robp823 Posted June 18, 2009 Share Posted June 18, 2009 I have a 95 f-450 rollback that came in with the complaint of stalls every once in a while when he hits around 2,000 rpm then wont start back up but if you let it sit for about 5 minutes it will.Ran self test had P0340 P0344 and P1212 non continous.Cleared codes and drove around parking lot for a bit. Then i said screw it and decided to road test it, if it dies, it dies. I had NGS with me and watching pids RPM,ICP,IPR and DTC count. I dont get alot of 7.3 so i was unsure of normal values but while driving the highest the IPR went was 33% around WOT and lowest was 7% when decel.At idle IPR was around 12% to 14% and icp was around 570-630 psi. I had an RPM signal so CMP was doing its job. So im driving down the road and all of a sudden it dies. Pulled over and watching pids while trying to crank ICP was at 0,IPR 14% did not change at all while cranking, and 0 RPM on NGS and RPM tach did not move either.I let it sit for about 5 minutes and boom started right up with codes P0340 and P1212 in memory. Any help appreciated! Quote Link to comment Share on other sites More sharing options...
Bruce Amacker Posted June 18, 2009 Share Posted June 18, 2009 Don't condemn the CMP because of the codes, as cranking almost any PSD for 20-30 seconds in a no-start situation will set false CMP codes. IPR should be 9-11% at a hot idle, so yours is just outside of OK, but probably not your problem. The injector o-rings leaking slightly could cause this. IPR at a max of 33% is low also, and I don't know why, unless it has a biased ICP sensor. Concentrate on ICPV, not ICP, when diagnosing any problem on a PSD. The same numbers apply for 6.0 vs. 7.3: .18v to .24v KOEO, .8v to enable the injectors. It died and did not show RPM while cranking, so I would concentrate on the CMP and circuit for a start. Check the CMP color, harness plug, harness near the fan belt, and change the CMP if it all looks OK. Good Luck! Quote Link to comment Share on other sites More sharing options...
robp823 Posted June 18, 2009 Author Share Posted June 18, 2009 Had an extra cmp tossed it in seems to have fixed it thanks bruce also truck has a slight miss but pass koer cylinder contribution. no other codes Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.