SOURCE: Extended starting time
Sounds like an ignition problem..
The Direct Ignition module in the turbo model can fail but is
easily
tested and replaced.
Remove turn the , Direct Ignition module put the spark plugs in the holes, ground each
plug to the negative battery terminal by use of a wire about 2 feet
long and stripped at each plug. Crank over the engine
over watching the spark plugs. If there is a problem with the cassette, one
of the plugs will have no spark or a very weak spark. Also, when you
turn the ignition key off there should be a shower of sparks that runs all of the plugs simultaneously several times.
DANGER BE CAREFUL ! ! ! EXTREMELY HIGH
VOLTAGE! There have been occasions when the Direct Ignition module would test ok
when turned upside down but would fail when turned back over to install
into the valve cover ?
Also: Oil leakage from the individual coils of the Direct Ignition module have also been a problem. Oil leaks can be identified by
noting that there is oil surrounding spark plug hole.
Hope this helps.
Cheers MMP
SOURCE: 2000 GMC Jimmy will not start
The oil presure switch does have some bearing on the problem but my suggestion is to change the coil. I had a the same problem with an astro van. I changed everything that you have described and it fixed the problem just for a little while and then all of a sudden did it again. I changed the coild and the cold start swithch and never had the problem again.
SOURCE: 2000 gmc jimmy wont start fuel pump comes on and cuts off...
When you hook the pressure test guage to shrader valve on fuel rail what it reads is what the pressure is from pump, around 60 p.s.i. all you need to do is hook up the guage and turn on key, you do not have to turn engine over, and if pump is good it will shoot up to 58 or 60 right now.
SOURCE: 1998 Chevy tahoe Hard to start when cold
replace your MAP sensor(manifold absolute pressure) the map sensor is the computer for your fuel pressure regulator telling how much pressure. Unless your tahoe runs like **** going up hill than it inevitably your fuel pump
SOURCE: how to change a 2005 nissan sentra fuel pressure regulator
If you want to replace the fuel pump regulator you are better off getting the whole fuel pump module I know its expensive.The problem is you went on line and there is a bunch of chatter about the fuel pump causing delayed starts. They are right. There is a TSB Nissan put out this includes the fuel pump and there is no mention of the regulator that I know of.
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