TPS advantage ?

[stagefumer11]

Ive been noticing on light throttle crusing around town i get a low end miss and stumble all the time.. makes it horrid to drive.

 

Unpluging the TPS removes this. or even adjusting it either way doesnt help it at all. At the moment im not using it. No stumble no missing ect.

 

So.... the question is. What benifit do i have in using my tps at all ?. the only down side ive noticed is ive lost a little bit of down low torque. But the smoothnes makes up for that

[Guest bastaad525]

heh... I've been running w/o a TPS for the two years since I did my turbo swap. On top of that, on my last two EFI Z's (an '80 and '81 N/A ZX), I ended up running with the TPS' disconnected. With my current car, plugging in the TPS results in a lumpy idle, and a horrible stumble any time I go from idle to off idle. I've adjusted it perfectly with a voltmeter, and have tried four different used units. I'm not going to spring for a new one.

 

Car seems to run fine w/o it. This is a turbo so it only has two positions, idle and off idle, unlike N/A cars which also have a WOT position. As I understand it, the only thing the TPS does is provide extra enrichment at idle and WOT, at idle to run smoother (which it never has in my case) and at WOT for extra enrichment for power or what I dunno. I would imagine this would be the only real place you might have some disadvantage, maybe lose some top end power or maybe run too lean and detonate?? But I've never had this happen or heard of it happening, I dont think it runs THAT lean. I know it also has some effect on ignition timing on the turbo cars.

 

Oh and by the way I know there are a couple other guys here who also run w/o it. So bottom line, I say, don't worry about it.

[stagefumer11]

Ah so i can run without it. Ive been running without it for a few days, and its alot smoother. Nor do i run my 02 sensor, that just seems to bog it down alot. Seems to have the same problems yours does.

 

 

Ive noticed now. Im running 11psi. And its been running fine for a few days. apart from the clutch not always holding up . But now. after saturday night. I gave it a hard run in 2nd and 3rd. at 5000rpm in seccond the whole car cut out. A/f still showing ritch. Then after that it will miss a little bit while boosting hard. Quite anoying. Last night, samething again, in 2nd gear. no miss but the a/f went megga lean off the guage. 3rd gear it missed again.

 

Now i know the a/f guages are the most presise unit to run off. but im sure its alarming if it goes off the guage.

[Guest bastaad525]

yep thought I'd mentioned... I also run with my O2 disconnected. And I had to run my '81 ZX like that as well.

 

It's really odd that this problem seems so common. I gave up trying to figure it out. I actually went and bought an O2 sensor straight from Nissan just to be sure it wasn't issues with a crappy Auto Zone sensor. But it did not solve the problem. With the O2 plugged in, the car runs like crap, and starts smoking from the exhaust. Very odd. Runs great w/o it though, though I imagine it's partially to blame for my only getting 17-19 miles per gallon.