Does Anyone Have a Clue?

billys94

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Im a proud owner of a 1994 2.2 5 speed 2wd GMC Sonoma SL. Bought new in 93' with only 23 miles at time of signing paper. The body is pushing 320,000 miles and the second motor has around 80,000. Ive put only 8 or 9 thousand in the last 10 years. Now to my question. I do drive it still sometimes to keep everything from dry rotting and what knot. I work 63 miles from home. I can start it in the mornings and go to work and you cant ask for a better truck. I can leave work and go straight home, and you cant ask for a better truck. If I stop anywhere in between and turn the key off, get back in it, it will start very quickly, but when you take off, its like its on its last 3 drops of gas, and feels like a bucking bull until you get up to about 70 or 75. You can still feel it and know its ther though. Once you let it sit overnight and start over in the morning, its like new again. I have done changed o2 sensor,fuel filter, run sea foam thru tank twice, cleand the heck out of the air induction, which dont have no air sensors, air filter, plugs are new also. The gas needle does bounce like crazy at times,and like a steady bounce the rest of the time. Im thinking maybe and I hope not the fuel pump or sending unit? What about the EGR valve? Any help would be appreciated.
 
I'd put my money on the in-tank end of the fuel system - either the connections to the pump are corroded, or the fuel pump ass'y has issues.

I'm lazy, so I hate to say that I'd pull the pump/prefilter/sending unit (ass'y)
and go thru it, cleaning everything up. (probably requires pulling the tank or bed)

It's been good to you, give it a treat.


luck,greg
 
Is it giving any codes? My 02 Sonoma had a misfire on cylinder #2 and acted somewhat like you are describing. didn't run it long. Found out the injector was stuck open (poppet valve in my case).
 
Is it giving any codes? My 02 Sonoma had a misfire on cylinder #2 and acted somewhat like you are describing. didn't run it long. Found out the injector was stuck open (poppet valve in my case).

No. Thats the funny part. The check engine light has not once come on. And I know it works. I drove it to work again yesterday, no problem. Drove it back home without stopping and restarting, and had not one hesitation.
 
I'd put my money on the in-tank end of the fuel system - either the connections to the pump are corroded, or the fuel pump ass'y has issues.

I'm lazy, so I hate to say that I'd pull the pump/prefilter/sending unit (ass'y)
and go thru it, cleaning everything up. (probably requires pulling the tank or bed)

It's been good to you, give it a treat.


luck,greg

Looks like a "fairly" simple task to pulling the tank. As far as the Chilton manual anyway. I would like to look at all other options first. If not, they will all be new. 18.5 years it needs more than one treat. Thanks for the advice.
 
I had read recently that one person removed the bed bolts on one side, loosened the other, then was able to lift the bed high enough to r&r the pump ass'y.

Saves disconnecting the electrical, I bet.

luck,greg
 
Thanks to all. As I was changing my master cylinder, I noticed the broken wire from the a/c was grounding out on the frame. Taped in up, since a/c dosent work anyhow. Problem solved.
 
God, I love when a group of highly trained professionals put their minds together & track down a complicated issue LOL

Nice job, sometimes it's better to be lucky than smart

luck,greg
 


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