1995 GMC Jimmy Jimmy Hard To Start

Tiny
CFERRY1
  • MEMBER
  • 1995 GMC JIMMY
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 220,000 MILES
Presently, I am having Starting Difficulties in my 1995 GMC Jimmy. Without a Battery Jump it will sometimes start after 5 cranks. IF I jump it itwill start Firtst Time everytime.
The items which I have very recently replaced are the Battery, Starter, Coil, Dist. Cap.
The timing I have noticed is very slightly advanced according to the timing light.
One item that seems strange is that at the Coil supply wire I have 11.3 volts when turning the key to the on position. Is this correct - I thought it should have the full battery 12 volts at the coil.
Any other suggestions would be helpfull.
Thank You
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Monday, April 27th, 2009 AT 10:15 AM

4 Replies

Tiny
BLUELIGHTNIN6
  • EXPERT
Hello
Thanks for the donation

You stated that you replaced the battery but how about the cables? Inspect and, if necessary, replace the battery cables. Ensure they are clean and tightened properly at all connections.

Let me know and I will follow up.

Thanks for using 2CarPros. Com!
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Monday, April 27th, 2009 AT 6:12 PM
Tiny
CFERRY1
  • MEMBER
Dear Bluelightnin6,

I want to place emphasis on the fact that Jumping it really does Start Engine first time everytime.
I have checked and volt-ohm metered the major Battery cables. All does appear fine with the cables.

Question : What is jumping the battery providing?
1. Higher battery voltage ( maybe 12.75 v to 14.0 v
difference)
2. Higher available Battery Current

A. In providing a higher voltage - this could be kicking an Engine element, Sensor, etc. Just over the approximate 12 volt threshold that iit needs to Start the Engine. (This could indicate that somewhere their is a component with a poor Ground or 12 volt wire connection? )
B. In providing Higher Current available - this could be kicking the components related to the Spark Plug Spark just over the threshold to start?
C. In providing Higher Current - this could be Spinning the Starter Faster, therefore the Engine spins faster on the Start Up, indicating that Engine Ignition Timing maybe critical? IF with the normal non-jump battery Current (I=E/R) available, the engine is spinning normal speed ( or slower ) on startup, therefore not nearly reaching the slight advanced Timing.
I think the Timing is set so slightly advanced that a couple degrees of timing is not going to make a difference. I need reassurance on these items.
Please feel free to comment on these items.

Looking forward to your suggestions.
Thank you
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Tuesday, April 28th, 2009 AT 12:35 PM
Tiny
BLUELIGHTNIN6
  • EXPERT
If the battery is good and the entire charging system is good then I do agree with you, there must be wiring to a component or a component itself that is not receiving proper volts with just the normal cranking battery. What happens if you jumper the starter with a screwdriver (bypassing the ign. Switch)? Perhaps the switch has faulty wiring to it or not enough ground? I don't believe timing would be the culprit here, even if it were off slightly like you said it really wouldn't stop it from starting, perhaps just give it a bad idle.
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Tuesday, April 28th, 2009 AT 1:36 PM
Tiny
CFERRY1
  • MEMBER
Bluelightnin6,

I appreciate your suggestions - helping along this path.
This has been a very difficult one for me.
I have not driven this car much siince we last commented here.
I purchased one of those cigarette lighter / power socket accessories voltage monitors. This way I can always have a exact in digital readout of the battery,
convenient in the cockpit.
When I turn the Key to ON position or accessory position the voltage at the cigarette lighter DROPS 1.5 - 2.0 Volts. I do not like this.
By pulling the Guage Fuse this lessens the voltage drop. By pulling only the ENG1 Fuse this really lessens the drop.
I want to know why ENG1 is pulling Much current.
I'm still pondering this one?
In the meantime I have been pulling ENG1 components off the circuit one at a time and plugging them back in. Still can't find this?

As of yesterday 5/25/09 - I installed a used Alternator from a 1994 GMC Jimmy or Blazer, can't remember or it wasn't that critical. It look like my Alternator !
WAYLA WAYLA - IT Started like one to two Times of Crank !
I Happier Now !
The voltage Drop is Less now when I turn key to On position - by about 1 volt !
I think this is related to the Voltage Regulator.
I had just installed a "new" Alternator (the least expensive) from Advanced Auto on 11/14/08.
My Starting problems started on 4/02/09.
Now, I want to rechange or purchase a new battery.
This morning 5/25/09 It took 5 times to Start.
A little of this is the EGR Valve I believe which I have the electrical connect temporary removed. Some maybe that I have change only 1/2 of the Spark Plugs to a hotter plug which I think you suggested.
I installed Z-Max Fuel and Oil Additives.
Yes, I agree this Engine is getting near Lifetime Age.
However, I would like to drive this car some or on a regular basis.
Please send a reply when convenient. I appreciate your help.
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Tuesday, May 26th, 2009 AT 10:51 AM

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