1984 Thunderbird 5.0, motor shaking at idle,and slight miss??

Topic: 1984 Thunderbird 5.0, motor shaking at idle,and slight miss?? (Read 7138 times) previous topic - next topic

1984 Thunderbird 5.0, motor shaking at idle,and slight miss??

Reply #30 – December 11, 2015, 04:07:28 PM

I don't know where those solenoids are located on the 5.0L. On the 3.8L they are under the antifreeze expansion tank.
I think yours will be on the shock towers or the firewall. The bad solenoids don't have anything to do with your idling problem.
A bad EGO may make you run too rich as the EEC reacts to the lean EGO .
If I can find a picture I will post it.

1984 Thunderbird 5.0, motor shaking at idle,and slight miss??

Reply #31 – December 11, 2015, 04:54:41 PM

X2

Ignore the codes and solinoids right now.

Take apart your egr and see if it's stuck open, if it's not, it shouldn't be causing your idling issue.

Then you need to test your o2's by unplugging them. If unplugging them doesn't change anything, they are likely not the cause of your idle issues.

Vacuum leaks will artificially raise the idle which can cause the computer to freak out because it can't control the idle and it will do funky things like change timing and cut/add fuel trying to bring down or steady the idle. I'd check the egr/o2's, then go after vacuum lines.

Personally I've seen no difference in gas mileage or emissions with a functioning egr, so even if it is stuck open, try to clean it till it will close and make sure it seals. If it does, you don't need to worry about it unless you have emissions testing. The o2's are critical to your a/f ratio and factors how much air the computer thinks it is getting.

Your on the right track, just buckle down and check egr and o2's first. 41/42 codes should be drivers or passenger side, which should help you eliminate the problem. O2's really suck to change out. All kinds of in the way.

1984 Thunderbird 5.0, motor shaking at idle,and slight miss??

Reply #32 – December 11, 2015, 04:55:28 PM

The white/black wire on the electric choke heater should have 7 to 8 volts on it when the alternator is running.
If the alternator has been upgraded from the original 1G they may not have connected this wire to the stator (S) terminal of the alternator.
This would leave it stuck on high idle.

1984 Thunderbird 5.0, motor shaking at idle,and slight miss??

Reply #33 – December 11, 2015, 04:58:21 PM

Stack. His car only has 0ne O2.

1984 Thunderbird 5.0, motor shaking at idle,and slight miss??

Reply #34 – December 11, 2015, 06:44:58 PM

I see. Sorry, I am lacking in the cfi and pre sefi cars.

Every cfi car I had was a 87 v-6 and they all are the tranny before I got any real miles on them.