1999 Chevy Silverado Problem

[Stevie Ray]

My problem is as follows, in the morning, the vehcile starts with 1 turn of the key, I drive to work, app. 8 miles. When I come out for lunch, the truck takes several trys to start, then when it does, it spudars a bit before it gets going smooth. It almost appears to be flooded. it will always start fine in the Morining, or after waiting about 10 to 12 hours. Also once it is running, it runs great, 142,000 miles on this bad boy. I have had the fuel pump changed, the injectors thourghly cleaned , new plugs and and an air temp sensor changed out, still having this problem. Any thoughts out there???

[xjoeharperx]

coolant temerature sensor

[Bubba14]

Pull the vacuum line off the fuel pressure regulator and see if gas comes out. If it does replace it.

[benex]

Have the same exact problem with my 99 Silverado. I have done some research on this common problem. Since you stated that the fuel pump has already been replaced, the next step would be to replace the fuel pressure regulator, especially because you suspect it is flooding. The part number is 17113678. My theory is that a cold engine can tolerate the extra fuel while being started. Let me know if it works.

[LanceM]

Me too, exact same problem, 4.8L, changed the fuel pressure regulator today, fixed the problem. Mine had gas come out when I pulled the vac line off. Took about 5 minutes to change with no tools. The old one came all apart when I removed it, be sure if yours does that, you get all of the o rings out before trying to install the new one.

Lance

[Stevie Ray]

Thanks to all who responded to my problem with my 99 silverado not starting after it had warmed up and then set for about an hour. The fix was the fuel pressure regulator, once I changed it out, the truck starts perfectly now. Thanks again!!

[LanceM]

Thanks for posting your fix, this forum has saved me big $ keeping me from the dealer on out of warranty common problem repairs. I'm glad it was a fix for you!

Lance

[jrae]

Originally Posted by benex

Have the same exact problem with my 99 Silverado. I have done some research on this common problem. Since you stated that the fuel pump has already been replaced, the next step would be to replace the fuel pressure regulator, especially because you suspect it is flooding. The part number is 17113678. My theory is that a cold engine can tolerate the extra fuel while being started. Let me know if it works.

THANK YOU! This post was a lifesaver! After changing the fuel pump, spark plugs, wires, etc..AND being told by the dealer that over $2000 worth of additional work needed to be done to fix the problem, seing this post did the trick. NO MORE PROBLEMS! Thank you!!

[robert15]

Looks like I may have found some answers to my problem here.She kicks right over if I just breathe on the key when it is chilly outside, but if it is a warmer day, or I have been driving her around, especially on a hot day, then it takes forever for her to crank over.VERY confusing and frustrating.I've always heard about cars having a problem starting in the cold, but mine is EXACTLY the opposite. HELP!*!*

[xjoeharperx]

You might have a problem with vapor lock in the fuel system..

[robert15]

Originally Posted by xjoeharperx

You might have a problem with vapor lock in the fuel system..

So, what would be the cheapest means of correcting this problem(of vapor lock in the fuel system) myself??

[xjoeharperx]

If in fact you did have vapor lock it is probably caused by too much heat from your engine. Your cooling system may not be functioning at 100%. See about flushing your cooling system and also have the coolant temp sensor checked. you can check it yourself with a multimeter. There should also be some sort of air temperature sensor in the intake.(im not a chevy mechanic so i cant tell you exactly what setup it has.)
Check the resistance of that sensor too. Write back and let me know what you find...