Can anyone tell me what the symptom of a bad Map Sensor is? My 91 Civic Wagon all of a sudden overnight the engine boggs down immediatly when the gas pedal is is depressed the the power slowly returns as the car reaches the speed im trying to get to. It acts like the old vintage engines did when the vacuum advance units got a leak in them. I have a D15b I already changed plugs/wires/distributor/cap/rotor and fuel filter and ran a couple cans of injector cleaner through the tank. I was gonna buy a Map Sensor but the durn things are $260 at AutoZone! Geeeeez I dont wanna sink that much unless Im sure I need it. I get no eror codes on the ECU. Any ideas from all you Civic Dudes and Du-dettes. :0)

 

When I redid the vacuum lines on to reduce the mess in my old Civic, I encountered a problem like this... it was a result of T'ing off the MAP vacuum line thus not giving the MAP sensor a proper vacuum sample. It didn't throw a code either, but that was a pre-OBD computer.

Total MAP failure should throw the proper check code, however.

Have you checked the TPS sensor? It's a common cause of sudden bogging issues.

 

if you figure it out, and it does turn out to be a MAP sensor, I have one I could sell to you for a butt load less than 260 bucks

 

Kai's right. This is the EXACT same problem I had with my old d16a6. It would bog when I accelerated a little fast, and would stop after a few seconds. It would do this mainly in third gear, but it could happen in any gear. It's definitely a sign of a bad tps sensor. Hmmm... If your ecu isn't throwing codes, u could always check the resistance on the sensor itself, and also, check for power with a tester.

 

Thanks everyone Ill check out the TPS and report back