Bucking & dying

[Dartay]

We have a 99 7.3L that has been acting up lately. The truck will be driving fine then suddenly the engine will start to miss and dies. It will start back up, but with the service engine light on. Sometimes you can get through the problem by romping on the accelerator. Gets grey or black smoke from the tailpipe. It acts as if it's not getting fuel. Checked the fuel filter, it's clean. Any ideas??

[Brian]

check the computer codes if you can, that will be the best way.

[Dartay]

we have, got a KAM error, a map sensor error, took it to the neighborhood shop, they did their vodoo, had us replace the pcm. It's still acting up. Husband drives it to work & back on the swing shift, just waiting for that midnight call to go pick him up.

[Brian]

some good advice will be coming along in a few hours, hold tight.

[Dartay]

Okay, Thanks! I've used this forum to gather info previously & it seems that there are some great minds at work here. I'll check back before I jet tonight.

[Deeno]

Originally Posted by Dartay

we have, got a KAM error, a map sensor error, took it to the neighborhood shop, they did their vodoo, had us replace the pcm. It's still acting up. Husband drives it to work & back on the swing shift, just waiting for that midnight call to go pick him up.

Hi Dartay, welcome to Powerstroke.org After replacing the pcm, does the check engine light still come on? Kinda sounds like the pcm may not have been the problem if it's still acting up. If the light is still coming on, I would pull the codes on it and go from there. May just be the map sensor:pray: On a further note, a KAM error code is normal if the pcm has been flashed with an aftermarket tune

[Dartay]

Thanks for the welcome! The light did not initally come back on, only after the problem reoccurred. But the next day when he took it back to the shop, the light was not on & it showed no codes with their scanner. We do have a Edge programmer, but we put it back in stock when the problems started (thinking it was maybe the programmer). He had it back to the shop again today & they poked & prodded & got more codes & are running them past the dealer. We just don't want to be throwing parts & cash (limited) at it.

[Deeno]

Originally Posted by Dartay

Thanks for the welcome! The light did not initally come back on, only after the problem reoccurred. But the next day when he took it back to the shop, the light was not on & it showed no codes with their scanner. We do have a Edge programmer, but we put it back in stock when the problems started (thinking it was maybe the programmer). He had it back to the shop again today & they poked & prodded & got more codes & are running them past the dealer. We just don't want to be throwing parts & cash (limited) at it.

I hear ya It doesn't take long to spend a lot of cash on these things if you're not carefull That KAM error code will set after you install the factory tune back in the pcm. KAM stands for (keep alive memory) If I'm not mistaking, KAM enables the pcm to remember the different operating parameters of the engine and everytime you change the tune, it erases that memory, setting that code. The pcm actually has to re-learn everything, but don't quote me on this. Marc, chime in anytime Haven't talked to ya in a while

[mschn99]

lol........im here....your close enough on the Kam deal....and as far as the problem, i would be looking at the map sensor. without the map sensor seeing boost, it will not allow fuel or air to be allowed into the cylender like you are demanding, causing the problem.....look at the rubber hose that comes off of the charge air manifold and runs to the blower motor box on the passanger side. that line goes from the charge air manifold to the Map sensor....inspect your wiring to the sensor and also check all your fuses just to be safe........Marc

[Dartay]

Thank you all for your help. We bit the bullet & took it to the dealer for a diagnostic. They recommended replacing the cam shaft sensor (apparently this is a frequent problem) and the EBP sensor & tube. The tube was blocked & the sensor was bad too. Lucky for us, we know the guy behind the parts counter & he got us a deal on the diagnostics and the parts.

We will continue to run stock for a week or so, just to make sure then it's back to the Edge.

Thanks again all!