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There is no aftermarket chip sitting in/on this engine.

I've had it to the dealership and they flashed it (I was told replaced the computer unit but the record doesn't reflect that).

When they were done, it ran like a dream but has since reverted to it's old behavior (very rough idle, surge at startup, and inconsistant power & smoke).

I decided to see what might be the issue by buying a computer software diagnostics unit to place on my laptop and checking via the port in the cab.

When I started up and turned on the monitor, what I saw was spiking in a number of areas: engine temp, manfold pressure, etc. Is this a computer unit needing to be replaced? Would a simple reflash fix it? How serious does the issue sound?

Should I show the graphs to the dealership or just tell them it is running rough? Does my placing the monitor on the unit put me at risk (the monitor I have is capable of resetting the Service Engine light, but I haven't done that)?

Even though the engine behavior has smoothed out, I think I should take some action on this.?

Lots of questions.

Thank you!
RJ

if the SES is on, what are the codes ?

Could be something as simple as a loose ground wire. check both sides of the lower engine block, any wire terminating at a bolt on the block, lossen and retighten.

If I recall there are like 4 on each side. Something easy you can do yourself.

Kevin

There were SES codes before I took it in and the PCM was worked on but none since returning. A temperature code was in the cue but hasn't turned up SES at this point and I haven't taken a look since the reading I mentioned in the first message (that has been about a week).

Your suggestion is the best and most logical I've heard.

MOST APPRECIATIVE of your feedback!!!!

I suspect this is the issue ... but I could have looked and had techs looking ad infinitum had you not responded.

Thank you for the feedback!

RJ