Hey guys, first post here, I have an 88 camaro with an l98 383 stroker and a procharger. My problem is when im cruising around in it (0 boost) the wide band gauge says im super lean, like 17+, but when I open it up it goes super rich, like 10-. I still have the smog equipment on my car, but my cat is hogged out. The only thing left in the cat is the air pump tube. The morons who installed the wideband put the sensor after the cat. Is the air pump putting out enough air to fool the wideband into thinking the car is lean? Bored at work yesterday I pulled cylinder number two plug out and it was the usual tan color. Im not hearing any detonation or backfiring. Is there a specific cylinder on these cars that tend to run a little leaner than the others that I could possibly check? My car does run hot, but being in louisiana in this summer heat might explain why.. I think it being rich under boost is because of the fmu and 60lb injectors. You guys have any ideas? What are some other signs of a lean car?

Erik

 

What ecm system? Still stock tpi maf based ecm just with an fmu?

If stock ecm system, was chip tuned for the 383 motor?

Now if stock ecm with chip tune that still retains egr and smog functions, and air system is still hooked up, it very well could fool o2 sensor. With a fresh set of plugs, cruise around lightly then check plugs. If they are tan you are good and wideband is off.

Also double check wideband calibration, does it require a free air calibration like the lc1 kits do?

 

It has a mini ram, no egr and supposed to have a conservative tune from greg, blower works. I just bought a set of plugs so if its not raining tomorrow ill try to get it on the lift and swap the plugs out. The gauge is an aem uego so no calibration. I wish it was the lc1.. I did the break cleaner test on the sensor and it is fine. Does the smog pump also blow into the headers where its connected? Or is it just into the cat? Could I just simply unscrew the connection to the cat hose and see what the gauge says then?

Thanks,

Erik

 

Ok, you have the blower works maf upgrade? If so it shouldnt need a fmu.

Smog pump/air system should blow into the header tubes and cat. Could disconnect the cat tube and see what happens. Should cap off the end however to prevent leaks

In all reality it should be logged and tuned for the mods live in person if not already done so. Boost tuning should definately be done in person on a dyno or track, but dyno is easiest to dial in first

 

Not sure about the upgrade. The car came with the setup. My maf is part of my piping. Its inside one of the procharger pipes. Is there any way I can make the car more rich without a tune?

 

Does it look like a stock tpi maf or is it different? Blower upgrade may have a larger diameter maf or different type, and if its inside the procharger piping then it sounds like a different maf.

Maf should control the fueling. Only way to change that is by tuning chip. Fuel pressure can change cruise air fuel but then it will skew wot fuel which is already way to rich

 

It doesn't look oem. It looks like a foot long section of piping with the maf in the center. I've had the car for 2 weeks now and im already fed up with the procharger mess. Im considering selling the procharger and slapping a good ole carb on it. Thanks for the help man.

Erik

 

Car will work good once bugs are worked out. Cant slap stuff together and expect it to run by itself