I have a 92 RS 305 TBI automatic with 149,000 miles, all stock & the engine seems to be running rich. The exhaust smells bad & when datalogging the BLM & INT always go down to 108 after it goes closed loop.

The car doesn't smoke at all & the car runs absolutey perfect, except that i can't pass emissions b/c of this rich issue.

All sensors tested good & they all work as normal when datalogging. Even though all sensors tested good, because of age i replaces all sensors (map, cts, iat, knock, new acdelco o2 sensor), new fuel pump & fuel filter, air filter, spark plugs & wires, cap & rotor, ignition coil, the throttlebody was rebuilt & the injectors were cleaned & are the correct ones for my engine. The intake was removed & cleaned & the egr works good as well.

All spark plugs are firing & the engine doesn't miss at all.
The fuel pressure is @ 11 psi & was also 11 psi with the old fuel pump as well. The engine vacuum at idle is about 21".

Ive owned the car for several years, & the exhaust has always smelled bad, but i used to live in a county that didn't have emissions testing, but now i live in an emissions county.

I took a video of the injectors spraying & the cone shape seems perfect, & while watching the video you can see the injectors pulsing on & off.

I check for fault codes often (& there are none) & it only flashes code 12.

The only thing that i can think of is that the ecm 1228746 may not be functioning correctly.

Any ideas?

 

I wonder if someone put the wrong injectors in the TBI unit? Or the TBI was swapped for one from a 5.7l engine?

RBob.

 

My first thought was CTS but you said you swapped it out.

My defective MAP made car run extremely lean.

 

The TBI is a 220 with the correct 5.0 injectors.

Anyone else have any ideas.

 

I'm starting to smell a troll...

RBob.

 

That's almost as funny as when you told that guy to throw his multitec's to the nearest garbage can when he wanted to try to sell them.

 

Any other ideas?

 

You've been fighting this problem for at least 8 months since you changed the intake manifold so look for a vacuum leak. It would also explain your surging idle from another post.

 

I'll give it another go, remove the CCP hose at the TBI and plug the port on the TBI. See if the BLMs return to normal.

RBob.