Flat is a certain design of camshaft.

modo · Sep 25, 2009

98mstanggt said:
LAFENATU said:

The 351, is it a flat motor?

Your going to need retrofit lifters if you want a roller.

Off the top of my head..your going to need a PCM, wiring harness, injector harness, injectors, fuel pump, sending unit, lines, fuel pump relay, intake manifold.

Im sure there is more...

Click to expand...

Damn thats too much of a hassle, Im not sure what you mean by a flat motor?

modo said:

what make / model is the carb? what are the jet sizes? what is the fuel pressure?

lets start there

Click to expand...

Its out 87 E350 its a 4 barrell, not sure on fuel pressure, and jet sizes.

he is asking you if it is a flat tappet cam, he should have been more descriptive

i would assume this is the stock 87 carb? if that is the case more then likely that puppy needs a rebuild as it is over 20 years old. if that is indeed what the problem is your best bet is to buy a new edelbrock carb. they are pretty much ready to go out of the box and will be reliable for you.

98mstanggt · Sep 27, 2009

O flat tappet well should have said that ha ha. Im not sure i would assume it is since its a 87. Yeah i'll probably just buy a need carb or switch to fuel injection, probably just buy a new carb though.