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Location:
New Zealand
Registered:
May 2002
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2TGEU TPS? problems
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Thu, 13 June 2002 07:07
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Okay, I transplanted a 2TGEU into my KE35.
I tried to run the fuel like this:
Tank -> fuel filter -> surge -> HPHV -> inj rail.
It didn't work, ran for about 8kms, then died. obviously out of fuel.
So, today I bought a LPHV pump from Appco and fitted that up.
Now there's heaps of fuel in surge tank, and in the rail as well.
However, now when the throttle is open a certain amount, it stalls.
If you slowly increase the throttle, revs increase, but as soon as it
gets to a certain point, it stalls.
I'm thinking it must be the TPS. If AFM, it wouldn't rev surely?
Anyways, I have a spare TPS, and spare AFM. Anyone got any ideas
first?
Thanks
Karl
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Club President
I supported Toymods
Location:
Sydney
Registered:
May 2002
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Re: 2TGEU TPS? problems
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Thu, 13 June 2002 09:12
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Karl, EFI and I are not very well aquainted but if I had to guess I'd say its flooding ! Check your Fuel pressure regulator out on the end of the Fuel rail !
No idea how to test it tho  Sorry not much use on this one.
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Location:
New Zealand
Registered:
May 2002
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Re: 2TGEU TPS? problems
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Thu, 13 June 2002 09:20
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hmm, thanks for your advice. somone on classic-celica board suggested the same thing.
Motor hasn't been run in a year since i put it in, but ran fine for the 8kms or so on the surge tank.
Maybe fuel regulator has rusted up?
I've tried disconnecting the Low Pressure pump, but to no avail.
Karl
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Toymods Board Member
Location:
Sydney
Registered:
September 2002
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Location:
New Zealand
Registered:
May 2002
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Re: 2TGEU TPS? problems
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Thu, 13 June 2002 10:05
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Okay, I'll check TPS tomorrow.
I have 3 different computers, will test all.
I have 2 afms, will test both.
I have 2 TPS, will check lastly, as looks like a bugger to change.
Thanks for your help guys, keep the ideas coming.
Karl
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Location:
Western Sydney
Registered:
May 2002
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Re: 2TGEU TPS? problems
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Thu, 13 June 2002 10:19
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Sounds like your TPS has been wired arse about. So when you go full throttle, the ecu thinks it's idling and cuts fuel. Swap the PSW and IDL terminal around and see if it fixes the problem. Or as Joe says, just unplug the TPS.
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Location:
New Zealand
Registered:
May 2002
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Re: 2TGEU TPS? problems
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Thu, 13 June 2002 10:41
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Okay, a little more info provided here.
I powered the LP fuel pump off the fat blue wire that normally runs into the fuel control relay. This relay would normally be switched by the computer, and control the HP pump in the main tank.
Instead, I've wired it up (for convience) so that the HP pump (sucking from surge) is powered the same as the computer.
This is by an ignition switched relay.
I have taped into this relay feed to power the blue rail for the LP pump as well.
So. relay takes power from batt, then sends off to HP, LP, ecu. It is a 30A relay.
Anyways, on the advice of Sean, I unplugged the TPS. And it runs fine!.
So.. I wonder if the fat blue wire for fuel control relay also runs to the blue wire in the tps?
I tried a continuty (resistance) check and there was great resistance, or no direct connection anyways. So maybe just by chance my TPS has died.
Would opening the throttle by hand and letting it snap shut cos damage to the TPS?
Karl
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Location:
Western Sydney
Registered:
May 2002
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Re: 2TGEU TPS? problems
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Thu, 13 June 2002 10:59
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Playing with the throttle won't damage the TPS. The three terminals on the TPS will be IDL(idle), PSW(full throttle) and a power source. Your TPS is obviously getting power because your prob is sorted when you unplug it. When I wired my 18R-G up, I connected the TPS the wrong way around and had exactly the same problem as you. If you've got a diagram, use it to find the IDL and PSW wires. They should be the two outside pins on the TPS. Remove the pins and swap them around or just chop them and solder them the other way around. 90% guarantee this will fix your problem. If there are a few different ECUs for the 2TG, then maybe the ECU pin layouts are slightly different causing your TPS to be wired the wrong way around.
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Location:
New Zealand
Registered:
May 2002
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Location:
Tasmania
Registered:
May 2002
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Re: 2TGEU TPS? problems
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Thu, 13 June 2002 15:03
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Asuming the TPS is wired correctly, that is not the problem. I think your fuel system is a bit dodge. Read some ore about surge tanks and fuel pumps, and try and get the order right.
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Location:
Tasmania
Registered:
May 2002
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Re: 2TGEU TPS? problems
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Thu, 13 June 2002 15:05
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it went only 8km because that is how much fuel was in the surge tank, then the pump could not suck any more. Get your pumps sorted out, with a return line from the pressure regulator.
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Location:
New Zealand
Registered:
May 2002
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Re: 2TGEU TPS? problems
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Thu, 13 June 2002 19:32
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yes, exactly Jonny.
The fuel regulator returns into the surge tank.
Karl
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Location:
New Zealand
Registered:
May 2002
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Re: 2TGEU TPS? problems
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Fri, 14 June 2002 06:36
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Okay, next problem.
The car is retarded quite a bit, yet it still pings. after about 2250rpm.
The vacuum advance is plugged up.
The coil is fine, leads are fine, rotor is fine, plugs a little dark.
I'm going to try my spare dizzy tomorrow, as I know this is sweet as it worked fine with the 2TGEU.
I'll check spark plugs as well. But it seems there is a gremlin in the computer setup.
It's started doing this since something about the TPS stuffed up.
One of my computers which used to work, now won't start the car too.
Also, will having the water temp sensor for the computer unplugged affect the mixtures by much? rich? lean?
I am going to wire up the cold start injector with a potentionmeter so I can use it as a manual choke/extra 50cc(?) injector. My water housing doesn't have provision for the water temp plug.
Karl
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