1999 Chevy Suburban won't slow down.

Asked by GuruLFMGR Apr 28, 2019 at 10:01 PM about the 1999 Chevrolet Suburban C1500 LT RWD

Question type: Maintenance & Repair

I have a 1999 Chevy Suburban with the 5.7 liter motor. When I let off the
gas, the truck doesn't slow down right away, it kind of coasts as if you shifted
it into neutral, and then somewhere between 3 and 10 seconds you feel the
back pressure and it starts to slow. I can have the gear shift in any position,
D, 3, 2, 1 and it acts this way.

If I disconnect the Throttle Position Sensor (TPS), the issue goes away.
When you let off the gas, the truck starts to slow right away, like a normal
vehicle. However, running with the TPS disconnected causes bad things and
so it's not a long term fix. I've replaced the TPS with a known good one and it
drives the same.

A neighbor has an identical truck and it does the same thing. His has over
200k miles and it's "..done it forever, I think since new." Mine has low miles
but I haven't had it since new but it's done since I've had it.

What's causing this and what's the fix? Dealerships tell me it's the way it's
designed, nothing can be done. Some people say I need a new "chip" that
will give more power and will fix it but they can't tell me why so I'm not so
sure they know.

Thanks

1 Answer

Same here: 1999 Suburban with a "350" and 100k. I've had this truck since new and since new it's coasted after letting up on the go pedal. I hate it. I think it contributes to the horrible brake life. Maybe the knuckleheads designed it this way to somehow comply with emissions standards? Makes no sense to me and I'd LOVE to have a solution!!!! For now, when I drive this beast (is the wife-mobile) I pop it into N for a second or two when approaching a light then back to O or D. Not a good way to drive.

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