Best in town 5 year/50k mile warranty
Roadside
assistance
0% interest financing options available
ASE certified technicians
Get a dealer alternative estimate on your repair
Free shuttle service while we work on your vehicle
400+ 5 Star Reviews
400+
Reviews
Free Second Opinion Inspection.
100% Price Match Guarantee.
Free Second Opinion Inspection. 100% Price Match Guarantee.
Engine Diagnostics
Engine Diagnostics Built for Drivers Who Want Real Answers
Get a clear, smart breakdown of what your engine is doing, and what it needs, without confusion or guesswork.
We had them replace the engine on our 2002 Toyota Echo. It now runs like a charm, and they gave us a three year, 30,000 mile warranty on the engine and labor. We highly recommend Multnomah Automotive!
We had them replace the engine on our 2002 Toyota Echo. It now runs like a charm, and they gave us a three year, 30,000 mile warranty on the engine and labor. We highly recommend Multnomah Automotive!
Engine Diagnostic Services
Why Our Diagnostic Work Actually Makes a Difference
Some shops rush through inspections like they’re checking boxes, but that’s never been our style. When you bring your car to Multnomah Automotive, we look at everything. Strange noise? Power drop? Light on the dash that seems to have a mind of its own? We don’t shrug; we investigate. Our technicians take their time running in-depth tests, comparing data, and reviewing how each system interacts with the next. This means you get real explanations, not vague guesses.
We mix hands-on skill with advanced diagnostic tools to read what your engine is trying to tell us, long before a small issue turns into a stressful repair. It’s a thoughtful, thorough process that gives you confidence in your next decision, whether that’s a minor fix or a maintenance plan that keeps future problems away. Good information leads to good outcomes, and that’s exactly what our Engine Diagnostics service delivers every day.
Schedule An Engine Diagnostics Service Today!
When Your Car Is Asking for a Diagnostic Check
Cars rarely fail without warning, they just send signals most people don’t know how to interpret. That’s where a full Engine Diagnostics appointment makes all the difference. It turns those confusing hints into clear, actionable insights. Common signs you shouldn’t ignore:
Power that fades or fluctuates
Reasons for this may be a failing fuel pump causing inconsistent fuel delivery, clogged fuel injectors restricting proper combustion, a malfunctioning mass airflow sensor sending incorrect air-intake data to the ECU, ignition coil misfires, turbocharger boost leaks, or intermittent faults detected by the engine control module that trigger temporary limp-mode or timing/air-fuel adjustments.
Odd noises when accelerating
Odd noises when accelerating can be caused by issues such as engine knocking from an improper air-fuel mixture, worn or loose belts and pulleys under load, a failing turbocharger or boost leak, damaged motor mounts allowing excess movement, or exhaust system leaks that become louder during acceleration.
A dashboard lights that won’t stay off
Common reasons for these issues are persistent fault codes stored in the ECU, a failing sensor (like an oxygen sensor or mass airflow sensor) sending intermittent signals, loose or corroded electrical connections, low fluid levels that temporarily trigger alerts, or a problem that was reset but not fully repaired during diagnostics.
Rough idling or hesitations
This can be caused by issues such as worn spark plugs or ignition coils leading to misfires, a dirty throttle body restricting airflow, vacuum leaks disrupting the air-fuel mixture, failing fuel injectors delivering inconsistent fuel, or a malfunctioning sensor (like the mass airflow or coolant temperature sensor) sending incorrect data to the engine control unit.
ASE certified technicians
Get a dealer alternative estimate on your repair
Free shuttle service while we work on your vehicle
Driving should feel smooth, predictable, and stress-free. Our team helps you keep it that way by making sure your engine is understood, not ignored. We give you honest results, walk you through your options, and help you choose what’s right for your car and your budget.
Stop by Multnomah Automotive in Portland whenever you want diagnostics backed by expertise, clarity, and genuine care for your vehicle.
Experiences.
Real
Results.
Jason was so kind and gave me great advice even though my car was at another shop. He’s honest and sincere, and knows how to get his customers back on the road.
I had my brakes replaced here based on a recommendation from a coworker. They were helpful, honest, and got it done in one day!
Had my starter go out. They were able to diagnose and replace within two days despite being extremely busy. They also provided a full inspection without being pushy or trying to upsale. Good honest work. Thanks!
Dude these guys are great. They’ve never overcharged in my experience, and do a thorough job. Shout out to Jason for keeping me updated with repairs.
Jason helped fix multiple issues in my Toyota for $2000 less than what the dealer wanted. Jason and his team worked quickly and communicated clearly about issues that needed to be addressed. As long as Jason is there we’ll be bringing in our cars for service.
Amazing service and great management. Jason was awesome and quickly found the issue in my tire. I was in and out in about 10 minutes and for only $20. 10/10 auto shop experience
Wonderful and fast costumer service. Very accommodating and friendly. They take the time to explain the issues and are flexible with your schedule and time. Extremely reliable and trustworthy service and workers!
These guys are FAST! I needed an oil change and a catalytic converter shield installed on my Prius. They were pretty busy when I came to the shop by they still turned it around in a couple hours and gave great service. Shout out to Jason and his team, keep it up!
We had them replace the engine on our 2002 Toyota Echo. It now runs like a charm, and they gave us a three year, 30,000 mile warranty on the engine and labor. We highly recommend Multnomah Automotive!
My car’s tires blew out right near their shop, and they were super helpful in getting new tires in and replacing them within one day. Really helpful, and professional.
I love this place. The owner is straight up. This is an awesome shop. My repair was concise accurate. I trust them implicitly and it’s a drive for me AAA rated… Check them out Jason has your back.
The team here is fantastic. We had car troubles and they were fast and very honest about our options. They took detailed notes and photos about nest steps on repairs for our vehicle. We had such a great experience that they are now our permanent mechanics.
