99.5 F350 hiccup, bucks, and dies! please help

[aj198069]

Sorry if I am doing this wrong but I have never posted or used a forum before, i have used the search feature and can only find cps problems with my symptoms. I am at the end of my rope here beings I just bought the truck a month ago! My 99 7.3l runs ok until out of nowhere it will start to hiccup, and sometimes buck, it will also die sometimes but starts back up after turning it off and then back on. I have replaced the CPS twice in the last month one black one and one white/grey one. I have also replaced the icp, glow plugs and injectors. the truck is stock with the exception of the 160cc industrial injection injectors. but the truck had this problem before the new injectors so I have ruled that out. please help I have no idea where to continue from here. Also it does not matter the temperature outside or whether it is plugged in.

[greasyF250]

Did you replace the valve cover gaskets. The connector can be loose. What is your fuel pressure? When it hiccups and dies , does it just shut down or does it feel like its not getting fuel then dies. Do you have access to a scan tool. Check engine light on . Where are you located , maybe a member on here is close by to help you out.

[aj198069]

I did not replace the valve cover gaskets although I believe they should have done that when installing the new injectors, dont know the fuel pressure, when it does die it just shuts down. I do not have access to a scan tool although the last shop i picked it up from said it was still throwing a CPS code even though it has been replaced (they also said that it may need a PCM but I dont want to spend 500 bucks if they are not sure its that) the check engine light does come on but goes off most of the time once it is off and restarted until the next hiccup. I am located in parker CO. sorry I know its not alot of info but i work long days, dont have any tools other than basic and live in an apartment building that throws a fit if you are just topping off your washer fluid!

[XR-2001]

I recently went thru the same thing ( search for my posts on here)..... I replaced the ICP as it was leaking thru, rebuilt the IPR, replaced CPS, cleaned out the exhaust tube to sensor.

All this helped, but still had issues.

I later gfound the plug to the IPR was bad, replaced that. Still had a miss and was dropping cylinders on and off.

Pulled the valve cover and checked the wiring connections,, BIngo... there was a wire on the bottom of the outside part of the connector that was bare and was grounding out. Taped that up and all is well now.


RB

[greasyF250]

Definitely sounds like its electric in nature, by just shutting down ,instantly.