rough running

[wingtip80]

I have a 90 MTX, Today I was driving and when I shifted from forth to fith I hear a load pop from the exhaust. And then the car started to run rough. Any insight greatly appriciated.

 

[sdpatt]

Any information regarding the overall condition, parts replacements, service history and any other symptoms like noises or info on just how the rough it is running and when would be greatly appreciated. We could guess all day long, but with the minimal information you have provided, don't expect to get any detailed answers.

It could be anything from a spark plug wire cross fire to a dropped valve. More data would help narrow down the possibilities.

 

[wingtip80]

more info

Sorry over all the motor is in good shape. Although it does have 236,000
miles on it. I was planing on a 60k as soon as I could. The rpm,s at idle go back and forth from 1k to 2k. under hard acceleration it tries to go but spudders and pops.

 

[Ishodu]

Did you check to see if there were any ECC codes?

 

[wingtip80]

no how do I do that?

 

[wingtip80]

I heard that it could be the coolent sencer if so where is it?

 

[PROPHET]

no how do I do that?

Click HERE for how to.

Also pull the plug wires and check for oil on the plug wells.

Also check for vaccum leaks on intake.

 

[DHMag]

The rpm,s at idle go back and forth from 1k to 2k.

a bad negative battery contact will cause this. the computer is constantly relearning, thus causing the RPM fluctuation at idle.

 

[oh_SHO]

Could have jumped time too? I dunno, how old is the timing belt?