2000 GMC Yukon Replaced torque converter, tranny rebuilt, n

Tiny
ERICE
  • MEMBER
  • 2000 GMC YUKON
  • V8
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
Installed a rebuilt torque converter, rear main seal, also had the forward clutches in my transmission replaced by a good trans shop.

Everything went back together smooth. Now truck doesn't start. Turns over fine, but will not start. Never had problems with starting before. Check engine light also on, was not on prior to removal of trans.

Any help appreciated. Is it possible that a wire got nicked, not allowing the engine to start?

Update, found an individual with similar problem. Answer there was to replace the park/neutral safety switch. I could not get the two connectors on this switch to fully "click" into place. Is this a problem?
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Sunday, November 2nd, 2008 AT 10:11 PM

6 Replies

Tiny
ERICE
  • MEMBER
To: rasmataz

I sure don't mind paying for info. It invaluable. But could you please respond to my question, not a generic answer. Thank you.
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Monday, November 3rd, 2008 AT 12:15 PM
Tiny
RASMATAZ
  • MEMBER
Lets restart

Now truck doesn't start. Turns over fine, but will not start. Never had problems with starting before. Check engine light also on, was not on prior to removal of trans.

When you say doesn't start do you meant it cranks over and refuses to start or just won't crank over at all-I need to know this to continue

park/neutral safety switch. If there's a problem with the NSS the engine w/n crank

Now truck doesn't start. Turns over fine, but will not start-I gave you an answer earlier to determine if its fuel or spark-this is not an easy fix can be a nightmare. I did that so you can give me a direction to start

Installed a rebuilt torque converter, rear main seal, also had the forward clutches in my transmission replaced by a good trans shop.-Replacing these items will not cause a No start problem.

Once again I need to know, does it crank over and refuses to start or won't crank at all/nothing before we can continue-give me something to work with.
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Monday, November 3rd, 2008 AT 4:07 PM
Tiny
ERICE
  • MEMBER
To rasmataz:

Cranks over and refuses to start. Never had a problem prior to pulling trans.
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Monday, November 3rd, 2008 AT 4:30 PM
Tiny
RASMATAZ
  • MEMBER
Do you hear the fuel pump for 2secs when key is at run position-if so check fuel pressure and report back the readings-if not check fuel pump fuse and fuel pump relay.

If fuel pressure is okay-Disconnect a sparkplug wire or 2 ground it to the engine and have helper crank engine over-do you have spark?
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Monday, November 3rd, 2008 AT 4:47 PM
Tiny
ERICE
  • MEMBER
Do hear the fuel pump turn on for a couple secoonds when switch turned on.

Sprayed some starter fluid into throttle body. Upon cranking, the engine immediately started for 1/2sec, but did fire. Then checked fuel pressure: when switch first turned to on (and about 2secs of fuel pump running) the pressure was 57-58. As soon as fuel pump shut off, the reading dropped to 50-51. Did not check spark yet. Seems to be fuel deprived since engine fired with starter fluid.
Did not purchase OBDII tester yet, hoping this info will help. Testers are not rentable in california any longer.
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Tuesday, November 4th, 2008 AT 10:15 PM
Tiny
RASMATAZ
  • MEMBER
If its a 305 or 350 engine the fuel pressure should be 60-66psi

Also check for injection pulses -use a noid light on the injector/s harness connector-, No pulses no fuel being deliver
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Wednesday, November 5th, 2008 AT 1:48 PM

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