Question about 2003 Chevrolet Suburban 1500

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Engine cranks don't start it is firing filters are good i was told it was the airflow sensor

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  • Larry Spears
    Larry Spears Aug 20, 2008

    no fuel to the throttle body injector. Changed fuel filter last week.

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1 Answer

I have had the same issue. Not enough fuel pressure from the pump. Replaced pump and all is good. Just to be sure you can install a gauge to verify pressure

Posted on Aug 23, 2008

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'92 chevy lumina van running rough after fuel pump replacement


mass airflow sensors don't have a vacuum line, you sure you don't mean the EGR valve? if it was the regulator i doubt it would run good or make much of a difference unplugging the vacuum line, take a reading of the fuel pressure, if it starts to drop while the van is running you have a bad regulator.

Sep 30, 2012 | Chevrolet Lumina APV Cars & Trucks

1 Answer

Engine cut out while driving, won't start.


Lets start at the beginning.
If you have a V6 engine you have two cam sensors. And the problem could be the cam sensor(s) is not in sync with the crank sensor due to a problem with the sensor or the timing belt.
Code 340 is for bank one sensor one. You could have as many as 4 sensors depending on which engine you have.
The mass airflow meter code could keep the engine from starting.
The cruise control problem could be related to the cam-crank sensor issue or something else.
You should only have one crank sensor and it is usually near the crank pulley in the front of the engine.

Sep 29, 2012 | 2006 Dodge Stratus

1 Answer

I went to start it and it fired up normally for about 2 seconds then engine cut out. EPC light was on. When i tried to start again it cranks but wont fire up. EPC light goes off during cranking but engine...


  • Hello and thank you for the opportunity to assist you. While the light should be read by a VAC-COM software setup to retrieve the DTC codes I have a good idea what is going on. I am telling you now this is a very estimated guess as nothing is for sure with an undiagnosed light.

  • The first thing you want to check is the ECM relay that is in the relay panel under your hood in the junction box. It's location should be indicated on the underside of said junction box lid. I don't suspect this but check it anyway.


  • What almost always is the problem is what is called and engine speed sensor also known as a Crankshaft Position Sensor. Really really simple to fix. Do yourself a favor and get an OEM sensor from VW. You will be glad you did.

  • You will need some oil first because you will need to pull the oil filter to access this sensor. So drain all the oil and remove the oil filter. Then wait 10 minutes or so for the oil to completely drain. The sensor is right below your oil filter. Remove the connector and the mounting bolt and wiggle the old sensor out. Make sure to use a new O Ring and just press the new sensor in. Tighten the mounting bolt just nice and snug. Not to tight though. Replace the connector. Finish up on the oil.


  • This is almost always the fix. Should it not for some reason, and it may not, then you will need a scan from a shop or a dealership. I am confident in giving you this information as a fix though or I would just suggest you get the code first.


  • Hope this helps and please do feel free to post any followup questions or any comments you may have. Also if this information is helpful please do leave a comment so other know I offer good service. Thanks again.

  • Your part number is 078 906 433 A

Regards,Tony

Oct 26, 2011 | 2002 Volkswagen Passat

1 Answer

Engine cranks but will not start. i have new fuel filter installed new plugs installed .i have fuel pressure at fuel rail ,i have spark at plugs and the injectors all read 11 to 14 ohms resistance per shop...


If you've got spark and fuel, it should fire up. Crank the engine for about 20 to 30 seconds then immediately pull one spark plug. if your getting fuel, it should be wet with gasoline. No wet,no gas. But then again, the code says rich mixture. Doesn't add up. Check all the connections at the mass airflow sensor and the crankshaft and camshaft sensors.

Dec 20, 2010 | 2003 Pontiac Sunfire

1 Answer

My 2000 Ford Ranger keeps showing codes PO 171 and


These codes mean that the oxygen sensor is reading too "Lean" on both the left and right cylinder banks and the engine control system can't compensate any further to solve the problem. You may have a dirty or failing Mass Airflow Sensor that is miscalcuating the amount of airflow the engine is taking in which in turn can cause both of these codes to set. If the sensor is reporting less air than the engine is actually taking in then the engine computer will add only the amount of fuel it should based on what it was told by the sensor which will cause both cylinder banks to run "lean". There could be something else going on such as having two bad oxygen sensors [very rare] but I do see these two codes together quite often and usually its the sensor that is causing it. Hope this helps a bit!

Jul 11, 2010 | 2000 Ford Ranger SuperCab

1 Answer

Engine turning over and firing but wont start. timing chain looks good, has new crank sensor, o2 sensors, and cat.


check wiring, fuses and relay for fuel pump and check fuel filter---also recheck to crank sensor wiring ,connections and sensor new doesnt mean not defective

Feb 10, 2010 | Chevrolet Blazer Cars & Trucks

1 Answer

Expedition won't start or even act like it wants to. Just cranks and cranks. I feel it might be fuel pump.


easy way to test for it being fuel.open air filter box spray alittle starter fluid.then try starting if it runs or fires over its fuel related.if not then its sensor or fuse related.hope that helps.make sure the fluid is ma safe.meaning mass airflow sensor safe.as some starter fluids will mess them up.

Nov 27, 2009 | 2000 Ford Expedition

2 Answers

FIRING ORDER & CAR QUITS WHEN YOU PLUG IN MASSIVE AIR FLOW SENSOR


Hello,

You really need to start with basic troubleshooting. Is there spark to the spark plugs? Do you hear the fuel pump prime during initial Key On & during Engine Cranking?

Why did you change the MAF (mass airflow sensor)?

Jun 29, 2008 | 1993 Buick Century

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