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00 Sierra Hard Start and Back Wheel Prob

Sparxxx75

By Sparxxx75
in Ask A GM Technician

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Sparxxx75 New Member

Sparxxx75

Posted
Posted

2000 Sierra Ext Cab, 5.3l, 2x4, 3 door. 1500

 

I recently bought my truck used and it came with a warranty of 6 months within 2 months of ownership the truck developed 2 problems.

 

1st: Almost everyday when I back out my driveway I will feel a wheel hop coming from the driver's side rear wheel. It seems to go away real soon but I also notice sometimes during city driving the back wheel will squeal when making a left turn.

 

2nd: Start up in the mornings are normal (perfect) but once I drive somewhere and shut off the truck for at least 5-10 minutes it becomes so hard to start. I have to let it crank for awhile and once it starts there is a good chance it will stall but eventually I can get it started. If I shut off the truck and start it back up right away most of the times it starts with no problems. It happens only when I let it sit 5-10 minutes.

 

Now the shop I have to take it to for the warranty said that it needs a tuneup and it's not covered by the warranty. So $120 later I gave it a proper tuneup. Replaced plugs with the recommended AC Delco plugs, replaced the wires, and the PCV Valve.

 

The tuneup did nothing, same exact problems. The shop where it's at said they can't do anything for me since they can't figure it out. They also said fuel pressure is normal.

 

So this shop will not fix the rear tire because they can't get it to do what i'm saying and refuses to fix the problem with the starting because they can't figure it out...I'm so furious right now because I believed in the warranty.

Easytide Enthusiast

Easytide

Posted
Posted

I,d wanna know what the fuel press. when it,s cranking and not starting. Hot soak issues can vary from ecm issuess to simple fuel filter problems. Try to find the basics when it wont start...fuel/spark. As far as the rear wheels i had a similar prob with my 2000. I bought it used and at the time had cheapo helper add a leaf springs. I removed those and wheel hop (spring wrap as it turned out) was better for a short time and quickly returned. A much closer insp showed a cracked main leaf. After a set a boneyard springs I had no more issues .

GMC Tech Enthusiast

GMC Tech

Posted
Posted

Several hard start hot issues on that engine have been traced to a leaking fuel pressure regulator. It leaks fuel from the rail to the vacuum line connected to the manifold. When it happens pull the small vacuum line off the intake manifold and turn on the key. Should see fuel drip out.

markw8 Enthusiast

markw8

Posted
Posted

Several hard start hot issues on that engine have been traced to a leaking fuel pressure regulator. It leaks fuel from the rail to the vacuum line connected to the manifold. When it happens pull the small vacuum line off the intake manifold and turn on the key. Should see fuel drip out.

 

 

What he said. Also maybe find a more compitant shop.

 

Mark

Sparxxx75 New Member

Sparxxx75

Posted
  • Author
Posted

I wish it was as easy as that. Since it's under the dealers warranty I have no choice but to bring it to that shop.

 

Now last night I went to get the truck back from the shop and they told me they cannot figure out the starting problem and they told me most likely the throttle body has to get cleaned (they showed me some bulletin from GM). But that is not covered under the warranty. I read these forums for hours last night and found the most common problem to be the Fuel Pressure Regulator, just as the post above stated. I told them about FPR and they told me that it was checked when they pressure tested it...

 

So as I pulled in the shop I saw the mechanic doing doughnuts trying to get the rear end to hop or squeal...nothing. He did tell me the differential fluid was dirty and that he replaced it with synthetic fluid.

 

After getting my keys back and the long cranking later I leave the parking lot only to find my brake peddle goes all the way to the floor. I pumped the brakes a few times and pressure came back until I get 1 mile down the road and the peddle goes all the way to the floor again. I took it back and they told me I busted a brake line. After a few heated words they told me they will replace them free of charge.

 

So now I set up an inspection with the GM dealer here in town for $75 (next Wednesday) and have them tell the other shop what to fix. How messed up is that?

Sparxxx75 New Member

Sparxxx75

Posted
  • Author
Posted

I,d wanna know what the fuel press. when it,s cranking and not starting. Hot soak issues can vary from ecm issuess to simple fuel filter problems. Try to find the basics when it wont start...fuel/spark. As far as the rear wheels i had a similar prob with my 2000. I bought it used and at the time had cheapo helper add a leaf springs. I removed those and wheel hop (spring wrap as it turned out) was better for a short time and quickly returned. A much closer insp showed a cracked main leaf. After a set a boneyard springs I had no more issues .

 

 

I can see the hop from bad leaf springs but that wouldn't cause the wheel to squeal, would it? Only left hand turns (doesn't happen all the time) will cause it.

Easytide Enthusiast

Easytide

Posted
Posted

Assuming tire press is correct and tires arent mismatched (hadda ask,,sorry)..then something in the suspension is certainly not equal. is the rear ride height correct? steering wheel dead centered? Assuming the thing hasnt been wrecked or spring locator pins arent sheared,,,i,d still question the right spring pack..or even a totally blown shock,,,,you need to get someone to put this in the air and have a real close look at things

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