Steve is awesome! I called with a pretty serious oil leak on my 7.3 power stroke. He got me in the next morning just to take a look at it even though they were booked out. Found the problem, said they couldn't get to it that day, We discussed the repair and he told me what parts I needed. I felt I could tackle it myself. I went and got the parts fixed the problem, issue resolved! They could have totally railed me for the repair and the parts, but Steve was straight up and honest. I value that tremendously! Thank you again! You are now my go to shop in the treasure Valley! read more

Deranged Diesel - Leaking, oil contaminated ICP sensor - Commercial Truck Repair Near Me - Boise, Idaho

I can't speak highly enough of Steve and Justin at Deranged. Their work is top notch. Nobody knows diesel engines better than them. Between a pre purchase inspection and servicing the vehicle afterwards my experience has been excellent. They may not be the cheapest shop in the Treasure Valley, but you get what you pay for. read more

Had a very difficult problem with DEF system. Justin spent hours of his time trying to repair inexpensively. Unfortunately it cost a lot in the end but Justin didn't charge me for all his time. As a retired aircraft mechanic was able to follow along on this painful auto repair journey. True professional mechanics read more

We had an emergency very close to closing time. They stayed to assess the problem and order parts so our pickup could be repaired. They were all so helpful. The pickup was repaired and works perfectly. The cost was fair, and we can never repay them for their kindness and being so accommodating. read more

So, I was shopping around for a diesel mechanic for my Chevy 3500HD and did not trust the dealerships. 5 minutes after i pulled up, they had my truck in the bay with the hood open, without an appointment. Although, they only changed out the fuel filter, I quickly gained confidence in Ben's ability to diagnose fuel issues. He is easy to talk to, honest, and gives sound advice. Now, I have a scheduled service on the books and a new go-to shop for all of my diesel work. read more

Steve was awesome to deal with, super helpful and had my truck diagnosed and fixed extremely fast.

This is another great American business with the proprietor at your service. Their entire staff is friendly and helpful and I would recommend them to anybody. read more

APRIL 2022 We were driving home from Arizona and our 2006 Dodge Ram DIESEL 2500 was losing power when accelerating. luckily for us we were 12 minutes from BOISE IDAHO. We looked up diesel repair shops and the reviews for DERANGED DIESEL were excellent. we called and Steve, the owner, BEN and LEE were amazing in getting our truck repaired. Steve also accomodated our fifth wheel on his lot for 2 days while our truck was being repaired. this shop is phenomenal, highly recommend it. the owner Steve and his two mechanics were easy to communicate with but most impressive was how quickly they got done to business to get the job completed so we could get back on the road to BRITISH COLUMBIA, CANADA. OUTSTANDING CUSTOMER SERVICE. Paul and Jan PEDERSON read more

Our van broke down in Boise and we were really lucky to end up at Deranged Diesel. They were so helpful and knowledgeable and honest. An honest mechanic! Worth their weight in gold. So grateful. read more

The check engine light on my 2013 VChevy Duramax Diesel was on. I took the truck to Steve. He informed me immediately the problems and fix everything (3/4 different problems). I could not be happier with the results. The truck is running like new and the cost was extremely reasonable. read more

Took the old 7.3 in for some work on Tuesday . Discussed with the mechanic (Ben) some probable issues. On Wednesday morning they called with a diagnosis and an estimate. Honestly it was far below what I was expecting. Picked the truck up Friday morning (It was done on Thursday) and the old farm truck runs like a champ. Thanks all for the GREAT service!!! read more

My boyfriend and I had such a great experience with repairs at Deranged Diesel in August 2017. The prices were reasonable, the repairs were done within a few days, and the mechanic who worked with us not only was a down to earth guy but also went beyond expectations and went around town to find the right parts that we needed to fix the problems (A/C leak, brake chamber leak) in a way that would save time/money and actually fix the core problem. The mechanic we brought the truck to back home in CA didn't even find the A/C leak and would have just refilled it, resulting in a temporarily working A/C that would have eventually leaked everything out again. The CA mechanic would also have unnecessarily replaced the brake chamber instead of a simpler repair. If we had ended up doing the repairs at that CA shop, we would have paid significantly more to get unnecessary work on the brake chamber and not get the necessary work for our A/C. If Deranged Diesel were located in the SF bay area they would be my go to shop, hands down, zero hesitation! Hell, if I took a cross country trip, I'd be tempted to visit Boise just to get repairs or maintenance done here. Well, not just for that reason, there's also finally floating the Boise River and the omftasty bacon at BACON. But weirdly enough, those 3 points actually make a pretty damn compelling case for putting Boise on the cross country trip list. Who the f* knew that excellent truck repair™ would be good for tourism? read more

Deranged was recommended to me by two diesel mechanics as the place to go for my 1999 F250 with a 7.3 Powerstroke. They were fast, easy to work with, and efficient. They diagnosed my oil leaks and fixed them quickly. They made suggestions on other repairs and did only what we agreed upon. They know their stuff and delivered. If I could give them 10 stars I would. read more

I was driving from Reno to Boise to drop my son off for college. If it's not stressful enough dropping your kid off for college, add vehicle problems on top of it. We were about 3 hours out of Boise and my 95 power stroke started dumping diesel from the fuel pump. Stressing if we were even going to make it or not as well as wondering if we were going to be able to find someone to repair it quickly to get back to Reno on Monday for work. Looking on yelp for a repair shop as we were diving and we were very lucky coming across Deranged diesel. I left my truck in his lot that night and came back the next morning when he opened to see that they were obviously very busy with all of the vehicles already in his shop to be repaired. I walked up to the desk to meet Steve to explain my situation with him and I could see in his face of how busy he was but with a big sigh he said "we'll take care of you". I was at his mercy for what ever he wanted to charge and I was expecting a big bill. Not only did Steve not gouge me when he could have, he went out of his way to get the fuel pump covered under warrantee since I just had it replaced just over a year ago and saved me a ton of money. Steve went way out of his way to help us and honestly if I have more work to be done on my truck in the future I will probably wait till I go visit my son and take it to Deranged Diesel to do the work. Thank you Steve! It is refreshing to know there are still honest, trustworthy, good people businesses still out there. read more