1993 Suburban K2500 350TBI Stalling Troubleshooting
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1993 Suburban K2500 350TBI Stalling Troubleshooting
I could really use some expertise and advice. I have a 1993 Chevy Suburban K2500 with a 350 TBI engine and I'm having stalling issues. The check engine light is off.
Basically, when I push down on the pedal too far the engine will stall out at lower speeds or from a start when warmed up. It will stall backing out of the driveway or out on the street if it's not fully warmed up. Once warmed up and traveling on the open road, she has plenty of power. Related to this, when this problem cropped up it started taking a few seconds to engage the transmission when I drop it into drive.
What have I done so far?
1) I changed the fuel filter.
2) I changed the spark plugs.
3) I checked the EGR valve.
4) I changed the PCV valve.
5) I sprayed cleaner down the throttle while running.
6) I changed the throttle position sensor.
7) I disconnected the battery for an hour to reset the computer.
The conditions haven't changed at all.
Other helpful information(maybe???): The exhaust system has a hole in the pipe after the catalytic converter right before it enters the muffler.
You can hear the fuel pump making a soft whine while the truck is running and the gas cap is off. I doubt it's the fuel pump but haven't discounted it yet. It seems like it has no problem supplying the fuel needed when driving.
Any help would be appreciated! I'm not the handiest when it comes to mechanical work but I get through it with brunt force and awkardness. I'd rather try to fix this myself or at least have an idea of what is wrong before turning it over to a mechanic who might feel the need to go easter egg hunting.
Basically, when I push down on the pedal too far the engine will stall out at lower speeds or from a start when warmed up. It will stall backing out of the driveway or out on the street if it's not fully warmed up. Once warmed up and traveling on the open road, she has plenty of power. Related to this, when this problem cropped up it started taking a few seconds to engage the transmission when I drop it into drive.
What have I done so far?
1) I changed the fuel filter.
2) I changed the spark plugs.
3) I checked the EGR valve.
4) I changed the PCV valve.
5) I sprayed cleaner down the throttle while running.
6) I changed the throttle position sensor.
7) I disconnected the battery for an hour to reset the computer.
The conditions haven't changed at all.
Other helpful information(maybe???): The exhaust system has a hole in the pipe after the catalytic converter right before it enters the muffler.
You can hear the fuel pump making a soft whine while the truck is running and the gas cap is off. I doubt it's the fuel pump but haven't discounted it yet. It seems like it has no problem supplying the fuel needed when driving.
Any help would be appreciated! I'm not the handiest when it comes to mechanical work but I get through it with brunt force and awkardness. I'd rather try to fix this myself or at least have an idea of what is wrong before turning it over to a mechanic who might feel the need to go easter egg hunting.
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Joined: Apr 2006
Posts: 11,337
Likes: 194
From: KC, MO area
Welcome to the forum. The first thing I would do is check the fuel pressure. You can get a gauge at Harbor Freight for about $20 to $30. It should be about 50 pounds with the key on and the engine off. It should also run about that with the engine running. With the engine off and the key off, it should hold pressure for a few minutes.