MAP Question

[Bman]

Hey,
I just put my upper intake manifold on and tried to start my car. It started and then quit, I check for an engine code and (MAP/BARO low input curcuit). Does anyone have any ideas of what I can look for, I checked my wires and they were all in tack. I have a 99 grand prix with a 3100 SFI.
Thanks,
Brandon

[geoffinbc]

Is there a vacuum signal to the map sensor

[George]

There is a vacuum line that connects the Map sensor to the manifold that is a little out of view because it is under the sensor. Is it hooked up and not leaking anywhere?

[robby1870]

You might have broke the line or something. Pretty common thing when removing the plenum or doing rear plugs. I know Ive done it a couple of times. Once it was just a crack and really hard to track down.

[Bman]

Thanks for the info, I looked at everything and as I was putting things into place I noticed at the very base of the plug that one of the 3 wires had started to come apart. I think this is what may be wrong so I will have to solder it tomorrow.
Thanks,
Brandon

[Bman]

That wasen't the problem, I tried it again and it still won't start, I have checked the connectors, hoses, wires, leaks, and still I can't find anything that is wrong?
Is there a second fuse box on a 99 grand prix? If so where is it located at?
Thanks,
Brandon

[imported_germ]

there should be 3 fuse boxes, IIRC.

1 on the passenger side dash, by the door

2 in the engine bay, 1 on passenger, 1 on driver side. both are located right by the fender and the strut tower.

but none of them will have a fuse for your map i dont think

replace the map and see if that helps.

if you need one, i may have one laying around somewhere.

[lumination]

engine probs

if the car was hard to start before it died (had to use throttle) you might have the plug wires crossed when I swapped the 3100 in my 1997 lumina about a month ago and replaced the plugwires while I was at it well the coil was marked 1-6 and the intake is numbered also, plug and play right, WRONG. it was 180 out 1 was 2, 3 was 4, 5 was 6 it had me dumbfounded so hopefully that can help. JON

[Doubt_Incarnate]

low input circut... so that means the power required for the sensor to vary isnt there? check for a short somewhere, maybe a wire got pinched during assembly, and is grounding out. but if you say it started up then died, then your sensor probably just crapped right then. once i went to shut my car off, and the cheap ass autozone icm died just as i touched the key, so the car died before i shut it down.