P0511 MAZDA -

Question

2003 MAZDA 3 WITH 2.3 WHEN COLD IN OPEN LOOP INJECTOR PULSE GO TO "00" THEN BACK UP. CAR WILL STALL UNTIL IT WARMS AND GO'S CLOSED LOOP. THEN IT'LL RUN ALL DAY BUT AS SOON AS YOU TOUCH THE GAS CODE 340 COMES UP. I CHANGED THE CENSER AND CHECKED WIRES STILL 340 CODE. BUT CAR WILL IDLE OK BUT HAS DEAD SPOTS WHEN THROTTLING UP AND DOWN???

Answer 1

P0340 Camshaft position circuit malfunction.

When a vehicle is in open loop the feed back are ignored until closed loop, You have a rational code, Check fuel pressure, specs are 50.8 - 59.4 psi, Also look check timing belt for proper position,