88 lo3 runs rich , i have gone through 2 o2 sensors , new map sensor, no vaccume leaks , new AC delco pluggs , new msd blaster coil , freshly rebuilt "gaskets & filters" tb , new idle air temp sensor , new plugg cables , pluggs are gapped @ .35 , running 91 octane , tried advancing timing to see if it would help but it just ran worse , no SES light or codes , brand new coolant temp sensor , it used to run even more rich than how it runs right now and that was due to an exhaust leak @ the exhaust manifold "fixed*" but still runs rich , could running the car under rich conditions have messed up a sensor that is making it run rich? i really dont know what else could be wrong

 

running rich will dirty your o2 sensors,puta AFPR on it.

 

yes it has the sock prom , and the o2 sensors have gone bad from just sitting in idle while i try to gigure out whats wrong and you mean pressure test the fuel flow ?

 

yea that would be good idea,I dont know the stock range for tbi off hand,and maybe add a adjustable fuel pressure regulator.

 

I think it's like 13 to 20 psi range or something like that. Doesn't the TBI unit have a built in FPR?

 

It Would think so,and maybe thats the problem.that why I suggest checking your fuel pressure.and a good time to upgrayd if thats the problem.could be a bad diaphram in the regulator.

 

Isn't this his second tbi unit though with the same existing problem? If so, I would be looking elsewhere for the real culprit.

 

its 9-13 stock , 13 and up is a mod. , ok the built in fuel regulator is the brass dome shaped chamber that sits on the rubber diaphragm ? right ?

 

How does the spray pattern look coming from your injectors? Is it a cone shaped spray? are there drips? Those can also make the car seem like it's running rich because the fuel isn't properly atomizing.

 

maybe you are referring to another post regarding another issue .by me .

 

Well, it's always possible that something was botched with the rebuild on the tbi unit. does it blow smoke out the rear like a diesel? ha ha.

 

when cranking the engine it drips a little bit the it turns into a cone shaped spray

 

heh, yes it smokes like hell , you think maybe the diapragm was bad , if it is what should i be looking for , and if its my fuel pressure reg. know where i could buy one without buying the whole tb unit.

 

It could be, or maybe it might just be out of adjustment per say.. I know those things can be made into adjustable. I'd just take the thing apart and rebuild it myself so I know that it's done right anyways. Or, you could go hit up the local jy and see how much they want for one. They'd probably be using one for a doorstop ha ha! I know that when I had a wiring problem is wasn't getting a good spray and my girl smoked like a damn train at the slightest throttle! very embarrassing at a stoplight.

 

i did the rebuild myself i bought a rebuild kit from autozone , as for the regulator isnt it non-adjustable since its inside the pod and in order to make it adjustable you have to drill out a hole or something like that ? i might hit up the junkyard tomorrow, see what i find " but i would be more comfortable using new parts" as for the diaphragm , how can i tell if its bad ? h and also there was this little ball bearing thing on the regulator , is it supposed to move freely ? , because it didnt .

 

went to the yard today and found a tbi unit from a 89 caprice with a 305 in it " no injectors" and i got the diaphragm , brought it home switched it out with my old "new" one and tried it out , smoke went away for a while .... and my injector on the drivers side drips with half a cone spray , so this week i will be sending them to witch hunter and just wait for results.

 

they said they were flowing fine when they got them , so if it wasnt he injectors , what els could it be , someone mentioned something about a stuck FPR or a clogged return line , is that the line that goes to the canister on the from drivers side corner?