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1995 gmc sierra stumbles when accelerating


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truck driver
Novice

Nov 6, 2011, 11:12 AM

Post #1 of 12 (6189 views)
1995 gmc sierra stumbles when accelerating Sign In

i have a 5.7 350 tbi in this truck w/123000 miles engine stumbles when light pressure is applied on go pedal but give it just a little more and she goes just fine runs great other wise no service engine soon light some things i did right before i noticed this problem were put stp fuel system cleaner in gas tank and replaced egr valve


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Nov 6, 2011, 11:56 AM

Post #2 of 12 (6173 views)
Re: 1995 gmc sierra stumbles when accelerating Sign In

Did you use a Delco EGR?
You might want to test for a glitch in the TPS.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



truck driver
Novice

Nov 6, 2011, 12:07 PM

Post #3 of 12 (6159 views)
Re: 1995 gmc sierra stumbles when accelerating Sign In


In Reply To
Did you use a Delco EGR?
You might want to test for a glitch in the TPS.

not sure had a local shop do it good guys i know and trust also how do i check throttle position sensor


Sidom
Veteran / Moderator
Sidom profile image

Nov 6, 2011, 4:22 PM

Post #4 of 12 (6132 views)
Re: 1995 gmc sierra stumbles when accelerating Sign In

Just for the heck of it, disconnect the vacuum line from the EGR valve & take if for a spin and see if there is any difference


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Nov 6, 2011, 6:47 PM

Post #5 of 12 (6121 views)
Re: 1995 gmc sierra stumbles when accelerating Sign In

Vacuum line? Wouldn't it be electric?



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



truck driver
Novice

Nov 7, 2011, 7:19 PM

Post #6 of 12 (6104 views)
Re: 1995 gmc sierra stumbles when accelerating Sign In

took vac line off runs great but service light comes on im taking the truck back to the shop who put the new valve on


Discretesignals
Ultimate Carjunky / Moderator
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Nov 7, 2011, 7:36 PM

Post #7 of 12 (6100 views)
Re: 1995 gmc sierra stumbles when accelerating Sign In

Make sure that they check the EGR vacuum modulator and vacuum lines too. Funky vacuum signal to the EGR valve could be a possibility also.





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truck driver
Novice

Nov 8, 2011, 4:28 PM

Post #8 of 12 (6085 views)
Re: 1995 gmc sierra stumbles when accelerating Sign In

me and my mechanic checked the vacuum off the egr solonoid and it wasnt right got to to take it back in the morning he is going to chase it down did not have time today what could this mean


Sidom
Veteran / Moderator
Sidom profile image

Nov 8, 2011, 6:09 PM

Post #9 of 12 (6073 views)
Re: 1995 gmc sierra stumbles when accelerating Sign In

What did you mean by "the vacuum wasn't right"?

Doesn't sound to serious, either a bad solenoid. If it was an AM EGR valve, some of those come with an assortment of different sized orfice washers. It's possible that maybe a too large of washer was installed...

But sounds like you are in good hands, I'm sure your guy will get a handle on it & it be back up to 100%


truck driver
Novice

Nov 9, 2011, 8:19 AM

Post #10 of 12 (6063 views)
Re: 1995 gmc sierra stumbles when accelerating Sign In

i will let yall know what the outcome is thanks for the info i dont know what the vac reading was but he said it wasnt what it was supposed to be


truck driver
Novice

Nov 10, 2011, 1:07 PM

Post #11 of 12 (6050 views)
Re: 1995 gmc sierra stumbles when accelerating Sign In

turned out to be the aftermarket egr valve put on a delco truck runs great i hope this info can help someone in the future


Tom Greenleaf
Ultimate Carjunky / Moderator
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Nov 10, 2011, 1:14 PM

Post #12 of 12 (6049 views)
Re: 1995 gmc sierra stumbles when accelerating Sign In

Thanks Truck Driver for telling what the problem was and yes it will help someone else,

Tom







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