Why is my engine light comming on and off for my '87 Chevy Caprice? - Chevy Impala Forums

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Chevy Caprice General and Technical discussion for the Chevy Caprice (1965-1996), which shares the B-Body platform with the Chevy Impala.

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Old 04-14-2008, 10:20 PM   #1 (permalink)
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Why is my engine light comming on and off for my '87 Chevy Caprice?

I have a 1987 Chevy Caprice Brougham and the service engine soon light started to come on but when you turn off the car (going in to a store etc.) an start the car again the light is out.

Why would it do that?

Also the passenger’s side mirror will go up and down but not side to side.

Answers would be greatly appreciated.

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Old 12-05-2009, 02:36 PM   #2 (permalink)
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Could be the PCV valve is bad or the vacuum hose or port is plugged. This happened to my 1990 chevy 350 TPI. The port in the throttle body was completely plugged and the service engine soon lit would come on after I drove it for a while. Usually the SES light is related to an emmision component so you should concentrate your search in those areas first.

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Old 12-05-2009, 04:12 PM   #3 (permalink)
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Your 87 is a OBD-I system. It does not store the code past when you turn off the key in most cases. It does keep coming on due to self test showing that an emission system part is out of specs. Best to find someone whom has the ability to read the OBD-I codes and have that person read the code before the car is shut off next time the light is on. Most auto parts stores only read OBD-II (96 and newer) codes. Some may have a reader that can check the older cars.

Passenger side electric mirror could either be a faulty switch, broken wire for the up/down motor, or failed motor. Testing would have to be done to track down the problem.

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1977 Chevrolet Impala Sedan, 305, TH200, 2.56:1, 106K miles, 37 Lifetime Warranty Parts.
1989 GMC C1500 Sierra ECSB 350, HM290, 3.08:1, 329K miles, 6 Lifetime Warranty Parts.

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Old 12-05-2009, 06:13 PM   #4 (permalink)
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Just now noticed that this thread is over a year and half old.:tongue: Hope he has it fixed by now.

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1977 Chevrolet Impala Sedan, 305, TH200, 2.56:1, 106K miles, 37 Lifetime Warranty Parts.
1989 GMC C1500 Sierra ECSB 350, HM290, 3.08:1, 329K miles, 6 Lifetime Warranty Parts.

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Old 12-06-2009, 07:51 AM   #5 (permalink)
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Quote:
Originally Posted by 77Impala View Post
Your 87 is a OBD-I system. It does not store the code past when you turn off the key in most cases. It does keep coming on due to self test showing that an emission system part is out of specs. Best to find someone whom has the ability to read the OBD-I codes and have that person read the code before the car is shut off next time the light is on. Most auto parts stores only read OBD-II (96 and newer) codes. Some may have a reader that can check the older cars.
Doesn't this year still respond to shorting the A and B pins together on the computer diagnostic connector under the dash and getting a flashing SES light with the stored codes? Also, I do remember that some codes are stored for a period of time after the SES turns off.

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Old 12-06-2009, 05:44 PM   #6 (permalink)
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Doesn't this year still respond to shorting the A and B pins together on the computer diagnostic connector under the dash and getting a flashing SES light with the stored codes? Also, I do remember that some codes are stored for a period of time after the SES turns off.
Yes it does. With my code reader that I use regularly I forgot that this could be done.:redface: Anyway the code reader makes the task so much simpler than having to count the flashes.

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1977 Chevrolet Impala Sedan, 305, TH200, 2.56:1, 106K miles, 37 Lifetime Warranty Parts.
1989 GMC C1500 Sierra ECSB 350, HM290, 3.08:1, 329K miles, 6 Lifetime Warranty Parts.

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