Truck

Tiny
JPLAS3
  • MEMBER
  • 1990 GMC SIERRA
  • V8
  • 4WD
  • AUTOMATIC
My truck will not go when I was driving it all of a sudden itslows down and then just stops then engine is still going so I press on the gas but it still just stays in one spot so I try to switch gears but still nothing then all of a sudden it just shoots forward and it goes for about 3 minutes and then it stops and repeats the process again I seem to figure out what the problem is could you please help.
Tuesday, April 5th, 2011 AT 2:41 PM

8 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
When you give it the gas, does the engine rev? Did you check tranny fluid? Do you think it is a tranny issue or engine?

How long since a tune-up? Any applicable mil codes? Use a gage and check fuel pressure.
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Tuesday, April 5th, 2011 AT 4:01 PM
Tiny
JPLAS3
  • MEMBER
  • 5 POSTS
Yes the engine revs and there is plenty of tranny fluid but what I failed to mention was that I just replaced the flywheel cause it was cracked, I orginaly thought it was the tourqe converter but when I removed the tourqe converter I saw that flywheel was cracked so I replaced it and not more than a week of driving my truck that same sound started again you know the knocking noise and so I took a look down there and sure enough it was the flywheel cracked again. I figured I had a few more drives left in the so I drove it three more times but on te third drive is when the probem acured and then I had to get it twed back home.
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Tuesday, April 5th, 2011 AT 7:44 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Bellhousing and torque converter bolts all torqued correctly? Main bearings ok? The correct flex-plate. Sounds like something not lining up correctly?
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Tuesday, April 5th, 2011 AT 8:03 PM
Tiny
JPLAS3
  • MEMBER
  • 5 POSTS
Ok well I guess back under the truck I go Thank you for your quick responce's and hopefully thats what the problem is. I will give you update on my progress again just want to say thank you.

Anna
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Tuesday, April 5th, 2011 AT 8:47 PM
Tiny
JPLAS3
  • MEMBER
  • 5 POSTS
Thank you very much I guess under the truck I will be going I will let you know of my progress again Thank you.
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Tuesday, April 5th, 2011 AT 8:57 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Let us know what you find.
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Tuesday, April 5th, 2011 AT 9:05 PM
Tiny
JPLAS3
  • MEMBER
  • 5 POSTS
Well I ended up replaceing the engine but I kept the tranny from the old engine and when I when I started it, it started just fine but when I put it into gear nothing happened so I got back under the truck and I noticed that there was a plug hanging from around the tranny now does that plug need to be attached to something could that be my problem as to why the truck will not go into gear
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Wednesday, September 28th, 2011 AT 10:42 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Well, I can't say without looking at it.
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Thursday, September 29th, 2011 AT 2:54 PM

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