This one has the local mechanics stumped. Not willing to pay dealer rates for diagnosis yet, so I'm looking for some help here.
The car died sitting at a light one day - would crank but not start. Police pushed it off to the side of the road. Waited for a tow. By the time the tow arrived, it magically started up and they drove it on and off the flatbed. Started once in the driveway but then not again. After a lot of troubleshooting, and verification that the fuel pump was not running, we replaced the fuel pump. Still wouldn't start, stored a P0191 code.
Bypassed the intertia switch and it fired right up. But there is still a problem but the symptoms are slightly different, persistent P0191 code and now a P0174 (lean) code.
There's a hesitation off idle and it's a bit lethargic at random. After driving for a period of time, it will not restart unless you let it sit for at least a few hours. We replaced the fuel pressure/temp sensor to no avail. The car does have a fuel pump driver module mounted to the RH C-pillar, though few parts sites list one for this car. We were thinking of replacing that next, but there is one odd symptom that we can't figure out. When it's cranking and not starting the pump is definitely running. If we crack open a line we'll get a blast of air, then fuel, and then it will run. It does this when it's cold so it's not vapor lock.
Where could it be getting air from? There are no EVAP
codes, though the EVAP
monitor may not have run yet given the fact that we haven't been able to drive it much because of these fuel issues.
Any advice would be greatly appreciated!