Mechanics

PONTIAC GRAND AM RPM PROBLEM

1993 Pontiac Grand Am • 140,000 miles

It's a 3.3L SE and I was wondering what could cause low RPM engine loping in park and neutral only. I just replaced the park/neutral switch and granted it could use a bit of adjusting but other than that i'm not sure what is causing it. I haven't checked the EGR or PCV valves because I took it to an o'reilly's and put an OBD on it and it gave a code for the park/neutral switch. Yet here it is still loping between 600-1400 RPM's
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Xaphan
March 6, 2013.



Most likely a vacuum leak. Check the fuel pressure regulator for ruptured diaphram.

Roy

Would that only cause loping for park and neutral? It drives just fine not even a stutter

Tiny
Xaphan
Mar 6, 2013.