Clifford4.7

I recently just built a 4.7 stroker for my 1999 Jeep XJ. Its got AFE Headers and AFE catback exhaust a 62mm throttle body and running a 27# injectors. Im having problems breaking in the cam I cant keep it running past 5 minutes. The exhaust manifold is glowing red at 2000rpm. It will run for those 5 minutes and then pop out the exhaust and die. Do I need to reprogram anything?
Please Help

GRohr

Have you installed a wideband AFR sensor? I used my stock injectors to break in my cam for my stroker in my renix XJ. After I broke it in, I put in larger injectors and tuned the AFR with a MAP adjuster that i built.

Photojared

Glowing red exhaust manifold probably means your running it way lean; especially only at 2k RPM. Like GRohr said; wideband AF sensor will be your friend.

Clifford4.7

Will a adjustable map sensor work on a OBD2? and whos wideband do you guys recommend?

cliffpenick

Mine was glowing red at break in also. That's what they do, every body on jeepstrokers.com said that's what they do. I installed an aem wide band. no you can't run an adjustable map sensor on obd2 it adjusts automatically. My injectors were 24# and 68 mm throttle body. i don't think with 27# you would be running lean. Make sure you don't have any vacuum leaks and that your fuel pressure is good. Did you index your distributor correctly?

Clifford4.7

I have no vacuum pressure. Fuel pressure is 43 running, and the distributor was indexed correctly.and from what I know that the aem Wideband will just information correct?

GRohr

No vacuum pressure on your intake manifold? The wideband AFR sensor will just let you know how rich or lean you are running, it won't automatically fix anything but I am not exactly sure what you meant in the last post.

Clifford4.7

I have no vacuum leaks and 43 lbs of fuel pressure

GRohr

I really think that the wideband AFR will let you know how the fuel is doing and we can go from there. When you see how it is running, post the numbers and you can use all of us to help troubleshoot from there. It took me almost 2 months from drooping in the engine till I got the engine to run how I wanted it to so be patient and just remember that the outcome is well worth it.

cruiser54

I wonder if the catalytic converter is clogged?

Clifford4.7

How can we adjust the obd2?

GRohr

You should look at jeepstrokers and see how people there have done it with the odb2