TeamSwift

My car has a tendency to surge when stuck in stop and go traffic. The transition on/off throttle is very abrupt especially in colder weather.

I can't find any other cause in the manual but I think it might be a slightly misadjusted TPS. It's like the off throttle fuel cut is engaging too soon.

I can't find the instructions for adjusting the TPS in the manual or on the board.

I also couldn't find any rich/lean finetune adjust in the manual. How could I miss that? It's got to be there somewhere.

It's a 92 GTi.

Any help?

ed

THROTTLE POSITION SENSOR:ADJUSTMENTS

Throttle stop screw is factory preset, do not remove or adjust.

1.Disconnect battery ground cable, then tps coupler.
2.Loosen TPS screws.
3.Unsert .025inch thickness gauge between throttle stop screw and throttle lever.
4.Connect ohmmeter between C and D terminals of TPS connector.A- -D
B- -C
5.Turn TPS clockwise fully, then counter clockwise gradually to find position where ohmmeter reading changes from zero to infinite.Tighten TPS at that position.
6.Ensure there is no continuity between terminal C and D when .035inch thickness guage is inserted between stop screw and throttle lever.
7.Ensure there is continuity between terminal C and D when .012inch thickness guage is inserted between stop screw and throttle lever.
8.If checks in step 6 and 7 are not as specified, installation angle of TPS is not adjusted properly.Repeat complete procedure.
9.Connect coupler to TPS and battery ground cable.

That'S about it

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1993 boosted Suzuki Swift GT

Thanks.

It's a little more work than I was hoping for, especially after reading the other message saying how hard it is do remove the TPS connector. (not too horrible, just inconvenient in this cold weather)

I sure hope the previous owner didn't move the throttle stop.

That certainly sounded like instructions from the manual but I couldn't find them in mine. What section did did they come from?

ed

looks like service manual stuff... not glove box manual

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i got it from MITCHELL on-online demand from where i work.you can every information you want on any car you want.

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1993 boosted Suzuki Swift GT

I ordered the 91 service manual and the 92 update. I got the 92 update and then they couldn't get the 91 manual so they swapped the 93 manual.

I've looked through the GT Fuel Injection section but it doesn't have any TPS adjustment instructions. It's pretty good about describing what happens but not about any adjustments.

The info is in another section maybe?

ed

Finally found it. I found the first two mentions of the TPS in the service manual but missed the third one way back on page 6E1-84.

Still haven't found any fuel mixture adjustment. Is there one?

ed

o.k. not to sound like a idiot,but for the tps adj.you say "zero to infinity"?where it changes from a fluctuating 1.3 etc to 0.00 k,m.i have a nissan t.b.and i am having a hard time following and adjusting this.it fluctuates and the only way i can get it i guess "zeroed"out it to manually move the tps arm farther away from the t.b. swing arm.Maybe i am just doing this wrong and the terminals as marked are based with the release lever on top of the plug?

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"One Of Three ORIGINAL (CERTIFIED) LNLC Co-Founders"
1991 Suzuki Swift GT.
1994 Suzuki Swift GT.
If my Swift was as fast as Tg or m's car I'd be famous...
My car is a trailer queen 'cause it's too slow to merge safely into traffic

I haven't tried yet to adjust but I don't think it will be easy. You can try to rotate the TPS slowly but the nature of friction will make the transition from on to off very jumpy.

On top of that the natural vibration of a running engine makes the transition happen in a slightly different place. The vibration acts as sort of a lubricant.

Most ECU's that use an idle switch use it for the "throttle off fuel cut". I think that if you have it adjusted too high then the car will surge on and off whenever the throttle is almost closed and if the TPS is too low then the car will probably not slow down quite as fast as you like and probably get slightly worse MPG.

I think a TPS adjusted correctly or slightly too low is the best way to go.

Any different opinions?

ed

yes the terminals are based with the release lever on top of the plug.And forget the ''zero'' just move till you have the ''INFINITE'', this is the important part.I did it that way and my car is running just fine.

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1993 boosted Suzuki Swift GT

o.k. messing around with it more i found out that i have to move the tps arm on the tb 1-2mm more to get it to read infinte.Have you guys that are running nissan t.b. run into that problem that the tps arm wont get it to infinte?again,maybe it is just me,hey thanks Kram for posting a reply

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"One Of Three ORIGINAL (CERTIFIED) LNLC Co-Founders"
1991 Suzuki Swift GT.
1994 Suzuki Swift GT.
If my Swift was as fast as Tg or m's car I'd be famous...
My car is a trailer queen 'cause it's too slow to merge safely into traffic

no problem

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1993 boosted Suzuki Swift GT

My Suzuki Swift 1.3 GLS used to run at 800rpm but sounded as though the idle was a bit high - anyway, I adjusted the tapets recently and since then the car (when it's warmed up) is at the brink of stalling (though it doesn't).

I then added redex injector cleaner to the fuel (as you you this can increase the revs) and now it's surging every time it hits 800rpm whilst stopped. It revs up then falls back to the 800rpm point and so on.

Any one any ideas

I later found out that the surging was from the earth terminal not grounded properly. Had some rust on it, I cleaned it up and the surging stopped.

I learn something new every day in this global environment, I always called the "earth" terminal the "ground" terminal. Guess that's just the difference between us americans and the English.

I also heard the distributor called a "dispenser" by some one in the Netherlands I believe it was

Interesting world we live in.

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I can guarantee you one thing, if you apply enough force ......Somethings gotta give!

can somebody illustrate this?
i am having the same problems here with the winter cold. when starting the engine allways dies once, then i have to wait about 20 sec before starting it again(else it wont fire up), and it will run just fine.
so i want to try to ajust the tps, but the section with the terminals is not clear to me.

4.Connect ohmmeter between C and D terminals of TPS connector.A- -D
B- -C

hope someone has a picture of what pins to connect to the ohm meter. and maybe a picture of where the TPS is located.

with the release lever on top of the connector.

A- -D
B- -C

so the ohm meter goes on D and C the 2 on the right of the connector.

i don't have a picture of the tps...but it is hard to miss it...it is on the back of the TB that is on the intake.2 screws are holding it.If you loosen the 2 screws you will be able to move it.

hope that help!

maybe someone has a picture?

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1993 boosted Suzuki Swift GT

This should help:


Other threads with TPS calibration info:
TPS and idle speed adjustment
TPS tech, code 21 & 22 diagnostic
TPS calibration diagram
surging - TPS adjust--FAQ (oops, that's this thread)

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Is the procedure the same for 3 cyl engines? I searched and found nothing indicating either way.

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i don't know much about 3 cyl...but i doubt it is the same.Maybe someone else can help you.

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1993 boosted Suzuki Swift GT

Instead of waiting 20 seconds, try putting the gas pedal to the floor. That is flood clear mode, no gas will be injected. Then lift your foot and the car should start.

ed

Good question, Stupidicus!

The difference in TPS is not 3 versus 4cylinder, its 5-wire versus 3-wire TPS.

Lihtan's schematic further up is for the common 5-wire TPS, however the 3-wire is altogether different.
If its a 3-wire TPS look in"FAQ's & How-To's" "How to adjust 3-wire TPS"
Helmut.

Makes sense.
Thank you, and +Karma for you.

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