Skip the auto shop - Our mechanics make house calls

Q: Jeep will turn over and try to start but shoots back pressure out of the intake

asked by on

My jeep prior to replacing the crank shaft sensor. Now it will turn over and get very close to starting but doesn't, and is pushing back pressure out of the intake. The timing chain has been replaced, I can't figure out what's wrong.

My car has 130000 miles.
My car has an automatic transmission.

A: Hi there. If it is shooting pressure back t...

Hi there. If it is shooting pressure back through the intake then either the valve timing is off or the crank sensor is not reading correctly. I would typically start by checking the compression. If the compression is off on all cylinders then the cam timing is incorrect. If it is low on only one or two cylinders then you may have a bad valve seat on those cylinders. If the compression is fine then the ignition timing appears to be off. This can be caused by a defective crank sensor, a wiring issue or a computer problem. I would also make sure that all of the ignition coils are installed correctly with the correct routing. From my experience with this vehicle it sounds like a valve seat problem. If you want to have this no start checked out, consider YourMechanic, as a certified mechanic can come to your home or office to [diagnose why it is sending pressure through the intake] https://www.yourmechanic.com/services/car-is-not-starting-inspection

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

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: Heater core or thermostat

If the engine temperature, as measured on the dash gauge, does not reaching the normal operating range within "roughly" 5 miles or so of driving, then a possibility is the cooling system thermostat is stuck open. Among other things, a...

Q: harmonic balancer replacement

Hi there. Quotes cannot be generated via the ask a mechanic portal. Your request is being forwarded to customer service. Please have your vehicle make, model, year, mileage, and VIN readily available. Your Mechanic has several available technicians that can...

Q: Car air conditioning blows cool but not cold air

Air conditioning is a complex and delicate system. The only way to properly diagnose a system is with a lot of specialized equipment. There are too many variables to guess. A short list for a under-performing system are: a weak...

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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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.