Lawn Care Forum banner
1 - 11 of 11 Posts

·
Registered
Joined
·
92 Posts
Discussion Starter · #1 ·
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
 

·
Registered
Joined
·
216 Posts
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.
Good Luck
 

·
Registered
Joined
·
92 Posts
Discussion Starter · #4 ·
Thanks for the info. I found a wire that was disconnected from the EGR crircut, maybe that was the culpret. I checked the EGR and it was working fine and the vaccum lines seem okay. I re-attached the wire and will road test it tommorow.
 

·
Registered
Joined
·
92 Posts
Discussion Starter · #6 ·
John; Seems to be okay, that is, the check engine light has not come on as of yet. It still seems to be running a bit rich though. It has a new oxygen sensor and the motor only has 11,000 miles after a complete rebuild.
 

·
Registered
Joined
·
92 Posts
Discussion 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
 
1 - 11 of 11 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top