1991 century 3.3l misfire???

[atooshort]

okay just got the car and installed a used MAF sensor from the junkyard, put a new exhaust from catalytic converter back changed wires plugs, o2 sensor, changed a bad coil with a new one . the car runs and drives great except for on rare ocassions when i come to a stop light the car will hesitate until i come to a full stop and die!! i can start it right back up then it wil die again but after the second restart the car will go right back to running just fine except for the miss!!!! can anyone out there help me??? oh and there is no check engine light on either!!

[inafogg]

just ideas....check for vacuum leaks or cracked vacuum lines

[atooshort]

checked vacum hose no sign of bad hoses. im so frustrated because the shop i took it to told me the converter the coil pack and oxygen sensor would fix my problem but it didnt so that was a waste of 80 bucks for the shop to diagnose it with the wrong diagnosing!! !! it seems like its something stupid goin on cuz the car only has the dying problem every great once in a while and its gettin old dumping money in it i just wanna get it fixed.

[richtazz]

Look at the electrical connector for the torque converter lock-up solenoid on the trans. If it is a 4-wire square plug, unplug it and see if the stalling goes away. If it does, the TCC solenoid is bad, and is not un-locking as you slow down. If your trans has the 6-wire round plug, you cannot just unplug it, as this connector also controls the shift solenoids.

[atooshort]

ok so i got the 4 wire connector off and started the car and it seemed like it was running a lil bit better then the CEL came one so i reconnected it and it went off . i still felt like it was missing a lil bit with that solenoid unplugged. this thing is makin my head pound!!

[richtazz]

You're going to have to try driving it with that plug disconnected. The only way to know if the TCC is sticking is to warm the car up, drive it at cruising speed (45+ mph) and see if it stalls as you slow down.

[atooshort]

ok imma try driving it home with it disconnected ill post my results in about an hour after work!! this car is driving me nuts!!

[atooshort]

ok so i drove the car about 20 minutes with the tcc unplugged and no symptoms occured but like i said it is a rare problem so im still not positive! what you think??

[inafogg]

if you dont do alot of highway driving you should be ok how long usually does it take to happen

[atooshort]

it takes 1-2 days to happen!

[richtazz]

OTher than from the unplugged TCC, are you getting any trouble codes from the ECM?

[atooshort]

well the car has not died on me yet i drove it all around last night with it unplugged. there is a check engine light that pops on and off every few minutes of driving it but if i plug the tcc in the light goes away. i bought a new solenoid and side case gasket and imma install the new one hopefully tonight. the car still has a misfire to it any suggestions??

[atooshort]

ok got the solenoid in and no symptoms have occured!!!! sweet --- but the car is still running a lil ruff and i want to test the coil pack? i have a voltmeter to test them with can anyone tel me how to test them and how many ohms should be firing out of the coil?? thanks

[atooshort]

the car runs good for a minute or so when started then it starts to get rough but not bad enough to mess anything up its just annoying more than anything. can anyone help me out?

[richtazz]

Resistance of 500-1500 ohms is acceptable on the primary side (between the two spade terminals that plug into the module), and 8,000-11,000 measured between the two coil towers.

This isn't a real accurate test, unless they are way out of spec and open or dead shorted. As coils heat up, they swell internally. THis means that when cold, they will be within resistance specs, but when hot, they will short out.