i went to the stealership and bought/ordered 2 ac Delco o2's and got em same day....$49 ea....anyhow i'm posting some pic's in the forum on how the Bosch's looked when i removed them.. they were only a few months old i put them in when i did llp's, progressively car started running shittier. PS Bosch is black and sooted, DS is not nearly as sooted...i haven't tuned for the llp's,no cats,& no egr yet. i want some input/opinions on why car is running so rich PS.. take a look PS is on right in pic, could the stock tune really be that far off or do would an exaust leak have caused this or maybe a injector hanging open? also i keep getting a code 26 .i've switched out the sensor checked the hoses and wiring under the hood with no luck...thanks for the input !

 

How rich are you running? Do you have an AFRG? An exhaust leak can cause a rich condition, and so can an injector.

 

i dont have an AFRG, i replaced slip on joints with turbo flanges and gaskets to ensure no leaks @ connections,..(may,i stress,may) be a minor manifold leak,i say that because i do hear a tick like sound more so on the PS than the DS i have tightened the bolts the best they can be. two of the six bolts you cannot put a wrench on because of improper bolt/header pipe clearence and those are allen keyed for tightening.

P.S. i changed plugs and #6 was black but all the others were not . just throw'n that out there

 

Check the vacuum line going to the f/p regulator. If the regulator is leaking gas will be pulled into that vacuum line and dump it right on #6.

 

very true. but also.. why are you running single wire o2's ? is that a 93 thing ?

 

Yes, 93s are unheated, 1 wire O2s.

 

ok,thanks checked it out...reg doesnt seem to be leaking..

idle pressure @ rail is 38ish and over 40 a bit w/o vac line .

just in case i go get one for ***** n grins, what is a DELCO part number for the 93 FPR?

 

anyone else got some ideas here?

 

17107491 is the part number.

 

Honestly, thats just how bosch runs, at least in 93. Made mine run pig rich too, and they were as black as that.

I put some ac delco's in and ive been fine since then. Bosch also gave me crappy gas mileage, I couldnt get above 170miles per tank (hwy/street) to save my life.

Oh and mine were only a few months old before I yanked them out, actually one had failed and threw a SES light which the code was for bad o2 on the right bank.

 

Exactly the same results for me........interesting.....how do they get away with this shitty of a result from their product...............QC guy needs fired

 

I dont know, they might run fine in the later year models 94+ since they are heated, but us single wire 93 guys they run like crap.