Any idea what would cause sputtering at 1500 rpm? It happens cold or warm. I've only really noticed it when trying to slowly bring up the rpm in neutral, and it isn't really much of a bother when I'm driving, because if I give it even moderate throttle it will go right past that point without any problem. I was wondering if it might be a dead spot on the tps or what?

89 GTU stock
105k miles (unnoficial, the spedo cable was broke when I bought it)

 

Tps

 

my car is possesed and forces me to drive fast...it puts thoughts in my head. "faster the cops wont know" or "if you dont go fast ill hate you forever"

 

lol i would think if its bucking it would be b/c the flywheel has hotspots on it basically the little hot spots cause bucking on a 5spd...put some lucas in there and drive at that rpm or an extended period of time it will work its self out... fairly sure that would be it

 

lol i would think if its bucking it would be b/c the flywheel has hotspots on it basically the little hot spots cause bucking on a 5spd...put some lucas in there and drive at that rpm or an extended period of time it will work its self out... fairly sure that would be it

 

Yes, it is bucking when I drive at that rpm (only in 1st or 2nd gear) but it also seems to bog down and sputter when the car is in neutral and I try to hold the rpm at 1500, like I said, it's only with very gentle throttle application, then I can push the accelerator pedal a little bit harder and it will push past the spot and rev up the rest of the way. Still thinkin flywheel?


Oh, and btw, I'm fairly new to automotive maintenance beyond oil change, coolant flush, plug wires, you know, simple stuff (Prior to my 7 I drove strictly hondas and toyotas, so little or no maintaining required) so exactly what do you mean when you say "put some lucas in there"?

 

my car did some weird hesitating at SLIGHT throttle, but fine after that. it was the TPS. set the TPS and see how that works. if it is not fixed, check the TPS with a voltmeter. if u dont know how to do either of this, search, or ask in this post

 

did you mess with the trailing wire's? if so try that because my car made some weird sputtering noises right after my dad went out there and i count find out what it was for a couple of days then i noticed the trailing wires (blue ones) were crossed

 

Throttle position sensor is set at 1v to the ecu and I check the ohms at idle and WOT on both sensors. I was thinking it may have a dead spot, but I want to exhaust my "free" options before I replace it.

I'm positive that the trailing wires are correct, trailing #1 top front, trailing #2 top rear. it idles fine untill I give it gentle throttle up to 1500, and thats where the "sticky spot" as I've named it, comes in (and just in case your wondering, no, neither my throttle cable nor my pedal is sticky.)




I appreciate all of the suggestions, and I'd like to hear more if you've got them. I really want to find out as much as I can about possible problems before I start shelling out cash to fix this issue.

 

oh here we go with the lucas enthusiasts..... it fixes any and everything! hah i use it with my cereal it's so good. IMO if you need lucas to fix your car, then there's probably a problem that you need to be dealing with other than prolonging it.

Anyways i would be betting on the tps but surely you should "exhaust" your other free options haha. I know for earlier models there's a ground wire mod you can do to prevent the hesitation although i don't think it applies for your 89 gtu. I'm sorry i couldn't be of much help, goodluck with finding the problem!

 

Thanks for clarifying the lucas thing, and thanks for your support mushy. I will update this thread when I locate the problem.

 

i would still swich them and see what it does. i was pretty positive myself too but it ended up being that

 

I would just buy a new one and try it, but they are like $300 new and $75 or so on e-bay, and personally I've never trusted used electrical components.

 

your a moron.

dont listen to this guy. if you know they are correct dont switch them. it could cause permanent damage.

if you dont have a volt meter then just screw the TPS inward little by little (test every adjustment). you should be able to fix it by doing that. make sure your throttle plates are opening correctly and there is no air leak on the intake.