LB7: Limited to 2000 rpms HELP

[willydmax]

Just got done replacing all 8 injectors in Dad's 02. After a bit of cranking she fired up and idled perfect then when I went to rev it up it won't rev past 2000 rpms. It has 211000 miles on it, KD Mega filter, KD dual lift pumps, new filters. I put Kennedy's restriction gauge on it and it shows 7.5 psi. There's no check engine light. Dad has a scan tool (Innova Can OBD2&1) and it says there are no stored codes. Maybe the scan tool isn't any good? What do you think? This is the second time I've replaced the injectors myself. Last time was at 160,000 miles back in 2010. I am at a standstill so far. Thanks!

[THEFERMANATOR]

Check the MAF sensor as any prolem with it and teh ECM will go into limp and restrict you to 2K RPM's.

[willydmax]

I sprayed it with some carb cleaner and blew it dry with air along with the connectors. Is that all I can do with it or is there a way to diagnose it?

[willydmax]

Still trying to figure this out. I am in the process of taking connectors apart and spraying them with contact cleaner in hopes that will fix it. It just seems strange to me that it acts like its in limp mode without any codes. Any thoughts?

[willydmax]

Well I put her all back together and took her for a spin to see what would happen and lo and behold she runs perfect! I don't know if Kennedys tuned ECM has something in it to limit it to 2000 rpms sitting in park or if I still have an issue. Whatever the case I am very pleased that its running great! Thanks for the help.

[THEFERMANATOR]

Originally Posted by willydmax

I sprayed it with some carb cleaner and blew it dry with air along with the connectors. Is that all I can do with it or is there a way to diagnose it?

I would say you need to be prepared to replace your MAF sensor REAL soon as carb cleaner DESTROYS them. you NEVER EVER use carb cleaner, even many MAF cleaners can harm the circuit board on them. Electrical contact cleaner is the safest cleaner to use on them. And blow drying it with compressed air can break the MAF element off as well. And yes many operating systems are limited in RPM's in neutral.