Skip the auto shop - Our mechanics make house calls

Q: Jeep won't start.

asked by on

I went to start my jeep and it just was cranking but wouldn't turn over. I tried it again a little later and it started right away. Turned it off and tried to start again and nothing.If I pump the gas pedal it will start but is running very rough and as soon as I let off the gas it kills. I thought maybe it's the fuel pump but I can hear it come on and when I have someone try and start it and I push it the port on the fuel rail gas is coming out in a steady steam. And there is no check engine light on. What could it be?

My car has 155000 miles.
My car has a manual transmission.

Hello, thank you for writing in. The vehicle sounds like it is getting fuel pressure while starting or holding it while the vehicle is off. This does not necessarily mean that the fuel pump is sustaining pressure after the vehicle is started. The best test is using an in-line gauge while cranking and starting. With that being said, if the fuel system (including the injectors) test to be okay, you will want to look into the air intake system. This includes the mass airflow sensors and the air filter/ducts. Double check the battery and alternator have clean, dry, and tight connections (including grounds). Make sure the throttle body is clean, and has good electrical connections. You may then need to look into the spark plugs and wires from there. For more diagnostic help, contact our service department.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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

Q: Engine overheating even though coolant fan was running

This can be caused by a number of things such as low coolant levels, a faulty thermostat, or a failing coolant fan switch. As you may know the coolant fan switch helps to maintain the proper coolant temperature by turning...

Q: spark plug arcing at boot

Spark wires and boots do age, get damaged and otherwise fail. An accompanying symptom can be the arcing your describe, or voltage leakages, which simply means that the energy that was supposed to go toward firing the plug gets diverted....

Q: My vehicle is hard to start.

You can try checking fuel pressure. The fuel pump has a check valve that will not allow pressure to bleed back into the assembly as it pumps. If a fuel pressure gauge is hooked up, the fuel pump will activate...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.