2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

throttle pin position

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Old Mar 7, 2007 | 12:17 PM
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From: lawrence
throttle pin position

im not sure if that the correct name, but the pin on top of the engine that adjusts the throttle position, where is it supposed to be? i have it all the way tightened down and am gradually rotating it to open the throttle up in an attempt to get the car started.
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Old Mar 7, 2007 | 01:13 PM
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From: lawrence
no one knows?
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Old Mar 7, 2007 | 11:06 PM
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the screw that the throttle rests against is only supposed to be exposed a couple millimeters. why isnt the car starting? what is it doing and what have you done to it recently
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Old Mar 8, 2007 | 12:13 AM
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well i know for a fact the leading coil is bad so thats gettin replaced this weekend and my ecu is saying i need a new pressure(boost?) sensor. (i have an NA) and it tries to turn over so im thinking its just those two things. we changed the plugs and put some atf in for compression but i gotta check the compression tomorrow just to make sure.

last night we were working on it and it threw out a ridiculous amount of fuel from a backfire. im saying like a puddle underneath my exhaust and a spray about 20 feet long. from that i tihnk there was a carbon buildup or something else preventing the fuel from coming out. any thoughts?
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Old Mar 8, 2007 | 07:42 AM
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Originally Posted by comanche
well i know for a fact the leading coil is bad so thats gettin replaced this weekend and my ecu is saying i need a new pressure(boost?) sensor. (i have an NA) and it tries to turn over so im thinking its just those two things. we changed the plugs and put some atf in for compression but i gotta check the compression tomorrow just to make sure.

last night we were working on it and it threw out a ridiculous amount of fuel from a backfire. im saying like a puddle underneath my exhaust and a spray about 20 feet long. from that i tihnk there was a carbon buildup or something else preventing the fuel from coming out. any thoughts?
Sounds flooded. That's a serious amount of fuel...
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Old Mar 8, 2007 | 09:06 AM
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yea its definetly flooded and the throttle pin was pretty much all the way out, thats why i thought that maybe too much fuel is coming out of the injectors in the first place. i tightened it all the way down and am gradually moving it out until the car sounds like it likes it i guess. i have no idea where its supposed to be so im probly doing it wrong.
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Old Mar 8, 2007 | 11:12 AM
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1. The amount of fuel injected during START is not a function of the TPS/Throttle plate opening/AFM etc.

2. The ECU has a START fuel map. When the ECU sees less than 500rpm plus 12vdc on pin 3B and a water thermo sensor input, those are what determines the amount of fuel injected during START. UNLTIL the rpms get over 500 rpm and THEN the afm is used for fuel delivery.

3. It sounds like your car is flooded beyond the word SERIOUS.

4. Personally I'd disable the fuel pump all together and clear the engine of gas by pulling the lower plugs out and spinning for fifteen to twenty seconds with the starter. Then somehow put engine oil in the rotors and spin the engine again for about the same time.

5. Then use a spray of starter fluid in the air filter for about two to three seconds and then with the pedal all the way down start the car. Won't start for more than a few seconds, but repeat a couple of times. THEN reconnect the fuel pump and try once more.

6. Maybe pull start the car? Sounds deadly flooded.

I'll attach a jpg in a few minutes to clarify things a bit.
Attached Thumbnails throttle pin position-graph.jpg   throttle pin position-graph2.jpg  

Last edited by HAILERS; Mar 8, 2007 at 11:22 AM.
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Old Mar 8, 2007 | 02:59 PM
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wow. incredibly helpful guys thanks. im trying to buy a pressure sensor and the larger ignition coil assembly from someone(anyone lol) on here i just sent some pms out but i'll try the steps you gave me tomorrow when i have some time Hailers.
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Old Mar 8, 2007 | 06:51 PM
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The stock LEAD coil is good enough. Don't bother with the Trail coil assy. The engine will run fine even if the Trail is dead.

Odd the pressue sensor would be bad. Is the electrical plug on it? Is the vacuum line on it?

The output to the ECU from the pressure/boost sensor can be verified at the ECU with a digital meter backprobing the wire. I've no idea what series car you have.
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Old Mar 8, 2007 | 11:40 PM
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the car will run without functioning trail plugs (not 100% output). Make sure everything by the trail coil is plugged in.
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Old Mar 8, 2007 | 11:52 PM
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well just to be sure i just got both the sensor and the trailing coil with ignitor for very cheap. after this and a few more weeks of trying(hopefully it wont come to that), if it dont start then i have my eyes on a nice single turbo from tigerjapanese.com
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Old Mar 9, 2007 | 12:50 AM
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if you cant get an already installed engine to start, good luck on the engine swap starting.

if it is in fact flooded,

...unplug the fuel pump, but keep all the fuses plugged in.
...remove the spark plugs and clean them (use a lighter to burn any fuel off of them)
...turn the engine by hand a few times (rotate the power steering pulley with a wrench, makes it easier) you should hear some puffing noises.
...with the gas pedal all the way down. turn the key and let it turn for a few seconds, give it a minute or two break then turn it again, repeat a few times.
...coat the spark plugs with a thin layer of oil and tighten them down.
...connect fuel pump
...start car!

make sure all the connections are in order by the trailing plug.

The starter could be bad as well. get it tested. auto stores do it for free.

Last edited by NCross; Mar 9, 2007 at 01:06 AM.
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Old Mar 9, 2007 | 12:00 PM
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From: lawrence
well just to be sure i have the sensor and ignitoin assy comin in on mon or tues. i figure if the ecu says fix it, i fix it and i know that the coil isnt firing right. those two unflooding techniques will be implemented this weekend and then after i get to new parts installed. kepp you fingers crossed for me fellas
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Old Mar 11, 2007 | 03:49 PM
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ok well i tried all those procedures and nothin. i tried to compression check it but couldnt for the life of me get the checker hooked up. so it looks like the car is gettin towed to a shop id like to just work on it myself and learn about the car but with no knowledge except what i read, its quite frustrating.
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Old Mar 11, 2007 | 09:03 PM
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double check that the fuel rail vacuum line is plugged in. try push starting it.

unless its a rotary shop theyre most likely going to BS you and tell you its a blown motor.
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Old Mar 12, 2007 | 01:58 AM
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ill check all the lines i can this week, as well as cleaning all the plugs and such. it sucks because i got the beast started a week and a half ago and now nothing. boooooooo...and there arent any places i know around me (trenton NJ) that are rotary specific shops. jose (on here) knows a guy in camden that i may go to. gotta make up my mind fast tho my mom is gettin pissed lol
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