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Discussion Starter · #1 ·
85 Supra
5M-GE


Last week it was very cold and rainy here. My car started acting up. At
first it would randomly drop RPMs and wouldn't speed up no matter how much i
mashed the gas. It then became more severe and wouldn't leave first gear
until i pressed the gas to the floor for a couple of minutes. You'd hear
the exhaust bout ready to blow up. I took it to a shop and they said it was
the AFM or the fuel pump. I replaced the fuel pump (found metal shavings in
the old one) and still the problem. Replaced the AFM (3 times!!) and STILL
the problem. The car runs really rich. You see black smoke and it idles
really hard. It dies at stop signs or when slowing down. It seems to idle
fine when the engine is cold but once it heats up, problems rise. Anymore
ideas? My last thought is the O2 sensor.

edit] forgot, i also did the fuel filter before taking it to the mechanic.
 

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Discussion Starter · #3 ·
yup, of course. codes have been pulled. can't remember what they were =/ i can go ask my neighbor tomorrow, he did some work on it (he's a mobile mechanic).
 

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It sounds like the cold start injector is hanging open. Take a pair of vice grips and pinch the hose shut after it's warmed up. If the problem goes away or gets better let us know. Your cs injector time switch maybe messed up, or the injector may be stuck open. Have you checked the resistance on the ECU temp sensor??
Jamie
 

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where is the cold start switch located? cuz im having problems with my cold start and i need help.
 

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Cold Start Thermal Time Switch is one of the small plugs that's attached to the thermostat housing. Can't remember the specific one.

If your Time Switch is crapping out, the motor will just barely start, will try to idle at ~400 rpms for about 2 - 3 seconds, then it will go into fast idle. Is it doing this??
 

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Discussion Starter · #7 ·
will try all of these tomorrow morning, it's too late now :p

please keep the suggestions coming. he checked the voltages to the ecu and such and he said they were alright *shrugs*
 

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CJSREDPRA said:
Cold Start Thermal Time Switch is one of the small plugs that's attached to the thermostat housing. Can't remember the specific one.

If your Time Switch is crapping out, the motor will just barely start, will try to idle at ~400 rpms for about 2 - 3 seconds, then it will go into fast idle. Is it doing this??
I just took off my old intake manifold to learn the switches and 2 COLD START INJECTOR SWITCHes and wires. One on the thermostat housing is the left one w/a BLACK STA wire and a green STJ wire, the green wire follows to the other CSIswitch.
 

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On your intake manifold????

Does not make sense!!!!!!

The thermal time switch is basically a probe that sticks itself into the coolant passage near the thermostat & measures the coolant temperature. If the coolant is warm, than bypass the coldstart injector that is inside the throttle body. If it's cold, then engage the coldstart injector.

The intake manifold does NOT have any coolant passages in it!!! Something's amiss here.
 

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you're right

You're right, you caught me off guard. MY bad, I get it now. I was just saying I took off the intake manifold from an old engine to get abetter look at the wire colors, from the START INJECTOR TIME SWITCH connecting wires to the COLD START INJECTOR.

But I had to tear open the whole harness to do some figurin out for my swap. Just letn ya know about the COLD START INJECTOR TIME SWITCH and if its the same as CHRIS said above, the COLD START THERMAL TIME SWITCH then its the left one on the thermostat housing.

I confused myself, sorry, just trying to help. :lol:
 

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and about the 02 sensor don't even think it. the o2 sensor can't throw off the ecu that much. it notices an o2 sensor that is reading rich ALOT annd stops using it and goes to a predetermined fuel map(which is rich) maybe your fpr went out?
 
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