we changed the fuel pump and fuel filter,checked MAF operationa and it checked out ok.checked distributor and cap rotor and plug wireschecked fuel pressure w/ new pump (ok),checked TPS and MAP sensor, car looses power when it reaches 37 to 40 miles per hour acts as though it were starving for gas,what can it be? thhere are no codes stored in ecm.
Nissan Q&AAsk Your Question
1997 Nissan Sentra Question: runs good at idle and atlow rpms,but rattles and backfires when its revved
Answer #1your.mechanic November 27, 2012, 21:21Master
possibly timing issue
Answer #2pushrod November 28, 2012, 01:02Master
Check for exhaust restriction. Possibly loose catalyst in converer.
Answer #3Greg's Orange Auto (11856 Answers) , Orange, CA - (714) 361-9386globalhelper November 28, 2012, 06:35Master
could be fuel pressure to low or several other issues as stated.