6.0 running a little odd LONG POST

nunan · March 11, 2011

hey guys,

ive been fixing one of my school buses, an 05 e450 with the 6.0. my whole fiasco started with a hot start issue. i tried to diag it with my genisys, but it doesnt refresh fast enough to check the ICP while cranking. so i took it for a long test drive, and monitored it with the scan tool, to find out that my EOT/ECT had a 30 degree difference. great. so i brought it over to danny at my old dealership and he verified that it was a HPO leak. while he had it, i asked him to check the injectors. turns out 6 of them were weak or just flat out not contributing. okay, no problem. if its broken i have to fix it.

so fast forward to today, after 8 injectors a HPOP fitting EGR/oil coolers and sitting almost 3 months working on and off on it (plowing the shop, plowing other schools, bus inspections, being on workmans comp for a week, and 2 holidays fell in during this time), i finally get it to fire up today. for the first 15 minutes she runs smooth as glass, idles nice and quiet and doesnt smoke at all. awesome. i go to rev it to 1500, and let off and she falls flat on her face and dies. crap.

so i get it restarted, but its not happy trying to start. sounds horrible, eventually fires up ( i think i may still have air in the system, but dont have the fuel pressure tester to check pressure or bleed it out, so i just did key on key off about 30 times) and runs, but misses a little bit. eventually she smooths out. let it idle for about 20 minutes while checking for leaks, parts blowing through the block, etc etc. i hook up my scan tool and check some PIDs. EOT was at 205 and ECT was at 165, this was just idling after roughly a half hour combined. ICP was at desired and so was IPR, FICM voltages looked good. battery was a little weak from sitting, but had them on chargers for about 2 hours before hand (seperated).

now at first i ran KOEO and it popped up with a cyl 8 contribution code, but i had heard the injectors cycle and none of them seemed weak (brand new). so i did the KOER, and it flagged the cyl 8. i cleared the code, did the KOER again and it didnt flag cyl 8. so now i'm confused.

also, the LPFP sounds like its whining, so idk if i'm getting good fuel pressure to the heads or not. minus buying the tool for fuel pressure on the 6.0 (we dont have any budget right now) is there anyway to check it without the tool? i'm not opposed to bringing it to the dealer and having them check it out for me..as i'm at my whits end with this truck.

sorry for the long post, just dont want to have so much time into this only to find out i screwed something up. so i guess all that background info leads to my question lol,

what would cause the truck to mis on inital startup and while cranking, and throw a cyl 8 contribution code but than go away? got new filters, injectors, coolers, standpipes, oil rails (o ring grooves were pitted oddly enough) LOF, STC fitting.

nunan · March 11, 2011

atleast its not leaking yet... oh well. time to go work on the t/a lol

Mbl35 · March 14, 2011

I would check the fuel pressure. Could you borrow the tester from sombody you know? I would test fp cold then let it warm up and take it on a nice whirl and moniter fuel pressure.

I work on lots of e-banger ambulances and had to replace a few fuel pumps lately. If the fuel pump is bad it's a good idea to put in the updated fuel pressure regulaltor.

Also before we had the fuel pressure tester i was on a test drive in an 06 bus that ran fine cold but after like a mile or so started running like crap and just shut off in the middle of the road and after ten minutes or so started up again and i was able to make it back to the shop, the fuel pump was failing when it got hot but the engine ran nice and smooth on cold start ups.

Bruce Amacker · March 15, 2011

hey guys,

I've been fixing one of my school buses, an 05 e450 with the 6.0. my whole fiasco started with a hot start issue. i tried to diag it with my genisys, but it doesn't refresh fast enough to check the ICP while cranking.

Backprobe the ICP and watch voltage, which is much more important than pressure anyway. It's hard to get at on an E-van but you could backprobe it at the PCM or tap the wire (ugh!).

so i took it for a long test drive, and monitored it with the scan tool, to find out that my EOT/ECT had a 30 degree difference. great. so i brought it over to Danny at my old dealership and he verified that it was a HPO leak.

Why would a 30 degree difference point to a HPO leak?

while he had it, i asked him to check the injectors. turns out 6 of them were weak or just flat out not contributing. okay, no problem. if its broken i have to fix it.

so fast forward to today, after 8 injectors a HPOP fitting EGR/oil coolers and sitting almost 3 months working on and off on it (plowing the shop, plowing other schools, bus inspections, being on workmans comp for a week, and 2 holidays fell in during this time), i finally get it to fire up today. for the first 15 minutes she runs smooth as glass, idles nice and quiet and doesn't smoke at all. awesome. i go to rev it to 1500, and let off and she falls flat on her face and dies. crap.

so i get it restarted, but its not happy trying to start. sounds horrible, eventually fires up ( i think i may still have air in the system, but don't have the fuel pressure tester to check pressure or bleed it out, so i just did key on key off about 30 times) and runs, but misses a little bit. eventually she smooths out. let it idle for about 20 minutes while checking for leaks, parts blowing through the block, etc etc. i hook up my scan tool and check some PIDs. EOT was at 205 and ECT was at 165, this was just idling after roughly a half hour combined. I

This REALLY does not add up and makes me want to think that the Genisys is lying. I've never seen a EOT/ECT spread like that idling in the shop. Hook up to it after a long cold soak and see if the two sensors agree within 3 degrees.

CP was at desired and so was IPR, FICM voltages looked good. battery was a little weak from sitting, but had them on chargers for about 2 hours before hand (separated).

now at first i ran KOEO and it popped up with a cyl 8 contribution code, but i had heard the injectors cycle and none of them seemed weak (brand new). so i did the KOER, and it flagged the cyl 8. i cleared the code, did the KOER again and it didn't flag cyl 8. so now i'm confused.

also, the LPFP sounds like its whining, so idk if I'm getting good fuel pressure to the heads or not. minus buying the tool for fuel pressure on the 6.0 (we don't have any budget right now) is there anyway to check it without the tool?

Pretty tough to check properly without the tool, but the tool is not expensive, just a bit hard to find. I bet you could borrow one from someone. It's just a banjo fitting.

http://www.forddoctorsdts.com/forums/ubb...age=1#Post13162

I'm not opposed to bringing it to the dealer and having them check it out for me..as I'm at my whits end with this truck.

sorry for the long post, just don't want to have so much time into this only to find out i screwed something up. so i guess all that background info leads to my question lol,

what would cause the truck to miss on initial startup and while cranking, and throw a cyl 8 contribution code but than go away? got new filters, injectors, coolers, standpipes, oil rails (o ring grooves were pitted oddly enough) LOF, STC fitting.