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Hi Im David, when you said somtimes it continues to turn over with no firing, are you meaning it continues even after leeting go of the key?
Bulletin No.: 03-06-03-001D Date: August 02, 2007 INFORMATION Subject: Starter Cranks After key Is Released (Normal Condition) Models: 2003-2008 Passenger Cars and Trucks (Including Saturn) 2003-2008 HUMMER H2, H3 2005-2008 Saab 9-7X Attention: This bulletin ONLY applies to vehicles with PCM/ECM controlled starters. Supercede: This bulletin is being revised to update the models and model years. Please discard Corporate Bulletin Number 03-06-03-001C (Section 06 - Engine/Propulsion System). Some customers may comment that the engine starter will continue to run after the key is released. For the 2003 through 2008 model years, the Powertrain Control Module (PCM) or Engine Control Module (ECM) controls the starter relay based on input from the key switch. When the ignition switch is held in the start position for 0.4 seconds, the PCM/ECM start timer is activated. Once the start timer is activated, the PCM/ECM will continue to crank the starter until either the engine starts or a no start time limit is reached. Occasionally, the fuel pump module will take one or two seconds to build fuel pressure. Often this will occur after the vehicle sits overnight. During some vehicle starts, the customer may release the ignition switch, keybefore the engine actually starts. When this occurs, the engine will then continue to crank until the engine starts or the no start time limit is reached. This is a normal condition and no repairs should be attempted for this condition.
ok. we can throw the ignition switch theory out, once i found that bulletin.
do you have tilt steering?
here a print
does the vehicle start now?
ok, move the steering wheel up and down to see if you can get a no start condition
intermittent problems are very difficult to troubleshoot as you know. especially when the vehicle is starting.
Models: 2007 -2009 Cadillac Escalade, ESV, EXT2007-2009 Chevrolet Avalanche, Silverado, Suburban, Tahoe2007-2009 GMC Sierra, Yukon, Yukon Denali, Yukon XL, Yukon Denali XL(Equipped with Gasoline Engines)The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.Condition/Concern:Some customer may experience one or all of the following concerns.1) Intermittent No Crank or No Vehicle Power ( The customer may get the impression that the vehicle actually has a dead battery )2) Volt gauge fluctuates, and seems to decrease when a high load accessory is turned on ie.. headlamps, wipers3) IPC backlighting flickers or IPC goes blank4) Diagnostic Code: B1325 set in several modules followed with a Dtc: C0900 set in the EBCM.5) Radio clock resets6) Intermittent Stall7) Hvac temperature actuator defaults to hot8) Door locks cycleRecommendation/Instructions:If you experience one or all of the following concerns and a cause for the concern can't be identified, please check the following items:1) Remove the 175 amp Mega fuse and inspect for arcing, if any type of arcing is found replace the effected components.2) When re-installing the 175 amp Mega fuse, torque fasteners that attach the mega fuse to the positive cables to specification in SI.3) Check the voltage drop reading on the positive and negative battery cables. The voltage drop should be performed with the fuel injectors disabled and while cranking the engine. The voltage drop should not exceed 200 mV. If the voltage drop is above 200 mV, replaced the effected cable.Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
hard starts. a history of running on 1/4 tank or less, low fuel pressure.
have you tested fuel pressure when it acts up?
do you have a fuel pressure tester?
sounds like a fuel pump thats starting to fail ,,basically a fuel pressure gauge is connected to the service port on the fuel rail to check for fuel pressure
the pump comes in the module....but a fuel pressure test would be the way to confirm before taking it apart...but yes it sounds like your on the right path
any further questions feel free to reply
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