Question about 1999 GMC Jimmy
I have changed the crank position sensor, cam sensor, fuel filter, checked the starter, alternator, new battery, ecm, cap and rotor
The security, antitheft or lock picture/icon is a visual indication that something in the car's antitheft system is failing. In most GM cars and trucks there is a hidden system that most people are unaware even exists. From the moment you put your key in the ignition, there begins a constant line of communication between your key's security chip or transponder, to the ignition's lock cylinder, and then to the car's TDM (Theft Deterrent Module). These 3 parts are in CONSTANT communication. If the key is in the ignition, then these parts are sending signals to each other. The security light illuminates when that signal gets broken, even just for a second. When the signal breaks, the car misinterprets this as an attempt at theft and goes into antitheft mode. The car thinks its being stolen or hot wired because it is not getting that signal from YOUR specific key. This is why the security light turns on and shuts down your vehicle. This link explains it pretty well. http://vatspasslockpasskeysecurityhelp.com/
Posted on Feb 03, 2015
Sounds like not enough voltage to run the ECM from your battery, (but enough to crank it over). With a jump, power is going directly to the terminals. Could be as simple as a film of corrosion on the battery post(s). Can test for that by cranking for 10 seconds, then feel both terminals. ANY heat means resistance (poor contact).
Pull both terminals, clean posts and terminals. Apply a bit of lithium or silicone grease and tighten, try a start.
Posted on Feb 02, 2015
Wow, big problem. This may not help because you may have already checked it, but have you checked the ignition coil? If you have, then ignore this. Good luck.
Posted on Nov 17, 2014
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Posted on Jan 02, 2017
SOURCE: 1999 Yukon cold start problems.
1999 Yukon Start Issue - I have replaced the octopuse, battery, fuel filter, fuel pump, still having problems starting in cold weather, sometimes after a heavy rain.
Posted on Dec 08, 2008
SOURCE: 2001 gmc jimmy not starting
Did they do a fuel pressure pressure test to determine that its fuel pump? And if so what was the p.s.i.?It should be around 55 to 60 p.s.i. a few pounds under 55 p.s.i. Pump needs replaced, Your shop should have chk. this when it was there the first time. Did they by chance chg. the fuel filter, that can hinder it from starting too.
Posted on Feb 14, 2009
Testimonial: "it was the fuel pump thank you"
try the oil pressure switch, that was a common problem on Gm trucks when I used to work on them, the oils switch was bad and woulden't allow it to start and the ones I worked on were on the back of the distributor.
Posted on May 29, 2009
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