bogging down and running real rich

[chvymudin3388]

what could be causing this? its got new cap, coil, rotor, and pick up coil.

 

[longbedder]

Is it carbed or injected? If the former, what kind of carb?

Check your float level.

 

[chvymudin3388]

its tbi 87

 

[longbedder]

Reset the ECM (disconnect power for a while), then see if it's throwing any codes while running. If it's as bad as you say, then it should be.

Could be an O2 sensor, bad coolant temp sensor, etc.

 

[chvymudin3388]

well its not the O2 sensor and im trying te TPS next

 

[vortec]

if O2 is fine, backprobe the tps through its full range of motion, checking for unusual readings, like voltage spikes, flat spots, or out-of-range message. then, make sure the MAP sensor has all of it's tubes and wires connected. if that's fine, i'd check the IAC and make sure that the piston moves freely. those aren't the only things to check, but they're easy.

 

[chvymudin3388]

where is the MAP sensor anyway im not very familiar where everything is i am with most things

 

[vortec]

pop the air cleaner off, and look at the manifold area. the MAP is generally (from what i've seen on gm trucks) located on the passenger side of the intake manifold, on a bracket, several inches from the throttle body. it's a small box, only a few inches long, and should have wires and vac tubes running to it.

i had a hose slip loose, a few years ago, and it ran pretty rough. replaced it with fuel line since it was getting crusty anyway.

 

[chvymudin3388]

well try it but please keep the suggestions coming

 

[Aquaholic]

I have an 87 and am having the same problem. Have you had any luck?

 

[chvymudin3388]

well i just found out my problem my freshly rebuilt 3,000 mile motor has real bad blow by issues and is dumping oil into the tbi from the breather tubes runningt o the tbi from teh valve covers