round 3

[blacksnapon]

1974 Chev 350 V8(I know, I know). Automatic trans 2WD. Customer brings it in, wont stay running. Remove pcv valve from valve cover, stays running, runs good, no noise. 1 part responsible, ready?..................GO!

 

[m78]

air filter

 

[flareside_thunder]

Bad brake booster?

 

[73F100Shortbed]

I would say air filter as well.

 

[blacksnapon]

air filter

NOPE!!!!!!!!!!!!!

 

[blacksnapon]

Bad brake booster?

NOPE!!!!!!!!!!!

 

[m78]

EGR,,,,,,,,,,,,,

 

[Fordzilla80]

Defective PCV valve? Poor Vacuum?

Isn't there a PCV filter in the air cleaner too? If so, could it be oil soaked?

 

[blacksnapon]

EGR,,,,,,,,,,,,,

EGR would most likely be constant, wouldnt make a difference plugged in or unplugged. Remember the vehicle.

 

[m78]

1974 Chev 350 V8(I know, I know). Automatic trans 2WD. Customer brings it in, wont stay running. Remove pcv valve from valve cover, stays running, runs good, no noise. 1 part responsible, ready?..................GO!

was there noise before ?

 

[blacksnapon]

Defective PCV valve? Poor Vacuum?

Isn't there a PCV filter in the air cleaner too? If so, could it be oil soaked?

PCV valve works fine, because it changes when unplugged. Poor vacuum would be plugged in or not.

 

[blacksnapon]

was there noise before ?

No noise (I actually had one of these with this issue)

 

[m78]

oil fumes choking it out. Oil filter clogged

 

[blacksnapon]

oil fumes choking it out. Oil filter clogged

OIL fumes.......HMMMM....nope. Oil filters have a bypass.

 

[flareside_thunder]

Vacuum advance?

 

[Fordzilla80]

Fuel problem?

 

[blacksnapon]

Vacuum advance?

HUH??????????

 

[blacksnapon]

Fuel problem?

Explain how!!!!!

 

[flareside_thunder]

Isn't there a vacuum advance on that thing? Vacuum advance diaphram bad?

EDIT: So that must mean it's a fuel iskew....

 

[blacksnapon]

Isn't there a vacuum advance on that thing? Vacuum advance diaphram bad?

EDIT: So that must mean it's a fuel iskew....

Vacuum advance would probably work the other direction, unplug, and the engine quitting.