Stalling issues - Code 31 (Camshaft Position Sensor)

[MuRCieLaGo]

OFF button doesn't fix the problem, but AUTO makes it worst.

Personal guess: could it be the battery?

[MuRCieLaGo]

Car also pulls definitely stronger when heater is at OFF position.

[MuRCieLaGo]

And another update: as soon as the RESERVE light came on, car ran like COMPLETE ****, scary. SES light came on more and more when the tank was becoming more and more empty.

Put 4 gallons of gas: no more SES and engine doesn't run like **** anymore.

Oh my god...

[MuRCieLaGo]

Fully tested the battery now.

Battery is fine.

[RICHARD TILL]

I had the very same symptoms and was getting a code 31 with the paper clip. Went thru the diagnosis with the service manual. Still could`nt locate the problem. Got a used sensor from a member who bought a new one and didn`t need it. Problem solved.

[Paul Workman]

Originally Posted by MuRCieLaGo

And another update: as soon as the RESERVE light came on, car ran like COMPLETE ****, scary. SES light came on more and more when the tank was becoming more and more empty.

Put 4 gallons of gas: no more SES and engine doesn't run like **** anymore.

Oh my god...

Not sure... Not sure if you're saying it might have been a low fuel issue all along??

Just a bit-o-info for ya:

• The fuel pumps are liquid cooled, and if allowed to 'suck air' it tends to shorten their life...significantly.
  
• It doesn't cost any more to take fuel from a full tank than it does from a near empty tank, and that way too the pumps remain submerged (and cool).
  
• AND with cold weather nearly upon us, there's less condensation (i.e., water) to mix with the fuel - and react with the alcohol (in particular).

Sounds like the previous owner left several 'gremlins' for the next guy to 'discover'. When I got my 90 it had several; mostly under the plenum. But, once cleared of all the neglected maintenance items, she's been 'running wicked' ever since!

[rkreigh]

alot of time the car sits and the fuel pumps become an issue check the fuel rail pressure tape the gauge on the hood so you can see if the FP holds as you go WOT

FSM is a must have. and scanners are nice too to monitor the fuel trims so you can see what's going on. I have EASE but it's overkill and there are much cheaper solutions.

with a bit of persistence the problem will be revealed!

the botherhood of the beast is a tight knit group and we will help you!

if anyone needs the early FSM, I have a spare set, $75 + $15 shipping and they will be at your door! just PM me.

[MuRCieLaGo]

Originally Posted by RICHARD TILL

I had the very same symptoms and was getting a code 31 with the paper clip. Went thru the diagnosis with the service manual. Still could`nt locate the problem. Got a used sensor from a member who bought a new one and didn`t need it. Problem solved.

Local electric shop tested the sensor (and I was there), and it worked perfectly.

-Connected the sensor to a 7 volts battery
-Looked at the voltage through multimeter. Showed 0 when the magnet was near metal and 7 when it was in the air.
-Initial scan showed no signal coming from the cam sensor, which makes no sense now.

Will consider a used one if I find one though and I won't put that possibility in garbage now. Thanks Richard!

Originally Posted by Paul Workman

Not sure... Not sure if you're saying it might have been a low fuel issue all along??

Just a bit-o-info for ya:

• The fuel pumps are liquid cooled, and if allowed to 'suck air' it tends to shorten their life...significantly.
  
• It doesn't cost any more to take fuel from a full tank than it does from a near empty tank, and that way too the pumps remain submerged (and cool).
  
• AND with cold weather nearly upon us, there's less condensation (i.e., water) to mix with the fuel - and react with the alcohol (in particular).

Sounds like the previous owner left several 'gremlins' for the next guy to 'discover'. When I got my 90 it had several; mostly under the plenum. But, once cleared of all the neglected maintenance items, she's been 'running wicked' ever since!

Ok I'll try to keep a full tank in the future, but at the moment I think it can be useful to locate my problem? (as it is worst when half of fuel is remaining in the tank)

No it is no a low fuel issue all along, I'm having the problem with a full tank of fuel. But like I said, it seems to be worst when the fuel is getting lower and lower.

Maybe I should have told you before that last winter, the car was left outside and it snowed on it. Water came in the fuel tank via the fuel cap and the fuel tank froze.

Originally Posted by rkreigh

alot of time the car sits and the fuel pumps become an issue check the fuel rail pressure tape the gauge on the hood so you can see if the FP holds as you go WOT

FSM is a must have. and scanners are nice too to monitor the fuel trims so you can see what's going on. I have EASE but it's overkill and there are much cheaper solutions.

with a bit of persistence the problem will be revealed!

the botherhood of the beast is a tight knit group and we will help you!

if anyone needs the early FSM, I have a spare set, $75 + $15 shipping and they will be at your door! just PM me.

Would have been a deal with me rkreigh, too bad I paid yesterday an eBay member and it's on its way now. And I simply ordered Dynomite's codes reader.

I don't really know where to tape a fuel pressure gauge, but that's the next thing I'd like to do: check fuel pumps pressure. Especially because I've red that there's only one pump where the car is cold (everything runs perfectly A1 when cold).

Can't find much on the forums, unfortunately. I feel like a student who forgot his books at home, can't wait to receive the FSM.

What are the specs for fuel pressure?

Thanks a lot, I can see this is an awesome group! I'm a member of RX7Club since 2007 and I can already tell that the Registry is way friendlier.

[We Gone]

You will find everything on the fuel system here.

http://www.zr1.net/forum/showthread.php?p=148378

[MuRCieLaGo]

Originally Posted by We Gone

You will find everything on the fuel system here.

http://www.zr1.net/forum/showthread.php?p=148378

Thanks, I'll continue my investigation...

Update:

-Fuel pumps hoses are OK.
-Just red the codes again using the paper clip - only Code 31 shows up, again.