82 vette (crossfire) Idles rough
Thread Starter
Burning Brakes
Joined: Jan 2006
Posts: 1,154
Likes: 1
From: St Augustine FL
82 vette (crossfire) Idles rough
Marck this may be for you. The car idles rough so bad that the car shakes a little. I can tell it is running rich from the smell of the exhaust fumes. I think that the Idle air motors probably need to be replaced. One maybe not functioning correctly so the other maybe over compenstating. (my guess) Is there any special trick for testing and/or replacing these? What else would make the car Idle rough and at high RPM (1,200 in park or nuetral)? Would the throotle position sensor affect this? If so, how do you adjust them?
Instructor
Joined: Feb 2005
Posts: 224
Likes: 0
From: Boston Massachusetts
Hi,
I'm not that knowledgeable about the workings of the crossfire, but in my case, replacing the temp sensor that sends signals to the ECM helped. The sensor is located near the water pump and is easy to replace. When the engine reaches operating temp, the ECM leans out the fuel mixture. If you are not getting a good signal from the temp. sensor, the ECM will run the motor too rich.
My 82 ran better with the new sensor.
Good luck,
Tom
I'm not that knowledgeable about the workings of the crossfire, but in my case, replacing the temp sensor that sends signals to the ECM helped. The sensor is located near the water pump and is easy to replace. When the engine reaches operating temp, the ECM leans out the fuel mixture. If you are not getting a good signal from the temp. sensor, the ECM will run the motor too rich.
My 82 ran better with the new sensor.
Good luck,
Tom
Race Director
Joined: Dec 1999
Posts: 16,945
Likes: 9
yup, good suggestions above. Common causes are indeed dirty IACs, worn throttle bodies (shafts) common vac. leaks, poor atomization (check spray aptterns), coolant temp sender but also TPS pos (you can adjust it to 0,52 V +/- 0,025) but you need to use a splice connector or rig it up yourself. The connector can be bought from all the vendors. Plugs, wires, aircleaners...all will help some.
Safety Car
Joined: Jan 2004
Posts: 4,776
Likes: 142
From: North of Atlanta GA
St. Jude Donor '05
Originally Posted by Toms82
Hi,
I'm not that knowledgeable about the workings of the crossfire, but in my case, replacing the temp sensor that sends signals to the ECM helped. The sensor is located near the water pump and is easy to replace. When the engine reaches operating temp, the ECM leans out the fuel mixture. If you are not getting a good signal from the temp. sensor, the ECM will run the motor too rich.
My 82 ran better with the new sensor.
Good luck,
Tom
I'm not that knowledgeable about the workings of the crossfire, but in my case, replacing the temp sensor that sends signals to the ECM helped. The sensor is located near the water pump and is easy to replace. When the engine reaches operating temp, the ECM leans out the fuel mixture. If you are not getting a good signal from the temp. sensor, the ECM will run the motor too rich.
My 82 ran better with the new sensor.
Good luck,
Tom
I've had a "ping under acceleration" problem for a year now with my '82, and after reading your post on Thursday I bought a new temp sensor (Borg-Warner), installed it last night, drove the car today and NO MORE PING!!! I owe you big time! This was driving me nuts, I've changed the egr, new computer, played with the timing, and chased a few other issues trying to solve my ping problem, all things helped overall performance but it was still there and your suggestion of replacing the temp sensor was right on the money!!! I can't thank you enough
Drifting
Joined: Nov 2003
Posts: 1,634
Likes: 4
From: Northern NJ
St. Jude Donor '04 & '05
Also check all the bolts holding the top of the intake manifold on. On my 84, most of these were finger loose causing vacuum leaks and many of the symptons you describe.
Good Luck!
Good Luck!
Racer
Joined: Nov 2005
Posts: 339
Likes: 0
From: San Jose CA
Originally Posted by pcfred
NO MORE PING
I've had a "ping under acceleration" problem for a year now with my '82, and after reading your post on Thursday I bought a new temp sensor (Borg-Warner), installed it last night, drove the car today and NO MORE PING!!! I owe you big time! This was driving me nuts, I've changed the egr, new computer, played with the timing, and chased a few other issues trying to solve my ping problem, all things helped overall performance but it was still there and your suggestion of replacing the temp sensor was right on the money!!! I can't thank you enough
I've had a "ping under acceleration" problem for a year now with my '82, and after reading your post on Thursday I bought a new temp sensor (Borg-Warner), installed it last night, drove the car today and NO MORE PING!!! I owe you big time! This was driving me nuts, I've changed the egr, new computer, played with the timing, and chased a few other issues trying to solve my ping problem, all things helped overall performance but it was still there and your suggestion of replacing the temp sensor was right on the money!!! I can't thank you enough
Was it like this one?---http://www.parts123.com/parts123/yb....Z5Z5Z50000050G
Or this one...http://www.parts123.com/parts123/yb....Z5Z5Z50000050G
Anyone know the difference between the two sensors in the links? Isn't there just one coolant temp sensor? What's the difference between the ECM coolant sensor and engine coolant sensor?
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Safety Car
Joined: Jan 2004
Posts: 4,776
Likes: 142
From: North of Atlanta GA
St. Jude Donor '05
Originally Posted by Marcusk408
Which sensor did you replace?
Was it like this one?---http://www.parts123.com/parts123/yb....Z5Z5Z50000050G
[/URL]
Anyone know the difference between the two sensors in the links? Isn't there just one coolant temp sensor? What's the difference between the ECM coolant sensor and engine coolant sensor?
Was it like this one?---http://www.parts123.com/parts123/yb....Z5Z5Z50000050G
[/URL]
Anyone know the difference between the two sensors in the links? Isn't there just one coolant temp sensor? What's the difference between the ECM coolant sensor and engine coolant sensor?
Le Mans Master
Joined: Aug 2003
Posts: 7,720
Likes: 12
From: Chattanooga TN
Originally Posted by Marcusk408
Anyone know the difference between the two sensors in the links? Isn't there just one coolant temp sensor? What's the difference between the ECM coolant sensor and engine coolant sensor?
The other tells the gauge what to read.
Thread Starter
Burning Brakes
Joined: Jan 2006
Posts: 1,154
Likes: 1
From: St Augustine FL
Originally Posted by pcfred
It was like the first one, is located at the front of the engine just below the smog pump. It sends signals to the ECM, made a huge difference in mine, I paid around $17 @ Pep Boys for one made by Borg Warner, they usually make very good replacement parts. The other I believe is just for temp gauge.
Is ther anywhere to buy an OEM part (they one that sends the signal to the ECM)? What is the part number?
Safety Car
Joined: Jan 2004
Posts: 4,776
Likes: 142
From: North of Atlanta GA
St. Jude Donor '05
Originally Posted by bluesilver82
Is ther anywhere to buy an OEM part (they one that sends the signal to the ECM)? What is the part number?
Le Mans Master
Joined: Apr 2001
Posts: 5,000
Likes: 1
From: Minneapolis, Mn USA
How did you make the electrical connections?
There is a black and yellow wire coming to the original . Did you use them both or did you take the ground from the engine block somewhere?
I have the same wire + connector CTS and am going to install it soon. PS I also have noticed the pinging on acceleration. Hope this will fix it.
Brent....
There is a black and yellow wire coming to the original . Did you use them both or did you take the ground from the engine block somewhere?
I have the same wire + connector CTS and am going to install it soon. PS I also have noticed the pinging on acceleration. Hope this will fix it.
Brent....
Safety Car
Joined: Jan 2004
Posts: 4,776
Likes: 142
From: North of Atlanta GA
St. Jude Donor '05
Originally Posted by MN-Brent
How did you make the electrical connections?
There is a black and yellow wire coming to the original . Did you use them both or did you take the ground from the engine block somewhere?
I have the same wire + connector CTS and am going to install it soon. PS I also have noticed the pinging on acceleration. Hope this will fix it.
Brent....
There is a black and yellow wire coming to the original . Did you use them both or did you take the ground from the engine block somewhere?
I have the same wire + connector CTS and am going to install it soon. PS I also have noticed the pinging on acceleration. Hope this will fix it.
Brent....
Pinging could be due to a number of things, bad computer, bad ECM Temp sensor, bad ECM, vacuum leak, EGR valve, O2 sensor.
I'd start with the ecm temp sensor, check/replace ALL vacuum hoses, if that doesn't cure it I'd check/replace the O2 sensor and check/clean the EGR valve, if it persists I'd look into whether the computer is working, "Twin_Turbo" did a writeup on how to test the ECM, search the forum.
Racer
Joined: Aug 2005
Posts: 255
Likes: 0
From: Mason MI 82-93-04CE
Originally Posted by TexasYankee
High idle on mine usually indicates a vacuum leak. I would check all your hoses and connections.
Check the simple stuff first. My idle was high but went back to normal after tightening the intake manifold, etc. back to specs. Then it went way bad with high idle and rough running, just awful, when we were on a road trip. Ended up being the cruise control vacuum line split right where it goes into the manifold. I cut off the bad end, stuck it back on, and life is good
I find 90 percent of the time it is something simple and not a sensor or something more complicated. Good Luck and have fun.
Racer
Joined: Nov 2005
Posts: 339
Likes: 0
From: San Jose CA
Originally Posted by pcfred
It was like the first one, is located at the front of the engine just below the smog pump. It sends signals to the ECM, made a huge difference in mine, I paid around $17 @ Pep Boys for one made by Borg Warner, they usually make very good replacement parts. The other I believe is just for temp gauge.
Safety Car
Joined: Jan 2004
Posts: 4,776
Likes: 142
From: North of Atlanta GA
St. Jude Donor '05
Originally Posted by Twin_Turbo
no, it will only spill a little if you are fast so keep the new one in reach when unscrewing the old one.
And do it with the coolant cold.As long as you own the '82 Twin_Turbo should be on your "best friend" list.
Last edited by pcfred; Aug 11, 2006 at 11:18 AM.
