Power FC PFC failure, anyone have one like this?
06-30-04, 04:14 PM
#1
PFC failure, anyone have one like this?
93 R1, modded including PFC.
Car was running at an auto-x, car died during it's run. Car would start but not run as many times as you want to try it. Has, fuel, compression and spark.
Install stock ECU the car starts up and idles perfectly.
With PFC installed the WG and PC solenoids continuously click with the key on.
Whatcha think, PFC is toast? Repairable? Ideas/comment?
Car was running at an auto-x, car died during it's run. Car would start but not run as many times as you want to try it. Has, fuel, compression and spark.
Install stock ECU the car starts up and idles perfectly.
With PFC installed the WG and PC solenoids continuously click with the key on.
Whatcha think, PFC is toast? Repairable? Ideas/comment?
07-01-04, 06:43 AM
#4
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Jeff, Here's the link to a company that can repair the PFC if it's bad. I don't now how much they charge but....
https://www.rx7club.com/showthread.p...&highlight=PFC
https://www.rx7club.com/showthread.p...&highlight=PFC
07-01-04, 01:42 PM
#5
Rotary Enthusiast
Jeff,
I had a similar problem recently. Turned out that one of the wiring harness connectors, right after the ones that go into the ECU was slightly loose. Most of the time it would make the connection, but when it lost it, my boost display on the PFC showed ----- and I heard the same clicking in the engine bay.
The car would crank over but it died immediately.
Attila
I had a similar problem recently. Turned out that one of the wiring harness connectors, right after the ones that go into the ECU was slightly loose. Most of the time it would make the connection, but when it lost it, my boost display on the PFC showed ----- and I heard the same clicking in the engine bay.
The car would crank over but it died immediately.
Attila
07-01-04, 04:44 PM
#6
Thanks Attila!
So I reinstalled the PFC last night and it started but wouldn't run. Reinstalled the stock ECU and it would run.
I took the PFC and installed it in a 100% stock FD and guess what? It runs!
So it looks like the problem is going to be even harder to track down...
One of your wires was loose at the connector where it plugs into the PFC or somewhere else? I didn't understand the "right after" phrase. Which connector/wire?
So I reinstalled the PFC last night and it started but wouldn't run. Reinstalled the stock ECU and it would run.
I took the PFC and installed it in a 100% stock FD and guess what? It runs!
So it looks like the problem is going to be even harder to track down...
One of your wires was loose at the connector where it plugs into the PFC or somewhere else? I didn't understand the "right after" phrase. Which connector/wire?
07-01-04, 06:43 PM
#7
Rotary Enthusiast
One of the wire sets that comes off of the ecu runs right behind the ecu and has another connector.
I found out the hard way. I was driving home and all of a sudden the car is dying. The power was gone and the engine shut off. I came to a stop (from 80 to 0 on the side of the freeway).
The only symptom I had was the clicking and the PFC showed "---" for boost.
I couldn't figure it out at first but for some reason it started again. Drove it home.
I took off the kick panel, and checked the connections to the PFC. Everything was okay. I moved some of the wiring harness by accident and that's when I heard the clicking.
So I loosened the PFC from the firewall and checked all the wires. Every once in a while, not each time, I touched one set of wires, the clicking started. I traced the wires to a connector. Don't know which one, but it was behind the PFC. The connector was still engaged but the clip was not clipped. I moved the connector and the clicking started. I pluged it in properly and haven't had an issue since.
I found out the hard way. I was driving home and all of a sudden the car is dying. The power was gone and the engine shut off. I came to a stop (from 80 to 0 on the side of the freeway).
The only symptom I had was the clicking and the PFC showed "---" for boost.
I couldn't figure it out at first but for some reason it started again. Drove it home.
I took off the kick panel, and checked the connections to the PFC. Everything was okay. I moved some of the wiring harness by accident and that's when I heard the clicking.
So I loosened the PFC from the firewall and checked all the wires. Every once in a while, not each time, I touched one set of wires, the clicking started. I traced the wires to a connector. Don't know which one, but it was behind the PFC. The connector was still engaged but the clip was not clipped. I moved the connector and the clicking started. I pluged it in properly and haven't had an issue since.
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07-01-04, 08:40 PM
#8
OK, I tinkered with all the wires I could at the ECU and couldn't find a wire that would keep the WG and PC solenoids from clicking.
The car has a 3 bar MAP sensor and the stock ECU does not deal well with it (super rich) so I put in a stock MAP sensor and guess what? The car runs great with the stock ECU and runs with the PFC, super rich, but it runs.
The commander reads +1.85 kg/cm^2 with the 3 bar MAP sensor and +0.35 kg/cm^2 with the stocker. I think the PFC was getting a full boost reading so right after it started it would just kill the motor with fuel.
Houston, I think we found the problem. Oh and the WG and PC solenoid quits clicking with the other MAP sensor.
Anyone ever have a 3 Bar MAP sensor go bad?
The car has a 3 bar MAP sensor and the stock ECU does not deal well with it (super rich) so I put in a stock MAP sensor and guess what? The car runs great with the stock ECU and runs with the PFC, super rich, but it runs.
The commander reads +1.85 kg/cm^2 with the 3 bar MAP sensor and +0.35 kg/cm^2 with the stocker. I think the PFC was getting a full boost reading so right after it started it would just kill the motor with fuel.
Houston, I think we found the problem. Oh and the WG and PC solenoid quits clicking with the other MAP sensor.
Anyone ever have a 3 Bar MAP sensor go bad?
07-02-04, 12:25 AM
#9
I don't know much about the pfc yet but its possible that yours has decided to reset itself and go to the default settings for the map sensor instead of option 1 or whatever it was on.I would check the maps on it just to be safe.
Was the commander plugged in at the time when it died?could it have been moving around and pushing buttons to initialize all data?
Was the commander plugged in at the time when it died?could it have been moving around and pushing buttons to initialize all data?
07-02-04, 10:22 AM
#11
Originally posted by 2GSLSE
I don't know much about the pfc yet but its possible that yours has decided to reset itself and go to the default settings for the map sensor instead of option 1 or whatever it was on.I would check the maps on it just to be safe.
Was the commander plugged in at the time when it died?could it have been moving around and pushing buttons to initialize all data?
I don't know much about the pfc yet but its possible that yours has decided to reset itself and go to the default settings for the map sensor instead of option 1 or whatever it was on.I would check the maps on it just to be safe.
Was the commander plugged in at the time when it died?could it have been moving around and pushing buttons to initialize all data?
If it did initialize would that allow a stock ECU to run the modded car and the PFC to run a stock car?
Swapping out the 3 MAP sensor with a stocker allows the PFC to run the modded car in a similar fashion to the way the stock car ran with the PFC.
07-02-04, 11:46 PM
#12
I don't know much about setting up the pfc but on my car I have the apexi 3 bar(my stock map sensor melted in the fire) and the car would start and cut off until I switched the pim scale to option 1.
look at the commander when the car is off to see what the manifold pressure is I think mine was around -400 without the car running and when option 1 is selected it was close to 0 and the car will run.
I hope this helps but like I said I'm new to the pfc but someone knows for sure
look at the commander when the car is off to see what the manifold pressure is I think mine was around -400 without the car running and when option 1 is selected it was close to 0 and the car will run.
I hope this helps but like I said I'm new to the pfc but someone knows for sure
07-07-04, 11:59 PM
#13
Not much traffic around here....
Anyway you guys WILL NOT believe this.
So I bought a new 3 bar MAP sensor, had it shipped overnight, got it today. I plugged that sucker in and hit the key, brap, brap, brap, running on one rotor, I kept the revs up around 2-3k rpm and the other plug started to clear. Within 30 sec or so it was running smoothly on both rotors, the old MAP sensor had flooded the car to many times and fouled the plugs. I let it idle for a minute or two just to make sure it'd run.
I got in and clicked the 4-point harness on, backed out of the driveway and headed down my quiet 25mph street with this monster wearing race stickers, 315's in the rear and 275's in the front, straight exhaust with only a small excuse for a muffler on the rear, it is LOUD.
Turned left onto the 35mph street and gave it just the slightest amount of gas, MAN this thing wants to JUMP. 4.88 gears and 350rwhp will do that I guess
. I know I have to wait to warm it up before it can eat any serious boost.
I continue for a few miles and hit the 55mph expressway, I slowly turn and and get ready to feed it a little boost. Nothing, I'm rolling to a stop, the car is DEAD?!?! ****, here I am, 5:30 traffic, sitting in basically a pure race car on the side of the road...
I reach down a take a peak at the commander, 1.85kg/cm^2, welps, there goes 3 bar MAP sensor #2...
I call the wife and she comes and get me with the 2 kids, not a happy camper. I go home, grab the truck and head back out with a stock MAP sensor and ECU. I plug it in fire the car right up, runs smooth, do a left u-turn, turn left back onto the 35mph street, turn left onto my 25mph street, turn right into my slightly UPHILL driveway, BAM no PS, the car stops, front tires on the grass, rears sitting right across the sidewalk. MAP sensor #3 is toast.
OK, we definetly have a problem turning right, the car was in a right turn at an auto-x when it quit I find out later... I check a bunch of wiring down by the ECU, nothing looks obvious. I decide the older neighbors don't like walking around the back of the car so I ask the wife to help me push it up the driveway. When we push it I hear a rubbing noise in the left front tire.
I pop the tires off and guess what, the wiring harness is rubbing on the front tire, it has rubbed through the outer protective covering and is lunching on the wire insulation itself. Looking very carefully it has eaten it's way through a shielded wire, the shielding is crossing the wires that it is supposed to be sheilding, small but obvious burn marks exist.
OK this has got to be the problem, I've got one stock MAP sensor left (crossing fingers), I repair the wiring, tie wrap it up away from the tire and fire the car up. It was getting dark at this point (kids are in bed) so I decided not to take it for a drive.
I guess I'll order ANOTHER 3 BAR MAP sensor tomorrow...
Oh and then I had to get another ride to go pick up the truck, man the wife is good to me.
Anyway you guys WILL NOT believe this.
So I bought a new 3 bar MAP sensor, had it shipped overnight, got it today. I plugged that sucker in and hit the key, brap, brap, brap, running on one rotor, I kept the revs up around 2-3k rpm and the other plug started to clear. Within 30 sec or so it was running smoothly on both rotors, the old MAP sensor had flooded the car to many times and fouled the plugs. I let it idle for a minute or two just to make sure it'd run.
I got in and clicked the 4-point harness on, backed out of the driveway and headed down my quiet 25mph street with this monster wearing race stickers, 315's in the rear and 275's in the front, straight exhaust with only a small excuse for a muffler on the rear, it is LOUD.
Turned left onto the 35mph street and gave it just the slightest amount of gas, MAN this thing wants to JUMP. 4.88 gears and 350rwhp will do that I guess
. I know I have to wait to warm it up before it can eat any serious boost.I continue for a few miles and hit the 55mph expressway, I slowly turn and and get ready to feed it a little boost. Nothing, I'm rolling to a stop, the car is DEAD?!?! ****, here I am, 5:30 traffic, sitting in basically a pure race car on the side of the road...
I reach down a take a peak at the commander, 1.85kg/cm^2, welps, there goes 3 bar MAP sensor #2...
I call the wife and she comes and get me with the 2 kids, not a happy camper. I go home, grab the truck and head back out with a stock MAP sensor and ECU. I plug it in fire the car right up, runs smooth, do a left u-turn, turn left back onto the 35mph street, turn left onto my 25mph street, turn right into my slightly UPHILL driveway, BAM no PS, the car stops, front tires on the grass, rears sitting right across the sidewalk. MAP sensor #3 is toast.
OK, we definetly have a problem turning right, the car was in a right turn at an auto-x when it quit I find out later... I check a bunch of wiring down by the ECU, nothing looks obvious. I decide the older neighbors don't like walking around the back of the car so I ask the wife to help me push it up the driveway. When we push it I hear a rubbing noise in the left front tire.
I pop the tires off and guess what, the wiring harness is rubbing on the front tire, it has rubbed through the outer protective covering and is lunching on the wire insulation itself. Looking very carefully it has eaten it's way through a shielded wire, the shielding is crossing the wires that it is supposed to be sheilding, small but obvious burn marks exist.
OK this has got to be the problem, I've got one stock MAP sensor left (crossing fingers), I repair the wiring, tie wrap it up away from the tire and fire the car up. It was getting dark at this point (kids are in bed) so I decided not to take it for a drive.
I guess I'll order ANOTHER 3 BAR MAP sensor tomorrow...
Oh and then I had to get another ride to go pick up the truck, man the wife is good to me
.
07-08-04, 09:48 AM
#16
Here are a couple of pics to show what happened.
Harness:
http://community.webshots.com/photo/...60858739xPbsPW
Damaged wire:
http://community.webshots.com/photo/...60858727VfOHCj
Harness:
http://community.webshots.com/photo/...60858739xPbsPW
Damaged wire:
http://community.webshots.com/photo/...60858727VfOHCj
07-08-04, 09:36 PM
#17
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Any idea what the wire controls? Or what it was jumping too? Good detective work anyways Sherlock!
And yes, you have a keeper in your wife. Any women willing to do that twice in one day wins an award for wife of the year!
Sorry Jeff, just finished reading the other post and got the wire info. Thanks for the post. good thing to check out on all the cars that come in i think.
And yes, you have a keeper in your wife. Any women willing to do that twice in one day wins an award for wife of the year!
Sorry Jeff, just finished reading the other post and got the wire info. Thanks for the post. good thing to check out on all the cars that come in i think.
Last edited by BigIslandSevens; 07-08-04 at 09:45 PM.
oh no has Jeff caught the boost bug
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