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Old 12-14-2011, 08:41 AM   #1
dsquare86
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2002 SL1
2001 SL2
Default Bucking Under Light Load and Then Stall

Ok guys, this one is a bit tricky. Whenever I am taking one certain exit off the interstate that has a moderate uphill grade, it requires light throttle in order to maintain speed until the end of the ramp where we stop. During light throttle the car will begin to buck, if this continues then the car will stall and restarting is very difficult. Once started car acts like nothing ever happened.

The following items are new on the car:
Air Filter, Plugs, Wires, ICU, EGR, TPS, IAC, Fuel Filter/Regulator (Napa), CPS, ECTS, IAT, Upstream O2 Sensor, Throttle Body Cleaned.

The car is only throwing a CEL for secondary air pump.

I am starting to suspect the fuel pump or the MAP sensor. Advice?

2001 SL2 246k, 5 Speed. Recently replaced the head.

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Old 12-14-2011, 09:53 AM   #2
RobCampau
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Default Re: Bucking Under Light Load and Then Stall

Could very well be a fuel pump. Check the fuel pressure.

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Old 12-14-2011, 11:16 AM   #3
dsquare86
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Default Re: Bucking Under Light Load and Then Stall

Quote:
Originally Posted by RobCampau View Post
Could very well be a fuel pump. Check the fuel pressure.
Remind me again what fuel pressure should be?

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Old 12-14-2011, 06:40 PM   #4
SC2BuzzBomb
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Default Re: Bucking Under Light Load and Then Stall

With 246K on the ticker, it appears this car is ready to give up the ghost and be flushed down the cosmic toilet.

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Old 12-14-2011, 06:54 PM   #5
dsquare86
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Default Re: Bucking Under Light Load and Then Stall

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With 246K on the ticker, it appears this car is ready to give up the ghost and be flushed down the cosmic toilet.
Thanks but that's no help.

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Old 07-03-2012, 10:06 AM   #6
dsquare86
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Default Re: Bucking Under Light Load and Then Stall

Sorry to revive old threads but this issue was addressed by gutting the pre-cat and replacing the main catalytic converter.

...
Derek
2002 Saturn SL1 SOHC 5 Speed.
2001 Saturn SL2 DOHC 5 Speed - Retired.

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Old 07-03-2012, 01:13 PM   #7
RobertGary1
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Default Re: Bucking Under Light Load and Then Stall

Curious, did you use a back pressure gauge to determine that or trial-and-error?

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Old 07-03-2012, 01:44 PM   #8
dsquare86
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Default Re: Bucking Under Light Load and Then Stall

Quote:
Originally Posted by RobertGary1 View Post
Curious, did you use a back pressure gauge to determine that or trial-and-error?
Neither. The catalytic converter saga is detailed in this thread. In hindsight my catalytic converter was ailing my car for a long time. This thread was the initital symptom. It progressed to the point that the car would idle ok, but did not have enough power to even go up a relatively flat driveway and the exhaust was actually exiting the exhaust manifold gasket. My muffler has had holes in it for many years and towards the end of the original cat, it was actually very quiet.

...
Derek
2002 Saturn SL1 SOHC 5 Speed.
2001 Saturn SL2 DOHC 5 Speed - Retired.

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