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Old 12-21-2005, 08:22 AM   #1
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1997 SL2
1997 SL2
Default Slight hiccup/stumble while accelerating under load

Drove my wife's '97 SL2 (133k miles) last night and found that it stumbled while lightly accelerating under load. Like when driving in town, 35-40mph, 5th gear, 1200rpm, and giving it the gas it would stumble once or twice while speeding up. Seemed to be prominant when bogged down/ low RPM load.
It has been a while since any work was done on this car. What should I be tackling here first? EGR? ECTS? Plugs & wires? Fuel filter?

One other thing is that for a long time (1yr.+) the car had the check engine light on due to a bad converter (I think that's what the code was). Wouldn't you know I just ordered and received a new cat 2 weeks ago and the light had gone out.

Thanks for all ideas.
Steve H.
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Old 12-21-2005, 05:13 PM   #2
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2000 SW2
1998 SL2
Default Re: Slight hiccup/stumble while accelerating under load

Sounds like it might be EGR. However, if you've still got a plastic tipped ECTS in there, I'd do that first.
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Old 12-21-2005, 06:32 PM   #3
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Default Re: Slight hiccup/stumble while accelerating under load

That is exactly what my bad EGR does. To test it on my 93 I plugged the vac line( which throws a code) and it works great. I am not sure if that indicates bad EGR or EGR solenoid. This only works on the older vac controlled EGR's.

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