Need some Chevy insight

NYSpeed Automotive
1

I need some help with a couple issues in my DD. It’s a '90 Silverado rwd, with a TBI 305 with about 171k.

The last couple gas fill up’s(I shut off truck when I pump gas) and only an appearing problem after I pump gas, I go to start the truck up and the battery light comes on while my batt gauge reads 9v. Either the truck stalls or after less then a min the light goes away and the gauge returns to 14v.

I thought maybe battery or alt, but at idle I get a reading of 13.9-14.2v so now I believe it’s something else?

The other problem that developed over a month ago is the cold startups, the truck either stalls or wants to stall if I don’t give it gas then runs/drives like crap, It runs all sluggish like it’s missing if I floor it the truck goes no where and just makes a popping noise. Then it’ll run like a champ once the normal temp is reached.

In the last month, I’ve replaced, plugs and wires, fuel filter, had a lean o2 so has a new o2 sensor timing was checked and held stock 0 but I added a little bit more timing without getting knock, cleaned out the throttle body and the truck has not changed one bit. I tested the coolant temp sensor and it works fine.

Only thing I have not done is take the distributor cap off to check for crack though it looks fine, check rotor and dist it self. I also through up there maybe a bad fuel pump since it takes a while to start up when cold, even though it always had that problem since I bought it two years ago. The tbi doesn’t make it any easier to check fuel press either.

Sorry for the long post, I don’t really have the time to fuss around with this piece. I work everyday and barely have the freetime…

Any help is appreciated thanks.

2

If you want to check the fuel pressure I can help you out with that, I have a Master Fuel Pressure tester that can measure any of them.

The after fueling thing almost sounds like your tank sender or a wire involved with it is toasted.

Did you clean the IAC? I’m wondering if it’s stuck a little and works fine when you’re idling warm, but doesn’t flow enough air when it’s cold.

3

Thanks for the offer to help, I’m just gonna park the truck because it has gotten even worse. It’s makes a gun shot noise out the exhaust and now even when it’s warm it stalls making right turns, or at random times if I let off the throttle.

I’m gonna have to drop the gas tank cause now it’s most likey something with the fuel, brand new o2 sensor and it’s still throwing a lean issue on my scanner.

I just don’t have the time for this truck nor do I really want it, two years of hauling and it’s usage has pretty much paid itself off. Time to use the car.