Another hesitation problem...
Thread Starter
Teching In
Joined: Apr 2002
Posts: 10
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From: Las Vegas, NV
Another hesitation problem... Well, I read through some of the existing threads regarding hesitation problems and couldn't find an answer to my problem so I thought I'd post one of my own...
My car has a decent stumble around 1600-1800 RPM which clears up at about 2k. This is only under part throttle, and doesn't seem to effect WOT performance. I've hooked the car up to a friend's Autotap and there was nothing out of the ordinary as far as he could tell.
Also, if I'm driving the car normally and come to a stop light the idle will drop to about 400 then come back up to normal. Over the past 3 months it has happened bad enough a couple of times to actually kill the car.
So far we have tried a new air filter, plugs (though no wires), fuel filter, and idle relearn. Nothing has helped.
The car is a 99 Formula 6-speed with basic boltons and a little shot of nitrous. Any help would be greatly appreciated.
Thanks,
Peter
<small>[ April 01, 2002, 04:39 AM: Message edited by: 99Formula ]</small>
My car has a decent stumble around 1600-1800 RPM which clears up at about 2k. This is only under part throttle, and doesn't seem to effect WOT performance. I've hooked the car up to a friend's Autotap and there was nothing out of the ordinary as far as he could tell.
Also, if I'm driving the car normally and come to a stop light the idle will drop to about 400 then come back up to normal. Over the past 3 months it has happened bad enough a couple of times to actually kill the car.
So far we have tried a new air filter, plugs (though no wires), fuel filter, and idle relearn. Nothing has helped.
The car is a 99 Formula 6-speed with basic boltons and a little shot of nitrous. Any help would be greatly appreciated.
Thanks,
Peter
<small>[ April 01, 2002, 04:39 AM: Message edited by: 99Formula ]</small>
TECH Senior Member
Joined: Nov 2001
Posts: 7,234
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From: Mississauga, Ontario
Re: Another hesitation problem... Peter, I know it's a longshot, but my LT1 Formula had a bad part throttle surge at 1500rpm which was cured with a new EGR valve. I wonder if the same problem is happening on your LS1? It's worth a shot! Good to see you over here by the way old friend!
<small>[ April 02, 2002, 12:34 PM: Message edited by: Patman ]</small>
<small>[ April 02, 2002, 12:34 PM: Message edited by: Patman ]</small>
Thread Starter
Teching In
Joined: Apr 2002
Posts: 10
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From: Las Vegas, NV
Re: Another hesitation problem... </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Patman:
<strong>Peter, I know it's a longshot, but my LT1 Formula had a bad part throttle surge at 1500rpm which was cured with a new EGR valve. I wonder if the same problem is happening on your LS1? It's worth a shot! Good to see you over here by the way old friend!</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Pat,
Good to see you too mang, you staying away from that "other" board? <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
As for the EGR valve, it's worth a shot anyway. I have no clue at this point and it's really friggin annoying. Car died again today when I pulled to a stoplight. Between this and my clutch problems I'm about ready to light the thing on fire.
Peter
<strong>Peter, I know it's a longshot, but my LT1 Formula had a bad part throttle surge at 1500rpm which was cured with a new EGR valve. I wonder if the same problem is happening on your LS1? It's worth a shot! Good to see you over here by the way old friend!</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Pat,
Good to see you too mang, you staying away from that "other" board? <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
As for the EGR valve, it's worth a shot anyway. I have no clue at this point and it's really friggin annoying. Car died again today when I pulled to a stoplight. Between this and my clutch problems I'm about ready to light the thing on fire.
Peter
Re: Another hesitation problem... You might check the gasket around the EGR tube where it enters the intake manifold. Maybe get a new o-ring gasket and see if that helps. If you have taken that out, it might not have resealed properly. It happened to me after I did the !egr mod.
Eric
Eric
