1999 Chevy Tahoe

BOBDOC64

MEMBER
1999 CHEVROLET TAHOE

Electrical problem
1999 Chevy Tahoe V8 Four Wheel Drive Automatic

Why wont my 99 chevy tahoe start?
It has good spark and good fuel pressure kicks back threw the intake. Does start occasionaly. Only after sitting about two to three days does it have this problem.

Additional Details
Battery is new coil is new It has good spark and good fuel pressure kicks back threw the intake. Does start occasionaly. Only after sitting about two to three days does it have this problem.

7 Replies

JACOBANDNICKOLAS

MECHANIC
109,772 POSTS

Are you getting power to the fuel injectors? Have you checked timing and engine compression? Finally, was the check engine light on? This could be something as simple as a crank sensor.

Let me know.

Joe

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Sunday, January 24th, 2010 AT 12:55 AM

BOBDOC64

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Compression, fuel, spark is good, timing is good. Problem happens if truck sits for two days or more. Then you could go out next day and truck would start as if no prblem. When it does not start it cranks, and almost locksup, you would swear it is a ign. Problem. How about a crank sensor.

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Sunday, January 24th, 2010 AT 5:00 PM

JACOBANDNICKOLAS

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109,772 POSTS

It could be a crank sensor, but I would think that would have set the check engine light. WHen it doesn't start, are you sure you're getting spark? If you are, then the crank sensor is fine. Also, I will assume you checked the injectors with a noid light or = to make sure they are firing too.

Let me know.

Joe

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Monday, January 25th, 2010 AT 7:40 AM

BOBDOC64

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Thanks for all your help wish everybody would go back to basics on diagnosis.I replaced distributor cap and router a year ago, crabcap. What I found was, brass terminals on cap turned green indicating water got in and was wet when I removed it new cap and rotor pricey as they are solved the problem. Also when checking crank sensor did not ohm check good from terminal a to c. Old sensor 20.00 compared to 5.00 for new. Replaced it before I put cap and rotor on swore it was gonna solve my problem. Cap and rotor was the problem!

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Saturday, January 30th, 2010 AT 2:25 PM

JACOBANDNICKOLAS

MECHANIC
109,772 POSTS

I'm glad you found the problem. It's funny. WHat you said couldn't be more accurate. Cars have become so involved that is causes people who deal with them every day to forget the basics. I'm sorry about that. I just delt with one that a person had over 1000 dollars in it with sensors, solenoids. And couldn't get rid of a miss. I told him to start the car and spray water on the plug wires since the problem was worse when it was wet out. That is a perfect example of back to basics. It cost him a 15.00 set of plug wires after he saw them light up when wet. He was happy to find the problem, but mad about how simple the problem was. Your advice is good. I miss the good old days.

Take care, thanks for using 2carpros. Com, and thanks for the usefull advice.

Joe