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06 Gmc Sierra, Won't Start, Please Help

sdmp

By sdmp
in Ask A GM Technician

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sdmp Enthusiast

sdmp

Posted
Posted

2006 GMC Sierra, 5 speed manual trans, 99,000 miles.

Bought new, meticulously maintained, daily driven, no major issues this far, until now. No codes.

 

3 weeks ago, truck stalled out driving home. Would turn over, but not start. Had it hauled home.

Ignition module tested bad (low rpms), replaced. Still no start.

Replaced coil. Still no start.

Flooded due to cranking over so much, allowed it to sit, replaced wires, plugs, cap. still no start.

Hauled in to mechanic. Mechanic replaced cam and crank sensors, checked fuel pressure, compression. all fine.

mechanic checked computer, getting feedback. No codes on readers, could be due to battery disconnect during repairs above, not sure.

Thought maybe bad igntion switch, yes tested bad. So replaced. Still no start. All relays and fuses have been checked.

We are all at a loss. Everything looks good, distributor has hot fire, but it is weak at the plugs. Any ideas. This is becoming a money pit. This truck is not paid for, out of warranty. Help please :thumbs:

markw8 Enthusiast

markw8

Posted
Posted

All I can say is find a more competant mechanic. He has missed something or doesn't understand what he's seeing.

 

Mark

minibike132 Senior Enthusiast

minibike132

Posted
Posted
All I can say is find a more competant mechanic. He has missed something or doesn't understand what he's seeing.

 

Mark

 

I hate to jump to this conclusion cause we have all been stumped by something, no on is perfect but it does sound like he doesn't quite have a handle on this.

 

First of all your post lacks what motor is in the truck, second I don't see a fuel pressure at key on and cranking.

sdmp Enthusiast

sdmp

Posted
  • Author
Posted

Sorry, I forgot. So frustrated. It is the 4.3L V6. 58 is the pressure on the trunk on cranking. The truck is going to another mechanic on Monday. This guy is a certified mechanic, he is usually right on anything you take him. Also, a service tech from the dealership came and looked at it for him because he was stumped and quite irritated that he could not figure it out either.

 

 

 

All I can say is find a more competant mechanic. He has missed something or doesn't understand what he's seeing.

 

Mark

 

I hate to jump to this conclusion cause we have all been stumped by something, no on is perfect but it does sound like he doesn't quite have a handle on this.

 

First of all your post lacks what motor is in the truck, second I don't see a fuel pressure at key on and cranking.

 

 

 

 

sdmp Enthusiast

sdmp

Posted
  • Author
Posted

I also meant to say thank you for your help. Come from a long line of mechanics myself, and this one I guess is over my head.

minibike132 Senior Enthusiast

minibike132

Posted
Posted

Did anyone check the base timing? The distributor gear in this motor has an issue with getting loose and losing base timing. There are two marks on the crank pulley that must be lined up then check distributor timing. Fuel pressure looks good, has anyone checked fuel quality and volume?

 

 

 

 

The first thing I would do is check base distributor timing. If good pull the plugs back out, if wet replace or clean them real good then try starting with ether directly into the throttle body NOT pre mass air flow. If it starts then you are on track and you know it's fuel.

 

EDITED: to remove all the s&*t you don't understand or don't care about.

sdmp Enthusiast

sdmp

Posted
  • Author
Posted

Ether would not start it, but that may not mean that the fuel is not the problem. We started running ethanol free about 2 months ago maybe. We run a landscaping business, and the small engines cant take the ethanol, so we have been filling up at the same place. On a jet boat we tinker with, the pure ethanol screws with the timing on it, have to adjust. maybe it has something to do with it, what do ya think?

markw8 Enthusiast

markw8

Posted
Posted

If it won't fire on ether you probably have other problems. There's no reason that it won't run on a 10-15% ethanol blend. It might help a tech to use GMs Tech 2 or equivalent scanner. They would be able to see beyond the codes at everything thats happening or isn't.

 

Mark

 

SORRY about multiple posts

markw8 Enthusiast

markw8

Posted
Posted

If it won't fire on ether you probably have other problems. There's no reason that it won't run on a 10-15% ethanol blend. It might help a tech to use GMs Tech 2 or equivalent scanner. They would be able to see beyond the codes at everything thats happening or isn't.

 

Mark

markw8 Enthusiast

markw8

Posted
Posted

If it won't fire on ether you probably have other problems. There's no reason that it won't run on a 10-15% ethanol blend. It might help a tech to use GMs Tech 2 or equivalent scanner. They would be able to see beyond the codes at everything thats happening or isn't.

 

Mark

sdmp Enthusiast

sdmp

Posted
  • Author
Posted

Thank you guyes for your help again. Today, the "new" mechanic had to replace the "china" junk distributor cap with an AC Delco one, and now there is fire. He could not finish today, but thinks the ignition module will also have to be replaced with a different brand. So I think you were right on the aftermarket parts being the problem. So hopefully the three week nightmare will be over tomorrow :cool:

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