got a multimeter....need to know how to check electricals........any suggestions?
05-13-11, 04:05 PM
#1
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got a multimeter....need to know how to check electricals........any suggestions?
i need to know how to check the following and what they should be reading:
1991 s5 TII-
air flow meter
boost sensor
tps
omp
injectors
and anything else that could cause my car not to start or run very very very rich...thanks
1991 s5 TII-
air flow meter
boost sensor
tps
omp
injectors
and anything else that could cause my car not to start or run very very very rich...thanks
05-13-11, 06:45 PM
#5
Information Regurgitator
Get the FSM(Factory shop manual) it tells how to do all these checks and the proper values you should be reading. It is exspensive unless you can find the pdf's somewhere online, but it can be a lifesaver for the RX7 owner.
05-13-11, 06:50 PM
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05-14-11, 12:23 PM
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i can do without the smart *** comments guys. i know how to use a multimeter.
i know how to check the injectors, but the rest is not covered in the repair manuals. all it says is take it to a dealer. all i need to know is the specs. maybe somebody out there is KIND enough to help a FELLOW RX7 OWNER.
i know how to check the injectors, but the rest is not covered in the repair manuals. all it says is take it to a dealer. all i need to know is the specs. maybe somebody out there is KIND enough to help a FELLOW RX7 OWNER.
05-14-11, 01:52 PM
#9
It isn't our fault that you took on a task over your head and outside of your knowledge. You make a new thread every week about the same bullcrap and expect us to fix your car over the Internet. Everything you need is available on this website or linked from it, either you too dumb or lazy to find the resources yourself.
05-14-11, 05:17 PM
#11
Information Regurgitator
He is right the specs you seek are in the FSM. It is the manual the dealers use. Have you looked in the links in pfsantos's sig? Download those PDF's and look at them.
05-16-11, 05:36 PM
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ok, i checked everything out with a multimeter and everything checks out fine. \
what is happening is when i go out to start the car, it takes a while to get started. then it spits fuel smoke out the pipe and runs with my foot on the pedal. i can keep the car running at 1000 rpms with my foot on the pedal, if i take it off, it dies and is hard as hell to start again. when i get it running for the first time of the day, it runs kinda like it needs a tune up or something. it takes a couple of seconds to get some hp out of the car while driving it. i am getting boost anywhere over 3000 rpms and no less. once i let my foot off of the pedal, it will stall and wont start again unless i push start it and pop it in first gear then it runs the same as i described above.
could fuel pressure, air flow meter, or fuel pump solenoid resistor cause this to happen?
what is happening is when i go out to start the car, it takes a while to get started. then it spits fuel smoke out the pipe and runs with my foot on the pedal. i can keep the car running at 1000 rpms with my foot on the pedal, if i take it off, it dies and is hard as hell to start again. when i get it running for the first time of the day, it runs kinda like it needs a tune up or something. it takes a couple of seconds to get some hp out of the car while driving it. i am getting boost anywhere over 3000 rpms and no less. once i let my foot off of the pedal, it will stall and wont start again unless i push start it and pop it in first gear then it runs the same as i described above.
could fuel pressure, air flow meter, or fuel pump solenoid resistor cause this to happen?
05-16-11, 06:18 PM
#13
If it was the air flow meter, the car would just start, get to about 500 rpms then die. So I would say no go on that idea. Fuel pressure, maybe, get a pressure tester and find out. Fuel pump solenoid resistor, maybe, check it for proper resistance.
I would also check for vacuum leaks, and check that the water thermo sensor is connected properly (by properly I mean that BOTH pins are making good contact, not just the plastic piece hooked up.) I would also check the compression.
I would also check for vacuum leaks, and check that the water thermo sensor is connected properly (by properly I mean that BOTH pins are making good contact, not just the plastic piece hooked up.) I would also check the compression.
05-16-11, 08:17 PM
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If it was the air flow meter, the car would just start, get to about 500 rpms then die. So I would say no go on that idea. Fuel pressure, maybe, get a pressure tester and find out. Fuel pump solenoid resistor, maybe, check it for proper resistance.
I would also check for vacuum leaks, and check that the water thermo sensor is connected properly (by properly I mean that BOTH pins are making good contact, not just the plastic piece hooked up.) I would also check the compression.
I would also check for vacuum leaks, and check that the water thermo sensor is connected properly (by properly I mean that BOTH pins are making good contact, not just the plastic piece hooked up.) I would also check the compression.
05-17-11, 07:26 PM
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ecu is good. i have checked all of the electricals. that is why i think it might be a fuel issue. or my air flow meter is checking out alright, but it still could be off by a bit adjusting the fuel to rich at all times but still making it to where the car will still run.
05-17-11, 11:12 PM
#21
Thats going to give you a good idea as to what signals are actually making their way to and from the ECU, hence working properly.
1) Get physical access to the ECU. It's located in the passenger footwell behind a metal kickplate. You are going to have to remove some plastic around the bottom of the door and the foot to do so, then peel the carpet back.
2) Remove the kickplate, and voila, there is your ECU.
3) Now grab the Fuel and Emissions section of the Factory Service Manual, get to the part of that section that talks about the Emissions Control Unit. You should find a list there that says what each pin is, whether or not it is an output/input, and what voltage it should be showing and when.
4) Also listed is a diagram saying which pin is which. Find the pins for the TPS, the AFM, the injectors, the boost sensor, the coil packs, the water thermo sensor, the crank angle position sensor, fuel pump resistor.... anything vital to the starting and running of the car.
5) turn the ignition to "on"..... do not start it, but turn it to "on" so that everything has power.
6) "backprobe" meaning insert the probe of the multimeter into the rear of the pin, while the big plugs are still connected to the ECU. Compare the voltage you read there to the values given in the FSM. To gain access to some of the pins, you may have to completely unbolt the ECU so you can maneuver it easier.
1) Get physical access to the ECU. It's located in the passenger footwell behind a metal kickplate. You are going to have to remove some plastic around the bottom of the door and the foot to do so, then peel the carpet back.
2) Remove the kickplate, and voila, there is your ECU.
3) Now grab the Fuel and Emissions section of the Factory Service Manual, get to the part of that section that talks about the Emissions Control Unit. You should find a list there that says what each pin is, whether or not it is an output/input, and what voltage it should be showing and when.
4) Also listed is a diagram saying which pin is which. Find the pins for the TPS, the AFM, the injectors, the boost sensor, the coil packs, the water thermo sensor, the crank angle position sensor, fuel pump resistor.... anything vital to the starting and running of the car.
5) turn the ignition to "on"..... do not start it, but turn it to "on" so that everything has power.
6) "backprobe" meaning insert the probe of the multimeter into the rear of the pin, while the big plugs are still connected to the ECU. Compare the voltage you read there to the values given in the FSM. To gain access to some of the pins, you may have to completely unbolt the ECU so you can maneuver it easier.
05-18-11, 03:59 PM
#22
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Thats going to give you a good idea as to what signals are actually making their way to and from the ECU, hence working properly.
1) Get physical access to the ECU. It's located in the passenger footwell behind a metal kickplate. You are going to have to remove some plastic around the bottom of the door and the foot to do so, then peel the carpet back.
2) Remove the kickplate, and voila, there is your ECU.
3) Now grab the Fuel and Emissions section of the Factory Service Manual, get to the part of that section that talks about the Emissions Control Unit. You should find a list there that says what each pin is, whether or not it is an output/input, and what voltage it should be showing and when.
4) Also listed is a diagram saying which pin is which. Find the pins for the TPS, the AFM, the injectors, the boost sensor, the coil packs, the water thermo sensor, the crank angle position sensor, fuel pump resistor.... anything vital to the starting and running of the car.
5) turn the ignition to "on"..... do not start it, but turn it to "on" so that everything has power.
6) "backprobe" meaning insert the probe of the multimeter into the rear of the pin, while the big plugs are still connected to the ECU. Compare the voltage you read there to the values given in the FSM. To gain access to some of the pins, you may have to completely unbolt the ECU so you can maneuver it easier.
1) Get physical access to the ECU. It's located in the passenger footwell behind a metal kickplate. You are going to have to remove some plastic around the bottom of the door and the foot to do so, then peel the carpet back.
2) Remove the kickplate, and voila, there is your ECU.
3) Now grab the Fuel and Emissions section of the Factory Service Manual, get to the part of that section that talks about the Emissions Control Unit. You should find a list there that says what each pin is, whether or not it is an output/input, and what voltage it should be showing and when.
4) Also listed is a diagram saying which pin is which. Find the pins for the TPS, the AFM, the injectors, the boost sensor, the coil packs, the water thermo sensor, the crank angle position sensor, fuel pump resistor.... anything vital to the starting and running of the car.
5) turn the ignition to "on"..... do not start it, but turn it to "on" so that everything has power.
6) "backprobe" meaning insert the probe of the multimeter into the rear of the pin, while the big plugs are still connected to the ECU. Compare the voltage you read there to the values given in the FSM. To gain access to some of the pins, you may have to completely unbolt the ECU so you can maneuver it easier.
05-18-11, 11:46 PM
#23
Well, I gotta say, that every bit of this information is available here, at this exact site.... you just gotta look for it. I've been guilty of doing what you do before, and despite my high post count I have A LOT left to learn. Everything I have learned I have learned from this website.... just search my friend, you aren't the first person to have the issue you have now. The FSM is available in the FAQ in the 2nd gen section, btw.
The vast majority of people that post here or frequent this forum have been here for years, hence the attitudes you will receive. Many are veteran shade-tree mechanics that know a whole crap ton about these cars and many others and just working on cars in general. They don't respond positively to questions that have been asked over and over and over. I cut my teeth on an 89 turbo II, and really learned on a 86 n/a. I'm still learning a lot. So don't give up, keep learning; it's simply nuts, bolts and plumbing, be it electrical or of the liquid variety; it isn't rocket science. It's here, search for it and you will catch a lot less flack.
The vast majority of people that post here or frequent this forum have been here for years, hence the attitudes you will receive. Many are veteran shade-tree mechanics that know a whole crap ton about these cars and many others and just working on cars in general. They don't respond positively to questions that have been asked over and over and over. I cut my teeth on an 89 turbo II, and really learned on a 86 n/a. I'm still learning a lot. So don't give up, keep learning; it's simply nuts, bolts and plumbing, be it electrical or of the liquid variety; it isn't rocket science. It's here, search for it and you will catch a lot less flack.
05-21-11, 12:56 PM
#24
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well, i backprobed the ecu and everything is checking out according to the spec chart. i put an aftermarket fpr on and adjusted it to stock pressure. still i am getting the same feedback from my car.it will fire up when it is cold, run kinda funky, wont idle.
when i let my foot off the pedal, it stalls and will not start back up. i think my air flow meter might be bad although it is reading correctly.
when i let my foot off the pedal, it stalls and will not start back up. i think my air flow meter might be bad although it is reading correctly.