'98 Nissan Frontier 2.4 2wheel drive pickup single cab. What causes the motor at a constant speed to lope (motor goes up and down) Done replaced ,fuel pump,throttle position sensor,the whole distibutor, and had a diagnostic test done which found nothing.but the motor still lopes.Can you help me
Engine: 2.4 liter
replaced fuel pump,throttle position sensor,whole new distibutor,and had a diagnostic test done which returned nothing
Hi my name's Mike thanks for the question!
Well a common problem for those trucks is the egr ports on the intake manifold get clogged and can cause drivability concerns not to mention it might not pass a smog test. If you remove the port plugs and clean out the passages that usually helps.
No Did not help, Motor still lopes(up and down)Replaced crank sensor also nothing is working what is wrong with this truck
have you checked the IAC/AAC valve yet?