How does water in fuel effect WB?
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Joined: Feb 2010
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From: Metairie LA
How does water in fuel effect WB?
Drove the car all day Saturday and she ran like a top.
Parked until Tuesday afternoon and she would not stay running. Noticed that the WB was pegged on the lean side. Hooked up the laptop/Datamaster and finally got it to go into closed loop and it started running much better. Looked back at the replay and it was running extremely lean on the Narrow Band also until it went into closed loop. All other readings are the same as always (ie. TPS, MAF, etc)
Stopped and restarted - dead lean until closed loop but it would idle at this point. When in closed loop the NB and WB O2's appear normal.
Checked fuel pressure - 42 no vac and 37 with vac. Vacuum gauge
steady at 12 at idle. Sprayed around for vac leaks - nothing found.
At this point it was warmed up and running pretty good so I stopped for the night.
Started her up this afternoon after work and the same thing....
It has been raining here way too much and my 86 lives outside (2.5 inches on Tuesday and 3 inches today - everyday for the past two weeks). I do not have the gas tank boot so there is no standing water by the cap but it has been so wet and humid here that nothing would surprise me.
How would some water getting into the fuel affect the O2 readouts?
Thanks in advance for any input.
Parked until Tuesday afternoon and she would not stay running. Noticed that the WB was pegged on the lean side. Hooked up the laptop/Datamaster and finally got it to go into closed loop and it started running much better. Looked back at the replay and it was running extremely lean on the Narrow Band also until it went into closed loop. All other readings are the same as always (ie. TPS, MAF, etc)
Stopped and restarted - dead lean until closed loop but it would idle at this point. When in closed loop the NB and WB O2's appear normal.
Checked fuel pressure - 42 no vac and 37 with vac. Vacuum gauge
steady at 12 at idle. Sprayed around for vac leaks - nothing found.
At this point it was warmed up and running pretty good so I stopped for the night.
Started her up this afternoon after work and the same thing....
It has been raining here way too much and my 86 lives outside (2.5 inches on Tuesday and 3 inches today - everyday for the past two weeks). I do not have the gas tank boot so there is no standing water by the cap but it has been so wet and humid here that nothing would surprise me.
How would some water getting into the fuel affect the O2 readouts?
Thanks in advance for any input.
Thread Starter
Pro
Joined: Feb 2010
Posts: 677
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From: Metairie LA
According to Datamaster the temps are where they should be and the water temp is within 2 degrees of the dash gauge.
I wonder about water due to the sudden unbelievable constant rain and the sudden running like garbage. There are no codes and all sensors appear normal besides the O2's being lean on startup/open loop.
Just wondering if water would make the O2 lean?
I wonder about water due to the sudden unbelievable constant rain and the sudden running like garbage. There are no codes and all sensors appear normal besides the O2's being lean on startup/open loop.
Just wondering if water would make the O2 lean?
Thread Starter
Pro
Joined: Feb 2010
Posts: 677
Likes: 3
From: Metairie LA
That's what is perplexing me - just doesn't make sense and I am sure that it is something basic. The weather here has just been crap and trying to diagnose it between rain storms is really getting old.
Need to pull a fuel sample and see what settles out. I just rebuilt the engine and replaced all of the sensors with the exception of the IAC (and those counts are at 60 when it idles in closed loop.
Just got done going over my datalogs and comparing them with the previous ones. The only thing that stands out is the O2's.
Still think that it has something to do with the weather - water in the tank or getting on/in something that it does not agree with.
Thanks for your help.
Need to pull a fuel sample and see what settles out. I just rebuilt the engine and replaced all of the sensors with the exception of the IAC (and those counts are at 60 when it idles in closed loop.
Just got done going over my datalogs and comparing them with the previous ones. The only thing that stands out is the O2's.
Still think that it has something to do with the weather - water in the tank or getting on/in something that it does not agree with.
Thanks for your help.
