Check for a code 
Radiator fan on/Engine running rough
Thread Starter
Pro
Joined: Nov 1999
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From: Woodland Ca
Radiator fan on/Engine running rough
When I turn the ignition to the on position a radiator fan comes on.
I have been told that this could be the source of my engine running rough with loss of power.
Does anyone know about this?
Where is the sensor located?
If I was to disconnect the sensor, would this turn the fan off and perhaps stop the the engine from running rough?
Thanks!
I have been told that this could be the source of my engine running rough with loss of power.
Does anyone know about this?
Where is the sensor located?
If I was to disconnect the sensor, would this turn the fan off and perhaps stop the the engine from running rough?
Thanks!
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by BIG K
If I was to disconnect the sensor, would this turn the fan off and perhaps stop the the engine from running rough?
Thanks!
Thanks!
RACE ON!!!
Team Owner
Joined: Jan 2003
Posts: 20,306
Likes: 242
From: Summerland B.C. Canada
Thread Starter
Pro
Joined: Nov 1999
Posts: 659
Likes: 0
From: Woodland Ca
MikeC4, temp range was normal.
AGENT 86, there is no code. I used a jumper and retrived the computer codes and all I go was 12's.
Also, your PDF is for a '86 no? Would it also apply to my '89? I'm not finding that page with a non scan diagnostic circuit check in my 1989 GM manual. I do appreciate the extra help though!
What's the "limp home mode", and where should I start looking?
It was once running rough and it turned out to be the MAF.
What do I need to do to check it to see if it's good?
Thanks again!
AGENT 86, there is no code. I used a jumper and retrived the computer codes and all I go was 12's.
Also, your PDF is for a '86 no? Would it also apply to my '89? I'm not finding that page with a non scan diagnostic circuit check in my 1989 GM manual. I do appreciate the extra help though!
What's the "limp home mode", and where should I start looking?
It was once running rough and it turned out to be the MAF.
What do I need to do to check it to see if it's good?
Thanks again!
Last edited by BIG K; Dec 13, 2005 at 04:31 PM.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by BIG K
What's the "limp home mode", and where should I start looking?
Originally Posted by BIG K
It was once running rough and it turned out to be the MAF.
What do I need to do to check it to see if it's good?
Thanks again!
What do I need to do to check it to see if it's good?
Thanks again!
RACE ON!!!
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Thread Starter
Pro
Joined: Nov 1999
Posts: 659
Likes: 0
From: Woodland Ca
Originally Posted by artvette
Fix the problem.
Last night I disconnected the ECM. The fan still ran when the ignition key was in the on position engine off. Last I disconnected the fan relay switch. This did turn the fan off. So I replaced the aux fan relay switch. Fan still runs.
Now, I have a code 15. So what I'm wondering. If I replace the coolant temp sensor, would this be enough to take it out of the limp home mode and take care of the code 15?
Thanks
Instructor
Joined: Dec 2005
Posts: 197
Likes: 0
From: Woodland California
I have an 86. It threw a maff code while I was running a Hypertech chip. I replaced the maff. It then threw a prom code. I put the stoch prom back in, and all was OK. I then put the original maff back on, and it runs fine with no codes for past two months. Go figure.
Instructor
Joined: Dec 2005
Posts: 197
Likes: 0
From: Woodland California
I have an 86. It threw a maff code while I was running a Hypertech chip. I replaced the maff. It then threw a prom code. I put the stoch prom back in, and all was OK. I then put the original maff back on, and it runs fine with no codes for past two months. Go figure. I would consider replacing the prom if there are no codes (about $100)
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by BIG K
Last night I disconnected the ECM. The fan still ran when the ignition key was in the on position engine off. Last I disconnected the fan relay switch. This did turn the fan off. So I replaced the aux fan relay switch. Fan still runs.
Originally Posted by BIG K
Now, I have a code 15. So what I'm wondering. If I replace the coolant temp sensor, would this be enough to take it out of the limp home mode and take care of the code 15?
Thanks
Thanks
RACE ON!!!
Pro
Joined: Nov 2004
Posts: 641
Likes: 3
From: Long Island NY
Originally Posted by CFI-EFI
That is what happens when you throw money at the problem, instead of testing components.
It might. Maybe it would pay to TEST the sensor, instead of throwing more money at it. Don't shoot the messenger...Troubleshoot.
RACE ON!!!
It might. Maybe it would pay to TEST the sensor, instead of throwing more money at it. Don't shoot the messenger...Troubleshoot.
RACE ON!!!
Thread Starter
Pro
Joined: Nov 1999
Posts: 659
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From: Woodland Ca
Thanks for trying to help and fix the problem instead of being cridtical. We all have to learn.
Does anyone have any ideas that could help me?
I already picked up a coolant temp sensor ($10.00). It came with a connector too. I'm going to see what happens with replacing them today and move on.
Again that's for your time and patience this time of the year!
Does anyone have any ideas that could help me?
I already picked up a coolant temp sensor ($10.00). It came with a connector too. I'm going to see what happens with replacing them today and move on.
Again that's for your time and patience this time of the year!
Le Mans Master
Joined: Oct 2003
Posts: 6,130
Likes: 2
From: seattle WA
A friend had a slight hick up in his without any codes-it took him 2 years before he traced it to the temp sensor-he reasoned that the ECM corrected for it b4 it could throw a code-now he's happy.But he never said anything about the fan comming on imediately.
Last edited by rick lambert; Dec 16, 2005 at 10:00 AM.