tps is there2 on the s5 motor do you need both
09-28-09 | 01:36 PM
#1
tps is there2 on the s5 motor do you need both
i have a 86 with a 91 motor the engine is wired up using the s4 harness and one tps sensor is conected but the other one isnot its also runing a s4 afm car starts uo runs for a second or 2 and dies can these things be a problem?
09-28-09 | 01:39 PM
#2
The S5 ecu requires both but the S4 ecu does not. In your case you only need 1 of them but it has to be the correct one. The easiest thing to do is use an S4 tps or throttlebody if you have one. Otherwise you'll have to modify the plug on the S5 unit. One of them is full range meaning it moves all the way in and out as the throttle is rotated. The other one is narrow range which means that it is all the way out when the throttle is about 20% open or so. That's the one you want.
10-05-09 | 10:26 PM
#4
HAILERS
Joined: May 2001
Posts: 20,563
Likes: 23
From: FORT WORTH, TEXAS,USA
You can see if the previous owner wired the TPS right or not. FUlly heat up the engine.
Then go to the ECU and backprobe pin 2G (green/red) wire. It should be approx 1vdc. Then watch the volage as you depress the pedal. Voltage will go up/down as you press/release the pedal. PROVING the TPS is connected up right.
That said, the TPS can be in the backyard and the engine should start up and run. Ain't your problem imho.
IF the previous owner made the TPS connector where it can be disconnected.............then disconnect the thing and start the car. IF it now stays runing.......................you know what it is.
Is the elect plug connected to the AFM? Needs to be so since the fuel pump is dependent on the micro switch inside the AFM to *make* once the engine gets started. Prior to that switch making, the pump depends on the key being HELD to Start to keep the pump running.
IF the AFM plug is on the afm, then jumper the small two socket fuel pump check connector near the afm/boost sensor area. That will keep the fuel pump running even if the mico switch inside the afm does not *make*. Give that a try.
Large *** air leaks can cause just a momentary start of the engine. Then it dies because of too much air and not enough gasoline.
Then go to the ECU and backprobe pin 2G (green/red) wire. It should be approx 1vdc. Then watch the volage as you depress the pedal. Voltage will go up/down as you press/release the pedal. PROVING the TPS is connected up right.
That said, the TPS can be in the backyard and the engine should start up and run. Ain't your problem imho.
IF the previous owner made the TPS connector where it can be disconnected.............then disconnect the thing and start the car. IF it now stays runing.......................you know what it is.
Is the elect plug connected to the AFM? Needs to be so since the fuel pump is dependent on the micro switch inside the AFM to *make* once the engine gets started. Prior to that switch making, the pump depends on the key being HELD to Start to keep the pump running.
IF the AFM plug is on the afm, then jumper the small two socket fuel pump check connector near the afm/boost sensor area. That will keep the fuel pump running even if the mico switch inside the afm does not *make*. Give that a try.
Large *** air leaks can cause just a momentary start of the engine. Then it dies because of too much air and not enough gasoline.
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