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1997 Chevy Tahoe Ignition Problems

Tiny
EIGHTBALL1011
  • MEMBER
  • 1997 CHEVROLET TAHOE
  • V8
  • 4WD
  • AUTOMATIC
  • 130,000 MILES
Engine will turn over, but will not start. Fuel Pump is working. Get great fuel spray when depressing fuel release valve on fuel rail. Checked and replaced the ignition module, distributor camp and button. Not getting fire to spark plugs. Plugs are not fouled out or have deposits. Gap is fine. Curious about coil pack or timing chain, however nothing leads me to believe timing chain damage. Please help!
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Monday, November 9th, 2009 AT 6:24 AM

7 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Welcome to the forum, use a noid lite and check for injector pulse. No injector pulse and no spark at the plugs, look for an rpm signal.

You can check for primary voltage at the coil, pink wire, see if it is hot. The white wires at the coil should have a pulse with engine cranking.
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Monday, November 9th, 2009 AT 9:35 AM
Tiny
EIGHTBALL1011
  • MEMBER
  • 3 POSTS
Ok. Checked what you asked about. The injector has no pulse. There also is no RPM movement. The crank shaft sensor did have a broken connection, however after fixing it the truck still did not crank. Checked the wires on the coil. Pink - Hot White - Hot Ground - Hot. There also was no intermitten fire while cranking. Does this sound like a bad coil? Thanks for help.
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Wednesday, November 11th, 2009 AT 6:27 AM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS


http://www.2carpros.com/forum/automotive_pictures/170934_97_chevy_tahoe_2_1.jpg



No. I don't think it is the coil. The coil driver module has to receive a signal from the pcm. If the pcm isn't receiving the rpm signal, it can't do anything.

Three wire connector at crank sensor, ref voltage-- ground-- signal?
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Wednesday, November 11th, 2009 AT 8:44 AM
Tiny
EIGHTBALL1011
  • MEMBER
  • 3 POSTS
Alright. Replaced crank angle sensor and also the module inside the distributor. Still no luck. No fire to plugs. Checked the wires coming to/from the crank sensor, no fire. All three wires are cold. Any other suggestions? Thaks for help.
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Monday, November 16th, 2009 AT 7:07 AM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Key on engine off, do you have voltage, pink wire at injector? No, check ecm 1 mini fuse 20 amp, underhood fuse box, not only check fuse, use testlite and check that fuse circuit is hot, it goes hot when you turn on the key. That same fuse circuit supplies voltage to crank sensor.
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Monday, November 16th, 2009 AT 8:34 AM
Tiny
EIGHTBALL1011
  • MEMBER
  • 3 POSTS
Okie dokie. With ignition on truck off, have power to the coil, however all three wires (pink, white, black stipped) are hot. There is no power to the crank sensor, however.

Ok, so if I check the mini fuse and its hot with key on, then theoretically Ishould be getting fire to the crank sensor. The fuses themselves were fine, but I will check the circuit itself. Thanks man. Will let you know.
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Monday, November 16th, 2009 AT 1:02 PM
Tiny
WILLIAM LABRECQUE
  • MEMBER
  • 5 POSTS
I had the same problem. I changed the module and ran through the tests 3 times over the next 2 weeks. Turned out to be the module Kragens sold me was bad
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Thursday, December 10th, 2009 AT 8:23 PM

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