Misfires, oil leaks, rough idle, noises you have not heard before. We test to find the cause first, so you pay to fix the problem instead of guessing at it.
Winter Haven
During an internal engine inspection, the technician found a major amount of oil in cylinder #2.
Read the full jobHaines City
The vacuum pump was found to be leaking oil.
Read the full jobSebring
The technician started with an initial assessment at no charge, and the team kept the service manager updated.
Read the full jobWinter Haven
The technician started with an initial assessment at no charge to look into the dash lights and the slow-sounding idle.
Read the full jobHaines City
The technician at our Haines City shop performed an initial assessment and an electrical diagnosis (check engine light on communication codes).
Read the full jobHaines City
After the repair, the vehicle no longer emitted smoke from under the hood, resolving the customer's primary concern.
Read the full jobEngine repair covers a lot of ground, and almost all of it starts with the same question: what is actually wrong? An engine that misfires, idles rough, burns oil, or makes a noise you have not heard before is telling you something. Our job is to read that correctly before anyone starts replacing parts.
So we diagnose first. That means pulling codes, but a code points at a system, not at a part. A misfire code on cylinder three tells us which cylinder, not whether the cause is a coil, a plug, an injector, a vacuum leak, or low compression in that hole. Fuel trims, compression, spark, vacuum, and watching what the engine does under load will separate those in a way a code reader on its own never can.
Oil leaks work the same way. Oil runs downhill before it drips, so where it lands is rarely where it came from. A valve cover gasket, a rear main seal, and an oil cooler line can all leave the same spot on your driveway, and they are three very different repairs. We clean the area, run the engine, and confirm the source before we quote anything.
Noises get sorted by where they come from and when they show up. A tick that only appears on a cold morning is a different conversation from a knock that gets louder with rpm, and the second one we want to look at sooner.
A couple of engine problems have their own diagnostic path and their own pages: head gaskets and timing components. If your symptoms point that direction, we will tell you and take it there.
Most engines that come through our bays get repaired, not replaced. Replacement only enters the conversation when the cost of the repair stops making sense against what the vehicle is worth to you, and that is a decision we walk through with you rather than make for you.
8 recent jobs across 3 cities by our technicians.
Recent work
Recent work
Recent work
4.8 (2,060) as of Oct 20264.8 out of 5, from 2,060 Google reviews, as of October 2026
31600 U.S. 27
Mon to Fri, 7:30 AM to 5:30 PM
4.8 (161) as of Oct 20264.8 out of 5, from 161 Google reviews, as of October 2026
101 North Scenic Highway
Mon to Fri, 7:30 AM to 5:30 PM
4.8 (537) as of Oct 20264.8 out of 5, from 537 Google reviews, as of October 2026
323 North Scenic Highway
Mon to Fri, 7:30 AM to 5:30 PM
4.6 (170) as of Oct 20264.6 out of 5, from 170 Google reviews, as of October 2026
435 North Orange Street
Mon to Fri, 7:30 AM to 5:30 PM
4.9 (31) as of Oct 20264.9 out of 5, from 31 Google reviews, as of October 2026
201 North 6th Avenue
Mon to Fri, 7:30 AM to 5:30 PM
4.8 (586) as of Oct 20264.8 out of 5, from 586 Google reviews, as of October 2026
5100 Dundee Road
Mon to Fri, 7:30 AM to 5:30 PM
Our experts diagnose and resolve any issue.
A misfire bad enough to feel at idle often smooths out at speed, which is why people live with it for months. The cause can be ignition, fuel, or a vacuum leak, and only testing tells those apart.
Oil travels along the block and the pan before it drips, so the puddle is a clue rather than an answer. We clean, run it, and trace the leak back to the actual gasket or seal.
Lost power with a light usually means the computer is compensating for something it can measure. Reading live data while the engine is working is what narrows it down.
A tick that follows engine speed points at the valvetrain, the injectors, or an exhaust leak at the manifold. Where it is loudest and whether it changes as the engine warms up shortens that list fast.
Oil either leaks out or gets burned through the engine. An external leak leaves evidence, and consumption with no leak points toward valve seals, rings, or a PCV problem.
Long cranking is more often fuel pressure, ignition, or a sensor than a battery. It usually shows up cold or after the car has sat overnight, which is a useful clue on its own.
Great shop & great team, from service writers to the mechanics. Although I live in Winter Haven, I chose this location because they are specifically equipped to handle my F350 dually. Since then I have been bringing my other vehicle (an older ford ranger) to Mike & his team when I need repairs. Recently my timing chains began to rattle on my ford ranger so I contacted Mike & Rebecca to see if they would be able to get the job done for me. They gave me a quote, got my truck in & repaired within 1 full work day. They provided photos of each step of the repairs they did (at my request) & emailed gladly them to me. Rebecca drove me home when I dropped my truck off, & they updated me on their progress by text while they were doing the repairs. They also notified me by text as soon as my truck was done & ready to go. Mike & his team do an excellent job & strive very diligently to take care of customers with pride, courtesy, & outstanding professionalism that other shops don’t provide these days.
Eric Ulmer
Verified Google Review
Huge shoutout to the team at Johnny’s Automotive for an amazing experience rebuilding my engine. The whole process was smooth, transparent, and professional from start to finish. Special thanks to Joel for managing everything and keeping me updated every step of the way, and to Dayna for top-tier customer service. Friendly and attentive! Shoutout to the guys that worked on my car, I can’t thank them enough! I’m a customer for life! You can tell they genuinely care about their customers and their work. Highly recommend this shop if you want the job done right the first time. 5 stars all the way ⭐️⭐️⭐️⭐️⭐️
Josh Suka
Verified Google Review
Fabulous crew very professional at Jonny’s with Mike at the helm our truck had serious motor issues fixed with warranty, fantastic job
Charles Kelly
Verified Google Review
Very professional, clean environment. I dropped off my vehicle for a engine issue. The team and their mechanic was in constant communication with me to let me know the issue and the cost. I found this place that gives honest, great work and reasonable price that I can trust. I will continue to take my vehicle if any other issues comes up and updates for prevented maintenance. Thank you.
Felix Blanco
Verified Google Review
I was dealing with a big problem on my 2007 Chevy Suburban with 431,820 miles. It was idling rough with a misfire (lean code on bank 2), and Johnny’s took the time to find out the source of a three month ordeal. You guys totally ROCK! My car is running better then ever, and no check engine light. The team at Johnny’s is very friendly, responsive, upfront, thorough, and honest. Genuinely excited to bring my car back to them next time it hiccups. From start to finish 100% satisfied.
d'Aquin Reese
Verified Google Review
I had a rebuild Motor put in my truck but it wasn't driving smoothly, I went to a shop and cost me two thousand and it still wasn't running right, for some reason that shop couldn't figure out what was wrong. I read the reviews Johnny's automotive and took it to them and they figure out what the problem was and got it fixed properly. I will recommend them to everyone.
Bill Taylor
Verified Google Review
Explore our other auto repair services.
Squealing or grinding brakes? Complete brake inspection, pads, rotors, and fluid service for safe stopping power.
Learn moreAvoid getting stranded with professional battery testing, terminal cleaning, and replacement using reliable, warranty-backed batteries.
Learn moreLoud exhaust or failing catalytic converter? We repair and replace mufflers, pipes, catalytic converters, and exhaust manifolds.
Learn moreCommon questions about our engine repair.
We can usually tell you what is likely and what it is not, which helps you decide how urgent it is. What we will not do is name a part and a price sight unseen. Too many engine symptoms have four or five possible causes that only testing separates.
Not always, and we will tell you when it can wait. Some codes are emissions related and will only cost you at inspection time, while others mean the engine is running in a way that damages something else the longer you drive it. The point of diagnosing it is knowing which one you have.
We send a digital inspection to your phone with photos of what we found, so you are looking at your own engine instead of a line item on a page. If we tell you a gasket is weeping or a boot is split, you can see it yourself before you approve anything.
We talk through when the symptom happens, then run the testing that concern actually calls for. Before any of it starts, you will know what we are doing and you approve it. Diagnosis and repair are two separate decisions, and you are not committed to the second one by agreeing to the first.
Yes. Repairs we perform carry a 36 month, 36,000 mile nationwide warranty, so it holds up whether you are home in Haines City or three states away. Our technicians are ASE certified, and we are happy to put the details of your coverage in writing with the estimate.
ASE Certified Technicians
ASE certified techs working on your vehicle
Flexible Drop-Off Hours
Convenient service options
20+ Years
2 decades of trusted service
