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Ford F-Series Rough Idle/Vibration Problems

136 messages,  Last post on Nov 06, 2009 at 7:23 AM

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#89 of 136 violent shaking on 05 fx4 by giturdone1 Sep 21, 2007 (8:34 pm)
have your dealer look at the emergency brake system. mine was self engaging at speeds of 45-50 mph. so far so good,
#90 of 136 non-continuous vibration in Ford F250 by jrj2 Nov 26, 2007 (2:57 pm)
I've been reading through the discussions on vibration because my Ford F250 has a similar problem. I think it may be different than those discussed because this vibration is not continuous and it is not a violent vibration. It comes and goes at random times, usually starting or stopping after I hit a bump in the road. I've taken the truck to a Ford dealership for a diagnostic, but they said everything was normal (since that diagnostic, the seals had to be replaced because they were leaking and the alternator went out). I also took it to a Firestone center and they also said that everything was normal. The vibration is increasing, but it is still not continuous. Does anyone know what this could be??? I think we would do better to just drive this truck off a cliff after all that has been replaced since it was purchased, but since I'm an optomist, I guess I'll try to fix one last thing! Oh, the truck has around 125,000 miles if that helps. Replies to this message: chip5150 (Nov 28, 2007 12:24 pm)
#91 of 136 Vibration at idle and driving by chip5150 Nov 27, 2007 (2:16 pm)
2000 F-150 4.6 V-8 120,000 miles. New brakes/rotors,ball joints,tires,u-joints,shocks,IAC valve,o2 sensors, spark plugs, all filters,rear seals, serpentine belt,fluids great,motor mounts good and tight, fuel system cleaned professionally, NO trouble codes on my scanner,runs great EXCEPT for the vibration at idle and driving. My side mirrors shake noticeably because of it. Took it back to Belle Tire to check balance and they SAID they were fine. Could it be the timing is off ? I did a vaccum check and it was GREAT. I take care of my truck and am used to being able to figure things out. I'm stuck on this one. Any ideas before I buy a timing light ? Thanks. Replies to this message: mickeymouse2 (Feb 03, 2008 10:02 am) 56prostreet (Feb 24, 2008 4:17 pm)
#92 of 136 Re: non-continuous vibration in Ford F250 [jrj2] by chip5150 Nov 28, 2007 (12:24 pm)
Replying to: jrj2 (Nov 26, 2007 2:57 pm) I am having a vibration issue also. ( see post # 91 ) I THINK my motor mounts are tight, but I could only reach 2 of the bolts. Maybe the rubber is cracked. It happens. Anyway, it may be your motor mounts causing the vibration, but how do you test those things to know for sure ? Good luck and let me (us) know if you find the cause.
#93 of 136 5.4 wont idle by heebie Dec 16, 2007 (8:41 am)
my 1999 with a 5.4 runs good but will not idle, everything is factory on this truck and problem just started.please help,thanks
#95 of 136 Re: increased noise and vibrations [ktownfootball6] by dgrasser Feb 03, 2008 (6:33 am)
Replying to: ktownfootball6 (Jul 16, 2007 9:42 am) The main exhaust pipe (there are two) probably pulled away from the exhaust manifold pipe. There are typically two bolts holding them together and they rust over time. I pulled mine back together once as it was really loud. Everything was so rusted that instead of redoing the bolts, I used a clamp to tighten it up.   W.r.t. the vibration, once the exhaust manifold separates, the O2 sensor will read high O2 in the exhaust stream (is the check engine light on) and the computer will adjust your truck to run richer. This will affect the way your truck runs.   I have been having problems with misfiring on my 1997 F150 and I believe that because of what I described above, the richer fuel mixer causes the engine to run hotter leading to other problems with plugs, spark plug wires, and/or coils (the coil over plugs have a wire inside the boot, that is the spark plug wire).   Take it to Auto Zone and they will diagnose with their reader for free.
#96 of 136 Re: Vibration at idle and driving [chip5150] by mickeymouse2 Feb 03, 2008 (10:02 am)
Replying to: chip5150 (Nov 27, 2007 2:16 pm) Skip buying a timing light, your vehicle is computer controled. The timing is decided by the PCM and is changed depending on various imputs from sensors.   Since you have this vibration at idle and driving, I would not suspect anything in the suspension, tires out of round, shocks, ect. Before I give a recomendations as to what to check for. Explain when this vibration first started, it may be related to a brand of spark plug that was installed on your tune up. Food for thought, Fords do not like champion spark plugs.   To test your motor mounts, one meathod is to have an assistant put the vehicle in drive with the brake on hard and give the engine throttle without killing it. You should view the engine twist or flex sideways no more than 2 inches. One inch is about normal. Replies to this message: 56prostreet (Feb 24, 2008 4:17 pm)
#97 of 136 Re: Vibration at idle and driving [mickeymouse2] by 56prostreet Feb 24, 2008 (4:17 pm)
Replying to: mickeymouse2 (Feb 03, 2008 10:02 am) Did you check the coils for cracks. Apparently all fords with coil-on-plug are notorious for cracking the coil cases as they age. It is recommended to replace all of the coils over 100K. I found that my E-350 began to vibrate mildly as if it had a bad driveshaft u-joint. The day after I drove in a snowstorm the vehicle began to run rougher, and sounded similar to a lawnmower while throwing no check engine light and no DTC's. The sound indicated to me to check for ignition issues. I began pulling coils and found several of the cases were cracked- I replaced the cracked ones and replaced the plugs and boots on the others. Problem solved. I should not thet there are some very good prices on ebay for the coils- about 1/5th the price of parts stores. Hope this helps.
#98 of 136 Ford F-150 Rough Idle and Smoke Problems by rene007 Apr 25, 2008 (10:31 am)
I have a 1999 F-150 with a V6 4.2 and it is throwing whiteish smoke from the tailpipe and it has a somewhat rough idle. I checked the compression and the vaccum and they are fine. I pressure checked the cooling system for a possible blown head gasket and no leaks. I checked for codes and there aren't any and the fuel trim and oxygen sensors seem to be working properly. There are no misfires detected by the PCM and the fuel inector pulsewidth seems fine. The next thing that I could think of is a bad PCM. I don't condemn it just yet since they are very expensive so I was wondering if anybody out there can give me a tips or a heads on this problem. I'd appreciate it a lot.

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