The Check Engine Light came on in my 1988 K5 Blazer. I retrieved the code, a 32 (barametric pressure / Map Sensor / EGR). The engine runs fine except for a rich exhaust/fuel smell. Could the Map Sensor really be the culpret? I hate to go out and spend money on a sensor without knowing for sure. Any answers would be appreciated. Thanks, JB
MAP Sensor
- Thread starter JB
- Start date
John DiMartino
LawnSite Silver Member
- Location
- Walden,NY
try pulling off the vacuum line to the map sensor,make sure you have vacuum to it while its idling,you might have an imploded line or a leak in it,<p>----------<br>John D<br>
yortengel
LawnSite Member
- Location
- Clawson, Mi
I would check for a Vacuum leak in the line (like said) also look to make sure that the gasket under the TBI is OK. they have a way of going bad after a little time. GM map sensors are not know for going bad. If you live close to Detroit I've got a new one you can try.<br>Good Luck
John DiMartino
LawnSite Silver Member
- Location
- Walden,NY
JB,is it fixed?<p>----------<br>John D<br>
yortengel
LawnSite Member
- Location
- Clawson, Mi
What makes you think its running rich?
- Thread Starter
- #8
At idle, there is quite a smell of unburned fuel. Almost makes your eyes tear. After I connected the wire to the Map sensor I eliminated the check engine light from coming on. I did discover one thing though; the air intake thermostat flap was not opening. The cold start heat riser tube is missing so the thermostat was not opening the air flap and that seems to be why it was running rich. Now the engine is getting the air it needs to breath. JB
yortengel
LawnSite Member
- Location
- Clawson, Mi
Great, Does it still smell funny?<br>Keep us informed.
