P0190 code

Although unlikely, the FPDM may be going into thermal shutdown.
To rule this out, I would take the cover off and point a 12v fan at it. If the problems go away, you need a modified FPDM
 
Well I've used two different fpdms with the same result....granted they were not modified but the 2nd one I left exposed. And the car ran fine for 3 years prior to the first incident last summer. The problem is that it's so intermittent...it's happened maybe 3 times this summer and twice last summer. Never in the winter. I guess the trunk could be getting hot enough but for two different ones to act the same...odd. FBM has offered to loan me a modified one. I guess I can try it but with the weather cooling it will be hard to know if it solved anything.
 
I couldn't tell you if mine got solved by going return fuel or having dramatically reduced my under hood temps from an over spun Trilogy to a Procharger.

But with the FPDM offline now I obviously haven't had a single issue.

For me I really want to say it was my IATS. They were beyond ridiculous to the point I was actually melting and warping a couple of under hood items..


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justbob said:
I couldn't tell you if mine got solved by going return fuel or having dramatically reduced my under hood temps from an over spun Trilogy to a Procharger.

But with the FPDM offline now I obviously haven't had a single issue.

For me I really want to say it was my IATS. They were beyond ridiculous to the point I was actually melting and warping a couple of under hood items..


Sent from my iPhone using Tapatalk
Click to expand...

Interesting....So I started monitoring my IAT's along with my FPSI. In stop/go traffic yesterday with 90 deg temps, the IAT's sat around 145 deg F. That drove the FPSI to 60 PSI, assuming I guess from my tune. I remember in an earlier post by Zack that some tuners adjust FPSI to IAT and some lock it at 40 PSI...Evidently mine is adjusting.

Once I got the car to freeway speed, the IAT's quickly dropped to around 98 deg's, and the FPSI declined to around 48 to 50PSI. Could it be that my tune is just putting too much stress on my Fuel Pump to run higher PSI at higher temps and eventually overheats? Is there anything I should be looking at in the intercooler system or is 145 Deg F normal. I googled a few past posts on the subject and it was inconclusive as to what 'normal' IAT's would be on a trilogy setup.
 
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