dont know where to go from here ! - Third Generation F-Body Message Boards

Birdstheword909 · 11-06-2009, 09:41 PM

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

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MADMAXGTA · 11-06-2009, 09:45 PM

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

Birdstheword909 · 11-06-2009, 10:02 PM

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 ?

MADMAXGTA · 11-06-2009, 10:04 PM

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

osirus · 11-06-2009, 10:08 PM

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

MADMAXGTA · 11-06-2009, 10:13 PM

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.

osirus · 11-06-2009, 10:16 PM

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

Birdstheword909 · 11-06-2009, 10:16 PM

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 ?

osirus · 11-06-2009, 10:17 PM

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.

Birdstheword909 · 11-06-2009, 10:18 PM

Quote:

Originally Posted by osirus

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

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

osirus · 11-06-2009, 10:20 PM

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.

Birdstheword909 · 11-06-2009, 10:20 PM

Quote:

Originally Posted by osirus

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.

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

Birdstheword909 · 11-06-2009, 10:24 PM

Quote:

Originally Posted by osirus

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.

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.

osirus · 11-06-2009, 10:29 PM

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.

Birdstheword909 · 11-06-2009, 10:38 PM

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 .

Birdstheword909 · 11-08-2009, 01:45 AM

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.

Birdstheword909 · 11-17-2009, 03:14 AM

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?