Category Archive: Engine

Shaking Engine

Car Information:
Honda CRV
Year: 2002
Engine Size: 4 cylinder
Trans: Automatic

Issue/Question: I sent an email detailing my issues two weeks ago. It was related to a shimmy/shake in the engine compartment on acceleration between 20-25 mph only. Have you had a chance to review?

Answer: It may be a CV joint binding!

Magic Mechanic
1432 Lee Road OrlandoFL32804 USA 
 • (407) 298-7447

Engine Coolant Temp

Car Information:
Chevrolet
Year: 1991
Engine Size: 5.0 TBI
Trans: Automatic

Issue/Question: During very hot summer months, the engine coolant temperature is very high (even over heats sometimes), when the air condition is running while the engine is at idle and/or during stop and go traffic. I believe the engine has 180,000+ miles. Also, when the vehicle is at a full stop and the acellerater is fully pressed down (launched as though at a drag strip), there is a loud thud towards the rear of the vehicle (as though something has spacked the under carriage). I noticed this a week after running over a dead animal (possible deer) in the middle of the road on a pitch black highway.

Answer:
I would check for a bad flywheel/flex plate and a bad fan clutch

Issue/Question: Thank you Larry for your response. I meant to include that it my vehicle is a 1991 camaro rs with a 700R4 Transmission and the radiator fan is an electric fan that’s currently wired to turn on/off via a switch, not thermostat. Anyway, the electric fan remains running as long as it is not turned off via the driver. If my flywheel/flexplate is bad, then why does the loud “smack/thud” upon HARD ACCELERATION sound and feel as though it is at the REAR of the vehicle and not towards the front near the engine?

Answer:
Have you checked for a bent drive shaft?

Intermittent Misfire

Car Information:
Lexus ES300
Year: 2003
Engine Size: 6 Cylinder IMZFE
Trans: Automatic

Issue/Question: Our car has what I would call a “stumble” under acceleration that is very intermittent. It seems to do it as we leave the house in the morning and will do it at speed on the turnpike. I thought at first that it may be bad gas but using premium did not help. At this point it is just an annoyance, but we want to get it fixed. Sometimes it will go for miles without doing it. Will the onboard computer tell someone with appropriate diagnostic equipment what is going on? Any idea what it will cost to diagnose and fix? I appreciate you and what you do. Thanks.

Answer:
It’s possible the problem is an intermittent misfire. If that’s the case, it will require a good old fashion tune, plugs, coil insulators, throttle body, and MAF cleaning. Now if it has an ongoing misfire, you’re right, it may show up during a computer scan. I feel it’s a tune up issue because these engines have very few other problems if the oil services are performed regularly.

Driving Slow

Car Information:
Ford F-250
Year: 2004
Engine Size: 6.0 Diesel
Trans: Automatic

Issue/Question: The engine seems to run fine until I drive at slow speeds, feathering the throttle while in traffic. The idle increases, and the engine surges sometimes up to 1500 rpm. Then it falters and runs really rough. Then sometimes it will just quit altogether. The problem sets no codes in OBD and I’ve been running the scanner during the episodes with no code either. I’ve had this to Ford 3 times and they have replaced thousands of dollars in parts but cannot solve the problem. The engine is now out of warranty. I have gone through 55 pages of info on Edmunds.com and find many similar symptoms but no one has offered a solution yet. I’m now afraid to go out on the road towing my RV trailer with this thing. I can see why they call this a “Power Stroke Diesel” because that’s what it gives the owner. Can you help me? By the way I really enjoy your show.

Answer:
Their’s a oil supply line that feeds the injector system inside the motor, if the line leaks off pressure it will stall the motor like you describe. We will need to take an oil pressure test at the injector oil supply to verify if that is your issue.

O/2 Sensors

Car Information:
Ford Explorer
Year: 1988
Engine Size: 4.0L V6
Trans: Automatic

Issue/Question: 107k miles Engine Light on. Codes P0171 and P0174. I have read several things about this code. O2 sensors, intake manifold gasket leaking, mass air flow mechanism. I know that the only way to find the leak for sure is to run a vaccuum diagnostic check. My questions are as follows: What is the charge for the vaccuum diagnostic check and if the intake manifold gasket was faulty shouldn’t I see coolant drops on the garage floor? I do not see any.

Answer:
No it can leak vacuum and never leak any coolant, it depends on where the leak is. If we don’t do the repair after diagnostics we charge $84.50 for our time.

Cylinder Miss

Car Information:
Nissan Sentra
Year: 1993
Engine Size: 1.6
Trans: Automatic

Issue/Question:
120k miles, sat for 1 year, I started driving again with no problems for 2 months of driving. Now has 1 cylinder miss. Replaced cap rotor wires, plugs but still had miss. I found the dead cylinder and while engine was running I unplugged and plugged the wire plug to that fuel injector, did not make a difference so I replaced the fuel injector. Ran great for 2 days now the same cylinder has a miss again. . All 4 cylinders have great compression. Fuel pump? Fuel regulator? Please help.

Answer:
Its not a fuel delivery problem! I would check my valve clearance while the engine is missing, could be getting carbon trapped between a valve. Also make sure the injector terminal on #1 injector is clean and not green and cruddy, intermittent contact because of corrosion on this vintage Nissan is common.

Transmission Chatter/Shutter

Car Information:
Ford F-150 2WD
Year: 2007
Engine Size: 5.4
Transmission: Automatic

Issue/Problem:
I’m driving @ 55mph and slow to @ 20mph when I accelerate the transmission chatters/shutters twice then is fine. This happens only periodically, maybe once evey one or two hunderd miles or so. What is the likely cause and solution?

Answer:
Glazed clutch’s, Ford recommended Amsoil ATF and an additive called Smart Lube it helped de glaze the clutch’s.

Truck Problems

Car Information:
Dodge Dakota
Year: 1999
Engine Size: –
Trans: Automatic

Issue / Question:
When I try to start my 1999 Dodge Dakota, the ignition seems to turn but the engine doesn’t fully start. Sometimes I’ll wait a few hours, try to start it again, and it works. There is sufficient gas in the tank and the battery is fine. Do you have any suggestions?

Answer:
Its going to need to have a fuel pressure test to start with, If fuel pressure is correct you will then need to check for spark at the spark plugs. If you have both elements then it will need to be scanned to see it theirs a problem with a primary ignition or sensor input.

For professional auto repair and auto services in Orlando you can call our shop today at 407-629-2661.

Dodge Ram Engine Problems

Car Information:
Dodge Ram Van 1500
Year: 2001
Engine Size: 3.9L
Trans: Automatic

Issue / Question:
The engine cuts off on my way to work. It would not start. I turn the key on and the gauges do not move but the engine cranks yet it will not start? Do I need a new battery?

Answer:
Need to start with a fuel pressure test.

For professional auto repair and auto services in Orlando you can call our shop today at 407-629-2661.

Cadillac Deville Service Engine Light Codes

Car Information:
Cadillac Deville
Year: 1985
Engine Size: 401 Liter
Trans: Automatic

Issue / Question:
I was looking up some info for my vehicle and recalled the service engine light that comes on. I need to know what these code #’s mean:
E52
F12
F40
I do not know exactly what they mean and if you could give me some knowledge on these codes, then maybe I can fix my problem with the vehicle.

Answer:
We would start with checking for a major vacuum leak!

For professional auto repair and auto services in Orlando you can call our shop today at 407-629-2661.


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