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Hesitation accelerating, stealership says nothing's wrong?

pontiac98

pontiac98

New member
I have a 1998 GTP with about 129,000 miles and for the past few months when I am at a standstill it makes a sputtering sound from the exhaust and there's a 1-2 second delay from when I hit the gas and the time that the car actually moves. The stealership told me that they couldn't find anything wrong with it. It does have an SES light on, but from what I understand that's just an emissions code and my mechanic told me that it doesn't affect the driveability of the car at all (I forget the actual code number). I had the supercharger replaced a few months ago and that is when this all started. The supercharger was out of 1997 regal GS. The spark plugs look a little worn but nothing too bad at all. The spark plug wires were also replaced about 50,000 miles ago (last spark plug change). However, I believe that all 3 ignition coils are the originals. Any help is greatly appreciated!
 


Sounds like you need to re-learn your throttle pedal. With the key on, push the pedal to the floor and hold for 3 sec. Let off and pump it to the floor and release 5 times in 7 seconds. Turn the key off, then try it.
 
I thought that the 98+ blowers were different in the vac. line routing. 97 was an odd ball year for the Gen 3 blower. Borrowing some pics from Scotty, check your vac line routing. Might be all wrong.

97 vac lines should be like this.

2011-07-04_145638_vacuum.jpg



or you can cap off the vac tree on the blower and do it the 98 up way.

2010-04-04_183929_Untitled.jpg
 
And to verify what year blower you actually have, take a look at this pic and look at the green circled #2. That is a vac. tree for a 97 blower.

images
 
Thanks for all the input!! It's too dark now to mess with it but I will definitely try all of your advice. I would usually be quicker to respond but I was at a Reds baseball game for a while. Thanks again :)
 


pontiac98 said:
How would you suggest to find a vacuum leak? I'm really not sure where all the vac lines are at.
Click to expand...


spray carb cleaner at the vac lines, if the idle jumps up you found your leak area.

you see the routing in them diagrams. they are the hard plastic lines. start under the snout, then follow that line around the engine.
 
Sounds easy enough, but it doesn't idle rough at all.. or will the RPM just go up? It sounds like it always has though and we've owned this car for about 8 years.
 


Yea that would be pretty cool if you wouldn't mind checking it out, but I can't afford a tune right now (really wish I could!!)... I didn't get a chance to get a can of carb cleaner today but I'll just try that first. I can get it from work for like $5. I heard that method is really dangerous though, what do you think about it? Is there a safer method that might not burn my car down?
 


Ok, I thought I heard somewhere that Carb cleaner is very easy to ignite, could be wrong though... I'm sure you guys know more than I do about that haha. I'll give it a shot then
 
with a open flame it is. its fine to spray at the engine. ive done it 100's of times with no fires ever. your just spraying the upper intake area. no the exhaust manifolds.
 
get the parts store brand. its cheap enough for what your wasting it on.

same goes for brake cleaner, cheap parts store brand works fine.
 
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