Powerchoker

[rollerstroker]

My 95 stroker is struggling to start in the mornings and is running rough. poor power starting off and is not shifting very well. i have a super-chip on it and i keep getting codes p0603 po235 po236 po500. I have ran cleaner through the oil and fuel with out any difference. please help me.

[backwoodsboy]

P0603 - Internal control module KAM error
P0236 - Turbo boost sensor A circuit performance
P0500 - Vehicle Speed Sensor (VSS) Malfunction
P0235 - Isn't actually a DTC that a 7.3 should throw. Assuming the superchip is misenterpretting P0236 and coming up with this code.

First code: Have you had your batteries disconnected recently? Generally this code is stored when batteries are disconnected or have died. Fairly common code, and nothing to be concerned with.
Second code: This would be a MAP (boost) sensor issue. Check MAP line and sensor connections. If connections are good, replace MAP sensor with known good unit.
Third Code: Check the VSS located on rear pumpkin, as well as all wiring leading to sensor. If wiring and connection are good, remove sensor and inspect tone ring. Replace sensor if needed.
Correcting these three codes should solve all of your issues. VSS controls PCM's ability to shift correctly, and MAP sensor controls fueling which would cause low power.

[jesilvas]

If you don't understand how the HEUI system works, then read first - How HEUI works and best to convert


Then, you'll know not to run just any kind of cleaner through the oil.

Also, read - Winter Operation, Hard Starting, Hissing Sound Etc...
Troubleshooting GPR & GP's

I highly doubt any of those codes are your issue. Possibly MAP, but doubt it.
You need to do a few things, and wouldn't hurt to address those codes too.
1. Have two good batteries. 850CCA minimum, and they need to be load tested separately to determine good or not.
2. Check battery connections, and make sure they're all clean, inside/out.
3. Probably good idea to check your GPR and GPs like I posted above.

Now, what is cold to you? Cause the truck should be fine to teens or maybe lower.
What oil are you using? You might wanna think about going to a 10W40 at least, if not a 5W40. Works much better in cold.

I bet after doing all that, you'll be fine.

[backwoodsboy]

.....because MAP and VSS have nothing to do with fueling or shifting

[jesilvas]

Struggling to start and running rough. Yes, it's possible those are the issues too. Mainly the shifting, you're correct. But usually winter threads like this are something else.

[Fordman247365]

Bad MAP/MAP line=No power

Bas VSS=Horse**** shifting

Cut and dried

[rollerstroker]

i have two brand new exide batts with new battery cables i made myself fresh. i use motorcraft 15w40 because of the high heat during the summer and cold winters. we are averaging in the high 30s temp wise also i noticed a burnt plastic smell this morning when trying to start it.

[creekfreak]

Check those UVCH if you smelled burning plastic...

[rollerstroker]

check the what

[ol_Blue97]

under valve cover harnes.. there are wires that run under your valve cover to your glow plugs and injectors.. if u smell burnt plastic id bet one of the plugs is melting... which can affect your injectors and cause rough running