Topic: 22RE surging around 1500-2000 rpms.

[SQUIRREL MONSTER]

so, i finished assembling the truck and runs nice and smooth at idle. when cold.... i can run it up in the rpms and it runs great, but, when it gets warm (operating temp) i cant get it to run smooth above idle 13, 14, - 2000 rpms  if i hold the throttle steady it will surge at those speeds. once i let off, it returns to a smooth idle. i think it may be a crossed vacume hose?? but ive checked em and they all seem to be in the right place. the only thing i have changed was the temp sender near the center of the intake manifold for a auto meter unit. that and the sensor connector on top of the water outlet has broke so its not connected.

any ideas???

i have a buddy with a fsm book but he's still an hour away... trying to sort things out or get an idea of what to look into before he gets here.

[SQUIRREL MONSTER [OP]]

also.... wich plug is the plug i need to short out to check timing?

[86bobbedtoy]

T and E         My gues would be your t.p.s. (throttle position sensor) goodluck

[SQUIRREL MONSTER [OP]]

ok, so here's what i found. i disconnected the TPS and it runs perfect... why? i still dont know. but i drove it around the block without any hesitations nor any of the surging it had. ran up to 4000 no sweat so i beleive its either a bad TPS or bad signal coming from somewhere.

[SQUIRREL MONSTER [OP]]

well, i tested the TPS and it looks like it just whent bad. read something crazt like 60-80 ohms gonna go buy one tomorra and see what happens.

[86bobbedtoy]

good luck a tps for my old 1989 toyota mr2 was like 390.00 I hope yours is cheaper.

[kneedownnate]

BUY YOUR TPS FROM TOYOTA!  Vatozone wanted $178 for theirs, toyota was about half.  Not saying you did it wrong, but are you totally sure on the reading for your tps?  You might try taking it with you and see if they'd be nice enough to check it for you.

[SQUIRREL MONSTER [OP]]

86 bbt- they didnt spare you the ky on that one did they? 

yea, did it by the book with the feeler gauges between the throttle stops and thats what it read. on top of wich, when i took the TPS off, i could spin the rotor and it'd get stuck and bind... its an original toyota one so its got its share of 308k+ miles on it.

 i checked vato zone for it... they now want 74 bux for one. so thats not too bad... tho you have a point, ill check toyota tomorrow. checked lcengineering wants 112 bux for theirs. if anything i can go get a good one from my buddy at the toyota yard. ill just take the meter with me and check em.

[kneedownnate]

If you don't find one and you're not in a hurry, check the sticky in general for a discount on factory toyota parts and my brother will hook you up

[Tallchevy]

What year is your truck  I have found that even though 22RE's look the same, the sensors aren't  I have an 87 & dropped in an RE from an 85. Used a 87 harness with the 85 ECU & found that the timing was 30deg off but ran excellent. I couldn't time the engine due to the harness is different. I put an 86/87 ECU & was able to get the timing closer but not good enough to pass smog here in Cali. I then swapped out the throtlte body for the 87 with the 87 TPS & got the timing perfect. I just smogged it last week. Basically 85 ECU & harness is different from 86 & up. 86 & 87 use the same ECU so I would assume that everything else for those 2 years are the same. 88 ECU is different than the prior years. Thats as far as I got in doing research on injectors, TPS & ECU's. I hope this helps you so you don't go through what I did   

[SQUIRREL MONSTER [OP]]

kneedownnate, the local dealer wanted $111.. ill see what your bro wants for one. thanks for lookin out!

tallchevy, its an 87 4Runner. the truck is pretty much compleatly stock. thats weird, ike you said, the sensors look just about the same but i guess they may have diffrent resistance numbers between em or something? 30degrees off is a hell of alot! i could imagine that it'd make it run REAL good

[Tallchevy]

It ran fine. The engine came right out of an 85 Runner & put it in my 87. The 87 was missing the ECU so I had to use the 85 thinking it would be good. When you short the T&E to set the timing, thats when I found out that it was 30deg off. I changed the ECU & the timing got closer, then changed the TPS & solved the problem. I have the 87 injectors but I'm running the 85's. The injector part #'s are different so there is a difference between them but I don't know. I heard it's the impedance in the injector coil but I'm not sure.

[SQUIRREL MONSTER [OP]]

yea, ive been looking around and it seems every year of the EFI stuff was just a tiny bit diffrent. especially when i got to see the vacume, sensor, injector and throttle body diagrams.

i ended up going through one of my connections leading me to buy a toyota OE TPS for 80 bux and now the truck runs as bitchin as ever. 

one question tho, on the 87's, where is the connector i have to short to check my timing?? i looked at the book i had and the diagnostic plug on the pass side fender and was diffrent. so... where or wich plug is the one i have to short?? once i find it, how do i short it? use a jump wire from one to the other, or a paperclip or what 

[Tallchevy]

It's on the passenger side fender. There is a cap that read "diagnositc". Open the cap & the connection is there. On the bottom side of the hood on the sticker that shows timing, there is a pic of the 2 terminals that you short together. A paper clip works fine. The check engine light will flash as soon as you turn on the key 

[SQUIRREL MONSTER [OP]]

cool, that it then? just short those and check it.. cool thanks!