Skip the auto shop - Our mechanics make house calls

Q: Got 40 lbs fuel pressure got spark no injector e

asked by on

Cranks wont start got 40 lbs fuel pressure got spark but no injector pulse

My car has 140000 miles.
My car has an automatic transmission.

A: If you have spark and fuel pressure but no ...

If you have spark and fuel pressure but no injector pulse, it is most likely the crank sensor, the crank sensor connector or another wiring problem in the crank sensor circuit. The best method to check the crank sensor is with a scanner. You will find a crank sensor signal in the data list. There will be a cranks sensor PID or you an simply look at the RPM (revolutions per minute) PID. If it shows RPM’s, the crank sensor is working. If you can’t confirm a crank sensor pulse, you will need to disconnect the crank sensor connector and check the resistance of the cranks sensor with a multimeter. The resistance should be 800-1200 ohms. If you don’t have a crank sensor pulse at the scanner and the crank sensor is within the specified resistance specifications, there will most likely be a bad connection somewhere in the crank sensor wiring harness.

Testing the wiring harness is done by checking for continuity from the PCM (powertrain control module) to the crank sensor connector. If all this tests good, you may have a failed PCM. Looking at the wiring diagram for your Aurora, there are two crank sensors on your motor. They are located on the block toward the front of the car, the left side of the motor between cylinders 4 & 6. There will either be two separate sensors or the two sensors will be integrated together with four wires.

Also, the fuel pressure specification for you car is 46-59 PSI. So 40 PSI is a little bit low. I would make sure you have an accurate gauge and cycle the key a few times to be sure fuel pressure has built up sufficiently.

If you should require further assistance with this, I recommend the following inspection to help you out; Car is not starting inspection which is performed by a certified technician from YourMechanic at your home or place of business.

Good luck!

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: Engine won't crank to start.

Even if the shift interlock solenoid is faulty, as long as the gearshift is in the Park position, you should still be able to start the car. Once the engine is running, you just won't be able to shift into...

Q: iPhone not charging from car receptacle

Hi. You should have your lighter port changed to a 12 volt charging port. The older ports were only meant to be used as cigar lighters and are not capable of getting a good connection for chargers. They sell these...

Q: I have to run the AC to prevent stalling.

The only thing to say here is to suggest you get the fuel leak fixed before you do anything. No other problems can be looked at till the fuel leak is identified and fixed. I would recommend having a mechanic,...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...