Hi all. Any help would be appreciated. Car is a '92 Civic DX, 1500 engine. Runs ok, but hard to start and tends to stall at a stop. I've checked engine compression and timing. Put in a new fuel filter, fuel injectors and air idler solenoid valve. Fuel pressure is good around 37 psi. New distributor, plugs look good - though a bit too white like it's running lean. Next up, maybe the MAP sensor. Any other ideas?

Problem with the MAP sensor is it's about $300 to replace <gasp!> I wonder:
1. Is there anything else worth checking/testing?
2. Could I use a MAP sensor off some other vehicle that's less expensive?

Seriously, the MAP sensor for my truck was about $30, not $300. I understand they all have 3 wires - Ground, 5 VDC and PIM Voltage signal. I'd take one off another vehicle and test it out, but that means cutting wires so maybe someone's already tried this.

 

remove the electrical plug from the air valve, start the engine and ajust the idle screw on the throttle body till it idles at about 700rpm, it will generate a code but ignore it for now, stop the engine, replace the plug and reset the error code.

 

Thanks itsmejto
Just tried that. Backed out the idle screw as far as it would go but that doesn't do enough to keep it idling. Still stalls out. It'll run fine as long as it's moving or not at low RPM, but won't idle. Mid to high RPM is fine.

I've also tried adjusting the throttle cable to boost the idle RPM which helps, but then it's idling too fast to keep in gear at a stop, and still stalls out.

 

Does anyone know what the MAP sensor voltage should be?
('92 Honda Civic DX, 1.5L engine, 16 Valve)

I measured:
- 5 VDC between ground and power supply. That's good.
- 2.8 VDC between ground and signal with engine off. That seems very low (see below).
- .93 VDC between ground and signal with engine idling. Seems low again.
(note: altitude here is only about 1000 feet, so fairly close to sea level)

The two web pages I checked for what voltage it SHOULD be are here:
http://autorepair.about.com/cs...6.htm
http://www.autozone.com/az/cds...s.htm

Both seem to indicate a voltage with engine off of about 4 to 5 VDC. Idling should be around 1.5 VDC. However, these web pages aren't vehicle specific, they are very general. To see how well they compare, I checked my GMC truck that works great and had a MAP sensor change a few years ago. Voltages for the GMC were:
- 4.7 VDC between ground and signal with engine off.
- 1.4 VDC between ground and signal with engine idling.

So I spliced in the MAP sensor from the GMC into the Honda. The Honda didn't run right and the "Check Engine" light came on.

So does anyone have what values the Honda MAP sensor SHOULD be putting out? Thanks in advance.

 

Did you ever get this car fixed? Was it the MAP sensor after all?

If not what was it please?