1993 Pontiac Grand Am Repair Question
Topics covered: Rpm, Engine, Fuel pressure.
Mileage: 140,000 miles.
Mileage: 140,000 miles.
Asked on March 6, 2013
Pontiac Grand Am Rpm Problem
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
Asked by XaphanAnswer
Replied on March 6, 2013
most likely a vacuum leak. check the fuel pressure regulator for ruptured diaphram.
Roy
Replied on March 6, 2013
Would that only cause loping for park and neutral? It drives just fine not even a stutter