daras6909
Member
Ok so the car tuned a while back, makes 280whp on mustang dyno. And while they were at it they replaced the coolant temp sensor and o2 sensor. Before the tune it was giving trouble starting but would eventually fire up. For about 2 months after the tune everything was perfect. Now as the weather has gotten colder I used to get idle surge and it would idle between 1500-2000 rpm and it would just rev and settle for about 20 seconds...then it would go down to 1k rpm and smooth out, last month it stopped doing that and would run fine upon initial start up. Then the CEL would come on & it started idling at 700-900 rpm and idle exceptionally rough and would stall a few times. Saturday it was 16 degrees wen I was trying to leave for work & it would not start(took the girls car in). Got home at noon and it was 37 degrees out and fired up.on first try. And come Monday morning @ 14 degrees out wouldn't start...got home and its 34 degrees out and still wont start.
Im just looking for possible routes to start searching for this issue. She cranks like an animal and I have proper fuel pressure.
Im just looking for possible routes to start searching for this issue. She cranks like an animal and I have proper fuel pressure.