How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Chris (aka-Moose) Your Own Question
Chris (aka-Moose)
Chris (aka-Moose), Technician
Category: Car
Satisfied Customers: 1080
Experience:  16 years of experience
2499435
Type Your Car Question Here...
Chris (aka-Moose) is online now
A new question is answered every 9 seconds

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

Customer Question

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: 1 year ago.
Category: Car
Expert:  Gary replied 1 year ago.

when you connect the MAP can you keep the engine running with your foot on the gas pedal ?

Customer: replied 1 year ago.
Expert:  Gary replied 1 year ago.

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

and that vacuum line has good vacuum at it ?

Customer: replied 1 year ago.
There are no vacuum leaks yes everything has good vacuum line
Customer: replied 1 year ago.
Gary if you want to call me my number is(###) ###-####jerry
Expert:  Gary replied 1 year ago.

the ignition timing is set correctly ?

Customer: replied 1 year ago.
it is set correctly
Customer: replied 1 year 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
Expert:  Gary replied 1 year ago.

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

is the MAP new ?

Expert:  Gary replied 1 year 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 ?

Customer: replied 1 year 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: replied 1 year ago.
to your question about volts. With vacuum tool hooked to map sensor voltage steadily decreased while vacuum increases
Expert:  Gary replied 1 year 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 ?

Customer: replied 1 year 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
Expert:  Gary replied 1 year ago.

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

Customer: replied 1 year ago.
Will have to get pressure gauge. It does seem like when hooking up map sensor engine starves for fuel
Expert:  Gary replied 1 year ago.

ok let me know

Related Car Questions