Question about 1999 GMC Savana
Misfire cyl. 5&7; compression, leak down, spark ok. fuel pressure drops to 0 after 2 sec.
Fuel Pump may be bad & not hold pressure
Look up how to test a pressure regulator
The misfire on 5 & 7 could be a different issue,
smoke test the intake for vacuum leaks
Leak down & such maybe good but you still can
have mechanical issues in valve train or electronic
Posted on Jul 26, 2013
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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
had this problem on my neighbors 98 chevy truck with the same engine !!
it turnd out too be the fuel pressure regulator,you have too pull the upper intake too replace it!!
Posted on Jun 06, 2009
SOURCE: 1997 gmc savana 4.3,
only 3 things will cause this engine not to start (crank and not start) fuel, ignition, timing.
You haven't mentioned the engine cranks over or not, so I have to assume it cranks over.
Possible timing chain or the crank sensor on the timing chain. Have you checked this? you need to remove number 1 spark plug & when the piston is in the full top position on compression, remove the dist cap & see what spark plug wire the rotor is pointing to inside the dist cap. (I'm sure if you google checking for top dead center you'll find the proper procedure)
Posted on Oct 13, 2009
I would check the valves for number 6. If one or both are burned, stuck or out of adjustment it would cause your problem. If a cam lobe for that cylinder is burned or badly worn it could be the culprit.
Posted on Jan 10, 2010
Smell of the oil,to see if the fuel injector(spider)is leaking into the crank case,if so,the intake will have to be removed to repair the problem,oh,and change the oil.
Posted on Jul 11, 2010
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