1998 Chevy Silverado

KTHOMA

MEMBER
1998 CHEVROLET SILVERADO
V8
4WD
AUTOMATIC
178,000 MILES

HI, I have a 1998 chevy 2500 silverado with a 5.7 350, this truck starts, idles, and drives fine, but when you go up a pretty steep hill the transmission will downshift like normal and a few seconds after downshifting the dash and steering wheel start to vibrate and shake. The engine will start to lose power and backfire, a few seconds later it will come out of it and be fine until the next hill, I have done a complete tune up, but the problem is still there. I pull a gooseneck trailer frequently and it is a real pain.
Thanks

4 Replies

JACOBANDNICKOLAS

MECHANIC
108,554 POSTS

Have you checked fuel pump pressure?

Here is a how to:

http://www.2carpros.com/how_to/how_to_check_fuel_pressure.htm

Since you have already done the tune up, I would start there. Also, has the check engine light come on?

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Saturday, August 8th, 2009 AT 9:00 PM

KTHOMA

MEMBER
2 POSTS

I rented a pressure test kit today at auto zone and the fuel pump tested within limits. The guy at auto zone said to unplug the MAF sensor and see if the problem still exists. I did that and the check engine light came on for the first time, the truck started and ran fine, but when I came to a steep hill the problem was still there, but it came out of it and ran fine after that. I plugged the sensor back in, but the check engine light is on all the time now.

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Sunday, August 9th, 2009 AT 2:56 PM

JACOBANDNICKOLAS

MECHANIC
108,554 POSTS

When you return the pressure gauge, have them scan and reset the computer. My guess is the code will be for the MAF sensor. If it's something different, let me know.

When checking the fuel pressure, did you disconnect the vacuum to the fuel pressure regulator?

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Sunday, August 9th, 2009 AT 11:11 PM

KTHOMA

MEMBER
2 POSTS

The light was not on when I drove it this morning, I assume it resets itself. I tried to find the fuel pressure regulator, but couldnt. My haynes manual doesnt give a good discription of it and from what it said the Intake manifold would have to come of to even see it, if that is true or not I dont know, but if you know where it is it would be much appreciated if you give me a hint cause I have no clue. Thanks

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Monday, August 10th, 2009 AT 8:17 AM