Just to clarify- 92 and up f150's with 302's came factory with roller lifters. I have even seen one late 91 model that had them.

 

Chris,

I assume mine is OBDI, but as far as I can figure out uses all the same elements for the computer system as the OBDII. For example, my truck has the IAT sensor at the air box. I've only seen this on '95 and up trucks. At one point I thought all mass air trucks had this setup, but have heard of earlier CA trucks with mass air and the old style intake temp setup.

Then again, for all I know my truck is OBDII! Don't the II trucks use before and after cat O2 sensors? What would be an easy way to tell? I understand that diagnostic data is greater with OBDII, but does this mean a physically different plug?

Maybe one of these days I'll figure this truck out. Not long ago I thought all 5.0 '95s had mass air with the IAT sensor in the air box.

Either way, what changes took place with OBDII that would limit cam selection over OBDI? Just curious, as the 'Stang sites tend to have tuning problems in regards to timing, etc. but nothing in particular related to cam profile that I have seen.

 

Ok, I've read every reply to every reply and I'm a little
confused now.

I want a nice mild cam, 1500 to 5000 rpm range for some
more torque. I lost you all when the OB stuff started, why'd
you do that?

Should I call Comp or Crane and ask them? I've got no clue
whether existing setup is Hydraulic, Roller, don't know.

Figured nice cam, new lifters, timing chain, see ya, right?
vroom kinda thing

 

We do that to confuse non-members who freeload off this site. We discussed this at last weeks meeting, weren't you there?

The first cam listed on
this page is perfect for you. It's made by Crane.

Take care,
-Chris

 

The OBD I plug is located under the hood, by the drivers side hood hinge. Look under your hood, and if you see the thing that says EEC Self Test Connector in the picture below, then it's OBD I. Otherwise, it's OBD II, and the plug is under the dash.





Take care,
-Chris

 

Chris,

I wasn't serious about thinking my truck was OBDII, just pointing out all the strange differences I keep finding on mine. Actually my truck DOES also have some strange plug under the dash, though I have no idea what it is for!

I am still curious on what changes would affect the cam profiles. My understanding was that this is more affected by computer code than anything else, and that the difference between OBDI and II was not the large factor in the equation?

 

It's where you plug in the MILES sensor (Mother In Law Ejection Seat sensor).


I'm not an authority on OBD II, but my guy at Ford told me the ECM's used in OBD II have more difficulty with cam profiles not programmed originally. You can modify the ECM, but there is still more of a risk of it not responding correctly to the conditions some cam profiles would generate, and would be likely to interpret them as trouble, and try to compensate for them.

Take care,
-Chris