Q: Loss of power when gas pedal is pressed all the way down, but only when the car is warm.

asked by on January 28, 2018

When my car warms up and I am driving more aggressivly, the car seems to lose power when the gas pedal is all the way down and it accelerates slower than normal for a V8. It makes a weird, fast "putt putt putt" noise and wont accelerate like it used to. If I Iet the pedal out a little, it stops. Once the power problem starts, the oil temp gauge drops when I come to complete stops, the second I give the car gas, it pops back up to normal again. It also sounds like its misfiring slightly at an idle, but only when the symptoms start.. At stop lights it gurgles almost when you press the gas and then the car starts to go. Ive cleaned my MAF, put fuel cleaner in the gas, and checked the spark plugs to see if i was running rich or lean and nothing is abnormal. Theres no check engine light, and no lights come on when driving. If the car is cold, it accelerates and runs normally up until I really push it. The car also occasionally stalls and backfires when trying to start it.

My car has 136000 miles.
My car has a manual transmission.

Ignition Coil Replacement $116.03 - $516.36 Get a Quote
Fuel Injector Replacement $379.42 - $3631.88 Get a Quote

This may be a sign of a faulty ignition coil. Ignition coils are coated with a varnish-like insulation that becomes brittle over time after being stretched then contracted repeatedly. The insulation develops small fractures that open when heated and close when cooled. When open, they allow shorting of coil windings and decrease or eliminate the coil’s ability to function. This type of temperature cycling happens because every time you shut the engine off, the fan stops running, the coolant stops flowing and the temperature under the hood rises. Every time you start the engine again the coolant flows, the fans turn on, and the temperature drops. When this heat dissipates and is absorbed under the hood, it is trapped causing this cycling effect. Other components that contain heat sensitive materials include parts like fuel injectors, igniters, and some sensors. Any of these may be potentially subject to this same kind of heat cycling problem which can be very difficult to trace. I would recommend having an expert from YourMechanic come to your location to take a look at your vehicle.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

What others are asking

Engine power loss and odor from the exhaust

Hello. The symptoms you are experiencing can be caused by a wide variety of issues. It may be possible that the vehicle has suffered a component failure, perhaps at the fuel or ignition systems, which is setting off the light...

Motor rebuild. Loss of power when driving. Knock coming from top end.

Hey there. The valve tappets are under the camshafts, and in order to replace the bad ones, or ones that need clearance adjustments by replacing lash adjuster, you would need to have camshafts removed. This is a major job to...

Large clunk in what sounds like front of car

Hey there. This noise is an indication of movement of the suspension. The first thing to check would be the lower control bushings on both sides of the car should be checked for movement by supporting the vehicle off the...

can i get pitman arm and idler arm fixed?

Hi there. The Pitman Arm & Idler Arm are essentially the same component; however, they operate on opposite sides of the vehicle. The idler arm operates on the passenger side, while the pitman arm connects the steering box to the...

Rough idle

Hi There, A rough idle may be caused by many different things such as low fuel pressure, low voltage to the fuel injectors, dirty fuel injectors, a vacuum leak, a faulty Oxygen sensor or a dirty or failing idle air...

replacement of catalytic converter

I wouldn't assume that the rear converter is bad unless the mechanic actually performed a diagnostic on the converter AND then explained to you what was done, what was found and WHY the solution is to replace the converter. If...

oil is entering through throttle body and smoking from exhaust after pcv valve

Hello there, a few different faults can cause oil to be burned and white smoke to be seen. The most common would be excessive blow by, an intake leak, failed PCV valve or valve stem seal. A qualified technician...

no power on car unless the gas is floored

Hello. It is possible that the timing belt and catalytic converter are damaged at the same time. Or for the same reasons. If the belt is ripping up, you should stop driving the vehicle ASAP as if it brakes while...

Shifting

If you have no reverse gear, it's probably pointless to diagnose the other issues. A known, common issue in this transmission (you probably have the Ford 5R110) is breakage of a snap ring on the Low/Reverse one way clutch. That...

Related articles

A Buyer’s Guide to the 2007 Ford Crown Victoria
This This enduring Ford classic enjoyed a nearly two-decade run before being discontinued from the retail market with the 2007 model-year being the last. Ever-popular with law enforcement (for whom models continued in production through 2011), and senior citizens, the...
A Buyer’s Guide to the 2012 Ford F-350
With With Ford’s stiffest chassis to date, the 2012 F-350 is one of the most reliable heavy-duty pickup trucks on the market today. With the quiet cabin and plush ride, though, you’ll feel like you’re driving in the comfort of...
The Best Used Cars to Buy for Teenagers
If If you’ve decided that you’re ready to purchase a used car for your teenager, then you’re probably pretty picky about what you’re looking for. Likely affordability, safety, and fuel economy are high on the list. With that said we’ve...