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developed 2 new problems

dcmargush

By dcmargush
in Ask A GM Technician

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dcmargush Enthusiast

dcmargush

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My truck (99 2500 silverado, 6.0L) has deveoped two new problems. I kind of think they are related, but not sure.

 

1. The truck is hard to start when there is heat in the engine. You first fire it up and it starts fine (almost like it is sitting right on a compression stroke). You bring it up to temp(190-200), shut it off and run into a store, or let it sit for a while. the temp comes back down to approx 160 (less than normal op. temp). In order to start it you must crank and crank and crank, it then fires and will have a rough idle and will smell flooded or rich, you can also shorten the cranking by applying the throttle (yes I know a no-no on FI engines).

 

No codes have been registered.

 

2. While on a hunting trip in PA (temps dropped to 0) we would let the truck warm up in the morning, it would start fine (engine is cold remember), then would idle down when the choke would close (I assume it has an auto choke), than after about 3-5 min it would start to hunt or surge. the Tank was full and the there was no problem driving it so the fuel lines were not frozen.

 

Since the hunting/surging has started it has thrown check engine codes(3 times - but then they clear them selves out.) but they are intermittant so I have not been able to have them read.

GM-Tech Senior Enthusiast

GM-Tech

Posted
Posted

Most likely a leaking fuel pressure regulator. Pull the vacuum hose off the regulator and see if there's fuel in it. Sometimes starting the engine with the hose off will cause fuel to spit out of the vacuum pipe on the regulator.

 

There is no choke, auto or otherwise. Those went out with carburetors. :confused: If your check engine light came on, there's a code stored, even if the light goes out.

dcmargush Enthusiast

dcmargush

Posted
  • Author
Posted
Most likely a leaking fuel pressure regulator.  Pull the vacuum hose off the regulator and see if there's fuel in it.  Sometimes starting the engine with the hose off will cause fuel to spit out of the vacuum pipe on the regulator.

 

 

 

 

 

 

So if there is fuel in the vacum line the FP Reg is bad? Right.

dcmargush Enthusiast

dcmargush

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  • Author
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So it happened last night, and I pulled the vacum line and sure enough fluid ran out (assume it is gas).

 

Is the regulater a difficult part to get?

GM-Tech Senior Enthusiast

GM-Tech

Posted
Posted

It can only be gas. Nothing else there. No, you can buy that regulator quite easily. Dunno if the aftermarket places have it, but I would imagine so.

dcmargush Enthusiast

dcmargush

Posted
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Just to carry the infor forward:

 

I have 1999 Silverado 2500 with th 6.0L engine. Is the GM p/n for the the FP reg 17113678?

dcmargush Enthusiast

dcmargush

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I have 1999 Silverado 2500 with th 6.0L engine.  Is the GM p/n for the the FP reg 17113678?

 

 

 

 

No clue. I'm not a parts guy.

 

 

 

 

 

Replaced it last night, fixed the problem. Thanks.

 

FYI:

 

OK, so I went to the dealer with the p/n I had (above), no such part, I got that part number from gmpartsdirect.com. My truck has a 6.0L wich kindof stumped the dealer. We used the VIN and go p/n 12574986 for the FP Regulator (Total bill $113.00). this morning I looked that p/n up on gmpartsdirect.com and the retail is $60 some, and their price is $33 somthing. Lesson learned, trouble shoot with gm-trucks.com get p/n from dealer and order from GMpartsdirect.com.

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