Q: 1997 ford f350 7.5 l engine cranks but no start.Has spark,good compression,fuel,tried start fluid,removed oxy sensor.Any other ide

asked by on October 23, 2017

Engine cranks but no start.Compression is 125 all cylinders.Spark is good at new spark plugs.Sprayed start fluid in carbs.Good fuel pressure.Removed oxy sensor.Engine gives an occasional little kick after cranking.But will not start.Ran fine before i parked it a week ago.I am out of ideas.Can you help?

My car has 128000 miles.
My car has an automatic transmission.

Hi Dan. Thanks for contacting us today. I’m kind of curious as to why you’d remove the O2 sensors - as they are vital for relaying data to the ECU in order to create the right air to fuel mixture. This might be the source of your starting problem. However, it’s also possible that a crankshaft or cam sensor is damaged, or the electrical harness connected to them is frayed or damaged. The first thing I’d do is verify your ignition timing is correct and that those ignition sensors are working well. Second, I’d install the O2 sensors again and secure the electrical harness. Once that is done, clear any existing error codes in the ECU. If this resolves our problem, fantastic! If not, you might want to have a professional mechanic come to your location and help you diagnose this problem.

Was this answer helpful?
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

Get a quote

What others are asking

Car stalling when put into gear.

It sounds to me like the engine might have drivability problems and the load from the transmission is overcoming the engine power at idle. Have a certified mechanic who is familiar with older carbureted engines inspect the timing and check...

Skipping, light rough idle, & smoking

Hi and thanks for contacting YourMechanic. Depending on what color the smoke is will determine what is happening with the engine. If there is heavy black smoke, then there is too much fuel in the cylinders and the fuel is...

Car doesn't always start.

Hi there! Your I am not able to give you a definitive answer without inspecting the car. However, a malfunctioning anti-theft system is sure to cause a no-start condition. In this instance, the key is turned and the dashboard lighting...

Related articles

The Best Used Cars to Buy If You're a Fisherman
What What do anglers look for, specifically, in their vehicles? Lots of room, plenty of cargo space, and sometimes, the ability to handle rough terrain. Some fishermen also want the option of towing a boat. With that in mind, we...
The Best Used Cars to Buy If You're a Dog Breeder or Trainer
These These days, dogs are more and more likely to travel with people than ever before. After all, what dog doesn’t ride in a car? As a breeder and trainer though, you’re probably more likely to carry along dogs than...
How to Use the Ford Active Park Assist Feature
There There are few driving maneuvers as universally disliked as the parallel park. Most people still remember that terrifying sequence of movements in their driving test. Even people who live in metropolitan areas, people who must regularly parallel park, usually...