Start starts, idles at 900 RPMs. Short term fuel trims indicate rich fuel condition. Long term zero.
Cleaned throttle body, tested MAF, IAC, EGR, leak tested with smoke machine.
Slight leak from EGR although diaphragm holds vacuum.
Fuel pressure at 60 PSI with key on engine off then maxes at 65 PSI. Vacuum to regulator good. No change in rpm when hose pulled. No gas coming out of vacuum port when vacuum applied. No change in RPMs when vacuum hose disconnected. Suspect frozen pressure regulator stuck open or obstruction in return line.
Can overpressure cause engine to stall when going from idle to drive. Only way to move car is revving engine and shift into drive. Not good.
Only one code p1504.
have the same problem?
Thursday, November 11th, 2021 AT 7:23 AM