Romans117

Motor surges and stumbles above an idle. Timing is dead on. TPS is new and set to spec. Air Flow Meter does not appear to open with acceleration. Disconnected the TPS and it runs with a high idle but can be driven pretty darn well. Not hesitation whatsoever. What are the consequences of driving without the tps connected?

Yes I did search the archives. No resolution for the issue I describe.

abecedarian

okay, I'll bite.
And that doesn't strike you as odd?
Disable the closed loop mode of the ECU and I'm sure it'll run rather well.
No you didn't.

Romans117

Care to explain the closed loop deal?

I have been reading pages and pages of tps and afm search pages.

Romans117

Anybody?

mightymouse

iTrader: (6)

sounds like the AFM to me. if it doesn'open during accelleration that's your problem. Check out 4crawler's page it'll give you some guidance. I had similar issues and fixed them by replacing the AFM. Do a quick search on here for AFM or MAF (it's referred to as both) and see if you symptoms match.

Romans117

I re spec'ed and cannot getting any reading on wide open throttle. On .85 and .57 I cannot get any lower than .08 on the digital meter set at 20k. It is .08 pretty much throughout the full range of movement. The highest being .14. The reading at 0.000 is good. vccc to e2 is good. I am beginning to think the new tps I have is jacked up.

Any harm in running the truck with tps not connected? I have run it down the road with no obvious problems or codes at all.

1990yota-pickup

just to be one the safe side.. check your fuel pressure before the fuel filter and after the fuel filter.. if nesscary replace your fuel filter.. wont hurt the wallet more than a few dollars..

Romans117

I pulled the tps off and compared the tps with the orginal I took off and it is not the same tps. The part number on the box is the right number. When compared to each other the new tps inner tabs do not mirror the tabs in the old tps. I am talking about the inside tabs that the throttle pins rest on. My truck was manufactured in 5/1989 and calls for the tps made after 3/1989 not the tps made through 2/1989. My guess is the 2/1989 tps was put in the 3/1989 tps box. Will keep the post updated.

1990yota-pickup

take that tps back then..

Romans117

I took the tps back today and compared the tps I have which is for the 22re manufatured after 3-89. My truck was built in 5-89. The picture of the tps manufactured to 2-89 matches the tps I have on the truck. Anybody intimately involved in the trade know about the tps change dates.

I ordered one from the dealer using my vin number. Suppose to be here tomorrow a.m. I have a feeling the tps will not match the one I have.

Romans117

The TPS that I took off the truck is from an 1989 Celica. So the question is is the tps interchangable with the truck throttle body or does my truck have the Celica throttle body on it. I have ordered parts before for the throttle body and the parts diagrahm showed correctly the throttle body.

Question 1
Are the throttle bodies for the 89 Celcia and 89 pick-up interchangable ?

Question 2
Will a Celcia TPS work correctly with a truck ECU?

Question 3
Is this a mod that provides something special for the pick-up?

1990yota-pickup

i am not sure but, it wouldnt supprise me that toyota would want to keep as much interchanbilty up, to keep prices down.. the last year for the 22r/22re in the celica was 1985.. check out tech notes ... and school up on some yota history

http://www.toysport.com/technical%20...tech_notes.htm

Romans117

No mention of what I asked.

Romans117

Anybody?

Junkers88

So the TPS is from an 89 Celica. Do you know what engine was in the Ceilica that the TPS came out of? If Toyota stopped putting the 22 series engines in the Celica in 1985 then you might have the wrong TPS.

1990yota-pickup

junkers i see, that you understand what i wrote...

Junkers88

I'm glad I got that right, I was a little lost and had to reread the thread a few times.

Ok so did you find out what engine the TPS came off of? I don't have a lot of knowledge on the Celica frame but I do know a 22re a little and may be able to help.

worshipmentor

iTrader: (3)

ok, I see all this post and i go, WOW sounds like my issue, the same only different! 87 22re that worked fine BEFORE a tear down, head gasket, 18yro pressure-washing the throttle body (w/TPS still on it) and mine now does the same thing. Idle is ok with TPS hooked up but anything over that throttle position is nothing but an excersize in loading the garage with unburned dinosaurs and RPM rises and falls. The AFM never opens (causing the surge is guess). HOWEVER....when I disconnect the TPS it works great! Hmmmmm maybe I should leave it off, disconnect the EGR, plug it all off and DRIVE IT!!!!!!

1990yota-pickup

just fix it, it will be a worthy cause..

worshipmentor

iTrader: (3)

Great idea 1990yota............................HOW DO YOU SUGGEST I DO THAT???????I read about issues with the IAC but I don't see how that could effect this problem. "I've beat my head against so many walls I'm falling down, falling on my knees"