460 Ford Forum - View Single Post - '96 F 350 460 starts then dies instantly
View Single Post
post #13 of (permalink) Old 03-01-2019, 03:27 PM
The Mad Porter
Senior Member
 
The Mad Porter's Avatar
 
Join Date: Jan 2006
Location: Tacoma, WA.
Posts: 8,514
Mentioned: 0 Post(s)
Tagged: 2 Thread(s)
Quoted: 521 Post(s)
 
Cool

Quote:
Originally Posted by buddysharp View Post
1996 Ford F 350 has a connector under the dash that I'm using. I haven't looked for a connector under the hood. Your question got me researching and I found that there were some F 350 7.5L California trucks that were equipped with OBD II. Also found that some had the OBD II connector, like mine, but don't have OBD II capability. WTH Ford?

Addtl testing. Drove with MAF sensor disconnected. Started great, ran rough at low speed, fine at speed. Real time scanner data said that Bank 2 was rich and that MAF sensor had low flow (as expected since it was disconnected). Came home, truck still running, plugged in MAF. No change. Unplugged, no change. Turned off truck. Plugged in. Started and it barely loped and eventually stalled - no response to throttle. Unplugged MAF, truck started fine but idled rough.

Installed original MAF. Same results.

So I'm assuming with MAF plugged in, it is telling engine to lean out to the maximum. With MAF unplugged, engine is told to run rich. But if the MAF isn't faulty, then what is it?

Yes some Cali trucks were OBD ll, 1997 I believe.

Find the EEC IV connector under the hood and see if you can pull codes.

There was a Federal exemption for trucks over 8,500 gvw.

When you remove the MAF the ECM goes into limp in mode.

I have concerns with the ecm.



SJ

Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist & Aluminum heads from all sources.
Custom ground cams
See our products in the Vendor for sale section
Customized crate engines
ParklandAutoMachine.com
R-H-P.biz
"Parkland Performance Auto Machine" Formerly RHP
(253)-988-6648
http://www.facebook.com/Ppamllc
The Mad Porter is offline  
 
 
For the best viewing experience please update your browser to Google Chrome