Need Help!! Fuel/air Issue!

**TRIROCZ** · 07-13-2008, 07:04 AM

I have an 85 Iroc and I recently switched it back to TPI like it is suppose to be, but in the process I had my throttle body ported to 52mm and I upped the injectors to 24 lb/hr and they were stock 19 lb/hr. It runs and drives but it is running extremely rich and if it sits at idle for more than 30 seconds or so it becomes very chopy and I get a "lean exhaust" code. Code 44 I believe. It also becomes choppy on full throttle. Any ideas what is going on or what else I may have to upgrade to fix the problem?? Thanks for the help!

**Orcus79** · 07-13-2008, 10:14 AM

yea, the computer still sees the 19lb/hr injectors and is running them as such would be my best guess. running rich but getting a lean exhaust code though sounds like an 02 faliure possibly. Also check the EGR but I doubt you would still be running it.

Could also be a MAP error as well.

**TRIROCZ** · 07-13-2008, 05:38 PM

How would I solve the computer issue? If it is reading as 19 still, how do I get it to read 24? Thanks.

**Orcus79** · 07-13-2008, 05:46 PM

That I do not know, its all in the fuel curves. Sadly those computers are not easily flashed unlike the OBDII systems. As far as I amware you need to get a the driver chip replaced. I would do more digging though as to why you are running rich but the code says lean.

Pull your plugs and see what they say. It might be as simple as a a plug not firing. Elinate the basics before anything else.