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Uploaded on Oct 13, 2009
READ THIS BEFORE COMMENTING! This issue was solved....read on:
My car has an unusual problem. It gets the same fuel economy at 90MPH as it does at 60MPH and it doesn't like to start when cold. The malfunction indicator light is not on and there are no stored DTCs. Once the car is warm, it runs fine except for bad highway fuel economy. (21-23MPG instead of the usual 25-28MPG) .
I think we found the problem. The fuel pressure is out of the specified range. Chrysler says the fuel pressure on the LH platform cars should be 58PSI +/- 5PSI..... this car ranged from 36 to over 75 PSI. It's time for a new regulator. These cars have returnless fuel injection so the regulator is not on the fuel rail, rather it's built into the fuel pump itself. As the RPMs increase, the pressure stabilizes which explains the bad fuel economy at lower speeds and OK economy at high speed. Replacing the fuel pump assembly (and thus the regulator) fixed the economy issues.
The no start was a dirty IAC. The pintle was worn so I replaced the IAC motor assembly when I cleaned the throttle body.
The gauge is an Actron/Sunpro unit picked up at Sears for $40.
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