Question # 36

An engine runs rough at idle but smooths out at higher RPM. Fuel trims are high at idle, normal at cruise. What is MOST likely?

Options:

A.

Vacuum leak

B.

Restricted fuel filter

C.

Worn ignition coil

D.

Failing catalytic converter

Viewing question 36 out of 72 questions
Industry research shows that students who utilize T Series practice tests are significantly more likely to pass exam.


Our free T Series practice questions act as a diagnostic tool to give you a clear snapshot of your Automotive Service Excellence: Medium-Heavy Truck series readiness. Discover which topics are your strengths and, more importantly, which critical topics require your immediate attention.