Free Practice Questions for ASE T1 Gasoline Engines (Medium/Heavy Truck)
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Key Facts: ASE T1 Gasoline Engines (Medium/Heavy Truck) Exam
60
Total Questions (50 scored)
ASE Medium/Heavy Truck Study Guide (T1)
75 min
Time Limit (30 min for T1R Recert)
ASE Medium/Heavy Truck Study Guide (T1)
$62 + $34
Test Fee + Per-Order Registration
ASE Registration & Fees schedule
Not published
Fixed Passing Percentage
ASE public T1 test specifications, checked October 13, 2026
2 years
Required Work Experience
ASE Certification Need to Know
Prometric
Test Provider
ASE testing logistics
ASE lists the Medium/Heavy Truck Gasoline Engines (T1) certification test as a 60-question exam (50 scored questions plus 10 unscored research questions) with a 75-minute time limit, delivered in person at Prometric test centers (recertification test T1R has 25 scored questions in 30 minutes). ASE charges a $34 registration fee per order plus a $62 test fee ($96 total for a single test). A fixed passing percentage is not publicly published by ASE, and certification requires two years of relevant hands-on work experience (approved training credits vary by program, including two years for a completed accredited OEM-sponsored co-op). T1 is not required for Master Medium/Heavy Truck Technician status (which requires T2 through T8). This free practice bank provides 100 selected-response items across all eight official content areas.
Sample ASE T1 Gasoline Engines (Medium/Heavy Truck) Practice Questions
Try these sample questions to review concepts for the ASE T1 Gasoline Engines (Medium/Heavy Truck) exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1A medium-duty truck with a large-displacement gasoline engine has a rough idle and low power. A cylinder compression test shows one cylinder reading 90 psi while the others read about 155 psi. Which of the following is the MOST likely cause of the low reading?
2Technician A says a cylinder leakage (leak-down) test pinpoints where compression is escaping. Technician B says air heard at the throttle body or air intake during a leak-down test indicates a leaking intake valve. Who is correct?
3During a running compression test on a gasoline truck engine, the snap-throttle reading is much lower than the cranking compression reading on the same cylinder. This MOST likely indicates:
4A gasoline-powered medium truck has white smoke from the exhaust, coolant loss with no external leaks, and a sweet smell. The MOST likely cause is:
5A truck gasoline engine has a steady knocking noise that increases with load and is loudest at idle when warm. Disabling the suspected cylinder's ignition reduces the noise. This MOST likely indicates:
6Which condition would MOST likely cause low oil pressure at idle but acceptable pressure at higher RPM on a gasoline truck engine?
7A gasoline truck engine consumes oil but shows no external leaks and produces blue smoke mainly on deceleration after a sustained pull. The MOST likely cause is:
8A no-start gasoline truck engine cranks normally. Which step should be performed FIRST to logically narrow the cause?
9Technician A says a vacuum gauge reading that is low and steady can indicate late ignition/valve timing or an intake manifold leak. Technician B says a needle that drops regularly indicates a burned or leaking valve. Who is correct?
10A gasoline truck engine has an exhaust restriction (suspected plugged catalytic converter). Which symptom set is MOST consistent with this condition?
About the ASE T1 Gasoline Engines (Medium/Heavy Truck) Exam
ASE T1 — Gasoline Engines (Medium/Heavy Truck) certifies technicians who diagnose, service, and repair gasoline engines in Class 4 through Class 8 medium- and heavy-duty trucks. The test covers general engine diagnosis, cylinder head and valvetrain, engine block, lubrication and cooling, ignition, fuel/air/exhaust, emissions controls, and computerized engine controls.
Exam sponsor: ASE (National Institute for Automotive Service Excellence). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.
Assessment
50 scored multiple-choice (60 total incl. 10 unscored) (official ASE); this practice bank is 100 selected-response items
Time Limit
75 minutes
Passing Score
Fixed passing percentage not publicly published by ASE
Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.
Our practice resources: topics covered
We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.
General Engine Diagnosis
Verifying the driver concern and using compression, cylinder leakage, running compression, power balance, vacuum, exhaust smoke/noise, oil consumption, DMM/DSO/scan-tool, and starting/charging electrical diagnosis on medium/heavy-duty truck gasoline engines.
Cylinder Head & Valve Train Diagnosis & Repair
Burned/leaking valves, valve guide and stem seal wear, head thickness and warpage measurement, surface finish, hydraulic and mechanical lifters, rocker arms, pushrods, valve springs, and overhead camshaft service.
Engine Block Diagnosis & Repair
Cylinder bore measurement and honing, in-block camshaft and timing chain/gear service, bearing wear and clearance with Plastigauge, crankshaft endplay, select-fit bearings, piston ring end gap, vibration damper, and flywheel/flexplate runout.
Lubrication & Cooling Systems Diagnosis & Repair
Oil pressure testing, oil pump clearance and relief valves, oil cooler testing, thermostat operation, cooling-system pressure testing, coolant service and air bleeding, water pump, radiator, fan clutch operation, and gauges/warning indicators.
Ignition System Diagnosis & Repair
Primary and secondary circuit testing, coil swap and resistance testing, spark plug reading, secondary ignition scope analysis, misfire and ignition DTC diagnosis, CKP/CMP sensors, spark knock, and ICM/PCM control.
Fuel, Air Induction & Exhaust Systems Diagnosis & Repair
Fuel pressure and volume delivery, electric fuel pump circuits, fuel trim and DTC analysis, vacuum leaks, air filter restriction, exhaust backpressure, injector balance, LPG fuel systems, and electronic throttle control (TAC).
Emissions Control Systems Diagnosis & Repair
PCV, EGR, secondary air injection (AIR), catalytic converter efficiency, EVAP small/large leaks and purge/vent control, scan data and DTC analysis, and five-gas exhaust analysis.
Computerized Engine Controls Diagnosis & Repair
OBD-II monitors, enable criteria, freeze frame, and drive cycles; ECT, IAT, MAF, MAP, TPS, knock, and O2/AF sensor diagnosis; DMM voltage drop and DSO testing; PCM power/grounds, J2534 reprogramming, and interrelated systems.
Preparing for the ASE T1 Gasoline Engines (Medium/Heavy Truck) Exam
What You Need to Know
- Passing score: Fixed passing percentage not publicly published by ASE
- Assessment: 50 scored multiple-choice (60 total incl. 10 unscored) (official ASE); this practice bank is 100 selected-response items
- Time limit: 75 minutes
- Exam / certification fees: $62 test fee + $34 registration fee per order Official sources
Using Our Practice Resources
- Work through all 100 available questions
- Review every answer and explanation
- Track weak areas and revisit them
- Use our AI tutor for tough concepts
ASE T1 Gasoline Engines (Medium/Heavy Truck): Suggested Study Strategy
Frequently Asked Questions
How many questions are on the ASE T1 Gasoline Engines test?
ASE lists the Medium/Heavy Truck Gasoline Engines (T1) certification test with 60 total multiple-choice questions, of which 50 are scored and 10 are unscored research questions that do not count toward your score (the T1R recertification test has 25 scored questions and no research questions). This free practice bank provides 100 selected-response items so you can drill every content area more deeply than the live test length.
How much time do I get and how is ASE T1 scored?
ASE lists 75 minutes for initial T1 and 30 minutes for T1R. Its public T1 specifications do not state a fixed passing percentage or a guaranteed raw number of correct answers. ASE reports pass/fail and content-area performance, so answer every item and use the content-area results to identify study needs.
What does ASE T1 cost and what are the eligibility requirements?
A single T1 order costs $96 before applicable tax: $34 registration plus $62 for the test. Certification also requires the two-year Repair Technician experience requirement. ASE awards one year for completing an accredited program or passing three different Entry-Level tests, up to one year for other eligible training, and two years for completing an accredited OEM-sponsored co-op including its hands-on portion. These alternatives cannot be combined; ASE evaluates the documentation.
Is ASE T1 required for the Master Medium/Heavy Truck Technician certification?
No. ASE Certified Master Medium/Heavy Truck Technician status requires passing tests T2 through T8 (Diesel Engines, Drive Train, Brakes, Suspension & Steering, Electrical/Electronic Systems, HVAC, and Preventive Maintenance Inspection). T1 is a standalone specialty certification for technicians who service Class 4 through Class 8 commercial gasoline trucks, with related LPG applications discussed in our independent materials.
What content area should I study most for ASE T1?
General Engine Diagnosis is the largest area at 14 scored questions (28% of the test), followed by Computerized Engine Controls at 8 questions (16%), Ignition Systems at 6 questions (12%), and Fuel, Air Induction, and Exhaust Systems at 6 questions (12%). Weight your preparation toward systematic diagnostic strategy—compression, leak-down, vacuum, starting/charging voltage drop, scan-tool monitors, and fuel trims—because most T1 questions test how you isolate a fault.
What are the scheduling, cancellation, and retake rules for ASE T1?
Once you purchase an ASE test in myASE, you have 90 days from the purchase date to schedule and take the exam. Initial T1 tests must be taken in person at a Prometric test center (Prometric ProProctor remote testing is available for T1R recertification, not initial T1). Appointments cannot be changed or cancelled within 3 days of the test date, and after either a Pass or Fail result you must wait 30 full days before repurchasing and scheduling the same test.