bluesilver82

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?

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

TexasYankee

High idle on mine usually indicates a vacuum leak. I would check all your hoses and connections.

midyear1

Also check your throttle shaft bushings for wear , a common cause of vacuum leaks.

Twin_Turbo

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.

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

ACECO

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!

Marcusk408

Which sensor did you replace?

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?

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.

markdtn

One tells the computer the engine coolant temperature and it adjusts parameters based on coolant temp.

The other tells the gauge what to read.

bluesilver82

Is ther anywhere to buy an OEM part (they one that sends the signal to the ECM)? What is the part number?

pcfred

I can't get the # at this moment, maybe this evening but I just had the parts store look it up and they had it in stock. As in the pic from Ecklers you will have to splice the wires together because the connector is the newer style.

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....

pcfred

Use "both" connections. The Borg Warner connecto had a black and I believe green, I put the Black to Black and the other to the Tan wire.
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.

CraigandJanet

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.

Marcusk408

Did you have to drain all the coolant before removing the sensor?

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.

pcfred

And do it with the coolant cold.
As long as you own the '82 Twin_Turbo should be on your "best friend" list.