2001 Ford Focus SE Zetec DOHC Idle Rough, Erratic, & Stumbles - Page 2 - Ford Focus Forum, Ford Focus ST Forum
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Old 07-19-2012, 08:19 PM   #11
ztsmith86
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NEW UPDATE: I'm still having the same rough idle problem, but new issues have been occurring. My CEL comes on now, but registers no DTC codes when I run through the Test Mode. I went to Advanced Auto Parts and they hooked up a scanner to my car. It came up as a code that read low catalytic efficiency bank one. I unhooked my exhaust manifold, cleaned the manifold, both O2 sensors, and checked my CAT (it's in perfect condition visually) and re-assembled with new gaskets, and reset the computer. The CEL came back on a very hot day driving around town (+95 F), which is about the same conditions it came on the previous time (+100 F) day. Thanks for any help!
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Old 07-19-2012, 10:41 PM   #12
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Almost 1 month after I've put a worm gear clamp over the hose ( to prevent it from collapsing ) I never had a problem and did not get a chance to replace the hose since the car runs like a champ.
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Old 07-20-2012, 01:30 AM   #13
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zt it sounds like the heater element in your upstrean 02 shit the bed. have you changed the o2 sensor out for a new one?

also was the timing belt ever done yet? should be done every 120k on a non svt zetec iirc.
that could cause your erractic idle and power loss if the belt is all streched out. only other things is the pigtail harness for the coil pack. if one of the trigger wires (the little ones) is frayed or broken it will make the car run pretty rough
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Old 07-20-2012, 09:30 AM   #14
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You can't clean an oxygen sensor no matter how hard you try. You cannot visually determine whether a cat is good or bad either unless the core is broken or shattered. The beds can be dead and look fine. An old timing belt does not impact running of the car at all until they jump or shred, they do NOT stretch.

Instead of wasting all the time and money spent throwing parts at it why don't you get a realtime data read on what's happening there? Looking at O2 sensor readings might tell you instantly.
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Old 09-28-2012, 03:55 PM   #15
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I'm having this same issue with a 2001 zx3. Replaced PCV valve, dpfe sensor, cleaned IAC, fuel filter replaced, spark plugs, vehicle speed sensor(speedo dropout). All of this made it run better, but not well. Disconnecting the EGR system dramatically helps, but still get slightly shaky idle at around 700-800. Gonna try replacing the coil pack and wires. I would try disconnecting your EGR system and see if it helps your case(could help isolate?). Post your results if you find anything!
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Old 09-29-2012, 05:08 PM   #16
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I have had this same issue with my 2000 SE Zetec.....tried everything, replaced the motor mounts, fuel filter, pcv hose, fixed vacuum leaks, changed the pcv, changed the egr, changed the Idle Air Control Valve, cleaned the throttle body.......but finally found the problem...............the replacement motor mounts were from the local Orielly's Auto Parts and were made in China......went to our Ford Dealer, ordered the motor mount on the passenger side, transmission mount under the air box, and changed the anti roll mount underneath the steering rack......now you have to check and see if the motor is running.....it is like a different car, it used to shake so bad that the entire dash rattled, I actually wrapped the fuel pump with bubble wrap to keep it from beating against the body.
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Old 11-07-2012, 07:55 PM   #17
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Idle problem

Did you ever figure out the problem?
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Old 11-07-2012, 09:30 PM   #18
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Quote:
Originally Posted by CannondaleZx3 View Post
Did you ever figure out the problem?
Nope,still suffering through it.
Going to schedule a smoke test asap to see if its a possible vacuum leak.
Will post results.
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Old 01-06-2013, 03:49 PM   #19
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Quote:
Originally Posted by DueceCoupe View Post
Nope,still suffering through it.
Going to schedule a smoke test asap to see if its a possible vacuum leak.
Will post results.
Any answers yet?I'm having similar issues on my 01 zx3. Has new vacuum lines, egr tuned out, fuel pump issue was done in 08. Mine actually stalled out in a snow storm while cruising at 50 mph. Only showed a pats system error though switched keys and haven't had those issues since but still have the idle problem similar to yours.
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Old 01-06-2013, 06:44 PM   #20
gary the wolf
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replace the plug wires,,,l had to do that on my 2001 and 2003 focus,,,solved the prob.
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