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Again with the 92 454 chevy r.v well i have replaced the

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hi gary jerry again with...
hi gary jerry again with the 92 454 chevy r.v well i have replaced the entire distributor, and the motor still dies when I hook up the map sensor , you told me to let you know how it went once I replaced the distributor. what would cause the motor to die
when I hook up the map sensor?
Submitted: 2 years ago.Category: Car
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Answered in 2 minutes by:
8/4/2015
Auto Mechanic: Gary, Technician replied 2 years ago
Gary
Gary, Technician
Category: Car
Satisfied Customers: 17,276
Experience: GM master tech for 15 years/ASE master tech for 20 years
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when you connect the MAP can you keep the engine running with your foot on the gas pedal ?

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Auto Mechanic: Gary, Technician replied 2 years ago

there are NO vacuum leaks at all including the throttle body base gasket ?

and that vacuum line has good vacuum at it ?

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Customer reply replied 2 years ago
There are no vacuum leaks yes everything has good vacuum line
Customer reply replied 2 years ago
Gary if you want to call me my number is(###) ###-####jerry
Auto Mechanic: Gary, Technician replied 2 years ago

the ignition timing is set correctly ?

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Customer reply replied 2 years ago
it is set correctly
Customer reply replied 2 years ago
It is doing the exact same thing it was b4 I replaced the distributor. It idles fine until I hook up map sensor and then runs like shit
Auto Mechanic: Gary, Technician replied 2 years ago

any access to a scan tool to see live computer data ?

is the MAP new ?

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Auto Mechanic: Gary, Technician replied 2 years ago

i am curious what the MAP sensor is sending back for a signal to the computer

with the key ON and you unplug the MAP does one terminal show 5 volts and one show a good ground ?

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Customer reply replied 2 years ago
No access to live tool, have replaced the map sensor twice have tested it did vacuum test on map sensor commuter plug in module is giving me no bad codes gives me code 12 which means it's talking to the computer
Customer reply replied 2 years ago
to your question about volts. With vacuum tool hooked to map sensor voltage steadily decreased while vacuum increases
Auto Mechanic: Gary, Technician replied 2 years ago

at this point i have never seen this before

let me ask how much do you have to touch the gas pedal to keep it from stalling ?

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Customer reply replied 2 years ago
I can do anything with the gas pedal I want it doesn't recover until I let my foot off the gas pedal. I will check for all possible vacuum leaks again
Auto Mechanic: Gary, Technician replied 2 years ago

can you be sure you have 7 to 13 PSI of fuel pressure at the throttle body key ON engine OFF ?

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Customer reply replied 2 years ago
Will have to get pressure gauge. It does seem like when hooking up map sensor engine starves for fuel
Auto Mechanic: Gary, Technician replied 2 years ago

ok let me know

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