3S-GE revving problem, no more than 4200 rpm, SOLVED 12.12

Dear celica fanatics

I have -88 ST162 with 3S-GE. Stock engine with maf.
Problem is that it won´t rev more than 4200 rpm, with or without load. It cuts rev quick and same time it flickers engine warning light. Otherwise warning light won´t work. When I turn ignition on it should light, but it won´t.

Things that I have changed so far, with no result at all. Distributor, igniter, ignition coil, afm and ECU. Every time same result. With slow acceleration with no load it goes to 4200 rpm, engine warning light flashes, rpm drops to 3800, then it goes up to 4200, light, 3800, 4200, light, 3800 etc...

I have took instrument panel out of it (speedo, tach, etc.) because of cleaning. Is it possible that something there, tacho, wiring etc. would cause something like this? I´ll have to break it down and check.
T-VIS should go on approx in those rpm´s, is it possible to do something unexpected when it opens butterflies? I don´t believe that unopening the T-VIS would do so dramatic effect

If someone have any ideas, those would be greatly appreciated. Any kind, it would help to investigate new areas, which haven´t come to my mind yet.'

Thank you.

 

Re: 3S-GE revving problem, no more than 4200 rpm

- Yes, AFM.
- I´ll have to check those ground points, that may cause that kind of symptoms.
- I don´t think it´s fueling problem, because it´s so sharp. But have to check those also. I haven´t drove it after that problem started. It´s snowing out there and I don´t want to take it out of the garage, before it seems to be ok.

It have turbo, but there is no difference, if the AFM is straight before intake manifold or before turbo. Same symptoms natural aspirated and charged. And it won´t do any pressure without load under 4200rpm anyway.

I´m getting ST162 official toyota manual today, so I can read engine fail codes and understand those if any found.

Now I only have to wait my dayjob ends and I can go to continue more important things

Is rev limiter ignition or fuel cut? Fuel cut I assume.

 

Re: 3S-GE revving problem, no more than 4200 rpm

I´ll try to post video clip tonight, if I can´t sort it out. I think it´s something small, because all the parts I have tried and still same thing at same point and sharp and sudden death. And no matter what you do, it won´t go over that point, so it sounds like a "safety mode", go to local toyota dealer it says

 

Re: 3S-GE revving problem, no more than 4200 rpm

now I finally maneged to get those diagnose codes out of the system. Engine had to be running, before it gave codes. Two codes found, numbers 24 and 43. Intake air temp sensor and starter signal problems.
Didn´t have enough time to check those areas, but mayby tomorrow I´ll get those checked. I took crappy video of tacho while doing what it does best
http://www.youtube.com/watch?v=XOUNSm7M ... re=related

 

Re: 3S-GE revving problem, no more than 4200 rpm

vacuum at idle is almost 0.8 bar. I don´t want to warm it, because it´s in a garage. I have run it to fan operating temperature twice, but same problem still.
It runs very nice 800 rpm idle when warm, otherwise it seems to be ok. When I get those two failcodes fixed and cleared I hope it will be better.

It worked fine about 1.5 month ago. Then I decided to install ST165 exhaust manifold and CT26 turbo, which were laying around my garage. After I found out that turbo is hitting to starter motor, I changed transmission and starter from Camry to avoid that problem. It have front intercooler. First I thought it might have something to do with turbo installation. But I have tried to put AFM back to it´s original place and turbo have been blowing to atmosphere. Same symptoms, so it´s not because of extra air nor intake pipe leaking between AFM and intake.

I changed spark plugs today, old weren´t old either, but just to check that area also. It really seems and sounds like ignition problem, because it´s starts to waken turbo up, like unburnt fuel is burning in turbo housing. Of course it may retard ignition and thats why it´s burning the fuel in turbo.

Does it have a ignition based rev limiter or only a fuel cut system?
Will it go to safe mode just because of those to codes it have?

Well after good night sleep, car related dreams and visions, I´ll be smarter tomorrow.

Or I´ll just make a intake for Weber 32/34 DMTT and take a distributor from 2T engine and just :auto with it ever after :lachtot

 

Re: 3S-GE revving problem, no more than 4200 rpm

oil pressure is ok, just connector loose from pressure sensor.

But the main reason for writing now, is that problem SOLVED.

First if you have problems with CEL, check what causes that, it´s clearly a message of something. Mine didn´t turn on when ignition turned on and it was difficult to get codes out.

I had a low voltage on ECU terminals B and B+. Should be battery voltage, when ignition on. I had only 6 volts, while battery had near 13V. I haven´t had time to check where is the problem for that. With a jumper cable from battery to ecu terminals B and B+, CEL started to work properly and now engine revs like a champ

Thanks for help and understanding

 

Re: 3S-GE revving problem, no more than 4200 rpm

it was challenging job, but not a major one. After I changed all the parts, which can do such an error, I thought it must be in car itself. In wiring or loose connectors etc. Glad I solved it. Now few fuel things have to be done and then heading to dyno.

Lets say that I´m very disappointed if I don´t beat the stock ST165 figures ST162 3S-GE have bigger comp ratio and better cams than ST165 3S-GTE. Lets see how my other mods will work...

It´s sad that we have winter already. FWD car is quite sad in snow :sad