Throttle Position Sensor? Bogging down problem...
05-30-2009, 08:11 AM
#1
Junior Member
Thread Starter
iTrader: (1)
Join Date: Mar 2009
Location: Terre Haute, IN
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1988 Camaro
Engine: 305 TBI
Transmission: 5sp manual
Throttle Position Sensor? Bogging down problem...
Just recently in my 88 camaro with a 305 I have had a problem with bogging down. No matter what gear im in (its a 5 spd) if you get into it too quickly it bogs way down and doesnt recover until you ease out and back in on the accelerator. If you start out by easing into the throttle it does ok but takes a while to get up to speed. I am thinking its a throttle positon sensor. Any other ideas? Thanks
05-30-2009, 08:51 AM
#2
Supreme Member
Join Date: Jan 2007
Location: OC CA
Posts: 1,873
Likes: 0
Received 0 Likes
on
0 Posts
Car: 75 Beast
Engine: 383 +EBL Flash
Transmission: 700R4
Axle/Gears: 4.11 with 33"
Re: Throttle Position Sensor? Bogging down problem...
Hank
TPS - Probably not - but you can easily check TPS with DVM to make sure that it does not have a worn spot at near WOT position. Basically, with engine off, ignition on measure Pin B (backprobe connector, do not damage harness) voltage of the TPS connector relative to ground (Pin A). Voltage should change smoothly from about 0.6 volts at idle to about 4.3 - 4.6 VDC at WOT.
Most likely it is your fuel pump on the last legs. Check TPS as outlined above to exclude TPS out of your trouble tree.
//RF
TPS - Probably not - but you can easily check TPS with DVM to make sure that it does not have a worn spot at near WOT position. Basically, with engine off, ignition on measure Pin B (backprobe connector, do not damage harness) voltage of the TPS connector relative to ground (Pin A). Voltage should change smoothly from about 0.6 volts at idle to about 4.3 - 4.6 VDC at WOT.
Most likely it is your fuel pump on the last legs. Check TPS as outlined above to exclude TPS out of your trouble tree.
//RF
05-30-2009, 09:09 AM
#3
Junior Member
Thread Starter
iTrader: (1)
Join Date: Mar 2009
Location: Terre Haute, IN
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1988 Camaro
Engine: 305 TBI
Transmission: 5sp manual
Re: Throttle Position Sensor? Bogging down problem...
The fuel pump was just replaced less than 1000 miles ago. This is a restoration car. Fuel Pump was going bad when we got it and we replaced it.
05-30-2009, 09:10 AM
#4
Junior Member
Thread Starter
iTrader: (1)
Join Date: Mar 2009
Location: Terre Haute, IN
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1988 Camaro
Engine: 305 TBI
Transmission: 5sp manual
Re: Throttle Position Sensor? Bogging down problem...
also it seems to be running really rich
05-30-2009, 11:31 AM
#5
Supreme Member
Join Date: Jan 2007
Location: OC CA
Posts: 1,873
Likes: 0
Received 0 Likes
on
0 Posts
Car: 75 Beast
Engine: 383 +EBL Flash
Transmission: 700R4
Axle/Gears: 4.11 with 33"
Re: Throttle Position Sensor? Bogging down problem...
The only way to get to root cause is to check, measure & verify.
Bad MAP sensor may cause rich condition and loss of power at WOT. Do you have SES light indicating DTC codes??? If not get a paper clip and short pins A&B on ALDL connector.
Even new pumps are known to fail - verify your fuel pressure.
//RF
Bad MAP sensor may cause rich condition and loss of power at WOT. Do you have SES light indicating DTC codes??? If not get a paper clip and short pins A&B on ALDL connector.
Even new pumps are known to fail - verify your fuel pressure.
//RF
Thread
Thread Starter
Forum
Replies
Last Post
9192camaro
Engine/Drivetrain/Suspension Parts for Sale
16
02-03-2019 12:21 AM
someone972
Transmissions and Drivetrain
6
08-30-2015 12:52 AM
mdtoren
Tech / General Engine
0
08-16-2015 05:45 PM
