I'm having a hesitation problem with my 1999 WS6 between 2000-3000 RPM so I did the following (in order): Car has 38,000 miles). I've searched the forums and found other people with the same problem but no solution... please help.
1. Ran Redline fuel injector cleaner (nothing)
2.Replaced PCV valve (didn't do anything)
3.Replaced gas filter (nothing)
4.Replaced spark plugs with NGKs (nothing). I had a whiteish looking powder on the old ones.
Checked wires for resistance, they were all close to one another (320k ohms)
5.cleaned MAF screen (nothing)
6.I finally broke down and brought it to a dealer. They updated the PCM with two newer updates and replaced 2 of my O2 sensors ($150 each + $200 in labor). This seemed to work but the hesitation is back (only days later). I checked the throttle position sensor for resisitance and the needle moved smoothly (no sudden jumps or falls) although maybe this is it intermittingly???
I'm going to bring it back to the dealer but would like some ideas from you guys.

Thanks
Shawn

1999 WS6, upgraded airbox (clear lexan), K&N, BMR strut tower brace... turbo in the future

 

Anyone? Help....

 

have you recently gotten a tune?

https://ls1tech.com/forums/pcm-diagnostics-tuning/343234-slight-part-throttle-hesitation.html

 

I've never gotten a tune... my motor is bone stock. I'm just trying to get it to run the way it used to.

I'm in Ihtaca, NY (south of Syracuse) does anyone know a place that could help me out better then a regular dealer?

Thanks for the help in advance....

 

Clean your MAF, maybe some oil from the K&N got on the wires.

 

I already cleaned the MAF with some electonic cleaner (spray bottle). How about the throotle position sensor... I've tested it for a smooth sweep with an anolog voltmeter and it was good but maybe its different under load (vs. just the resisitance I was looking at). If I put a new one on do I need to calibrate it?

Thanks
Shawn

 

Go to the dyno with a repatable LS1 edit/hp tuner program and enjoy how your car runs, the phucktards at the dealer are only there to pad their commision for the week.

 

Any recomendations in the upstate NY area (Ithaca)?

 

ttttt

 

Update: About a week and a half or two weeks ago I took out my MAF out again and this time emptied about ½ of the can of electrical cleaner on it figuring what did I have to loose. I sprayed the sensors from every different angle (with the supplied tube attached to the can to get a powerful stream). I even sprayed inside the plug side and in the slotted windows above the plug. After installing it back in the car I went for a test drive… it’s like I gained 100 HP! The problems are gone and I finally have my car back to the way it was meant to be… thanks for everyone’s help on the matter (I noticed 118 people read my thread!) and I hope my experience helps others.

Thanks again,
Shawn

 

Shawn,
thanks for posting your efforts, I have the same problem and now I have something definitive to try first thats not expensive of a fix. hey if youre ever in Rchester shoot me an email and we'll go cruisin with some other LS1 guys!

-Owen

 

you know i have a slight hesitation also. but it is at one speed. looks like it is right around 46MPH everytime. never at any other speed. it is the weirdest thing. it'll do it in 4th or 5th (more noticeably in 5th...) i have a 99 t/a M6.

 

A friend of mine had a similiar problem with his 99 SS. It was a dirty MAF also. Makes me think I should like go clean mine real soon.

 

yet another reason Speed Density owns all.........