Sensor Gurus check in please
Thread Starter
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Joined: Feb 2004
Posts: 66
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From: Blue Springs MO
Sensor Gurus check in please
Hello all
I have a 1991 L-98 6 speed. Unfortunately she has caught a cold that I have yet to be able to remedy. If the car as been sitting and is completely cooled down and you fire it up it will idle alright but as soon as you goose the juice it feels like when you hit a rev limiter, the car just stops trying to accelerate and no it is no where near the rev limiter when this happens. It is as if the car does not know how to properly warm up. I checked the TPS sensor (ok) and replaced the MAP sensor neither helped. The check engine light comes on and off and if I am lucky goes off once the car has warmed up and only rarely actually runs like it used once it is warmed up. I have tried the trick where you use a jumper wire on the aldl to retrieve the codes but I never get anything. It just flashes the all ok code. The car has a brand new pcm / ecm which ever it is that houses the chip. The chip is the original however. I have put the innovate wideband kit on the car and have not reset the o2 sensor, yet I do not think that could cause this type of problem.
ALL REPLIES GREATLY APPRECIATED
I have a 1991 L-98 6 speed. Unfortunately she has caught a cold that I have yet to be able to remedy. If the car as been sitting and is completely cooled down and you fire it up it will idle alright but as soon as you goose the juice it feels like when you hit a rev limiter, the car just stops trying to accelerate and no it is no where near the rev limiter when this happens. It is as if the car does not know how to properly warm up. I checked the TPS sensor (ok) and replaced the MAP sensor neither helped. The check engine light comes on and off and if I am lucky goes off once the car has warmed up and only rarely actually runs like it used once it is warmed up. I have tried the trick where you use a jumper wire on the aldl to retrieve the codes but I never get anything. It just flashes the all ok code. The car has a brand new pcm / ecm which ever it is that houses the chip. The chip is the original however. I have put the innovate wideband kit on the car and have not reset the o2 sensor, yet I do not think that could cause this type of problem.
ALL REPLIES GREATLY APPRECIATED
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
The CTS would be a good place to start. If you could pull the codes, that would help more. The CTS is located in the front of the intake manifold. I has two wires going to the connector. On my 86, they are yellow with black stripe and black (IIRC). You can ohm the sensor hot and cold, but really won't know what the problem is with out the code.
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
Note: the coolant temp sender and CTS are two different components.
The CTS sends resistance signals to the ECM for fuel delivery, idle speed, ect. It is also where the digital coolant temp readout on the dash comes from.
Thank AGENT 86 for this link. Even though you are not getting this code, that we know of, it will show the resistance numbers at certain engine temps. If the SES light has come on, it should be stored in the (H) history.
http://members.shaw.ca/corvette86/Code%2015.pdf
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Instructor
Joined: Jul 2007
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From: Toronto Ontario
Thre are three temp sensors.
The CTS for the ECM is at the front of the engine on the passenger side head. The coolant fan switch is between #6 and #8 exhaust ports. The coolant temp sender for the dash gauge is between the #1 and #3 exhaust ports.
Race Director
Joined: Sep 2000
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From: The Top of Utah
Originally Posted by trackman44;
The CTS for the ECM is at the front of the engine on the passenger side head. The coolant fan switch is between #6 and #8 exhaust ports. The coolant temp sender for the dash gauge is between the #1 and #3 exhaust ports.
RACE ON!!!
Thread Starter
Advanced
Joined: Feb 2004
Posts: 66
Likes: 0
From: Blue Springs MO
Thanks a million for all the quick replies and the sensor info ,come to find out I was watching the engine run ,brainstorming, and happen to notice the number one spark plug wire was hopping about as the car was running instantly new that was not right, tightened the plug, problem solved. I guess that is why they are called V8's and not V7/8's.
Thanks again for the quick replies this forum and its members are TOP NOTCH!!!!!
Thanks again for the quick replies this forum and its members are TOP NOTCH!!!!!