Check Engine Light

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shearhawk

Active member
Joined
Apr 4, 2006
Posts
39
I have a 91 Coachmen with Chevy 454.  The check engine light came on our last trip.  Running rich when on cold start, then seems to run fine after warm up.  But warm start up, it idles real high till we are in motion.  (Fuel injected throttle body) Anybody have this problem and what was the cure.  Tried to find the connector for the decoder, but can not find.  Any help here would be great also.

Thanks,
Randall hawkins
 

Shayne

Well-known member
Joined
Jan 22, 2006
Posts
4,324
Not saying this is a definite analysis,  but I had the same thing occur on the Ford chassis.  At that age of unit check the EGR valve,  Oxygen senor, or most likely a vaccuum leak that is hard to detect. Often it's the vaccum line attached to the tranny, usually has fluid in it.  Best I can often without checking it out.  Sometimes they are a devil to find. Need a vaccuum tester to find the smallest of leaks.  Also make sure the sensor on the Air Intake is not clogged.  Good Luck
 

Woody

Well-known member
Joined
Mar 10, 2005
Posts
917
shearhawk said:
I have a 91 Coachmen with Chevy 454.? The check engine light came on our last trip.? Running rich when on cold start, then seems to run fine after warm up.? But warm start up, it idles real high till we are in motion.? (Fuel injected throttle body) Anybody have this problem and what was the cure.? Tried to find the connector for the decoder, but can not find.? Any help here would be great also.

Thanks,
Randall hawkins

I think its the nature of the old throttle body carbs on the 454 to run fast upon cold startup. My 93 Pace Arrow with 454 tb does that also. If it doesn't revert to slow idle after warmup I just "pop" the accelerator with my foot and it slows down. Haven't had the check engine light come on though. Many auto supply stores will have the codes.

Woody
 

93winnvectra

Member
Joined
Jul 7, 2006
Posts
5
youre plug for reading error codes should be near or on the steering column. The good news is that it is a OBD I system which means you dont need a fancy code reader for it. Just get a paper clip and connect the A and B connectors together and watch the code flash. It should start with a 12 code. Then followed by the error  code or codes youre looking for. http://www.chevythunder.com/Flow%20chart%20index.htm heres a list of error codes for you to relate too. It is a 12 pin plug, with Letters stamped at each pin location A,B,C ect.. 6 on one side 6 on the other. Hope this helps

Rich
 

John From Detroit

Well-known member
Joined
Apr 12, 2005
Posts
26,096
Location
Davison Michigan
93winnvectra said:
youre plug for reading error codes should be near or on the steering column. The good news is that it is a OBD I system which means you dont need a fancy code reader for it. Just get a paper clip and connect the A and B connectors together and watch the code flash. It should start with a 12 code. Then followed by the error  code or codes youre looking for. http://www.chevythunder.com/Flow%20chart%20index.htm heres a list of error codes for you to relate too. It is a 12 pin plug, with Letters stamped at each pin location A,B,C ect.. 6 on one side 6 on the other. Hope this helps

Rich

Thanks... I knew the paper clip for my 1992, but the URL will be very helpful, Very helpful indeed
 
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