Question about 1998 GMC Sierra

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My vortec 350 sierra is shifting weird

My gf put a chip in my truck idk wat kind she wont tell me but ever since she did it the truck use to go into overdrive and stay in over drive afta 40mph now it kicks around shifts into overdrive at 30 or wont go into overdrive at all help please

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My 1997 suburban dont go over 40mph please help

Posted on Mar 11, 2013

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Try removing the chip first and see what happens

Posted on Jun 02, 2009


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Ok I am wondering if my motor in my 91 gmc 5.7 l b8 is a vortec or a 350 it has throttle body carb and not sure thought if I could interchange it with an older 350 ..

Here, is what I think you are asking. The TBI intake from a 91 will fit the same size engine from 88 to 95. The Vortec didn't come out till 96 I believe. So if your 91 is the original engine then it is not a Vortec motor. If you want to swap your 5.7 with another 5.7 (5.7 = 350) Then the 88-95 should work, Just double check your sensors and locations as the plugs may be different and or in different locations. I know my 88 GMC and my 94 chevy (both K1500's) were a little different. Hope this helps.

Jan 17, 2015 | 1991 GMC Sierra

1 Answer

How to set the timing on a 350 vortec engine

What year motor Does it have a distributer or what

Nov 23, 2014 | 2008 GMC Sierra 2500

1 Answer

1997 Gmc sierra 1500 350 vortec wont start

The distributor is out of time. Bring it back to #1 TDC and try to drop it in. If it doesn\'t go in all the way, it\'s because the oil pump drive isn\'t lining up. All you do is have someone "tap" the engine over in very short bursts. Eventually it will line itself up and drop in. Unfortunately, even if you get it started, you will probably get a check engine light. If you do, you will need access to a scanner that will display data. Look for a data line called "CMP Retard", make small adjustments to the timing and snap the throttle. Get this reading as close as possible to 0. I believe the tolerance is +/- 2 degrees. If you can\'t get it close enough, the distributor is still out a tooth. ALSO, keep in mind that the air filter must be in place. Without the inlet hoses, the mass airflow sensor cannot read properly.
Good luck!

Feb 01, 2013 | 1997 GMC Sierra

1 Answer

What is the operating parameters for the fuel pressure regulator in a 1997 sierra 1-ton 350 vortec

It should maintain the fuel pressure at about 55 psi when the engine is at idle.

May 16, 2010 | 1997 GMC Sierra

1 Answer

I have a 98 k1500 with 5.7 350 and it wont start, has spark and fuel at the tbi but the injectors wont fire, will run on ether if sprayed down the tbi any ideas

have the fuel pressure checked ,im assuming it is a vortec,
you need about 55 psi continusly to keep it running, i have a 96 2500 sierra. the fuel pumps were known to be terrable in these trucks. i put a new one in, then had to remove it to replace it again amonth later, they are flawed by manufacturing design.

Dec 16, 2009 | 1998 Chevrolet K1500

1 Answer

I have a 1998 chev z71 350 Vortec with a blown transmission (push button 4x4) Can i take the transmission out of a 1997 gmc sierra 5.7 liter (Not vortec) (manual shift 4x4) and stick it in my 1998?

Yea as long as they are both manual transmissions everything will bolt up the same.If you use your old transfer case you will still have push button.

Oct 28, 2009 | GMC Sierra 1500 Cars & Trucks

1 Answer

Whats needed to convert 1996 from 5.0L vortec to 5.7L vortec

hi all the exturnel parts are the same a 350 will go right in .the valve covers,intake oil pan all the same

Jul 20, 2009 | 1996 GMC Sierra

1 Answer

Fuel Pressure

around 10 -14 psi i would go with on a 350 Gm Yep!

May 08, 2009 | 1999 Chevrolet Silverado 1500

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