Help Dead Cylinders??

[Ron Rice]

Hello all, new to this site but I've had my ST for 3+ years. I have an 04 ST 152,000 miles. NEVER had a problem with her. Last week I got almost to the house when she started idling really rough. :angry: I checked this board and got lots of great info.

Things I've done:

Cleaned the IAC

Cleaned the TB

Changed plugs and wires

Although these things definately needed cleaning or changing, nothing seemed to change the idle much. A mechanic friend of mine is looking at it while I'm out of town working. He just called and told me he thinks the no. 2 and 5 cylinders are dead? He said he changed the wires with known good wires, no change. Next he plans on pulling the plugs to check the compression in those cylinders. I'm hoping for the best but I'm not optimistic at this point. Does anyone know of any other reason that both cylinders directly across from each other would do that at the same time?

Any insight into this problem is greatly appreciated. thanks

 

[Rodger Tellefson]

I just want to welcome to the site. Sorry to hear about your issue. I know others will be able to help you with your issue.

 

[Ron Rice]

Thanks for the welcome Rodger (& Georgia)! I really hope it isnt as bad as it sounds.

 

[TrainTrac]

If the wires weren't it, then it could be a bad coil pack. What are the Check Engine Light codes? You can go to AutoZone or any other auto parts store and have the OBD II codes read for free.

 

[Ron Rice]

TrainTrac- Thanks for the reply. I'm working out of town VA and the trac is in SC, I haven't gotten what the codes are from my mech friend yet, as soon as I do I'll post here and see what everyone can figure out. Would a bad coil pack cause both those cylinders to act that way? I can see one cylinder but 2 at the same time across from each other?

 

[Ron Rice]

Just got the latest. Cylinder 5 compression 150, cylinder 2 compression 0. I guess I'm screwed unless anyone has got some suggestions. Please.

 

[Wes Davis]

Is zero compression even possible? Valve stuck open or broken piston/rod? I am not a mechanic by any means.

 

[Dreman]

Broken valve spring, perhaps?

 

[Bill Barber]

Break two pistons like my kid did in his blown trac, darn right you can have 0 comp.

 

[Todd Z]

I was going to say broken valve spring, causing the valve to hit the piston..



Todd Z

 

[Bill Barber]

without question what Todd said is possible, have your guy pull the valve coveer take look see.

 

[Ron Rice]

Thanks everyone. I"ll have him take a look sometime today.