Mechanics

V6 IDLES ROUGH AT FIRST & BACKFIRES UNTIL WARM

1985 Pontiac Fiero • 90,000 miles

When first started it idles a little rough but not bad. Stays running. It will backfire 3 or 4 times when getting on it for the first couple miles. After that idles & runs fine. Lacks a little power when getting on it at the end of each shift. Replaced plugs, wires, cap, PCV & rotor @ 89,000. Problem just started a month ago. Any ideas?
Avatar
Packerfan1
August 5, 2012.



Could be running lean, the coolant sensor could be bad, could be injectors. A shop with a scan tool can monitor the sensors to see which one is out of parameters.

Roy