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Old 07-04-2005, 03:43 AM   #1
tgferg67global
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Default 97 SC1 partial throttle surging/power loss

I have some acceleration problems I can't pinpoint. No SES light.
Under partial throttle, the car slightly misses when cold and and gets much worse when warmed up. When warmed up, under partial throttle, the car loses power and surges/bucks like horsepower is cutting in and out.
Idle, cruising and full throttle are normal.

New items
*Plugs(NGK)
*Wires(Double-Silicone-Autozone)
*Coil Packs(Wells)
*O2 sensor front(Bosch Universal)
*Fuel Filter
*Fuel pump replaced 35,000 miles ago at dealer.

Things I have tried
*Fuel injector cleaner
*Blocked off EGR and problem persisted.
*ECTS is brass already but not sure how old it is.
*Cleaned/Removed throttle body and IAC
*Cleaned sludge from MAP sensor orfice.
*Inspected/Cleaned all connectors and grounds.
*Seafoam combustion chamber cleaner.

Where should I go from here?
Throttle position sensor?
DIS module?
Map sensor?
ECTS (even though mine is brass already)?
Fuel pressure regulator?
Alternator(doesn't seem likely since problem gets worse when warmed up)?

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Old 07-04-2005, 04:36 AM   #2
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Default Re: 97 SC1 partial throttle surging/power loss

I forgot to mention the car is an automatic.
After the car is warmed up the loss of power under partial throttle is so bad that I have to press the gas pedal 1/3 to 1/2 of the way down to accelerate normally compare to just barely touching the gas pedal to get the same power when the car is cold. The whole time this is happening the car surges with more and less power.

Could it be a weird transmission problem such as the torque convertor cutting in and out and/or wrong gear selection masking itself as an engine problem?

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Old 07-04-2005, 08:37 AM   #3
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1995 SL2
Default Throttle Position Sensor

I'd take off and replace the TPS, for years ago, when I replaced my unit, I actually opened up the old unit and found that there was an area on the arch swing, where there was a loss of contact. This may be the case with your unit.
It does wear down.

...
> 95 SL 2 = 649,619 Miles 40.4 MPG, as of 4/19/11. My manual Radiator Fan Switch, courtesy of Wolfman's patient installation guidance, continues to be.......invaluable <

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Old 07-04-2005, 02:50 PM   #4
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Default Re: Throttle Position Sensor

Quote:
Originally Posted by Luke
I'd take off and replace the TPS, for years ago, when I replaced my unit, I actually opened up the old unit and found that there was an area on the arch swing, where there was a loss of contact. This may be the case with your unit.
It does wear down.
Wouldn't a bad contact show up when revving up the engine out of gear?
When I do this no bad spot shows up. The drivability problem seems to occur under load. Do you know if all the TPS is just a potentiometer(like a volume knob on a radio) or is there more to it than that and it could fail another way under load that wouldn't show up when revving the engine up out of gear?

Last edited by tgferg67global; 07-04-2005 at 03:05 PM..

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Old 07-05-2005, 08:54 AM   #5
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Default Re: 97 SC1 partial throttle surging/power loss

> Global <
Very good point; The "load" issue has me stomped.

...
> 95 SL 2 = 649,619 Miles 40.4 MPG, as of 4/19/11. My manual Radiator Fan Switch, courtesy of Wolfman's patient installation guidance, continues to be.......invaluable <

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Old 07-05-2005, 09:14 AM   #6
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Default Re: 97 SC1 partial throttle surging/power loss

Quote:
Originally Posted by Luke
> Global <
Very good point; The "load" issue has me stomped.
Looking through some posts didn't you have a crank position sensor that was causing drivability problems for you?

I just bought a multimeter and will be testing my sensors. Funny feeling that everything will be within range

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Old 07-05-2005, 09:28 AM   #7
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Default Re: 97 SC1 partial throttle surging/power loss

Did you clean up your coilpack bolts? My car used to hesitate and kind of jerk a little while driving at partial throttle. It was unnoticeable while revving in neutral. After cleaning the bolts off w/ my bench grinder brush it was VERY smooth.

That may be your problem...

...
-96 SC2 gets 35 mpg mix city/hw.

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Old 07-05-2005, 09:45 AM   #8
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Default Re: 97 SC1 partial throttle surging/power loss

Quote:
> Global <
> didn't you have a crank position sensor that was causing drivability problems for you? <
Yes, and now I have a back-up unit, hoever, when that fails, the engine will not run at all. It will simply shut down. The engine will turn over when you attempt to start it, but will not start. That would not be your issue.
Quote:
> SOHC <
> Did you clean up your coilpack bolts? <
Nice alert -- didn't even think of that. We do continue to learn...

...
> 95 SL 2 = 649,619 Miles 40.4 MPG, as of 4/19/11. My manual Radiator Fan Switch, courtesy of Wolfman's patient installation guidance, continues to be.......invaluable <

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Old 07-05-2005, 12:34 PM   #9
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Default Re: 97 SC1 partial throttle surging/power loss

Quote:
Originally Posted by sps SOHC
Did you clean up your coilpack bolts? My car used to hesitate and kind of jerk a little while driving at partial throttle. It was unnoticeable while revving in neutral. After cleaning the bolts off w/ my bench grinder brush it was VERY smooth.

That may be your problem...
Yes I dipped them in muriatic acid along with other rusty ground fastners.
They are completely silver.

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Old 07-05-2005, 01:40 PM   #10
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Default Re: 97 SC1 partial throttle surging/power loss

Tps ??

...
-96 SC2 gets 35 mpg mix city/hw.

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Old 07-06-2005, 01:27 AM   #11
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Default Re: 97 SC1 partial throttle surging/power loss

a bad TPS can be tested with a ohmmeter/multimeter.

i can see a bad TPS only showing up under load, remember it is consided the "driver demand" sensor. in park/neutral you aren't "demanding" any power, you have no load, the PCM is only injecting enought fuel to match the airflow and RPM, it is not enriching the A/F for added power, as it would if you were actually accerating.

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Old 07-07-2005, 06:38 PM   #12
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Default Re: 97 SC1 partial throttle surging/power loss

Well I swapped out the TPS sensor with one from a junk yard and the problem still exists. The TPS sensor was fine

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Old 07-07-2005, 08:27 PM   #13
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Default Re: 97 SC1 partial throttle surging/power loss

reset your computer by unplugging the negative battery cable for a few minutes. (get your radio security codes before you do this)

You usually need to do this whenever you change a sensor out (like ECTS) if you didn't it could just be the problem. Also try cleaning the ports that lead to your EGR as well as the EGR just to be sure. Cuz I really can't think of much else.

...
-96 SC2 gets 35 mpg mix city/hw.

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Old 03-28-2010, 01:48 PM   #14
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Default Re: 97 SC1 partial throttle surging/power loss

I never posted the resolution to this problem.
It had something to do with the map sensor. I replaced it and also noticed the area behind the sensor in the intake was packed full of oil with a "grease like" consistancy. I took off the vacuum hose underneath the sensor and sprayed carburator cleaner in the map sensor hole in the intake. Gobs of partially solidified oil came out the vaccum hose outlet on the bottom of the intake. So between the new map sensor and cleaning out the "cavity" caked with oil behind the sensor, the problem was resolved.

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