Started this morning and runs very rough(Misfires). had a Map sensor code. replaced and it runs no better. In fact it will not start now. Fuel pump Ok. Any ideas.

 

return the MAP get a new one see if that works it may be bad or its not fully plugged in check that.

 

Check spark plugs, wires cap and rotor. If you give it gas while cranking will it start?

 

Did you reset the computer (PCM) when replacing any sensor it should be done .

How you ask remove the Neg battery terminal for 5 minutes then put back on but you may loose your radio presets.

Giving it gas as you crank is not a good idea this may give you a false positive or error message happens to me if I pump the pedal.

 

BIG hint: the cap has a vent hole between the center tower and the outside towers. plug the vent hole with JB-weld. this will keep moisture out. took me 5 years to figure it out.

 

datterbe

Hello. 1st I would say that if it does not start now and the only variable that has changed is the new sensor then put the old one back in if anything just to see if it changes the gripe. If it is running rough today and not yesterday what kind of driving did you do last? Did it just sit overnight? Also have you ever cleaned the IAC or throttle body? New airfilter? I would check the simple stuff first.