Electric Fan come on when cold... SOMETIMES?
I've mentioned this before in other threads and still looking for help.
I have a 88' all stock vette with 96K miles and have been having several issues. One of them is an intermittent issue with my cooling fan which will come on when I turn the key on. Sometimes it doesn't come on right away BUT will soon after the car has started. Just to be clear, this is a totally cold car. If the car is running (still cold) and the fan comes on it willl cause a SES light to come on AND when it does the engine stumbles and SES light flickers. How does the electric fan influence engine idle??? |
Sounds like your ecm is on its last leg.
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The fan coming on is a symptom not a cause. The ECM runs the fan when a check engine light is on to keep things cool. Pull the codes and report back to us.
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Originally Posted by Benny42
(Post 1595906222)
The fan coming on is a symptom not a cause. The ECM runs the fan when a check engine light is on to keep things cool. Pull the codes and report back to us.
The last two times I took it out for a test run, I went about 10 miles, car ran fine, then SES light came on. Back at home I check codes and got code 44. (shown in another post) |
I only read this thread. I know the fan won’t cause a code 44, lean exhaust. Low fuel pressure, one or more bad injectors (likely driver side) plugged filter, failing fuel pump. Fix the root cause and the csr won’t go into limp home mode stumbling running fans.
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Originally Posted by Benny42
(Post 1595906744)
I only read this thread. I know the fan won’t cause a code 44, lean exhaust. Low fuel pressure, one or more bad injectors (likely driver side) plugged filter, failing fuel pump. Fix the root cause and the csr won’t go into limp home mode stumbling running fans.
Fuel pressure is 44 with key on but not started 39/40 at idle 52/54 at quick acceleration 36/38 when I raise the RPM and hold it there I have not got a pressure in a highway load condition. |
If you have the hvac set for defrost the ecm will run the ac compressor to dehumidify the interior of the car.If the ac compressor is engaged you probably will get a radiator fan on.
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Vacuum leaks can cause a lean condition. Has the intake been off? What shape are all the hoses and plastic vacuum lines The brake booster isn't likely to be it, you would know. New o-rings on the injectors when you swapped them? What is your idle speed? Vacuum leaks can cause it to be higher than normal.
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Originally Posted by luvmy88
(Post 1595910412)
Fuel Injectors are new, fuel filter, plugs, wires, coil all new.
Fuel pressure is 44 with key on but not started 39/40 at idle 52/54 at quick acceleration 36/38 when I raise the RPM and hold it there I have not got a pressure in a highway load condition. |
Originally Posted by luvmy88
(Post 1595905729)
I've mentioned this before in other threads and still looking for help.
I have a 88' all stock vette with 96K miles and have been having several issues. One of them is an intermittent issue with my cooling fan which will come on when I turn the key on. Sometimes it doesn't come on right away BUT will soon after the car has started. Just to be clear, this is a totally cold car. If the car is running (still cold) and the fan comes on it willl cause a SES light to come on AND when it does the engine stumbles and SES light flickers. How does the electric fan influence engine idle??? |
Originally Posted by Benny42
(Post 1595906222)
The fan coming on is a symptom not a cause. The ECM runs the fan when a check engine light is on to keep things cool. Pull the codes and report back to us.
https://cimg6.ibsrv.net/gimg/www.cor...20c4045f09.png |
Originally Posted by bjankuski
(Post 1595919672)
This is correct, the fan comes on when a trouble code is detected. The operation of the fan does not set a trouble code. you mention that the engine stumbles when this happens it seems like a MAF issue but it may not be. Listed below is some information on a code 44.
https://cimg6.ibsrv.net/gimg/www.cor...20c4045f09.png |
Originally Posted by Benny42
(Post 1595916149)
Vacuum leaks can cause a lean condition. Has the intake been off? What shape are all the hoses and plastic vacuum lines The brake booster isn't likely to be it, you would know. New o-rings on the injectors when you swapped them? What is your idle speed? Vacuum leaks can cause it to be higher than normal.
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