Slight hiccup/stumble while accelerating under load

srponies · 12-21-2005, 08:22 AM

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.

BarnOwl · 12-21-2005, 05:13 PM

Sounds like it might be EGR. However, if you've still got a plastic tipped ECTS in there, I'd do that first.

katarn444 · 12-21-2005, 06:32 PM

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.

Katarn

12-21-2005, 08:22 AM	#1
srponies Member Join Date: May 2002 Location: trevor, WI Posts: 231 srponies's Photos 1997 SL2 1997 SL2	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.

12-21-2005, 05:13 PM	#2
BarnOwl Super Member Join Date: May 2005 Location: Hickory, NC Posts: 10,029 BarnOwl's Photos 2000 SW2 1998 SL2	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. ... There is nothing more frightening than ignorance in action.

12-21-2005, 06:32 PM	#3
katarn444 Member Join Date: Mar 2005 Posts: 126	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. Katarn

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